JP2019069894A - Fine aggregate, pumice, volcanic glass material, mixed cement and perlite - Google Patents

Abstract

To provide a dry process separation method for volcanic ejecta deposit mineral, which can facilitate improving the conventional particle size regulation method of normal Shirasu and increase the yield of fine aggregate with density of 2.5 g/cmor more.SOLUTION: An air flow classifier comprises: a cyclone classifier group for recovering coarse grains, which removes a gravel fraction with a grain diameter above 5 mm from volcanic ejecta deposit minerals, makes the remainder transported by room temperature or high temperature air flow, and includes at least two cyclone classifiers connected to a cycling air flow path; a cyclone classifier for recovering fine grains, which is coupled to the cyclone classifier group; and a bag filter for recovering fine powder, which is coupled to the cyclone classifier. Using the air flow classifier, the coarse grains are recovered by the cyclone classifier group for recovering coarse grains; the fine grains are recovered by the cyclone classifier for recovering fine grains; the fine powder is recovered by the bag filter for recovering fine powder; and thereby fine aggregates are recovered from recovered coarse grains.SELECTED DRAWING: Figure 1

Description

  The present invention relates to fine aggregates, pumice, volcanic glass, mixed cement and perlite separated by a dry separation method of dry separating volcanic ejecta sediment minerals, such as ordinary shirasu.

  Conventionally, natural sand such as river sand and sea sand has been used as fine aggregate for concrete, but river sand has been depleted as a result of many years of irregular digging, and extraction of sea sand is an environment The collection is limited because it leads to destruction, and there is a situation where it is necessary to rely on imports for a part. In West Japan, where sea sand is highly dependent, it is particularly serious, and obtaining raw materials to replace natural sand has become an urgent issue.

  By the way, Shirasu is a kind of volcanic sediment sedimentary mineral widely distributed in southern Kyushu, and it is a resource that can be obtained in large quantities, so if it could be used as an aggregate for concrete, it would replace natural sand. obtain. In particular, non-salt sand such as river sand contributes to prolonging the life of concrete, particularly reinforced concrete, so it has higher added value than sea sand where the inclusion of salinity can not be avoided, but river sand sampling requires freshwater organisms and aquatic plants. Cause the destruction of ecosystems, etc., and the environmental load is large. Since Shirasu is a pyroclastic flow deposit about 30,000 years ago on land and is salt-free, fine aggregate removed from Shirasu has high added value as non-salt sand.

  The largest problem in the case of using ordinary shirasu, that is, the silus plateau of southern Kyushu as fine aggregate for concrete, and using natural and unworked shirasu According to the construction manual for concrete that uses as a fine aggregate (draft) (issued in 2006), the shirasu contains a very large amount of fine particles. The content of fine particles having a particle size of 0.150 mm or less in ordinary shirasu is in the range of 20 to 40%, and is about 30% on average, which is abnormally higher than natural sand. The large amount of fine particles is derived from the fact that, unlike river sand that has been flooded with water, shiras are usually large pyroclastic flow deposits that are not flooded with water. In the case of ordinary sand, the content of particles with a particle size of 0.150 mm or less should be 10% or less, and the content should be 15% or less for crushed sand and blast-furnace slag crushed sand according to the "Concrete Standard Specification" of the Japan Society of Civil Engineers Because it is said that it is possible, ordinary shirasu can not be used for ordinary sand as it is. If a fine aggregate containing a large amount of fine particles having a particle size of 0.150 mm or less is used, the flowability of fresh concrete that has not solidified yet is impeded, leading to an increase in unit water content. For this reason, it is necessary to remove fine particles having a particle size of 0.150 mm or less, preferably to 15% or less, preferably at least 15% or less, which is the same as crushed sand, but the removal is expensive and expensive. It has never been possible to achieve this.

  That is, there are dry sieving method and wet sieving method to remove fine particles having a particle size of 0.150 mm or less from shirasu, but if the former is carried out with shirasu being undried, the contained moisture adheres to the particles. The fine particles may coagulate or adhere to the coarse particles while adhering to the screen of the sieve, and the sieve may Clogging occurs and removal of fine particles becomes impossible. Therefore, although it is necessary to dry prior to sieving, it involves a great deal of energy consumption and requires a long processing time, which is a major obstacle to practical use. Also, the latter wet sieving method has the same disadvantages as the former because it requires the use of a large amount of water and the need for drying after sizing.

  Another problem in sizing shiras is the disposal of the removed fine particles having a particle size of 0.150 mm or less, that is, unnecessary residues. According to JIS-A 1204 “Grade size test method of soil”, the particle diameter 2 to 4.75 mm is fine, the particle diameter 0.850 to 2 mm is coarse sand, the particle diameter 0.250 to 0.850 is medium sand The particle size of 0.075-0.250 mm is defined as fine sand, the particle size of 0.005-0.075 mm as silt, and the particle size of 0.005 mm or less as clay. Therefore, the fine particles having a particle size of 0.150 mm or less have a wide particle size distribution, and a part of the fine sand, the silt and the clay are mixed, the added value is low, and the use thereof is absent. Among the silt and clay fractions, especially the clay fraction is hard to settle in water because the particles are so fine that it can not flow into the river or the sea as it is turbid. It is necessary to dispose of the material that has been increased and separated by sedimentation, and the disposal cost can not be ignored. In addition, since drainage of the supernatant is also mixed with the coagulant component, discharging to the natural environment is not preferable from the environmental viewpoint as well. Once the clay, silt and clay aggregates that have been soaked in water solidify in the drying process, and when used they are dispersed into single particles, even if you want to disperse them into single particles. Because it is difficult, even if it is used for admixtures etc., the aggregation structure disturbs and it is difficult to express pozzolanic effect which may have originally. Furthermore, when the component of a coagulant | flocculant is mixed, the effect as an admixture reduces.

  It is referred to as “graining” to adjust to the desired particle size, but usually, when the grain is sized and divided into two based on the particle size of 0.150 mm as described above, one of them is useful as a product, Unnecessary remainders will be generated, and the cost of disposal will be passed on to products, which will be disadvantageous in price competition. Further, if the number of divisions by grain size reduction is small, the grain size width will naturally be wide, and the added value will be low.

  Therefore, with the exception of the very small amount of resources such as Yoshida Shirasu and Kakuto Shirasu, which have a very small amount of resources that are finely grained due to natural flooding with water, with the exception of ordinary Shirasu that forms the Shirasu plateau, industrially At present, it is impossible to achieve profitability if the particle size is adjusted.

  With regard to the method of sizing regular shirasu, combining the first to fourth cyclones with a bag filter, fine aggregate in the first cyclone, coarse sand and medium sand in the second cyclone, medium sand in the third cyclone There is a method of respectively collecting fine sand, fine sand and silt in the fourth cyclone, and clay in the bag filter (Patent Document 1).

JP 2010-269951 A (claims and others)

According to the particle sizing method described in Patent Document 1, it is possible to use volcanic deposit sediment minerals without drying the raw material shirasu or product accompanied by consumption of a large amount of thermal energy, and performing the water scale treatment using a large amount of water. It is possible to mass-produce high value-added granules having desired particle sizes simply and efficiently in many types at the same time. However, the fine aggregate collected from the ordinary shirasu as a raw material in the first cyclone as it is has a low yield of those with a density of 2.5 g / cm ³ or more as defined in “sand” of JIS A5308, and enhances the yield. In order to achieve this, further improvements have been sought.

The present invention is intended to improve the conventional regular shirasu sizing method and to increase the yield of fine aggregate having a density of 2.5 g / cm ³ or more. Aims to provide fine aggregate, pumice and volcanic glass material, mixed cement and perlite obtained by the method.

The present inventors removed a fraction having a particle diameter of 5 mm or more from a volcanic ejecta sediment mineral, for example, ordinary shirasu, and then dry-separated by a specific air flow classification device, a specific gravity difference selection device or a device combining both. By doing this, it was found that the yield of fine aggregate having a density of 2.5 g / cm ³ or more can be increased, and the present invention has been made based on this finding.

According to one aspect of the present invention, there is provided at least two cyclone classifiers connected to a circulating air flow path for removing debris having a particle size of more than 5 mm from a volcanic deposit sediment mineral and transferring the remainder to a room temperature or high temperature air stream. An air flow classification apparatus comprising: a group of cyclone classifiers for collecting coarse particles having the following; a cyclone classifier for collecting fine particles connected to the cyclone classifier; and a bag filter for collecting fine powder connected to the cyclone classifier The coarse particles are collected by the cyclone classifier group for coarse particle collection, the fine particles are collected by the cyclone classifier for fine particle collection, and the fine powder is collected by the bag filter for fine powder collection,
It is a dry separation method of volcanic product sedimentary mineral, characterized in that fine aggregate is recovered from the recovered coarse particles.

  In the above invention, it is preferable that the upper part of the cyclone classifier in the group of cyclone classifiers for collecting coarse particles has a conical shape, and the top of the conical shape is connected to the pipeline, and the coarse particles are also coarse particles. It is preferable to have a cyclone crusher upstream of the collection of cyclone classifiers.

Another aspect of the present invention is directed to a porous plate from below while vibrating a porous plate having a particle diameter of more than 5 mm removed from a volcanic deposit sediment mineral and the remaining portion inclined at a predetermined angle from the horizontal direction. It is supplied to an air table type specific gravity difference sorting device that blows air and sorted into a heavy specific gravity component, a light specific gravity component, a dust collection component, and a porous plate drop component,
It is a dry separation method of volcanic product sedimentary mineral, characterized in that fine aggregate is recovered from the selected heavy specific gravity.
In the above invention, the fine aggregate can be recovered not only from the sorted heavy specific gravity component but also from the porous plate drop.

In the above invention, the porous plate falling portion sorted by the air table type specific gravity difference sorting device is supplied to the same or another air table type specific gravity difference sorting device with different working conditions, and the heavy specific gravity portion and the light specific gravity are It is preferable that the fine aggregate be further collected from the heavy specific gravity that has been further sorted by sorting into a fraction, a dust collection fraction, and a perforated plate drop fraction.
In the above-mentioned invention using a plurality of specific gravity difference sorting devices, fine aggregate can be recovered not only from the heavy specific gravity fraction further sorted but also from the sorted porous plate drop.
Further, in the above invention using a plurality of specific gravity difference sorting devices, the specific gravity difference sorting device on the downstream side sorts the porous plate falling component into heavy specific gravity component, light specific gravity component and dust collection component without sorting It can also be done.
In the above invention using a plurality of specific gravity difference sorting devices, the light specific gravity components sorted by the specific gravity difference sorting device on the upstream side are supplied to the specific gravity difference sorting device on the downstream side. Further, it is possible to further sort the dust collection portion and the porous plate drop portion and collect pumice for lightweight aggregate from the sorted light specific gravity, and in this case, the specific gravity difference sorting device on the downstream side is porous. The heavy specific gravity, the light specific gravity, and the dust collection can be sorted without sorting the falling part of the board, and pumice stone for lightweight aggregate can be recovered from the sorted light specific gravity.
Furthermore, in the above invention using a plurality of specific gravity difference sorting devices, the dust collected by the upstream specific gravity difference sorting device is supplied to the downstream specific gravity difference sorting device, and the heavy specific gravity component and the light specific gravity component are The volcanic glass material can be recovered from the collected dust by further sorting the collected dust and the perforated plate, and in this case, in the downstream specific gravity difference sorting device, the perforated plate falling portion The volcanic glass material can also be recovered from the sorted dust by sorting the heavy specific gravity, the light specific gravity, and the dust, without sorting.

Another aspect of the present invention is the removal of particulates having a particle size of more than 5 mm from volcanic ejecta sediment mineral, with the remainder being transported to a stream of normal temperature or high temperature, and at least two cyclone classifications connected to circulating air flow path. Type having a cyclone classifier for collecting coarse particles having a collector, a cyclone classifier for collecting fine granules connected to the cyclone classifier, and a bag filter for collecting fine powders connected to the cyclone classifier Using the device, coarse particles are collected by a cyclone classifier for collecting coarse particles, fine particles are collected by a cyclone classifier for fine particle collection, and fine powder is collected by a bag filter for fine powder collection,
The coarse particles collected are supplied to an air table type specific gravity difference sorting device which blows air from below to the porous plate while vibrating the porous plate inclined at a predetermined angle from the horizontal direction, and the heavy specific gravity component and light weight Sorting into specific gravity, dust, and perforated plate,
It is a dry separation method of volcanic product sedimentary mineral, characterized in that fine aggregate is recovered from the selected heavy specific gravity.
In the above invention, the fine aggregate can be recovered not only from the sorted heavy specific gravity component but also from the porous plate drop.

  In the above invention, it is preferable that the upper part of the cyclone classifier in the group of cyclone classifiers for collecting coarse particles has a conical shape, and the top of this conical shape be connected to the pipeline, for collecting coarse particles It is preferable to have a cyclone crusher on the upstream side of a group of cyclone classifiers, and for the porous plate falling portion sorted by an air table type specific gravity difference sorting device, the specific gravity of the same or different air table type under different operating conditions It is preferable to supply to the difference sorting apparatus to further sort the heavy specific gravity component, the light specific gravity component, the dust collection component, and the porous plate falling component, and to further collect fine aggregate from the sorted heavy specific gravity component. .

The particle size of the coarse particles recovered in the above-mentioned invention provided with the above-mentioned pneumatic classification device is 0.30 to 5 mm, the particle size of fine particles is 0.05 to 0.30 mm, and the particle size of fine powder is 0.05 mm It is preferable that it is the following.
In the above-mentioned invention provided with the above-mentioned specific gravity difference sorting device, it is preferable to sort the heavy specific gravity component at a density of 2.5 g / cm ³ or more and sort less than that as the light specific gravity component.
In the above-mentioned invention provided with at least one of the above-mentioned airflow classification device and the above-mentioned specific gravity difference sorting device, it is preferable to classify at least one of a light specific gravity part and fine particles into a sieve top and a sieve bottom. The sieve can be recovered as a lightweight aggregate, and particularly when the volcanic ejecta deposit mineral is shirasu, at least one of the light specific gravity portion and the fine particles is sieved and the sieve is used as a pearlite raw material or a shirasu balloon raw material It is preferable to recover. The mesh of the sieve used for this sieving is preferably 75 μm or more.

  One aspect of the present invention is a group of cyclone classifiers for coarse particle recovery having at least two cyclone classifiers connected to a circulating air flow path, and a cyclone classifier for fine particles recovery connected to the cyclone classifiers. It is a dry separation device of a volcanic ejecta deposit mineral, characterized by comprising: an air flow classification device having a machine and a bag filter for collecting fine powder connected to the cyclone classification device.

In the above invention, it is preferable that the upper part of the cyclone classifier in the group of cyclone classifiers for collecting coarse particles has a conical shape, and the top of this conical shape be connected to the pipeline, for collecting coarse particles It is preferable to have a cyclone crusher on the upstream side of the group of cyclone classifiers, and at least one of the cyclone classifier and one of the cyclone classifiers for collection of fine particles in the group of cyclone classifiers for collecting coarse particles is It is preferable to have an adjustment means, and adjust the air flow rise speed by this intake adjustment means.
In the above invention, it is preferable to further include one or more air table type specific gravity difference sorting devices for blowing air toward the porous plate from below while vibrating the porous plate inclined at a predetermined angle from the horizontal direction.
Further, in the air table type specific gravity difference sorting apparatus, it is preferable to select the heavy specific gravity component to have a density of 2.5 g / cm ³ or more and to select less than that as the light specific gravity component.
Furthermore, at least one of the light specific gravity component and the fine particles can be sieved with a particle size of 0.3 mm, and the sieve top can be recovered as a lightweight aggregate. When the volcanic ejecta deposit mineral is shirasu, it can be sieved to recover under sieving as a perlite (JIS A 5007 equivalent) raw material or a shirasu balloon raw material or an admixture raw material. The mesh of the sieve used for this sieving is preferably 75 μm or more.

One aspect of the present invention is a fine aggregate obtained by the method for dry separation of volcanic product sediment mineral according to the present invention.
One aspect of the present invention is a residual volcanic glass material obtained by separating fine aggregate by the dry separation method of volcanic ejecta sediment mineral according to the present invention, and separated to a particle diameter of 0.3 mm or more It is a pumice stone for lightweight aggregate made of volcanic glass material.

One aspect of the present invention is a residual volcanic glass material obtained by separating fine aggregate by the dry separation method of volcanic ejecta sediment mineral according to the present invention, and separated to a particle size of less than 0.05 mm. It is a volcanic glass material. The volcanic glass material separated to less than 0.05 mm in particle diameter can be used as an additive having a pozzolanic effect. In addition, a volcano not crushed is crushed by crushing at least one of a volcanic glass material having a particle diameter of less than 0.05 mm, a volcanic glass material having a diameter of 0.05 mm to 0.3 mm, and a pumice of 0.3 mm or more volcanic glass. An admixture having a pozzolanic effect superior to that of a glass material can be obtained.
In addition, Portland cement can be mixed with at least one of the remaining volcanic glass material and the crushed volcanic glass material to make a mixed cement having a pozzolanic effect.

  One aspect of the present invention is a residual volcanic glass material obtained by separating fine aggregate by the dry separation method of volcanic ejecta sediment mineral according to the present invention, which has a separated particle diameter of 0.05 mm or more It is pearlite obtained by firing and expanding a volcanic glass material as it is or after grinding it.

  According to the present invention, for example, by separating the ordinary shirasu by dry separation, the heavy specific gravity component is used as the fine aggregate, the light specific gravity component and the fine particle sieve are used as the lightweight aggregate, and the light specific gravity component and fine particle sieve are used. It is possible to collect fine powder as perlite, perlite raw material or shirasu balloon raw material, fine powder as admixture raw material or admixture having pozzolanic effect or mixed cement raw material having pozzolanic effect, respectively, which have high added value, and ordinary shirasu is effective Utilization is planned. In other words, according to the present invention, fine aggregate, lightweight aggregate, perlite, perlite raw material or shirasu balloon raw material, admixture raw material or pozzolanic effect is obtained by dry separation of volcanic ejecta sedimentary mineral such as ordinary shirasu And a mixed cement raw material having a pozzolanic effect or a admixture having a P.

According to the present invention, the yield of fine aggregate having a density of 2.5 g / cm ³ or more can be increased as compared with the conventional particle sizing method, and a large amount of raw material is processed to obtain the desired particle size and density There is an effect that a high-quality recovered material can be obtained in various types.

It is the schematic of an example of the dry separation apparatus which enforces the dry separation method of the reference example 1. FIG. FIG. 6 is a schematic view showing an example of a dry separation apparatus suitable for use in the dry separation method of Reference Example 2; It is a modification of FIG. It is a modification of FIG. It is an example of the combination of the modification of FIG. 3 and the modification of FIG. It is the schematic which shows an example of the dry separation apparatus used for the dry separation method of this invention. It is a schematic diagram explaining the principle of a specific gravity difference sorting device. It is a modification of FIG. It is the schematic which shows an example of the dry separation apparatus used for the dry separation method of this invention. It is a modification of FIG. It is the schematic which shows an example of the dry separation apparatus used for the dry separation method of this invention. It is the schematic which shows an example of the dry separation apparatus used for the dry separation method of this invention. It is the schematic which shows an example of the dry separation apparatus used for the dry separation method of this invention. 15 is a graph showing the particle size distribution of the heavy specific gravity obtained by Example 3. FIG. It is a graph which shows the compressive strength of Examples 4-9 with a comparative example.

  Hereinafter, according to the drawings, embodiments of the method for dry separation of volcanic product deposit mineral of the present invention, dry separation device, fine aggregate and volcanic glass material are used as raw materials for ordinary shirasu which is a kind of volcanic product deposit mineral An example will be described.

(Embodiment 1)
One embodiment of the method and apparatus for dry separation of volcanic product deposit mineral of the present invention will be described.
FIG. 1 is a schematic view showing an example of a dry separation apparatus suitable for use in the dry separation method of the present invention.
The dry separation device shown in FIG. 1 includes an air flow classification device 10. This air flow classification device 10 includes cyclone classification machine groups 12 to 14 for coarse particle collection, a cyclone classification machine 15 for fine particle collection, and a bag filter 16 for fine powder collection connected to the cyclone classifier. There is.

  In the illustrated dry separation apparatus, ordinary shirasu is supplied from the belt feeder 3 to the sieve 4, and fractions having a particle size of more than 5 mm are removed by the sieve 4 as a sieve, and the remainder is under the sieve to the airstream classifier 10. Supplied. In the illustrated example, the sieve 4 is used to remove the fraction having a particle size of more than 5 mm, but instead of the sieve 4, it is also possible to use a machine that grinds the particle size of ordinary shirasu as a raw material to 5 mm or less it can. In addition, there is also an advantage that the inside of the pumice usually contained in the shirasu is exposed and the whiteness of the separated and recovered pumice products is improved by crushing using a machine for crushing to 5 mm or less. The small pumice and volcanic glass particles from which the crushed pumice has been recovered have exposed the glass surface inside the pumice particles, and they are equivalent to foamed pumice manufactured by firing and expansion foaming, and pearlite of about 0.15 mm or more The whiteness of the product or Shirasu balloon of approximately 0.15 mm or less has the advantage that the whiteness is higher than that of pumice that has not been subjected to the crushing process, foamed pumice originating from volcanic glass particles, pearlite equivalent products, or Shirasu balloon equivalents. is there.

  The air flow classification device 10 includes a plurality of cyclone crushers 11A, 11B, 11C, a plurality of cyclone classifiers 12 to 15, and a bag filter 16, and pipes 17A to 17I connecting these.

  In the air flow classification device 10, ordinary shirasu classified with a particle size of 5 mm or less classified under a sieve is first led to the cyclone crusher 11A, from the cyclone crusher 11A to the cyclone crusher 11B via the pipe line 17A From crusher 11B, it leads to cyclone crusher 11C via line 17B. At the inlet of the cyclone crusher 11A, suction force to the pipelines 17A to 17I caused by the exhaust blower 18 works, and a large amount of intake air G is taken from the inlet of the square pipe installed at the outermost periphery of the cyclone crusher 11A. When it is introduced to form a downward spiral swirling flow and the shirashi raw material is dropped from above with a small amount of intake air, the aggregates are dispersed according to the spiral downward flow of air flow and the pipe inner wall is As it is traced, it is sent to the next cyclone crusher 11B, which makes it possible to smoothly feed a large amount of raw materials without clogging. The main energy required for transportation and drying of raw materials, single particle formation, and separation is powered by the suction power of the exhaust blower 18, and it is a linear combination of paths while making it compact by combining a cyclone crusher and a cyclone classifier three-dimensionally. It has a structure that maximizes the moving distance of the raw material particles over a distance, and the contact between the raw material and the air is increased, so that it is possible to efficiently express airflow drying and particle single particle formation.

  The cyclone crushers 11A to 11C are generally cyclones for dispersing the aggregation of shirasu grains by centrifugal force. The common shirasu dispersed through the cyclone crusher 11A to 11C is led to the cyclone classifier 12 through the pipe line 17C. In the cyclone crusher passing through 11A to 11C and the pipe line connecting them, collision, friction, contact or collision of these particles with each other, friction, or contact of the attached particles or aggregated particles to the inner wall surface or inner wall of the cyclone crusher Forced action promotes exfoliation and dissociation of fine particles and fine powder attached to coarse particles, dissociation and disaggregation of aggregates, and water attached to particles and water present between particles to air by contact with air Move and dry the particles. Therefore, when the raw ordinary silus contains water of about 4 percent or more, the dry separation apparatus of the present embodiment having the cyclone crusher 11A to 11C and dried in the cyclone crusher 11A to 11C is used. Is preferred.

  The synergetic effect of separation, crushing and drying by the cyclone crusher 11A to 11C promotes single particle formation of coarse particles, fine particles and fine particles. The cyclone classifier 12 connected to the cyclone crusher 11C classifies ordinary shirasu into coarse particles and other than coarse particles. In order to promote single particle formation of coarse particles, fine particles and fine particles, as shown in FIG. 3 and FIG. 5, a total of four, five or more cyclone crushers may be provided.

  The coarse particles are collected by the cyclone classifier 12 from the pipeline connected to the lower side of the cyclone classifier 12. The coarse particles have a particle diameter of 0.30 to 5 mm, and are supplied to the specific gravity difference sorting device 21 described later via the belt feeder 5. When the sorting ability of the specific gravity difference sorting device 21 is large compared to the amount of coarse particles collected by the cyclone classifier 12, the coarse particles by the cyclone classifier 12 are temporarily stored and supplied to the specific gravity difference sorting device 21 in a batch mode. it can. In addition, value 0.30-5 mm of the particle size of the coarse particle classified by the cyclone classifier 12 is a rough value. Further, as described later, the value of the particle size of coarse particles or the recovery rate can be adjusted by adjusting the size of the opening 12a provided in the lower pipe line of the cyclone classifier 12 as intake adjustment means. .

The upper portion of the cyclone classifier 12 has a conical shape and is connected to the conduit 17D at the top of the conical shape. The upper part of the cyclone classifier 12 has a conical shape, so that the swirling air flow rising upward from the cyclone classifier 12 is smoothed, and coarse particles of a predetermined particle size are made below the cyclone classifier 12. Drops having a particle size smaller than that of the coarse particles are carried by the air flow rising upward from the cyclone classifier 12 and conveyed to the conduit 17D.
The conduit connected to the lower side of the cyclone classifier 12 is provided with an opening 12 a. The opening 12a is an intake adjustment means, and by adjusting the size of the opening 12a, it is possible to adjust the flow rate of the updraft in the conduit provided with the opening 12a. More specifically, the opening 12a is enlarged to increase the flow velocity of the rising air flowing from the lower side to the upper side of the cyclone classifier 12, thereby improving the ratio of the density of 2.5 g / cm ³ or more in the coarse particles. be able to. The opening 12a is, for example, a gap between the flange joints, and the amount of air of the intake air H taken in from the opening 12a is adjusted by adjusting the distance of the gap with a washer or the like having different thickness. It is possible to adjust the flow rate of the rising air flowing from the lower side to the upper side.
The pipeline connected to the lower side of the cyclone classifier 12 has two on-off valves 12 b below the opening 12 a. During operation of the illustrated dry separation apparatus, coarse particles accumulate in the pipeline connecting below the cyclone classifier 12. In order to recover the coarse particles during the operation, first, the upper on-off valve 12b is opened and the lower on-off valve 12b is closed, whereby the coarse particles are separated between the upper on-off valve 12b and the lower on-off valve 12b. Then, the upper on-off valve 12b is closed and the lower on-off valve 12b is opened, thereby collecting coarse particles between the upper on-off valve 12b and the lower on-off valve 12b. Here, instead of the on-off valve 12b, a rotary valve having the same function can be used.

  In order to increase the yield of single-particle coarse particles, a cyclone classifier 13 and a conduit 17D and a conduit 17E are provided, and the overflow of the cyclone classifier 12 is transferred to the cyclone classifier 13 via the conduit 17D. The first circulation path is formed to lead the underflow portion of the cyclone classifier 13 to the cyclone classifier 12 through a conduit 17E connected to the conduit 17C. In addition, in order to further increase the yield of single-particle coarse particles, a cyclone classifier 14 and a conduit 17F and a conduit 17G are provided, and the overflow of the cyclone classifier 13 is classified via a cyclone 17F. A second circulation path is formed which leads to the machine 14 and leads the underflow portion of the cyclone classifier 14 to the cyclone classifier 13 via a conduit 17G connected to the conduit 17D. By circulating in the circulation path of these air flows, collision, friction, contact, collision between these particles, friction, contact acts forcibly on the inner wall surface or the inner wall of the cyclone classification machine of attached particles or aggregated particles, The separation of fine particles and fine powder attached to the coarse particles and the crush of the aggregates are promoted, and the water attached to the particles and the water present between the particles move to the air by contact with the air, and the particles are dried. move on. The synergetic effect of these exfoliation, crushing, and drying promotes the formation of single particles of coarse particles, fine particles and fine particles. Due to the above effects, ordinary shirasu is reduced in water content and dried even if it is an air flow at normal temperature in the pipeline and in the cyclone classifier. If the intake air G introduced into the cyclone crusher 11A is dry air or warm air, drying and single particle formation of shirasu are further promoted.

  In the present embodiment shown in FIG. 1, the cyclone classifier 13 and the cyclone classifier 14 are provided to form two circulation paths, but three, four or more circulation paths are formed. For that purpose, as shown in FIG. 4 and FIG. 5, a total of three or four or more cyclone classifiers may be provided.

  The overflow of the cyclone classifier 14 is led to the cyclone classifier 15 via the pipe line 17H. The cyclone classifier 15 classifies the overflow of the cyclone classifier 14 into fine particles and fine particles other than fine particles. The fine particles have a particle size of 0.05 to 0.30 mm and are supplied to the sieve described later. In addition, the value 0.05 to 0.30 mm of the particle diameter of the fine particles classified by the cyclone classifier 15 is an approximate value. Further, by adjusting the size of the opening 15a provided in the lower conduit of the cyclone classifier 15 as the intake adjustment means, the value of the particle diameter of fine particles or the recovery rate can be adjusted.

  The pipeline connected to the lower side of the cyclone classifier 15 is provided with an opening 15 a. The opening 15a is an intake adjusting means, and by adjusting the size of the opening 15a, it is possible to adjust the flow velocity of the updraft in the conduit provided with the opening 15a, and hence the particle size distribution or average particle diameter of the fine particles. Or the recovery rate can be adjusted. The opening 15a is, for example, a gap of a flange joint, and the amount of air of the intake air I taken in from the opening 15a is adjusted by adjusting the distance of the gap with a washer or the like having a different thickness. The flow rate of the upward air flow can be adjusted.

  In a pipeline connected to the lower side of the cyclone classifier 15, two on-off valves 15b are provided below the opening 15a. During operation of the illustrated dry separation apparatus, fines are deposited in the pipeline connecting below the cyclone classifier 15. In order to recover the fine grains during work, first, the upper on-off valve 15b is opened and the lower on-off valve 15b is closed, whereby the fine grains are placed between the upper on-off valve 15b and the lower on-off valve 15b. Then, the upper on-off valve 15b is closed and the lower on-off valve 15b is opened, whereby fine particles between the upper on-off valve 15b and the lower on-off valve 15b are recovered. Here, instead of the on-off valve 15b, a rotary valve having the same function can be used.

  The recovered fine particles are sieved by a sieve 19. The mesh of the sieve is 300 μm, and fine particles having a particle diameter of 0.3 mm or more are separated on the sieve, and fine particles having a particle diameter of 0.3 mm or less are separated on the sieve. The fine particles classified as the underflow component of the cyclone classifier 15 are mainly volcanic glass and contain pumice with a particle diameter of 0.3 mm or more. The pumice having a particle size of 0.3 mm or more is useful as a lightweight aggregate. Therefore, lightweight aggregate can be recovered by screening with a sieve 19 with a particle size of 0.3 mm.

  Further, under the sieve 19 is a volcanic glass material having a particle size of less than 0.3 mm. In particular, when the volcanic ejecta deposit mineral is shirasu as in the present embodiment, the volcanic glass material having a particle size of less than 0.3 mm is foamed by heating, and thus is useful as a pearlite raw material or a shirasu balloon raw material. Moreover, it can be used as an admixture by grinding a volcanic glass material having a particle size of less than 0.3 mm. In the dry separation method of the present embodiment, fine powder having a particle size of 0.05 mm or less is classified as an overflow of the cyclone classifier 15, so that the lower part of the sieve 19 hardly contains fine powder. Therefore, the lower part of the sieve 19 can obtain the volcanic glass material B2 having a particle diameter of about 0.05 mm to 0.3 mm and a uniform particle diameter.

  As an overflow portion of the cyclone classifier 15, fine powder other than fine particles is led to the bag filter 16 via the pipe line 17I. The bag filter 16 recovers the fine powder C. The fine powder C has a particle size of 0.05 mm or less. In addition, the value of 0.05 mm or less of the particle size of the fine powder C is a rough value. The fine powder C is mainly made of volcanic glass and is useful as a mixed cement raw material having pozzolanic effect, more specifically, as an additive or a raw material thereof. Here, the portion of the bag filter 16 functions similarly even if it is replaced with an electrostatic precipitator.

An exhaust blower 18 is connected to the bag filter 16, and the air flow passing through the filter cloth of the bag filter 16 is discharged by the exhaust blower 18. The cyclone crushers 11A, 11B and 11C and the cyclone classifiers 12 to 15 are driven by the exhaust blower 18, and the carrier air flow is discharged from the exhaust blower 18 to the outside.
According to the dry separation method and dry separation apparatus of the present embodiment shown in FIG. 1, ordinary shirasu can be separated into coarse particles A, fine particles B and fine particles C, and further fine particles B have a particle diameter of 0. It can be separated into 3 mm or more (B1) and a particle diameter of 0.3 mm or less (B2). Since fine aggregate having a density of 2.5 g / cm ³ or more is contained in the coarse particles A, the yield of fine aggregate having a density of 2.5 g / cm ³ or more can be increased by recovering the coarse particles A. be able to.

Second Embodiment
Another embodiment of the method and apparatus for dry separation of volcanic product sediment mineral is described.
FIG. 2 is a schematic view showing an example of a dry separation apparatus suitable for use in the dry separation method of the present invention. In FIG. 2, the same members as those in FIG. 1 are denoted by the same reference numerals. Therefore, in the present embodiment, redundant description of the same members as those described above in the first embodiment will be omitted. Also, instead of the sieve 4 shown in the figure, it is possible to use a machine for grinding the particle size of the ordinary shirasu, which is a raw material, to 5 mm or less.

  The dry separator shown in FIG. 2 differs from the dry separator shown in FIG. 1 in that it has a rotary feeder 20 for supplying ordinary shirasu to the cyclone classifiers 12 to 14 for coarse particle recovery. It is. When the water content of the raw ordinary shirasu is less than about 4 percent, it circulates smoothly through the cyclone classifiers 12 to 14 for coarse particle recovery without drying via the cyclone crusher 11A to 11C. It can be made to dry in the process of circulating in the cyclone classification machine groups 12-14 for coarse particle collection. Therefore, ordinary shirasu is supplied to the top of the cyclone classifier 13 by the rotary feeder 20 which can supply quantitatively.

  The rotary feeder 20 has a high sealing property and can quantitatively supply shirasu raw materials without the need for air conveyance. The ordinary shirasu fed from the rotary feeder 20 to the upper part of the cyclone classifier 13 is fed to the cyclone classifier 14 by the air flow from the pipe line 17F. The fine powder which has been made into single particles by centrifugation in the cyclone classifier 14 is conveyed to the upper conduit 17H as an overflow component. The fine particles and the fine powder can not be separated, and the coarse particles or aggregates to which they are attached are centrifuged in the cyclone classifier 13 through the conduit 17D together with the crushed single particles. In the cyclone classifier 13, coarse particles dropped downward are introduced from the intake port of the cyclone crusher 11A and come into contact with the air stream flowing through the cyclone crushers 11A to 11C, and pass through the conduit 17C to the cyclone classifier. Sent to 12 After that, the fine aggregate is separated from the cyclone classifier 12 by repeating crushing and separation of ordinary shirasu in the pipeline by the circulation route system of the cyclone classifier as described in the first embodiment.

  The supply of common shirasu is not limited to the rotary feeder 20 when the water content of the common common shirasu is less than about 4 percent. A part or all of ordinary shirasu can also be passed through the cyclone crusher groups 11A to 11C. Moreover, when the water content of the raw ordinary shirasu is about 4% or more, the ordinary shirasu is not limited to passing through the cyclone classifiers 12-14. A portion of the common shirasu can also be supplied from the rotary feeder 20.

  According to the dry separation method and dry separation apparatus of the present embodiment shown in FIG. 2, the ordinary shirasu is classified into coarse particles, fine particles, and fine powder as in the dry separation method and dry separation device of the first embodiment shown in FIG. 1. And the fine grains can be further separated into a particle size of more than 0.3 mm and a particle size of 0.3 mm or less.

  FIG. 3 is a modification of FIG. 1 and is an example in which the cyclone crusher is a total of five cyclone crushers 11A, 11B, 11C, 11D and 11E. As can be seen from FIGS. 1 and 3, in the dry separation apparatus of the present invention, the number of cyclone crushers is not limited.

  FIG. 4 is a modification of FIG. 2 and is an example having a total of five cyclone classifiers, that is, cyclone classifiers 12, 13, 14, 31 and 32. As can be seen from FIGS. 2 and 4, in the dry separation apparatus of the present invention, the number of cyclone classifiers may be two or more.

  FIG. 5 is an example of a combination of the modification of FIG. 3 and the modification of FIG. 4 and has a cyclone crusher having a total of five cyclone crushers 11A, 11B, 11C, 11D and 11E, and the cyclone classification The machine is an example having a total of five cyclone classifiers 12, 13, 14, 31 and 32.

(Embodiment 3)
An embodiment of the method for dry separation of volcanic product deposit mineral of the present invention will be described.
FIG. 6 is a schematic view showing an example of a dry separation apparatus used in the dry separation method of the present invention. In FIG. 6, the same members as those described above with reference to the drawings are given the same reference numerals, and duplicate explanations will be omitted below.

  The dry type separation apparatus shown in FIG. 6 is provided with an air table type specific gravity difference sorting apparatus 21. The specific gravity difference sorting device 21 has a porous plate 21a and a vibrating device 21g, and the porous plate 21a inclined at a predetermined angle from the horizontal direction is vibrated by the vibrating device 21g toward the porous plate 21a from below while the wind tunnel 21h. It is an air table type specific gravity difference sorting device which blows air by the inner blowing fan 21b. The principle of the specific gravity difference sorting device 21 will be described with reference to a schematic view shown in FIG.

  The porous plate 21a is inclined at a predetermined angle from the horizontal direction. Further, the upper surface of the porous plate 21a has a sawtooth-like unevenness in cross section, and the height difference of the unevenness is approximately 3 to 10 mm. The porous plate 21a has a large number of holes of a predetermined shape. The perforated plate 21a is capable of a unique vibration movement of ± 3 to 7 mm with a unique longitudinal length such that it can be withdrawn immediately after being delivered from the lower side to the upper side in the form of a cycloid or similar curve by a vibrating device 21g with an eccentric crank. It is possible to apply a force to push upward the heavy specific gravity that has been caught in the serrated recess. While vibrating the porous plate 21a by the vibrating device 21g, air can be blown by the blower fan 21b in the wind tunnel 21h toward the hole of the porous plate 21a. When a mixture of multiple specific gravity powders is supplied to the upper surface of the porous plate 21a, the heavy powder with heavy specific gravity (shown by black circles in FIG. 7) and the sawtooth unevenness on the upper surface of the porous plate 21a are caught by the vibrating device 21g. The vibration of the porous plate 21a moves toward the upper side of the porous plate 21a. The powder with a low specific gravity soars by the air flow through the holes of the porous plate 21a. Among the light powders with specific gravity that are blown up, powder with relatively high specific gravity (indicated by white circles in FIG. 7) moves toward the lower part of the porous plate 21a. Among the light-weight specific powder that has been blown up, powder having a relatively low specific gravity (indicated by the middle point in FIG. 7) is carried outside the specific gravity difference sorting device 21 on the air flow.

  Therefore, by supplying ordinary shirasu to the specific gravity difference sorting device 21 and blowing air toward the porous plate 21a from below while vibrating the porous plate 21a, the heavy specific gravity component on the upper side of the porous plate 21a, The light weight can be sorted out. Further, among the ordinary shirasu supplied to the porous plate 21a, one having a smaller particle size (hereinafter referred to as "dust collection portion") floats from the porous plate 21a by air flow. Further, part of the ordinary shirasu supplied to the porous plate 21a falls through the holes of the porous plate 21a.

The operation conditions are set so that the porous plate 21a is sorted out as a heavy specific gravity component among the ordinary shiras having a density of 2.5 g / cm ³ or more. Setting of working conditions, for example, raw material supply amount per hour, air blowing amount, inclination angle of porous plate 21a, size of holes of porous plate 21a, shape of holes, number of holes, shape of irregularities of porous plate, porous plate The adjustment is performed by adjusting at least one of the vibration number 21a, the amount of air to be discharged and the like according to the discharge port 21e.

The heavy specific gravity components sorted by the porous plate 21 a are discharged from the discharge port 21 c of the specific gravity difference sorting device 21 and collected. The heavy specific gravity component recovered is a density of 2.5 g / cm ³ or more. The heavy specific gravity component satisfies a density of 2.5 g / cm ³ or more specified by “sand” of JIS A5308, and can be used as a fine aggregate as it is.

The porous plate drops sorted by the porous plate 21a are discharged from the discharge port 21f and collected. The collected porous plate drop can be made to have a density of 2.5 g / cm ³ or more depending on the raw material and the working conditions. The porous plate falling portion can be used as a fine aggregate as it is when the density of 2.5 g / cm ³ or more specified by “sand” of JIS A5308 is satisfied.

When the density of the porous plate sorted by the porous plate 21a is 2.5 g / cm ³ or less, it can not be used as a fine aggregate specified by “sand” of JIS A5308. In this case, as will be described later, it is possible to carry out specific gravity separation of the perforated plate by the specific gravity difference selector (see FIGS. 9 and 10).

  The light specific gravity component sorted by the porous plate 21 a is discharged from the discharge port 21 d of the specific gravity difference sorting device 21. The discharged low specific gravity component is applied to a sieve 23 described later via the belt conveyor 6 and the belt feeder 9.

  The dust collected from the perforated plate 21 a is guided to the cyclone classifier 22 through a conduit 7 A connected to the outlet 21 e of the specific gravity difference sorting device 21. The cyclone classifier 22 classifies more lightweight fine powder as the overflow component from the dust collection. The cyclone collection of the underflow is collected as a shirasu balloon raw material or an admixture raw material. Further, the fine powder of the overflow of the cyclone classifier 22 is led to the bag filter 16 through the pipe line 7I and collected. The bug filter 16 is as described above.

  The sieve 23 has a predetermined mesh size. The mesh of the sieve 23 can be, for example, 300 μm. The light specific gravity component of the specific gravity difference sorting device 21 is introduced to the sieve 23 and divided into a sieve top and a sieve bottom.

  The light specific gravity component of the specific gravity difference sorting device 21 contains pumice having a particle diameter of 0.3 mm or more. The pumice having a particle size of 0.3 mm or more is useful as a lightweight aggregate. Therefore, lightweight aggregate can be recovered by screening with a sieve 23 with a particle size of 0.3 mm.

  Further, under the sieve 23 is a volcanic glass material having a particle size of less than 0.3 mm. In particular, when the volcanic ejecta deposit mineral is shirasu as in the present embodiment, the volcanic glass material having a particle size of less than 0.3 mm is foamed by heating, and thus is useful as a pearlite raw material or a shirasu balloon raw material. In the dry separation method of the present embodiment, fine powder having a particle diameter of 0.05 mm or less is classified in advance by the specific gravity difference sorting device 21. Therefore, the lower part of the sieve 23 hardly contains the fine powder. Therefore, the lower part of the sieve 23 can obtain a shirasu balloon raw material having good foamability.

In utilizing the volcanic glass having a particle size of less than 0.3 mm in the light specific gravity part of the specific gravity difference sorting device 21, it is not always necessary to use the sieve 23. FIG. 8 is a modification of FIG. The dry separation apparatus shown in FIG. 8 does not have the sieve 23.
As shown in FIG. 8, even if the light specific gravity component does not sift with a particle diameter of 0.3 mm by the sieve 23, the sieve 23 is omitted if it conforms to the standard of JIS A5002 “Lightweight concrete aggregate for structure”. Can be simplified to recover lightweight aggregate.

According to the dry separation method of this embodiment shown in FIG. 6 and FIG. 8, the ordinary shirasu can be separated into the heavy specific gravity component D and the light specific gravity component E into the fine powder F using the specific gravity difference sorting device 21. Furthermore, the light specific gravity component can be separated by the sieve 23 into, for example, a particle diameter of over 0.3 mm (E1) and a particle diameter of 0.3 mm or less (E2). Since fine aggregate having a density of 2.5 g / cm ³ or more is contained in the heavy specific gravity component D, the yield of fine aggregate having a density of 2.5 g / cm ³ or more can be obtained by recovering the heavy specific gravity component D. Can be enhanced.

  The dry separation method and the dry separation apparatus of the present embodiment do not have the cyclone crusher and the cyclone classifier used in the dry separation method of the first embodiment and the second embodiment, and therefore the raw materials by the cyclone crusher and the cyclone classifier I can not expect to dry. However, before separating the raw material with sieve 4, the forced drying with a dryer spends a great deal of cost, and even if it does not dry the moisture content to less than approximately 2%, it is spread several centimeters indoors into which sunlight penetrates Allow the raw material to be dried to some extent by another economical drying method, such as leaving it for several days and leaving it to dry at regular intervals, to reduce the moisture content of ordinary shirasu to about 2% or less By doing this, the dry separation method and dry separation apparatus of the present embodiment can be implemented efficiently. Although the dry separation method and dry separation apparatus of the present embodiment can be carried out even when the water content of the raw ordinary shirasu exceeds 2%, the separation can be carried out compared to the sufficiently dried ordinary shirasu raw material. The efficiency is reduced, and the higher the moisture content of the raw ordinary shirasu, the lower their separation efficiency.

(Embodiment 4)
One embodiment of the method for dry separation of volcanic product deposit mineral of the present invention will be described with reference to FIG.
FIG. 9 is a schematic view showing an example of a dry separation apparatus used in the dry separation method of the present invention. In FIG. 9, the same members as those described above with reference to the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

  The dry type separation apparatus shown in FIG. 9 is provided with a total of two specific gravity difference selection apparatuses of the first stage air table type specific gravity difference selection apparatus 21A and the second stage air table type specific gravity difference selection apparatus 21B. The first stage specific gravity difference sorting apparatus 21A can have the same structure and operation conditions as the specific gravity difference sorting apparatus 21 described in the third embodiment.

The coarse particles dropped through the holes of the porous plate 21a of the first stage specific gravity difference sorting device 21A are controlled in particle diameter to be equal to or less than the pore diameter, but heavy specific gravity including heavy mineral having a density of 2.5 g / cm ³ or more In many cases, the main component is min, and contains volcanic glass and some pumice and fine powder, so the density may be 2.5 g / cm ³ or less depending on the raw material and separation conditions.
In this case, in order to sort heavy minerals having a density of 2.5 g / cm ³ or more from this porous plate drop, specific gravity is sorted on the second stage air table.

The perforated plate falling portion dropped from the porous plate 21a of the first stage specific gravity difference sorting apparatus 21A is supplied to the second stage specific gravity difference sorting apparatus 21B via the belt feeder 8 and sorted. The porous plate 21a of the second stage specific gravity difference sorting apparatus 21B sets the operation conditions so as to sort out the normal shiras having a density of 2.5 g / cm ³ or more as the heavy specific gravity component. However, the working condition can be made different from that of the first stage specific gravity difference sorting apparatus 21A in the second stage specific gravity difference sorting apparatus 21B. For example, the raw material supply amount per hour, the air blowing amount, the inclination angle of the porous plate 21a, the size of the holes of the porous plate 21a, the shape of the holes, the number of holes, the shape of the irregularities of the porous plate, the frequency of the porous plate 21a, the exhaustion At least one of the suction air volume and the like according to the outlet 21e can be made different from that of the first stage specific gravity difference sorting device 21A. Specifically, while the hole diameter of the first stage porous plate is 1 mm (1 mm mesh) in the present embodiment, the hole diameter of the second stage porous plate is 105 μm (150 mesh).

  However, the first stage porous plate is not limited to the hole diameter of 1 mm, and the hole diameter of 2 to 0.5 mm can be selected. Also, the pore diameter of the second stage porous plate is not limited to 105 μm, and a pore diameter of 75 to 500 μm can be selected.

In the dry separation method of this embodiment, the heavy specific gravity components sorted by the porous plate 21a of the second stage specific gravity difference sorting device 21B are discharged from the outlet 21c of the specific gravity difference sorting device 21B and recovered. The heavy specific gravity component recovered is a density of 2.5 g / cm ³ or more. The heavy specific gravity component satisfies a density of 2.5 g / cm ³ or more specified by “sand” of JIS A5308, and can be used as a fine aggregate as it is.

  The light specific gravity component sorted by the porous plate 21a of the second stage specific gravity difference sorting device 21B is discharged from the outlet 21d of the specific gravity difference sorting device 21B. The discharged low specific gravity component is passed through a belt feeder 9 to a screen 23 described later.

  The dust collected from the porous plate 21a of the second stage specific gravity difference sorting device 21B is guided to the cyclone classifier 22 through a conduit 7B connected to the discharge port 21e of the specific gravity difference sorting device 21B. The cyclone classifier 22 is as described above.

  The fine particles dropped through the holes of the porous plate 21a of the second stage specific gravity difference sorting device 21B are discharged from the outlet 21f of the specific gravity difference sorting device 21B and recovered as a shirasu balloon raw material or an admixture material raw material. Depending on the difference in the working conditions such as the hole diameter of the porous plate 21a of the second stage specific gravity difference sorting device 21B and the type of the raw material, the fine particles dropped through the holes of the porous plate 21a and discharged from the discharge port 21f are JIS It may conform to the standard of A5002 "lightweight concrete aggregate for construction", and in this case, the fine grains can be recovered as a light weight aggregate.

Depending on the raw material and the working conditions, those with a density of 2.5 g / cm ³ or more are recovered depending on the raw material and the working conditions of the porous plate falling portion discharged from the outlet 21f through the holes of the porous plate 21a of the second stage specific gravity difference sorting device 21B May be In this case, the porous plate falling portion can be mixed with the fine aggregate D and used.

  The sieve 23 has a predetermined mesh size. The mesh of the sieve 23 can be, for example, 300 μm. The light specific gravity component of the first stage specific gravity difference sorting device 21A and the light specific gravity component of the second stage specific gravity difference sorting device 21B are introduced to the sieve 23 and divided into a sieve top and a sieve lower side.

  The light specific gravity portion of the first stage specific gravity difference sorting device 21A and the light specific gravity portion of the second stage specific gravity difference sorting device 21B contain pumice having a particle diameter of 0.3 mm or more. The pumice having a particle size of 0.3 mm or more is useful as a lightweight aggregate. Therefore, lightweight aggregate can be recovered by screening with a sieve 23 with a particle size of 0.3 mm.

  Further, under the sieve 23 is a volcanic glass having a particle size of less than 0.3 mm. In particular, when the volcanic ejecta deposit mineral is shirasu as in this embodiment, the volcanic glass having a particle size of less than 0.3 mm is foamed by heating, and thus is useful as a pearlite raw material or a shirasu balloon raw material. In the dry separation method of the present embodiment, the fine powder having a particle size of about 0.05 mm or less is classified in large numbers in advance by the discharge port 21e of the first stage specific gravity difference sorting device 21A and the second stage specific gravity difference sorting device 21B. Therefore, the lower part of the sieve 23 contains almost no fine powder. Therefore, under the screen of the screen 23, it is possible to obtain a pearlite material or a shirasu balloon material having a good foamability.

When utilizing volcanic glass with a particle size of less than 0.3 mm in the light specific gravity part of the first stage specific gravity difference sorting device 21A and the light specific gravity part of the second stage specific gravity difference sorting device 21B, it is not always necessary to use a sieve 23 . FIG. 10 is a modification of FIG. The dry separation apparatus shown in FIG. 10 does not have the sieve 23.
As shown in FIG. 10, even if the light specific gravity component does not sift with a particle diameter of 0.3 mm by the sieve 23, the sieve 23 is omitted if it conforms to the standard of JIS A5002 “Lightweight concrete aggregate for structure”. Can be simplified to recover lightweight aggregate.

According to the dry separation method of the present embodiment shown in FIGS. 9 and 10, not only the effects of the third embodiment shown in FIGS. 6 and 8 are obtained, but also the first stage specific gravity difference sorting apparatus 21A and the second stage The yield and the sorting ability can be enhanced by using the specific gravity difference sorting device 21B. Therefore, the ratio of the recovered heavy specific gravity component D can be improved, and the yield of fine aggregate having a density of 2.5 g / cm ³ or more can be further enhanced.

  The second stage specific gravity difference sorting device 21B is not necessarily limited to a separate device. After performing dry separation work of a predetermined amount using the first stage specific gravity difference sorting apparatus 21A, replace the porous plate of the specific gravity difference sorting apparatus 21A and use it instead of the second stage specific gravity difference sorting apparatus 21B You can also.

Embodiment 5
In the dry separation method used in the dry separation method of the present embodiment, in the example shown in FIG. 9, the dust collected from the porous plate 21a of the first stage specific gravity difference sorting apparatus 21A and the second stage specific gravity difference sorting apparatus 21B The dust collected from the perforated plate 21a is guided to one cyclone classifier 22 through the conduits 7A and 7B connected to the outlet 21e to separate and collect the volcanic glass fine particles E2, and the bag filter 16 Glass material fine powder F is separated and collected.

  The first stage specific gravity difference sorting device 21A and the second stage specific gravity difference sorting device 21B may be used by connecting two stages of devices having the same performance as shown in FIG. At least one or more of the inclination angle of the plate 21a, the size of the holes of the porous plate 21a, the shape of the holes, the number of holes, the shape of the unevenness of the porous plate, the frequency of the porous plate 21a, and the amount of air drawn from the outlet 21e It is often used by changing the work conditions of. Therefore, in order to perform the specific gravity separation comprising the two-stage specific gravity difference sorting apparatus with higher accuracy, it is necessary to control the above-mentioned operation conditions finely and with high accuracy.

  It is known that the separation performance in the specific gravity difference sorting apparatus is also influenced by the amount of air drawn from the outlet 21e. The intake air flow rate for the conduit 7A and the conduit 7B for the discharge port 21e in FIG. 9 is a butterfly valve or the like installed in the piping depending on the performance and operating conditions of the cyclone classifier 22 and the bag filter 16 and the exhaust blower 18. If it is going to adjust either of the suction air volume which concerns on 7A or 7B, it will affect each other, and fine adjustment of the suction air volume of the first stage and the second stage may be difficult. Therefore, if the cyclone classifier, the bag filter, and the exhaust blower can be operated independently in the first and second stages, high-accuracy specific gravity separation becomes possible. Therefore, a modified example of this embodiment in which one set of a cyclone classifier 22, a bag filter 16 and an exhaust blower 18 are added to the two-stage specific gravity separator of FIG. 9 is shown in FIG.

  In FIG. 10, the first stage specific gravity difference sorting apparatus is 21D, and the second stage specific gravity difference sorting apparatus is 21E. The light specific gravity component of the first stage specific gravity difference sorting apparatus 21D and the light specific gravity component of the second stage specific gravity difference sorting apparatus 21E contain volcanic glass having a particle size of 0.3 mm or less, but in FIG. It is not sifted by. As in the modification shown in FIG. 10, the sieve 23 is omitted in the case where the sieve 23 conforms to the standard of JIS A5002 “Lightweight concrete aggregate for structure” even if it is not sieved with a particle size of 0.3 mm. The lightweight aggregate E1 can be recovered in a simplified manner. Of course, in FIG. 10, sieving may be performed with a sieve 23, for example, with a particle size of 0.3 mm.

  Further, in FIGS. 9 and 10, depending on the working conditions of the second stage specific gravity difference sorting device 21E, it is possible to make the discharge amount of the porous plate drop discharged from the discharge port 21f zero, in this case In the second stage specific gravity difference sorting device 21E, it is not necessary to sort the porous plate falling portion, but the heavy specific gravity fraction is obtained by the second stage specific gravity difference sorting device 21E and the cyclone classifier 22B and the bag filter 16B connected thereto. It can be simplified by sorting the light specific gravity part and the dust collection part (cyclone collection part, bag filter collection part) in total into four divisions.

Embodiment 6
One embodiment of the method for dry separation of volcanic product deposit mineral of the present invention will be described with reference to FIG.
FIG. 11 is a schematic view showing an example of a dry separation apparatus used in the dry separation method of the present invention. In FIG. 11, the same members as those described above with reference to the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

  The dry type separation apparatus shown in FIG. 11 is provided with a total of two specific gravity difference selection apparatuses of the first stage air table type specific gravity difference selection apparatus 21D and the second stage air table type specific gravity difference selection apparatus 21E. The first stage specific gravity difference sorting apparatus 21D can have the same structure and operation conditions as the specific gravity difference sorting apparatus 21 described in the third embodiment.

Depending on the raw materials and the working conditions, fine aggregate with a density of 2.5 g / cm ³ or more may be mixed in the light specific gravity component discharged from the outlet 21 d of the first stage specific gravity difference sorting device 21D. In this case, as in the present embodiment shown in FIG. 11, the light specific gravity component sorted by the first stage specific gravity difference sorting apparatus 21D is supplied to the second stage specific gravity difference sorting apparatus 21E, and the specific gravity is The differential sorting device 21E can separate and collect into a heavy specific gravity, a porous plate falling part, a light specific gravity part, and a dust collecting part (cyclone collected part, bag filter collected part).

Further, in FIG. 11, depending on the working conditions of the second stage specific gravity difference sorting device 21E, it is possible to make the discharge amount of the porous plate drop discharged from the outlet 21f zero, in this case, two stages It is not necessary to sort the porous plate falling portion in the specific gravity difference sorting device 21E of the eye, and the heavy specific gravity component, the light specific gravity, and the collection are collected by the second stage specific gravity difference sorting device and the cyclone classifier 22B and the bag filter 16B connected thereto. A total of four divisions of dust (cyclone collected, bag filter collected) can be simplified for sorting.
Here, the second stage specific gravity difference sorting device 21E can have the same structure and operation conditions as the specific gravity difference sorting device 21 described in the third embodiment.

Seventh Embodiment
One embodiment of the method for dry separation of volcanic product deposit mineral of the present invention will be described with reference to FIG.
FIG. 12 is a schematic view showing an example of a dry separation apparatus used in the dry separation method of the present invention. In FIG. 12, the same members as those described above with reference to the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

  The dry type separation apparatus shown in FIG. 12 is equipped with a total of two specific gravity difference selection apparatuses of the first stage air table type specific gravity difference selection apparatus 21D and the second stage air table type specific gravity difference selection apparatus 21E. The first stage specific gravity difference sorting apparatus 21D can have the same structure and operation conditions as the specific gravity difference sorting apparatus 21 described in the third embodiment.

  Depending on the raw materials and working conditions, there may be cases where pumice with a particle size of 0.3 mm or more is mixed in the cyclone recovery discharged from the outlet 21e of the first stage specific gravity difference sorting device 21D. In this case, as in the present embodiment shown in FIG. 12, among the dust collected by the first stage specific gravity difference sorting device 21D, the cyclone collected by the cyclone classifier is used as the second stage. It is supplied to the specific gravity difference sorting device 21E and separated into heavy gravity, porous plate falling, light specific gravity, dust collecting (cyclone collected, bag filter collected) by the second stage specific gravity difference selecting apparatus 21E. It can be recovered.

  In addition, depending on the working conditions of the second stage specific gravity difference sorting device 21E, it is possible to make the discharged amount of the porous plate drop discharged from the outlet 21f zero, and the second stage specific gravity difference sorting device and By the cyclone classifier 22B and the bag filter 16B connected thereto, it is possible to simplify sorting by dividing into four parts in total: heavy specific gravity, light specific gravity, dust collection (cyclone collection, bag filter collection).

The dry separation apparatus used in the dry separation method of the present embodiment is, in the example shown in FIG. 9, the first stage air table type specific gravity difference sorting apparatus 21A and the second stage air table type specific gravity difference sorting apparatus 21B. A total of two specific gravity difference sorting devices 21 are provided.
In the example shown in FIGS. 10 to 12, a total of two specific gravity difference sorting devices 21 of the first stage air table type specific gravity difference sorting device 21D and the second stage air table type specific gravity difference sorting device 21E are provided There is.
However, in the dry separation method and dry separation device of the present embodiment, the total of the specific gravity difference sorting devices is not limited to two in total, and may be three or more in total. For example, when the density of the heavy specific gravity component D by the first stage specific gravity difference sorting device does not reach 2.5 g / cm ³ or more, or when the second stage specific gravity difference sorting device performs the heavy specific gravity fraction D or the perforated plate falling portion When the density of D does not reach 2.5 g / cm ³ or more, the density of heavy specific gravity D can be ensured to 2.5 g / cm ³ by the third stage specific gravity difference selector, which is preferable. . In addition, when the water content of the raw material is high, or when the separation of the heavy specific gravity component and the light specific gravity component is insufficient in the first or second stage specific gravity difference selector, the mineral composition of the raw material (crystalline and volcanic glass Even when the ratio of quality is largely different from that of the example, the dry separation method can be performed using a dry separation device provided with a third stage specific gravity difference selector or a specific gravity difference selector higher than that.

(Embodiment 8)
An embodiment of the method for dry separation of volcanic product deposit minerals and the dry separation apparatus of the present invention will be described. FIG. 13 is a schematic view showing an example of a dry separation apparatus used in the dry separation method of the present invention. In FIG. 13, the same members as those described above with reference to the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

  The dry separation device shown in FIG. 13 includes an air flow classification device 10. This air flow classification device 10 includes cyclone classification machine groups 12 to 14 for coarse particle collection, a cyclone classification machine 15 for fine particle collection, and a bag filter 16 for fine powder collection connected to the cyclone classifier. There is. More specifically, the air flow classification device 10 includes a plurality of cyclone crushers 11A, 11B, 11C, a plurality of cyclone classifiers 12 to 15, and a bag filter 16, and pipes 17A to 17I connecting these. ing. The dry separation device further includes a total of two specific gravity difference selection devices 21 of the first stage air table type specific gravity difference selection device 21A and the second stage air table type specific gravity difference selection device 21B.

  The air flow classification device 10 shown in FIG. 13 is the same as the air flow classification device 10 described in the first and second embodiments. The number of cyclone disintegrators is not limited to three as illustrated, and the number of cyclone classifiers of a cyclone classifier group for collecting coarse particles is not limited to three as illustrated.

  The air flow classification device 10 has a rotary feeder 20. Depending on the water content of ordinary shirasu, whether ordinary shirasu is supplied from the rotary feeder 20 to the cyclone classifier 13 or ordinary shirasu to the cyclone crusher 11A It is possible to select whether to supply shiras normally or both. Usually, shirasu has a moisture of about 20% when not dried. When the raw ordinary shirasu has a water content of about 10 to 20%, it is preferable to supply the ordinary shirashi to the cyclone crusher 11A and to crush and dry the same in the cyclone crusher 11A to 11C. When the raw material ordinary shirasu has a water content of about 10 to 4%, the cyclone crusher 11A to 11C can be used, or the rotary feeder 20 and the cyclone crusher 11A to 11C can be used in combination. When the raw ordinary shirasu has a water content of less than 4%, the ordinary shirasu can be supplied from the rotary feeder 20 and supplied to the cyclone classifier 13.

  Fractions with a particle size of more than 5 mm are removed as sieves by means of the sieve 4 shown, and the remainder is supplied to the pneumatic classifier 10 as sieves. Instead of the sieve 4, it is also possible to use a machine that grinds the particle size of the common shirasu, which is a raw material, to 5 mm or less.

  Classification of ordinary shirasu by the air flow classification device 10 is the same as the air flow classification device 10 described in the first embodiment and the second embodiment, and the particle diameter of about 0.3 to 5 mm (average particle diameter 0.4 mm) by the cyclone classifier 12 Coarse particles are recovered, and fine particles with a particle diameter of about 0.05 to 0.3 mm (average particle diameter of about 0.1 mm) are recovered by a cyclone classifier 15, and a particle diameter of 0.05 mm is obtained by a bag filter 16. The following fine powder (average particle diameter about 0.033 mm) is recovered.

  The coarse particles are supplied to the first stage specific gravity difference selector 21A. The first stage specific gravity difference sorting apparatus 21A and the second stage specific gravity difference sorting apparatus 21B have the same structure and operation as the first stage specific gravity difference sorting apparatus 21A and the second stage specific gravity difference sorting apparatus 21B described in the fourth embodiment. It can be a condition.

The dry separation apparatus used in the dry separation method of the present embodiment is, in the example shown in FIG. 13, an air table type specific gravity difference sorting apparatus 21A of the first stage and a specific gravity difference sorting apparatus 21B of the second stage. A total of two specific gravity difference sorting devices 21 are provided. However, in the dry separation method and dry separation device of the present embodiment, the total of the specific gravity difference sorting devices is not limited to two in total, and may be three or more in total. For example, when the density of the heavy specific gravity component D by the first stage specific gravity difference sorting device does not reach 2.5 g / cm ³ or more, or the density of the heavy specific gravity component D by the second stage specific gravity difference sorting device is 2. If the density does not reach 5 g / cm ³ or more, the density of the heavy specific gravity component D can be reliably 2.5 g / cm ³ by the third stage specific gravity difference selector, which is preferable. In addition, when the water content of the raw material is high, or when the separation of the heavy specific gravity component and the light specific gravity component is insufficient in the first or second stage specific gravity difference selector, the mineral composition of the raw material (crystalline and volcanic glass Even when the ratio of quality is largely different from that of the example, the dry separation method can be performed using a dry separation device provided with a third stage specific gravity difference selector or a specific gravity difference selector higher than that.

The heavy specific gravity component sorted by the porous plate 21a of the first stage specific gravity difference sorting device 21A is discharged from the discharge port 21c of the specific gravity difference sorting device 21A and collected. The heavy specific gravity component D collected is 2.5 g / cm ³ or more in density. The heavy specific gravity component D satisfies a density of 2.5 g / cm ³ or more specified by “sand” of JIS A5308, and can be used as a fine aggregate as it is.

  The light specific gravity component sorted by the porous plate 21a of the first stage specific gravity difference sorting device 21A is discharged from the outlet 21d of the specific gravity difference sorting device 21A. The discharged low specific gravity component is applied to a sieve 23 described later via the belt conveyor 6 and the belt feeder 9.

  The dust collected from the porous plate 21a of the first stage specific gravity difference sorting device 21A is guided to the cyclone classifier 22 through a conduit 7A connected to the outlet 21e of the specific gravity difference sorting device 21A. The cyclone classifier 22 classifies more lightweight fine powder as the overflow component from the dust collection. The cyclone recovery of the underflow is recovered as a shirasu balloon raw material or an admixture raw material E2. Further, fine powder of the overflow portion of the cyclone classifier 22 is led to the bag filter 16 through the pipe line 7C connected to the pipe line 17I and collected. The bug filter 16 is as described above.

The ordinary shirasu dropped from the perforated plate 21a of the first stage specific gravity difference sorting apparatus 21A is supplied to the second stage specific gravity difference sorting apparatus 21B for sorting.
The heavy specific gravity component D sorted by the porous plate 21a of the second stage specific gravity difference sorting device 21B is discharged from the outlet 21c of the specific gravity difference sorting device 21B and collected. The heavy specific gravity component D collected is 2.5 g / cm ³ or more in density. The heavy specific gravity component satisfies a density of 2.5 g / cm ³ or more specified by “sand” of JIS A5308, and can be used as a fine aggregate as it is.

  The light specific gravity component sorted by the porous plate 21a of the second stage specific gravity difference sorting device 21B is discharged from the outlet 21d of the specific gravity difference sorting device 21B. The discharged low specific gravity component is passed through a belt feeder 9 to a screen 23 described later.

  The dust collected from the porous plate 21a of the second stage specific gravity difference sorting device 21B is guided to the cyclone classifier 22 through a conduit 7B connected to the discharge port 21e of the specific gravity difference sorting device 21B. The cyclone classifier 22 is as described above. The fine powder of the overflow portion of the cyclone classifier 22 is led to the bag filter 16 through the pipe line 7C connected to the pipe line 17I, and the fine powder F is recovered by the bag filter 16. The fine powder F is mainly made of volcanic glass and is useful as a mixed cement raw material having pozzolanic effect, more specifically, as an additive or a raw material thereof.

  The fine particles dropped through the holes of the porous plate 21a of the second stage specific gravity difference sorting device 21B are discharged from the outlet 21f of the specific gravity difference sorting device 21B and recovered as a shirasu balloon raw material or an admixture material raw material E2. Depending on the hole diameter of the porous plate 21a of the second stage specific gravity difference sorting device 21B, the fine particles dropped through the holes of the porous plate 21a and discharged from the outlet 21f are JIS A5002 "lightweight concrete aggregate for structure" In some cases, the fine grains can be recovered as lightweight aggregate.

  The sieve 23 has a predetermined mesh size. The mesh of the sieve 23 can be, for example, 300 μm. In the sieve 23, fine particles of the underflow of the cyclone classifier 15 of the air flow classification device 10, the light specific gravity of the first stage specific gravity difference sorting device 21A, and the light specific gravity fraction of the second stage specific gravity difference sorting device 21B Guide and divide into a sieve top and a sieve bottom.

  The fine particles classified as the underflow component of the cyclone classifier 15 of the air flow classification device 10 are mainly volcanic glass and include pumice having a particle diameter of 0.3 mm or more. The pumice having a particle size of 0.3 mm or more is useful as the lightweight aggregate E1. Further, the light specific gravity component of the first stage specific gravity difference sorting device 21A and the light specific gravity component of the second stage specific gravity difference sorting device 21B also contain pumice having a particle diameter of 0.3 mm or more. The pumice having a particle size of 0.3 mm or more is useful as the lightweight aggregate E1. Therefore, by sieving with a sieve 23 with a particle size of 0.3 mm, the lightweight aggregate E1 can be recovered.

  Further, under the sieve 23 is a volcanic glass having a particle size of less than 0.3 mm. In particular, when the volcanic ejecta deposit mineral is a shirazu as in this embodiment, the volcanic glass having a particle size of less than 0.3 mm is foamed by heating, and thus it is useful as a pearlite raw material or a shirasu balloon raw material or an admixture material raw material E2. It is. In the dry separation method of the present embodiment, fine powder having a particle diameter of 0.05 mm or less is classified in advance by the air flow classification device 10, and therefore the lower part of the screen of the sieve 23 hardly contains the fine powder. Therefore, the lower part of the sieve 23 can obtain the shirasu balloon raw material E2 having a good foamability. The perlite raw material or the shirasu balloon raw material E2 can be further pulverized into a fine powder F and used as an admixture.

In the method for dry separation of volcanic product deposit mineral according to the present embodiment, ordinary shirasu is classified into coarse particles, fine particles and fine particles by the air flow classification device 10, and then the coarse particles are subjected to the specific gravity of the first stage of the air table type. The heavy and heavy specific gravity components, the light specific gravity components, the porous plate falling component and the dust collection components are sorted by the difference sorting device 21A, and then the heavy specific gravity components, the light specific gravity components and the porosity are given by the second stage specific gravity difference sorting device 21B. By separating the light specific gravity component into fine particles and separating it into a plate falling component and a dust collecting component, the ordinary shirasu is classified into a heavy specific gravity component D, a sieve top E1, a sieve bottom E2, and a fine powder F Can be separated into The heavy specific gravity component D is mainly composed of crystalline mineral and contains almost no volcanic glass. Therefore, the high specific gravity component D has a high density and exceeds 2.5 g / cm ³ . In addition, the sieve top E1, the sieve bottom E2 and the fine powder F are mainly made of volcanic glass and contain almost no crystalline mineral. Therefore, the crystalline mineral which can be a heavy specific gravity component hardly mixes with the sieve E1 and the sieve E2 and the fine powder F. Therefore, according to the dry separation method of the present embodiment, the yield of fine aggregate having a density of 2.5 g / cm ³ or more can be enhanced. Further, the heavy specific gravity component has a small content of dust collected with a particle diameter of 0.150 mm or less, and satisfies the requirements of a wide particle size distribution of 0.15 mm to 5 mm defined in “sand” of JIS A5308. Furthermore, since the heavy specific gravity component hardly contains porous particles such as pumice with high water absorption, the water absorption meets the criteria of “sand” of JIS A5308 which is required as a fine aggregate.

  Further, according to the dry separation method of the present embodiment, the heavy specific gravity component D is a fine aggregate, the sieve top E1 is a lightweight aggregate of the volcanic glass, and the sieve lower E2 is a perlite raw material of the volcanic glass or As the Shirasu balloon raw material, the fine powder F can be effectively used as an admixture of the volcanic glass or a mixed cement raw material having a pozzolanic effect, respectively, in other words, there is no unnecessary residue.

  According to the dry separation method of the present embodiment, the specific gravity is classified into the coarse particles, the fine particles, and the fine powder which are surface dried in advance by the air flow classification device 10 before being sorted by the specific gravity difference sorting device 21. The coarse particles supplied to the differential sorting apparatus 21 hardly contain fine powder causing clogging of the porous plate 21a, and therefore, occurrence of operation trouble due to clogging can be suppressed. Further, the specific gravity difference sorting by the specific gravity difference sorting device 21 is easier to sort as the particle size distribution width of the powder particles to be sorted is narrower, but according to the dry separation method of the present embodiment, it was classified in advance by the airflow classification device 10 Since only coarse particles are sorted by specific gravity difference sorting by the specific gravity difference sorting device 21, the sorting ability of the specific gravity difference sorting device 21 can be enhanced.

  In the prior art, with regard to sizing of ordinary shirasu, the construction manual for concrete using shirasu as a fine aggregate (draft) published in 2006 also describes the reason that it is practically difficult to regularize shirasu, Even though it was proposed to use ordinary shirasu which does not remove dust with a particle size of 0.15 mm or less, it was in the common sense that sizing of ordinary shirasu was not profitable. According to the invention, it was possible to simultaneously produce various types of low-cost, high-value-added granules at the same time.

(Fine aggregate)
The coarse particle A or the heavy specific gravity component D obtained by the method for dry separation of volcanic product sediment mineral according to the present invention has a density of 2.5 g / cm ³ or more, and can be used for fine aggregate.
The coarse grain A or heavy specific gravity D obtained by the method of the present invention is different from the conventionally known river sand or sea sand as fine aggregate in that the coarse grain A or heavy specific gravity D is a aquatic organism. There is no trace. The fine aggregate (sand) obtained by the present invention is completely free of traces such as aquatic plants or plankton of the indicator organisms, microorganisms, shellfish, amphibians, crustaceans, fish eggs, fish, etc. Ecology of aquatic organisms and plants It has the advantage of reducing the environmental load without destroying the system environment. Shirasu is a type of mountain sand, but pyroclastic flow deposits are not moved by natural water, and sedimentally deposited on land about 30,000 years before the occurrence of the pyroto include pyrolyzed flow, and once subjected to water flooding. Not present, there is a huge amount of 75 billion cubic meters in undisturbed condition. On the other hand, river sands and sea sands in Kagoshima were washed off by the action of water on the Shirasu plateau and deposited on the riverbed or seabed centering on heavy mineral particles such as magnetite, feldspar, quartz, amphibole and pyroxene in the shiras The clay and fines have been washed away and diffused to the environment. So the origin is the same, but the impact on the environmental load of the ecosystem is different. The difference is clear if it is judged biologically or phytologically whether there is such a trace or not.

In addition, conventionally known sea sand may contain a little pumice and may contain salt, whereas the fine aggregate (sand) obtained by the method of the present invention is about 30,000 years ago. It is a non-salt sand which does not contain salt, which is a heavy specific gravity component obtained by dry separation of the pyroclastic flow sediment deposited on the surface of the sand.
Furthermore, the difference with the conventionally known river sand is that the difference between the "sand" of the present invention is clear, depending on whether or not there are traces of freshwater organisms and freshwater plants.
Not only the fine aggregate obtained by the method of the present invention, but also pumice, volcanic glass and fine powder can be identified with the same difference.

(Volcanic glass material)
In addition, the remaining volcanic glass material obtained by separating fine aggregate by the method for dry separation of volcanic product sedimentary mineral according to the present invention exceeds 0.3 mm by sieving and dust collection, and 0.05 mm to 0 mm by sieving and dust collection. It can be separated into three types, 3 mm and less than 0.05 mm. Among them, those exceeding 0.3 mm can be used as lightweight aggregate, those from 0.05 mm to 0.3 mm can be used as perlite raw material or shirasu balloon raw material, or further crushed and used as admixture, and those less than 0.05 mm These can be used as admixtures or further pulverized to be ultrafine admixtures. Admixtures obtained by further grinding one having a diameter of 0.05 mm to 0.3 mm and admixtures obtained by further grinding one having a diameter of less than 0.05 mm have a pozzolanic effect. The apparatus which grinds the volcanic glass material of these particle sizes can illustrate a vibrating mill. Other than the vibration mill, various mills such as a roller mill and a JET mill can also be used.
Among the volcanic glass materials, those with a particle size of less than 0.05 mm collected by a bag filter for collecting fine powder have a density of 2.30 g / cm ³ or more and an ignition loss of 3.5% or less .

  In addition, the above-mentioned admixture, that is, one having a particle diameter of less than 0.05 mm obtained by separating volcanic deposit sediment minerals by the dry separation method according to the present invention, a particle diameter of 0.05 mm to 0 obtained by separation. .3 mm of crushed material, obtained particle diameter of less than 0.05 mm is further crushed into ultrafine and mixed cement which is made by mixing Portland cement is more resistant to seawater and hot spring than ordinary cement It is excellent in resistance, chemical resistance, compactness, long-term durability, and has pozzolanic effect. When mixed cement is manufactured by crushing a mixture of volcanic glass material and portland cement, the two types of particles are uniformly mixed with each other and dried, and the reaction by the effect of mechanochemical reaction and pulverization. It becomes a mixed cement that increases its strength and develops higher strength. For use in mixed cement, pulverize volcanic glass material with a particle diameter of 0.05 mm to 0.3 mm, or pulverize volcanic glass material with a particle diameter of less than 0.05 mm further into ultrafine particles The apparatus can exemplify a vibrating mill. Other than the vibration mill, various mills such as a roller mill and a JET mill can also be used.

  The remaining volcanic glass material obtained by separating fine aggregate by the method for dry separation of volcanic ejecta sediment mineral according to the present invention, which is the crushed volcanic glass material having a particle diameter of 0.05 mm or more as it is or crushed After firing, it can be fired and expanded to obtain perlite. Volcanic glass material having a particle diameter of 0.05 mm or more is a portion excluding fine powder having a particle diameter of 0.05 mm or less collected by the bag filter 16 among the volcanic glass materials, and specifically, collected by the air flow classification device 10 Fine particles, and light specific gravity components sorted by the specific gravity difference sorting device 21. Such perlite raw material is not limited to the screen E2 under the screen 23 described above, and "pumice" of the screen E1 can be used separately from the screen E2 or together with the screen E2. By firing and forming the “pumice stone” on the sieve E1, it becomes a large grain pumice stone “pearlite” equivalent to large-grained JIS A 5007, which is lighter than the lightweight aggregate.

  The volcanic glass material having a particle size of 0.05 mm or more may or may not be sieved by the sieve 23 on and under the sieve. Moreover, you may grind | pulverize the volcanic glass material of particle size 0.05 mm or more as needed. Furthermore, 0.105 mm or more and less than 0.105 mm may be sorted by sorting means such as sieving so as to obtain pearlite by using a material having a size of 0.105 mm or more as a raw material.

Pearlite is obtained by expanding the separated volcanic glass material having a particle diameter of 0.05 mm or more as it is or after grinding and firing. Volcanic glass materials expand and foam during firing in a flame or in a high temperature atmosphere, and the average particle size increases by about 1.5 times. For example, a volcanic glass material of 0.105 mm expands upon firing to a particle size of about 0.15 mm. The pearlite obtained by firing is a pearlite satisfying the particle size specified in JIS A5007.
For the firing to obtain pearlite, a stationary vertical furnace or a horizontal rotary furnace (rotary kiln) can be used.

  Of the remaining volcanic glass materials obtained by separating fine aggregate by the dry separation method of volcanic ejecta sediment mineral according to the present invention, one having a particle diameter of 0.05 mm or more, as it is or crushed, is fired and expanded. Since the pearlite obtained is a high purity volcanic glass from which the crystalline (magnetite, feldspar, quartz, pyroxene, amphibole etc.) of heavy specific gravity which does not foam is removed, it is a waste crystalline which becomes a defect product By using fossil fuels efficiently, it is possible to produce wasteless perlite by eliminating losses that add energy at the time of firing. In addition, since the inclusion of defective products is minimized, the quality as a "perlite" product equivalent to JIS A5007 is improved. Furthermore, for example, it is possible to use a stationary vertical furnace which is easy to move, has a simple structure, and is low in cost as a baking furnace, and high purity volcanic glass from above the flame of the burner directly below this stationary vertical furnace. A pearlite equivalent to JIS A5007 can be manufactured by a simple method in which the material (0.105 mm or more + pumice stone) is directly poured. Furthermore, defective products such as heavy gravities (crystal minerals) and non-foamed (low foaming) volcanic glass raw materials that are slightly contained are separated by gravity under the open flame burner of the firing furnace, so exhaust The combined effect with the vertical furnace that the quality of the silasperite product recovered by the cyclone together with the gas is improved can be exhibited more.

  EXAMPLES The present invention will next be described in more detail by way of examples, which should not be construed as limiting the invention thereto.

(Reference Example 1)
Using the apparatus and method of the first embodiment shown in FIG. 1, the ordinary shirasu, which is the raw material volcanic deposit sediment mineral, is the Shirashi Shirasu (water content: 4.6%) produced in Aira-cho, Kanoya city, Kagoshima prefecture. The one separated by a sieve 4 of 5 mm was used. The density was 2.37 g / cm ³ under a 5 mm sieve of Aira Shirasu, which is ordinary shiras.

  When the Shira Shirasu sorted by the sieve 4 is charged from the inlet of the cyclone crusher 11A at a charging rate of 27.3 kg / h, the suction force to the pipelines 17A to 17I caused by the exhaust blower 18 works at the inlet. A smooth, large amount of raw material input without clogging was possible.

Normally, shirasu went through cyclone disintegrators 11A to 11C, and coarse particles A were recovered by a cyclone classifier 12. The average particle diameter of the coarse particles A was 1.52 mm, the water content was 3.5%, and the specific gravity was 2.50. The mass percentage of coarse particles A having a density of 2.50 g / cm ³ or more relative to ordinary shirasu before being introduced into the dry separation apparatus was 12.0%. This means that the yield of coarse particles having a density of 2.50 g / cm ³ or more that can be used for fine aggregate was 12.0%.

Except coarse particles, they were sent to the cyclone classifier 15 through the cyclone classifiers 13 and 14 and the conduits 17D to 17H. Fine particles were collected in a cyclone classifier 15. The fine particles were sieved by a sieve 19 with a mesh of 300 μm. Here, the gap between the flange joints of the opening 12a is 1.8 mm, and the gap between the flange joints of the opening 15a is 0 mm. Among the fine grains, the portion B1 on the sieve had a moisture content of 2.3% and a density of 1.54 g / cm ³ . The percentage by mass of the portion B1 on the screen to the ordinary shirasu before being introduced into the dry separation apparatus was 8.4%.

In addition, the portion B2 below the sieve had an average particle diameter of 0.16 mm, a moisture content of 1.2%, and a specific gravity of 2.40 g / cm ³ . The percentage by mass of the part B2 below the sieve relative to the common shirazu before being introduced into the dry separation apparatus was 74.4%.

  The fine powder other than fine particles was conveyed to the air stream, and the fine powder C was recovered in the bag filter 16 through the pipe line 17I. The carrier air flow that has passed through the filter cloth of the bag filter 16 is exhausted by the exhaust blower 18.

The average particle size of the fine powder C was 0.0033 mm, the water content was 3.0%, and the density was 2.48 g / cm ³ . The mass percentage of the fine powder C to ordinary shirasu before being introduced into the dry separation apparatus was 2.4%.

  It should be noted that the percentage by weight of the coarse particles A, the percentage by weight of the part B1 on the sieve, the percentage by weight of the part B2 below the sieve, and the percentage by weight of the fine powder C does not reach 100%. It is because 2.8% remained.

(Reference Example 2)
As ordinary shirasu, which is a raw material volcanic deposit sediment mineral, using the apparatus and method of embodiment 2 shown in FIG. 3%) was screened with a 5 mm sieve 4 and used. The density was 2.37 g / cm ³ under a 5 mm sieve of Aira Shirasu, which is ordinary shiras.

  Aira shirasu sorted by the sieve 4 was fed from the rotary feeder 20 to the cyclone classifier 13 at a feeding speed of 20.4 kg / h. Since this ordinary shirasu had a low moisture content, it could be classified with a cyclone classifier without passing through a cyclone crusher group. Here, the gap between the flange joints of the opening 12a is 1.8 mm, and the gap between the flange joints of the opening 15a is 0 mm.

Normally, Shirasu collected coarse particles A with a cyclone classifier 12. The density of coarse particles A was 2.51 g / cm ³ . The mass percentage of coarse particles A having a density of 2.50 g / cm ³ or more relative to ordinary shirasu before being introduced into the dry separation apparatus was 11.0%. This means that the yield of coarse particles having a density of 2.50 g / cm ³ or more usable for fine aggregate was 11.0%.

Except coarse particles, they were sent to the cyclone classifier 15 through the cyclone classifiers 13 and 14 and the conduits 17D to 17H. Fine particles were collected in a cyclone classifier 15. The fine particles were sieved by a sieve 19 with a mesh of 300 μm. Of the fine grains, the portion B1 on the sieve had a moisture content of 1.7% and a density of 1.53 g / cm ³ . The mass percentage of the part B1 on the sieve to the ordinary shirasu before being introduced into the dry separation apparatus was 8.6%.

Further, the portion B2 below the sieve had an average particle diameter of 0.173 mm, a water content of 0.8%, and a density of 2.40 g / cm ³ . The percentage by mass of the part B2 below the sieve relative to the common shirazu before being introduced into the dry separation apparatus was 75.1%.

  The fine powder other than fine particles was conveyed to the air stream, and the fine powder C was recovered in the bag filter 16 through the pipe line 17I. The carrier air flow that has passed through the filter cloth of the bag filter 16 is exhausted by the exhaust blower 18.

The average particle size of the fine powder C was 0.0036 mm, the water content was 1.8%, and the density was 2.47 g / cm ³ . The mass percentage of the fine powder C to common shirasu before being introduced into the dry separation apparatus was 3.0%.

  It should be noted that the percentage by weight of the coarse particles A, the percentage by weight of the part B1 on the sieve, the percentage by weight of the part B2 below the sieve, and the percentage by weight of the fine powder C does not reach 100%. It is because 2.3% remained.

Example 1
In the apparatus and method of Embodiment 3 shown in FIG. 6, dried ordinary Shirasu, which is a raw material volcanic deposit sediment mineral, dried at 105 ° C. for 24 hours at Aira Shirasu produced in Aira-cho, Kanoya-shi, Kagoshima (Water content of 0.1%) was used by selecting it with a sieve 4 of 5 mm.

The ordinary shirasu was classified into a heavy specific gravity component, a light specific gravity component, a dust collection component, and a perforated plate drop component by an air table type specific gravity difference sorting device 21. The working conditions are as follows: supply speed of ordinary shirasu is 240kg / h, hole diameter of perforated plate is 1mm (1mm mesh), amplitude of vibration by vibration device is ± 5mm, rotation speed of eccentric crank to vibrate is 495rpm, flow rate of blower fan Was 37 m ³ / min, and the tilt of the perforated plate was 12.5 °. Further, the upper surface of the porous plate 21a has a sawtooth-like unevenness in cross section, and the height difference of the unevenness is 5 mm.

The heavy specific gravity of the specific gravity difference sorting device 21 was discharged from the discharge port 21 c and recovered as it was. The weight percentage of heavy specific gravity with a density of 2.50 g / cm ³ or more relative to ordinary shirasu before being charged into the dry separation apparatus was 0.6%. Further, the portion dropped from the porous plate 21a was discharged from the discharge port 21f and added to the heavy specific gravity. The content of the particles dropped from the porous plate 21a was 19.3% by mass at a density of 2.50 g / cm ³ or more based on ordinary shirasu before being introduced into the dry separation device. The mass percentage of the heavy specific gravity D obtained by combining the heavy specific gravity component with the porous plate falling component was 19.9% with respect to the ordinary shirasu before being introduced into the dry separation device. This means that the yield of coarse particles having a density of 2.50 g / cm ³ or more usable for fine aggregate was 19.9%.

  The light specific gravity of the specific gravity difference sorting device 21 was discharged from the discharge port 21 d. The mass percentage of light specific gravity to ordinary shirasu before being introduced into the dry separation apparatus was 35.8%. The light specific gravity component was sieved to a sieve 23 into a sieve E1 and a sieve E2. The sieve mesh was 300 μm.

The portion E1 on the sieve had a density of 1.43 g / cm ³ . The percentage by mass of the portion E1 on the sieve relative to the ordinary shirasu before being introduced into the dry separation apparatus was 7.6%.
In addition, the portion E2 below the sieve had a density of 2.33 g / cm ³ . The percentage by mass of the portion E2 below the sieve relative to the ordinary shirasu before being introduced into the dry separation apparatus was 28.2%.

The dust collected in the specific gravity difference sorting device 21 was discharged from the discharge port 21 e. The dust collection portion was classified by the cyclone classifier 22 through the pipe line 7A, and the overflow fraction was led to the bag filter 16 through the pipe line 7I to recover the fine powder F. The cyclone recovery of the underflow portion of the cyclone classifier 22 was added to the sieve E2. The fine powder F had a density of 2.41 g / cm ³ . The mass percentage of the fine powder F to common shirasu before being charged into the dry separation apparatus was 40.9%.

  In addition, even if the mass percentage of the heavy specific gravity D, the mass percentage of the part E1 on the sieve, the mass percentage of the part E2 below the sieve, and the mass percentage of the fine powder F do not reach 100%, Because 3.4% remained in the

(Example 2)
In the apparatus and method of the fourth embodiment shown in FIG. 9, dried ordinary Shirasu, which is a raw material volcanic deposit sediment mineral, dried Hirara Shirasu produced in Aira-cho, Kanoya city, Kagoshima prefecture, for 24 hours at 105 ° C. (Water content of 0.1%) was used by selecting it with a sieve 4 of 5 mm.

The ordinary shirasu was classified into a heavy specific gravity component, a light specific gravity component, a dust collection component, and a perforated plate drop component by the first stage specific gravity difference sorting device 21A. The working conditions are as follows: supply speed of ordinary shirasu is 355 kg / h, hole diameter of perforated plate is 1 mm (1 mm mesh), amplitude of vibration by vibration device is ± 5 mm, rotation speed of eccentric crank to vibrate is 505 rpm, flow rate of blower fan Was 36 m ³ / min, and the inclination of the perforated plate was 13.5 °. Further, the upper surface of the porous plate 21a has a concavo-convex having a sawtooth-like cross section, and the height difference of the concavities and convexities is 7 mm.

The heavy specific gravity of the specific gravity difference sorting device 21A was discharged from the discharge port 21c and collected as it was. The weight percentage of heavy specific gravity of 2.50 g / cm ³ or more relative to ordinary shirasu before being introduced into the dry separation apparatus was 6.1%.

  The light specific gravity of the specific gravity difference sorting device 21A was discharged from the discharge port 21d. The mass percentage of light specific gravity to ordinary shirasu before being introduced into the dry separation apparatus was 22.9%. The light specific gravity was passed through a belt conveyor 6 and a belt feeder 9 and a sieve 23 was sieved into a sieve E1 and a sieve E2. The sieve mesh was 300 μm.

The dust collected in the specific gravity difference sorting device 21A was discharged from the discharge port 21e. The dust collection portion was classified by the cyclone classifier 22 through the pipe line 7A, and the overflow fraction was led to the bag filter 16 through the pipe line 7I to recover the fine powder F. The underflow of the cyclone classifier 22 was added to the sieve E2. The fine powder F had a density of 2.40 g / cm ³ . The mass percentage of the fine powder F with respect to ordinary shirasu before being charged into the dry separation apparatus was 17.9%.
The amount of falling of the perforated plate of the specific gravity difference sorting device 21A was discharged from the discharge port 21f. The mass percentage of the porous plate drop to ordinary shirasu before being introduced into the dry separation apparatus was 43.1%.
Here, 10.0% of the coarse particles supplied to the specific gravity difference sorting device 21A remained in the specific gravity difference sorting device 21A.

The portion dropped from the perforated plate 21a is supplied to the second stage specific gravity difference sorting device 21B via the belt feeder 8, and the heavy specific gravity fraction and the light specific gravity fraction are detected by the second stage specific gravity difference sorting device 21B, The collected dust and the perforated plate were separated. Working conditions are: a material wire (perforated plate falling part) supply speed of 153 kg / h, metal mesh with metal plate with a hole diameter of 105 μm (150 mesh) of perforated plate, amplitude of vibration by vibration device ± 5 mm, eccentricity to vibrate The rotational speed of the crank was 493 rpm, the flow rate of the blower fan was 28 m ³ / min, and the inclination of the perforated plate was 9 °.

The heavy specific gravity component of the specific gravity difference sorting device 21B is added to the heavy specific gravity component D discharged from the discharge port 21c and sorted by the first stage specific gravity difference sorting device 21A. The mass percentage of the heavy specific gravity of the specific gravity difference sorting device 21B with respect to 100% of the porous plate drop supplied to the specific gravity difference sorting device 21B was 54.8%.
The light specific gravity of the specific gravity difference sorting device 21B was discharged from the discharge port 21d. The mass percentage of the light specific gravity to the porous plate falling portion 100% supplied to the specific gravity difference sorting device 21B was 11.4%.
The light specific gravity component is discharged from the discharge port 21d, and the light specific gravity component with the first stage via the belt feeder 9 is subjected to the sieving 23 to screen the screen E1 and the screen E2. The sieve mesh was 300 μm.
The dust collected in the specific gravity difference sorting device 21B was discharged from the discharge port 21e. The dust collection portion was classified by the cyclone classifier 22 through the pipe line 7B, and then the overflow fraction was led to the bag filter 16 through the pipe line 7I to recover the fine powder F. The mass percentage of the fine powder F with respect to 100% of the porous plate drop supplied to the specific gravity difference sorting device 21B was 15.6%.
The underflow of the cyclone classifier 22 was added to the sieve E2. The amount of falling of the perforated plate of the second stage specific gravity difference sorting device 21B is discharged from the discharge port 21f and added to the lower screen E2. The mass percentage of the porous plate drop portion of the specific gravity difference sorting device 21B with respect to 100% of the porous plate drop portion supplied to the specific gravity difference sorting device 21B was 0.3%.
In addition, 17.9% remained in the specific gravity difference sorting device 21B with respect to 100% of the porous plate drop supplied to the specific gravity difference sorting device 21B.

The density of heavy specific gravity D obtained by combining the heavy specific gravity of the first stage specific gravity difference sorting device 21A and the heavy specific gravity fraction of the second stage specific gravity difference sorting device 21B was 2.53 g / cm ³ . The mass percentage of heavy specific gravity D having a specific gravity of 2.50 g / cm ³ or more relative to ordinary shirasu before being introduced into the dry separation apparatus was 29.8%. This means that the yield of the heavy specific gravity component having a specific gravity of 2.50 g / cm ³ or more which can be used for the fine aggregate was 29.8%.

The part E1 on the sieve had a density of 1.44 g / cm ³ . The weight percentage of the portion E1 on the screen to the ordinary shirasu before being introduced into the dry separation apparatus was 8.8%.
Moreover, the part E2 under the sieve had a density of 2.29 g / cm ³ . The percentage by mass of the portion E2 under the sieve relative to the common shirazu before being introduced into the dry separation apparatus was 19.0%.

The fine powder F had a density of 2.40 g / cm ³ . The mass percentage of the fine powder F with respect to ordinary shirasu before being charged into the dry separation apparatus was 24.7%.
In addition, even if the mass percentage of the heavy specific gravity D, the mass percentage of the part E1 on the sieve, the mass percentage of the part E2 below the sieve, and the mass percentage of the fine powder F do not reach 100%, Because 17.7% remained.

(Example 3)
Using the apparatus and method of the eighth embodiment shown in FIG. 13, the ordinary shirasu, which is a raw material volcanic deposit sediment mineral, is an aira shiras (water content 4.7%) produced in Aira-cho, Kanoya city, Kagoshima prefecture. The one separated by a sieve 4 of 5 mm was used. The density was 2.37 g / cm ³ under a 5 mm sieve of Aira Shirasu, which is ordinary shiras.

  When a part of aira shiras sorted out with the sieve 4 is charged from the inlet of the cyclone crusher 11A at a charging rate of 65.0 kg / h, suction at the pipes 17A to 17I caused by the exhaust blower 18 at the inlet. The power was working, and it was possible to smoothly feed a large amount of raw materials without clogging. Here, the gap between the flange joints of the opening 12a was 0 mm, and the gap between the flange joints of the opening 15a was 0.8 mm.

Normally, Shirasu collected coarse particles A with a cyclone classifier 12. Except coarse particles, they were sent to the cyclone classifier 15 through the cyclone classifiers 12, 13, 14 and the conduits 17D to 17H. Fine particles B were collected in the cyclone classifier 15. The fine powder other than the fine particles B was conveyed to the air flow, and the fine powder C was recovered in the bag filter 16 through the pipe line 17I. The carrier air flow that has passed through the filter cloth of the bag filter 16 is exhausted by the exhaust blower 18.
The recovery of coarse particles A was 71.2%, the recovery of fine particles B was 18.9%, and the recovery of fine particles C was 9.9%. Fine particles B are combined with the light specific gravity component in a two-stage air table type specific gravity difference sorting device through a belt feeder 9 and sorted with a sieve 23 of 300 μm. The percentage of sieving sorting by sieving 23 only for 18.9% of fine grain B is that the recovery rate of pumice with a grain size of 0.3 mm or more is 2.5% and that of volcanic glass with a grain size of 0.3 mm or less The recovery rate was 16.4%.

The coarse particles A were separated from the heavy specific gravity component, the light specific gravity component, the dust collection component, and the perforated plate drop component by the first stage specific gravity difference sorting device 21A. The working conditions are as follows: the feed speed of coarse particle A is 300 kg / h, the hole diameter of the perforated plate is 1 mm (1 mm mesh), the amplitude of vibration by the vibration device is ± 5 mm, the rotation speed of eccentric crank to vibrate is 505 rpm, and the flow rate of blower fan Was 28 m ³ / min, and the inclination of the perforated plate was 13 °. Further, the upper surface of the porous plate 21a has a concavo-convex having a sawtooth-like cross section, and the height difference of the concavities and convexities is 7 mm.

  The heavy specific gravity of the specific gravity difference sorting device 21A was discharged from the discharge port 21c and collected as it was. The mass percentage of the heavy specific gravity to the coarse particles supplied to the specific gravity difference selector 21A was 10.4%.

  The light specific gravity of the specific gravity difference sorting device 21A was discharged from the discharge port 21d. The mass percentage of the light specific gravity component to the coarse particles supplied to the specific gravity difference sorting device 21A was 18.4%. The light specific gravity was passed through a belt conveyor 6 and a belt feeder 9 and a sieve 23 was sieved into a sieve E1 and a sieve E2. The sieve mesh was 300 μm.

The dust collected in the specific gravity difference sorting device 21A was discharged from the discharge port 21e. The dust collection portion was classified by the cyclone classifier 22 through the pipe line 7A, and then the overflow was guided to the bag filter 16 through the pipe line 7C to recover the fine powder F. The underflow of the cyclone classifier 22 was added to the sieve E2. The fine powder F had a density of 2.46 g / cm ³ . The mass percentage of the fine powder F with respect to the coarse particles A supplied to the specific gravity difference sorting device 21A was 14.0%.

The amount of falling of the perforated plate of the specific gravity difference sorting device 21A was discharged from the discharge port 21f. The mass percentage of the porous plate drop with respect to the coarse particles A supplied to the specific gravity difference sorting device 21A was 46.4%.
In addition, 10.8% remained in the specific gravity difference sorting device 21A with respect to the coarse particles A supplied to the specific gravity difference sorting device 21A.

The portion dropped from the perforated plate 21a is supplied to the second stage specific gravity difference sorting device 21B via the belt feeder 8, and the heavy specific gravity fraction and the light specific gravity fraction are detected by the second stage specific gravity difference sorting device 21B, The collected dust and the perforated plate were separated. The working conditions are: a metal wire web with a feed rate of raw material (perforated plate drop) of 160 kg / h and a hole diameter of the perforated plate of 105 μm (150 mesh), amplitude of vibration by the vibration device ± 5 mm, eccentricity to vibrate The rotational speed of the crank was 493 rpm, the flow rate of the blower fan was 28 m ³ / min, and the inclination of the perforated plate was 9 °.

The heavy specific gravity component of the specific gravity difference sorting device 21B is discharged from the discharge port 21c and added to the heavy specific gravity component D of the first stage specific gravity difference sorting device 21A. The mass percentage of heavy specific gravity of the specific gravity difference sorting device 21B with respect to 100% of the porous plate falling portion supplied to the specific gravity difference sorting device 21B was 73.1%.
The light specific gravity of the specific gravity difference sorting device 21B was discharged from the discharge port 21d. The mass percentage of the light specific gravity to the porous plate falling portion 100% supplied to the specific gravity difference sorting device 21B was 6.3%.
The light specific gravity component is discharged from the discharge port 21d, and the fine specific gravity from the cyclone classifier 15 via the belt feeder 9 and the light specific gravity component of the first stage are applied to the sieve 23 and sieved on the sieve E1 and the sieve E2. The sieve mesh was 300 μm.
The dust collected in the specific gravity difference sorting device 21B was discharged from the discharge port 21e. The dust collection portion was classified by the cyclone classifier 22 through the pipe line 7B, and the overflow was guided to the bag filter 16 through the pipe line 7C and recovered. The mass percentage of the fine powder F with respect to 100% of the porous plate drop supplied to the specific gravity difference sorting device 21B was 4.5%.
The underflow of the cyclone classifier 22 was added to the sieve E2. The amount of falling of the perforated plate of the second stage specific gravity difference sorting device 21B is discharged from the discharge port 21f and added to the lower screen E2. The percentage by mass of the porous plate drop of the specific gravity difference sorting device 21B with respect to 100% of the porous plate falling fraction supplied to the specific gravity difference sorting device 21B was 0.8%.
In addition, 15.3% remained in the specific gravity difference sorting device 21B with respect to 100% of the porous plate drop supplied to the specific gravity difference sorting device 21B.
The mass percentage of heavy specific gravity of the specific gravity difference sorting device 21B with respect to 100% of the porous plate falling portion supplied to the specific gravity difference sorting device 21B was 73.1%.

The weight percentage of the heavy specific gravity D obtained by combining the heavy specific gravity of the first stage specific gravity difference sorting device 21A and the heavy specific gravity fraction of the second stage specific gravity difference sorting device 21B on the coarse particles A collected by the cyclone classifier 12 is 44 .3%.
The weight percentage of fine particles A collected by the cyclone classifier 12 to 100% of the fine granules from the cyclone classifier 15, the light specific gravity component of the first stage, and the light specific gravity component of the second stage is 8 .2%.
The weight percentage of the fine particle E collected by the cyclone classifier 12 with respect to 100%, the weight ratio of the fine granules from the cyclone classifier 15, the first stage light specific gravity component and the second stage light relative gravity component E2 is 13 It was 1%.
The mass percentage of the fine powder F recovered by the bag filter 16 was 16.1% based on 100% of the coarse particles A recovered by the cyclone classifier 12.
The percentage by mass of the total remaining in the first stage specific gravity difference sorting apparatus 21A and the second stage specific gravity difference sorting apparatus 21B with respect to 100% of coarse particles A collected by the cyclone classifier 12 is 18.3%. The

The density of heavy specific gravity D obtained by combining the heavy specific gravity of the first stage specific gravity difference sorting device 21A and the heavy specific gravity fraction of the second stage specific gravity difference sorting device 21B was 2.53 g / cm ³ . The mass percentage of heavy specific gravity D having a specific gravity of 2.50 g / cm ³ or more relative to ordinary shirasu before being introduced into the dry separation apparatus was 31.6%. This means that the yield of heavy specific gravity with a specific gravity of 2.50 g / cm ³ or more that can be used for fine aggregate is 31.6%, and the water content of the input shirasu raw material is 4.7%, etc. Although the raw material contained a large amount of water as compared with, the yield was the best compared to the other examples.

The density of the heavy specific gravity fraction D is 2.53 g / cm ^3, it was greater than 2.50 g / cm ^3. The water absorption rate according to JIS A1109 was 1.85%. The mass fraction of the heavy specific gravity component D obtained according to Example 3 passing through the sieve is shown in the graph of FIG. The heavy specific gravity component obtained in the present example was included in the range of the standard particle size distribution defined by "sand" of JIS A5308. From these characteristics, it was found that the high specific gravity component is suitable as a fine aggregate.

The part E1 on the sieve had a density of 1.45 g / cm ³ . The percentage by mass of the portion E1 on the sieve relative to the ordinary shirasu before being introduced into the dry separation apparatus was 8.4%.
In addition, the portion E2 below the sieve had a density of 2.33 g / cm ³ . The weight percentage of the portion E2 under the screen to the ordinary shirasu before being charged into the dry separation apparatus was 37.1%.

The fine powder F had a specific gravity of 2.46 g / cm ³ . The mass percentage of the fine powder F to common shirasu before being charged into the dry separation apparatus was 9.9%.

In addition, even if the mass percentage of the heavy specific gravity D, the mass percentage of the part E1 on the sieve, the mass percentage of the part E2 below the sieve, and the mass percentage of the fine powder F do not reach 100%, Because 13.0% remained. The ratio remaining in this device is the value when working with an unused air flow classification device, an unused first stage specific gravity difference sorting device 21A, and an unused second stage specific gravity difference sorting device 21B for the first time. Since the amount remaining in each of these devices is constant, since a constant amount already remains in the device except when first used, subtraction from ordinary shirasu supplied to the device does not cause any problem.
The raw materials, working conditions and separation results of Reference Examples 1 to 2 and Examples 1 to 3 are shown in Tables 1 and 2.

(Examples 4 to 9)
The strength of the mixed cement obtained by mixing the fine powder F obtained in Example 3 and the fine powder F2 obtained by further grinding the fine powder F into ordinary Portland cement was measured.
The fine powder F had an average particle size of 0.033 mm. The ground fine powder F2 was obtained by grinding the fine powder F supplied at 4.4 kg / h by means of a central chemical machine model BMC-15 vibrating mill and having a mean particle diameter of 0.012 mm.

  As a comparative example, 45 g of a cement material having a weight ratio of ordinary portland cement, standard sand and water of 1: 3: 1 was prepared. As Examples 4-9, what (the sample of each 45g) using above-mentioned fine powder F and / or ground fine powder F2 as a raw material of mixed cement was prepared.

In Comparative Example and Examples 4 to 9, the raw materials were mixed by a paste mixer. The paste mixer was UM102 manufactured by Japan Unix Corporation. As mixing conditions, alumina balls with a diameter of 8 mm were introduced as a mixing medium, and kneading was performed for 30 seconds at a rotational speed of 2000 rpm.
After mixing, each sample of fresh mortar was temperature-measured with a non-contact infrared thermometer. Thereafter, oil was poured into three thin 2 cm square plastic molds and molded.
After molding, the mixture was allowed to pass for 4 weeks in a saturated water vapor desiccator, dried at room temperature, and after 3 days, removed from the plastic mold and left at room temperature. Thereafter, end face finish processing was performed to prepare a sample for compression test, and the compression test was performed.
The compositions of the comparative example and Examples 4 to 9 and the results of the compression tests are shown in Table 3. Further, FIG. 15 shows the compression results in a bar graph.

  From Table 3 and FIG. 15, the compressive strength was improved by adding the fine powder F and / or the pulverized fine powder F2. The compressive strength of the pulverized fine powder F2 obtained by pulverizing the fine powder F is more improved than the fine powder F obtained by the classification of the present invention. A mortar using a mixed cement in which fine powder F and ground fine powder F 2 were mixed in equal amounts by ordinary portland cement developed the maximum average compressive strength.

(Example 10)
Using the apparatus and method of the third embodiment shown in FIG. 8, the ordinary shirasu, which is a raw material volcanic deposit sediment mineral, is an aira shiras (water content 5.7%) produced in Aira-cho, Kanoya city, Kagoshima prefecture. The one separated by a sieve 4 of 5 mm was used.

The ordinary shirasu was classified into a heavy specific gravity component, a light specific gravity component, a dust collection component, and a perforated plate drop component by the first stage specific gravity difference sorting device 21D. The operating conditions are as follows: rotation speed of eccentric crank to be vibrated, with normal shirasu feeding speed of 93.4 kg / h, hole diameter of perforated plate 1 mm (round roulette triangle with 1 mm side of one side), vibration amplitude by vibration device ± 5 mm The speed was 304 rpm, the flow rate of the blower fan was 16 m ³ / min, and the tilt of the perforated plate was 12.6 °. Further, the upper surface of the porous plate 21a has a sawtooth-like unevenness in cross section, and the height difference of the unevenness is 10 mm.

The heavy specific gravity of the specific gravity difference sorting device 21D was discharged from 21c and recovered. The weight percentage of heavy specific gravity was 11.9%, the density was 2.62 g / cm ³ , and the water content was 0.3%. The perforated plate dropped from 21f had a mass percentage of 20.9%, a density of 2.52 g / cm ³ , and a moisture content of 0.5%. Since this perforated plate falling part satisfies the density 2.5 g / cm ³ or more specified by “sand” of JIS A5308, it could be used as fine aggregate as it is. The mass percentage of the fine aggregate obtained by combining the heavy specific gravity component and the porous plate falling component was 32.8%.

The light specific gravity of the specific gravity difference sorting device 21D was discharged from 21d. The mass percentage of light specific gravity was 19.2%, the density was 1.54 g / cm ³ , and the moisture content was 0.9%.

The dust collected in the specific gravity difference sorting device 21D was discharged from 21e. The dust collection portion was classified by the cyclone classifier 22 through the pipe line 7A, and the overflow fraction was led to the bag filter 16 through the pipe line 7I to recover the fine powder F. The mass percentage of the underflow portion of the cyclone classifier 22 was 46.2%, the density was 2.35 g / cm ³ , and the moisture content was 0.3%.
The mass percentage of the fine powder F recovered by the bag filter 16 was 1.8%, the density was 2.37 g / cm ³ , and the moisture content was 3.5%.

  In addition, before performing sampling of specific gravity separation, after carrying out preliminary | backup operation until it reached an equilibrium state on the same specific gravity separation conditions as the same Shirasu raw material, the Shirasu raw material supply for measurement was started. This is because the bed layer of several cm thick consisting of the fine aggregate equivalent remaining on the porous plate 21a is formed in advance before the addition of the shirasu raw material for measurement, so that the separation from the beginning of the shirasu raw material introduction The purpose was to improve the efficiency and to minimize the loss of the residual in the device which is the difference between the input amount and the recovery amount.

(Example 11)
Using the apparatus and method of the fourth embodiment shown in FIG. 10, the ordinary shirasu, which is a raw material volcanic deposit sediment mineral, is an aira shiras (water content 5.7%) produced in Hira-machi, Kanoya city, Kagoshima prefecture. The one separated by a sieve 4 of 5 mm was used.

The ordinary shirasu was classified into a heavy specific gravity component, a light specific gravity component, a dust collection component, and a perforated plate drop component by the first stage specific gravity difference sorting device 21D. The operating conditions are as follows: rotation speed of eccentric crank to be vibrated with normal shirasu feeding speed of 96.9 kg / h, hole diameter of perforated plate 1 mm (round roulette triangle with 1 mm side of one side), vibration amplitude by vibration device ± 5 mm The speed was 304 rpm, the flow rate of the blower fan was 12 m ³ / min, and the tilt of the perforated plate was 12.6 °. Further, the upper surface of the porous plate 21a has a sawtooth-like unevenness in cross section, and the height difference of the unevenness is 10 mm.

The heavy specific gravity of the specific gravity difference sorting device 21D was discharged from 21c and recovered. The mass percentage of heavy specific gravity was 17.8%, the density was 2.54 g / cm ³ , and the moisture content was 0.9%.

The light specific gravity of the specific gravity difference sorting device 21D was discharged from 21d. The mass percentage of light specific gravity was 8.6%, the density was 1.38 g / cm ³ , and the moisture content was 1.3%. The light specific gravity component conforms to the standard of JIS A5002 "Lightweight Concrete Aggregate for Structure".

The dust collected in the specific gravity difference sorting device 21D was discharged from 21e. The dust collected was classified by the cyclone classifier 22A through the pipe line 7A, and then the overflow was guided to the bag filter 16A through the pipe line 7I to recover the fine powder F. The mass percentage of the underflow portion of the cyclone classifier 22A was 45.5%, the density was 2.31 g / cm ³ , and the moisture content was 0.6%.
The mass percentage of the fine powder F recovered by the bag filter 16A was 1.9%, the density was 2.36 g / cm ³ , and the water content was 3.5%.
In addition, before performing sampling of specific gravity separation, after carrying out preliminary | backup operation until it reached an equilibrium state on the same specific gravity separation conditions as the same Shirasu raw material, the Shirasu raw material supply for measurement was started. This is for the same reason as described in Example 10.

The percentage of the porous plate dropped out of the outlet 21 f was 26.2% by mass, the density was 2.36 g / cm ³ , and the moisture content was 0.7%.
The perforated plate falling portion is supplied to the second stage specific gravity difference sorting device 21E via the belt feeder 5, and the second stage specific gravity difference sorting device 21E supplies the heavy specific gravity portion, the perforated plate falling portion and the light The specific gravity portion and the dust collection portion (cyclone collected, bag filter collected) were sorted. Working conditions are: a metal wire woven fabric with a feed rate of 23.9 kg / h for the raw material (droplet for perforated plate) and a hole diameter of 105 μm (150 mesh) for the perforated plate, the amplitude of vibration by the vibration device is ± 5 mm, vibration The rotation speed of the eccentric crank to be made was 303 rpm, the flow rate of the blower fan was 39 m ³ / min, and the inclination of the porous plate was 10.8 °.

The heavy specific gravity component of the specific gravity difference sorting device 21E was discharged from 21c and added to the heavy specific gravity component D sorted by the first stage specific gravity difference sorting device 21D. The mass percentage of this heavy specific gravity was 44.6%. The light specific gravity of the specific gravity difference selector 21E was discharged from 21d. The mass percentage of light specific gravity was 52.6%, the density was 1.79 g / cm ³ , and the water content was 0.5%. The light specific gravity component conforms to the standard of JIS A5002 "Lightweight Concrete Aggregate for Structure".
The dust collected in the specific gravity difference sorting device 21E was discharged from 21e. The dust collection portion was classified by the cyclone classifier 22B through the pipe line 7B, and then the overflow was guided to the bag filter 16B through the pipe line 7D to recover the fine powder F. The cyclone recovery separated by the cyclone classifier 22B was 1.9%. The mass percentage of the fine powder F was 0.8%.
The minute drop of the porous plate dropped from the porous plate 21a of the second stage specific gravity difference sorting device 21E was recovered and was 0.1%.

The weight percentage of the ordinary shirasu added to the first stage of heavy specific gravity D obtained by combining the heavy specific gravity of the first specific gravity difference sorting apparatus 21D and the heavy specific gravity of the second stage specific gravity difference sorting apparatus 21E is 29.5% Met. This means that the yield of fine aggregate with a specific gravity of 2.50 g / cm ³ or more was 29.5%.

The mass percentage to the ordinary shirasu input to the first stage of the light specific gravity component E1 was 22.4%. This means that the yield of lightweight aggregate was 22.4%.
Moreover, the mass percentage with respect to the common shirasu thrown into the 1st step of volcanic glass material fine grain E2 was 46.0%. This means that the yield of Shirasu balloon raw material or admixture raw material was 46.0%.

The mass percentage to the ordinary shirasu input to the first stage of the volcanic glass material fine powder F was 2.1%. This means that the yield of the admixture or mixed cement raw material was 2.1%.
(Example 12)
Using the apparatus and method of the sixth embodiment shown in FIG. 11, the ordinary shirasu, which is the raw material volcanic deposit sediment mineral, is the Shirashi (water content 5.5%) produced in Hira-machi, Kanoya city, Kagoshima prefecture. The one separated by a sieve 4 of 5 mm was used.

The ordinary shirasu was classified into a heavy specific gravity component, a light specific gravity component, a dust collection component, and a perforated plate drop component by the first stage specific gravity difference sorting device 21D. The operating conditions are as follows: rotation speed of eccentric crank to be vibrated, with normal shirasu feeding speed of 98.3 kg / h, hole diameter of perforated plate 1 mm (rounded loulos triangle with one side of 1 mm, amplitude of vibration by vibration device ± 5 mm) The speed was 304 rpm, the flow rate of the blower fan was 20 m ³ / min, and the inclination of the perforated plate was 12.6 °. Further, the upper surface of the porous plate 21a has a sawtooth-like unevenness in cross section, and the height difference of the unevenness is 10 mm.

The heavy specific gravity of the specific gravity difference sorting device 21D was discharged from 21c and recovered. The weight percentage of heavy specific gravity was 0.8%, and the density was 2.65 g / cm ³ . The perforated plate dropped from 21 f had a weight percentage of 7.9% and a density of 2.58 g / cm ³ . Since this perforated plate falling part satisfies the density 2.5 g / cm ³ or more specified by “sand” of JIS A5308, it could be used as fine aggregate as it is.

The dust collected in the specific gravity difference sorting device 21D was discharged from 21e. The dust collected was classified by the cyclone classifier 22A through the pipe line 7A, and then the overflow was guided to the bag filter 16A through the pipe line 7I to recover the fine powder F. The mass percentage of the recovered cyclone, which is the underflow of the cyclone classifier 22A, was 60.5%, and the density was 2.36 g / cm ³ .
The mass percentage of the fine powder F recovered by the bag filter 16A was 1.9%.
In addition, before performing sampling of specific gravity separation, after carrying out preliminary | backup operation until it reached an equilibrium state on the same specific gravity separation conditions as the same Shirasu raw material, the Shirasu raw material supply for measurement was started. This is for the same reason as described in Example 10.

The light specific gravity of the specific gravity difference sorting device 21D was discharged from 21d. The mass percentage of light specific gravity was 28.9%, and the density was 1.94 g / cm ³ .

The light specific gravity component is supplied to the second stage specific gravity difference sorting device 21E via the belt feeder 5, and the heavy specific gravity fraction, the light specific gravity component and the perforated plate fall by the second stage specific gravity difference sorting device 21E. The mixture was sorted according to amount and dust collection (cyclone collection, bag filter collection). The operating conditions are as follows: the feed rate of the raw material (light specific gravity component) is 96.7 kg / h, the hole diameter of the perforated plate is 1 mm (round roulette triangle with 1 mm side of one side), and the vibration amplitude by the vibration device is ± 5 mm. The rotational speed of the eccentric crank was 304 rpm, the flow rate of the blower fan was 16 m ³ / min, and the inclination of the perforated plate was 12.6 °. Further, the upper surface of the porous plate 21a has a sawtooth-like unevenness in cross section, and the height difference of the unevenness is 10 mm.

The heavy specific gravity component of the specific gravity difference sorting device 21E was discharged from 21c and added to the heavy specific gravity component D sorted by the first stage specific gravity difference sorting device 21D. The mass percentage of this heavy specific gravity was 44.2%. The light specific gravity of the specific gravity difference selector 21E was discharged from 21d. The mass percentage of light specific gravity was 45.7%, and the density was 1.73 g / cm ³ .
The dust collected in the specific gravity difference sorting device 21E was discharged from 21e. The dust collection portion was classified by the cyclone classifier 22B through the pipe line 7B, and then the overflow was guided to the bag filter 16B through the pipe line 7D to recover the fine powder F. The recovered amount of the cyclone separated by the cyclone classifier 22B was 1.2%. The mass percentage of the fine powder F was 0.4%.
The mass percentage of the porous plate falling portion dropped from the porous plate 21a of the second stage specific gravity difference sorting device 21E was 8.5%, and the density was 2.67 g / cm ³ .

Ordinary loaded at the first stage of heavy specific gravity D which is the combination of heavy specific gravity of the first stage specific gravity difference sorting device 21D and the falling part of the perforated plate and heavy specific gravity part of the second stage specific gravity difference sorting apparatus 21E and the falling plate of the porous plate The mass percentage to Shiras was 24.0%. This means that the yield of fine aggregate with a specific gravity of 2.50 g / cm ³ or more was 24.0%.

The mass percentage of the ordinary shirasu charged in the first stage of the light specific gravity component E1 of the second stage specific gravity difference sorting device 21E was 13.2%. This means that the yield of lightweight aggregate was 13.2%.
Moreover, the mass percentage with respect to the common shirasu thrown into the 1st step of volcanic glass material fine grain E2 was 60.8%.

  The mass percentage to the ordinary shirasu input to the first stage of the fine powder of volcanic glass material F was 2.0%. This means that the yield of the admixture or mixed cement raw material was 2.0%.

(Example 13)
In the apparatus and method of the seventh embodiment shown in FIG. 12, as ordinary shirasu, which is a raw material volcanic deposit sediment mineral, air dried shirasu produced in Aira-cho, Kanoya-shi, Kagoshima, has been indoor-dried (water content 1 .6%) was screened using a sieve 4 with a mesh size of 5 mm.

The ordinary shirasu was classified into a heavy specific gravity component, a light specific gravity component, a dust collection component, and a perforated plate drop component by the first stage specific gravity difference sorting device 21D. The working conditions are: 103 kg / h of ordinary shirasu feed rate, 1 mm of hole diameter of perforated plate (round roulette triangle with 1 mm side of one side), ± 5 mm amplitude of vibration by the vibration device, rotation speed of eccentric crank to vibrate 304 rpm, the flow rate of the blower fan was 16 m ³ / min, and the inclination of the perforated plate was 12.6 °. Further, the upper surface of the porous plate 21a has a sawtooth-like unevenness in cross section, and the height difference of the unevenness is 10 mm.
Here, the capacity of the exhaust blower was enhanced to set the amount of air drawn from the pipe 7A to 120 m ³ / min, which is higher than that of the tenth embodiment, to improve the recovery rate of the cyclone collected matter.

The heavy specific gravity of the specific gravity difference sorting device 21D was discharged from 21c and recovered. The mass percentage of heavy specific gravity was 0.4%, and the density was 2.69 g / cm ³ . The perforated plate dropped from 21f had a mass percentage of 11.1% and a density of 2.64 g / cm ³ . Since this perforated plate falling part satisfies the density 2.5 g / cm ³ or more specified by “sand” of JIS A5308, it could be used as fine aggregate as it is.

  The light specific gravity of the specific gravity difference sorting device 21D was discharged from 21d. The mass percentage of light specific gravity was 11.8%.

The dust collected in the specific gravity difference sorting device 21D was discharged from 21e. The dust collected was classified by the cyclone classifier 22A through the pipe line 7A, and then the overflow was guided to the bag filter 16A through the pipe line 7I to recover the fine powder F. The mass percentage of the recovered cyclone, which is the underflow of the cyclone classifier 22A, was 73.8%, and the density was 2.32 g / cm ³ .
The mass recovery rate of the fine powder F recovered by the bag filter 16A was 2.9%, and the density was 2.38 g / cm ³ .
In addition, before performing sampling of specific gravity separation, after carrying out preliminary | backup operation until it reached an equilibrium state on the same specific gravity separation conditions as the same Shirasu raw material, the Shirasu raw material supply for measurement was started. This is for the same reason as described in Example 10.

The cyclone collection portion, which is the underflow portion of the cyclone classifier 22A, includes a pumice fraction of 0.3 mm or more, and the cyclone collection portion is separated by the specific gravity difference selection of the second stage via the belt feeder 5 It was supplied to the apparatus 21E, and the second stage specific gravity difference sorting apparatus 21E sorted the heavy specific gravity component, the porous plate falling component, the light specific gravity component, and the dust collection component (cyclone recovered component, bag filter recovered component) . Working conditions are: a metal wire mesh with a feed rate of 21.8 kg / h for the raw material (cyclone recovered) and a hole diameter of 105 μm (150 mesh) of the perforated plate, the vibration amplitude by the vibration device is ± 5 mm, vibrate The rotational speed of the eccentric crank was 303 rpm, the flow rate of the blower fan was 39 m ³ / min, and the inclination of the porous plate was 10.8 °.

The heavy specific gravity component of the specific gravity difference sorting device 21E was discharged from 21c and added to the heavy specific gravity component D sorted by the first stage specific gravity difference sorting device 21D. The mass percentage of this heavy specific gravity was 5.1%. The light specific gravity of the specific gravity difference selector 21E was discharged from 21d. The mass percentage of light specific gravity was 31.3%.
The dust collected in the specific gravity difference sorting device 21E was discharged from 21e. The dust collection portion was classified by the cyclone classifier 22B through the pipe line 7B, and then the overflow was guided to the bag filter 16B through the pipe line 7D to recover the fine powder F. The recovered amount of the cyclone separated as the underflow portion of the cyclone classifier 22B was 60.2% and the density was 2.35 g / cm ³ . The mass percentage of the fine powder F was 3.4%.
A minute drop of the porous plate dropped from the porous plate 21a of the second stage specific gravity difference sorting device 21E was recovered and was less than 0.05%.

  The mass percentage of the ordinary shirasu input to the first stage of the fine fine particles of volcanic glass material E2 collected by the second stage cyclone classifier 22B was 44.4%. This means that the yield of Shirasu balloon raw material or admixture raw material was 44.4%.

The mass percentage to the ordinary shirasu input to the first stage of the fine powder of volcanic glass material F was 2.9%. This means that the yield of the admixture or mixed cement raw material was 2.9%.
The raw material supply amounts and the separation results of Examples 10 to 13 are shown in Table 4.

(Examples 14 to 16)
The finely divided powder F3 obtained in Example 10, the finely pulverized powder F4 obtained by further crushing the fine fine particles of volcanic glass material E2 obtained in Example 10, and the finely divided powder F obtained in Example 3 are further pulverized. The strength of the mixed cement obtained by mixing the pulverized fine powder F5 obtained as described above with ordinary Portland cement was measured.
The fine powder F3 had an average particle size of 0.0041 mm. The ground fine powder F4 was obtained by grinding the fine powder F3 supplied at 5 kg / h by means of an IHI-made IS-150 roller mill and having an average particle diameter of 0.0051 mm. Pulverized fine powder F5 was obtained by pulverizing fine powder F obtained in Example 3 by supplying 5 kg / h to a DSF-2 type JET mill made by Nippon Pneumatic Mfg., And having an average particle diameter of 0.0011 mm. .

  As Comparative Example 2, 60 g of a cement material having a weight ratio of 1: 1.4: 0.6 of ordinary portland cement manufactured by Ube-Mitsubishi Cement and standard sand and water was prepared. What (60g of each sample) using said fine powder F3 or the pulverized fine powder F4 or the pulverized fine powder F5 as a raw material of mixed cement was prepared as Examples 14-16.

In Comparative Example 2 and Examples 14 to 16, the raw materials were mixed by a paste mixer. The paste mixer was UM102 manufactured by Japan Unix Corporation. As mixing conditions, alumina balls with a diameter of 8 mm were introduced as a mixing medium, and kneading was performed for 30 seconds at a rotational speed of 2000 rpm.
After mixing, each sample of fresh mortar was temperature-measured with a non-contact infrared thermometer. Thereafter, oil was poured into three thin 2 cm square plastic molds and molded.
After molding, leave it for half a day in a saturated water vapor desiccator, leave it for 1 day after putting it on a wet cloth, remove it from the plastic mold after leaving it for 4 weeks in water, finish-finishing the sample for compression test Were prepared and subjected to a compression test. The results are shown in Table 5.

  Comparing the compressive strengths in which 10% of the ordinary portland cement in Table 5 is replaced with the fine powder F3 or the pulverized fine powder F4 or the pulverized fine powder F5, Example 14 has 10% less ordinary portland cement compared to the comparative example 2. The decrease in strength was 1.5 MPa, and the decrease was 0.3 MPa in Example 15 and 3.3 MPa in Example 16.

The compressive strength development rates of these admixtures to ordinary Portland cement were compared. Since Example 14 to Example 16 have a normal portland cement blending ratio of 90% as compared with Comparative Example 2, 50.85 MPa corresponding to 90% of 56.5 MPa is obtained as a compressive strength of 90% of normal portland cement. Base value. Moreover, compressive strength development effect per 10% of ordinary portland cement is set to 5.65 MPa which is 10% of 56.5 MPa.
The value obtained by subtracting the base value of 50.85 MPa from the compressive strength of Example 14 from Example 14 is divided by 5.65 MPa and taken as a percentage is taken as the compressive strength development ratio of the admixture to ordinary portland cement.

As a result, the compressive strength development rate is 73.5% for the fine powder F3, 94.7% for the pulverized fine powder F4, and 158.4% for the pulverized fine powder F5. The high-purity volcanic glass material of the present invention has a high strength expression rate by being crushed as an admixture to be used as a raw material of mixed cement, and when crushed to an average particle diameter of about 0.001 mm, it largely exceeds ordinary Portland cement. It showed a strong expression rate.
Moreover, since these admixtures of the present invention do not have self-hardening unlike ordinary Portland cement, they are considered to exhibit a pozzolanic effect and not only contribute to improvement of the four-week strength, but also long-term strength development and water resistance Excellent effects such as salt damage resistance and acid resistance can be expected.

(Example 17)
Fine particles of volcanic glass material E2 obtained in Example 10 had an average particle diameter of 0.0789 mm and a bulk specific gravity of 1.13. This volcanic glass material fine grain E2 was fired at 1050 ° C. with a raw material supply amount of 20 kg / h using mullite particles as a heat medium in a medium fluid bed furnace with a furnace inner diameter of 130 mm developed at the prefecture industrial technology center. As a result of separation and collection by a cyclone classifier directly connected to a furnace, a sintered foam having an average particle diameter of 0.0985 mm and a bulk specific gravity of 0.34 was obtained.

The heavy specific gravity component has a density of 2.5 g / cm ³ or more, and the particle size distribution is also a distribution conforming to the definition of “sand” in JIS A5308, and therefore, it can be used as a fine aggregate for concrete.
The sieve top is mainly made of pumice with a particle size of 0.3 mm or more, and can be used as a natural lightweight aggregate. If crushed, the volcanic glass material mainly composed of pumice with a particle diameter of 0.3 mm or more can be used as an additive having a pozzolanic effect or as a raw material of a mixed cement having a pozzolanic effect.
The lower portion of the sieve is mainly made of volcanic glass having a particle diameter of less than 0.3 mm and 0.05 mm or more, and can be used as a pearlite raw material or a shirasu balloon raw material. If crushed, it can be used as an additive having a pozzolanic effect or a mixed cement raw material having a pozzolanic effect. The fine powder is mainly made of volcanic glass with a particle size of less than 0.05 mm, and it becomes an additive having a better pozzolanic effect by being an additive or grinding, and it is a mixed cement in which the ground is mixed with portland cement. It can be used as a raw material.

The feature of the present invention is that it is possible to carry out specific gravity separation of undried or dried raw materials in which fine particles and coarse particles are mixed with difficulty in specific gravity separation at low cost, and pyroclastic flow deposits such as ordinary Shirasu, Kanuma soil and Kanoya soil. Other than volcanic deposits such as pumice fall deposits, natural deposits of volcanic products such as Kakuto Shirasu and Yoshida Shirasu, in addition to volcanic products sedimentary minerals widely distributed widely in the world, crushed stone, sand, soil as well as pearlite It is possible to carry out dry specific gravity separation of crushed and agglomerated natural and artificial materials such as obsidian, rosinite and limestone, and industrial wastes such as construction waste and concrete waste.
In addition, it is possible to separate the heat medium such as raw material or ceramics such as non-foamed volcanic glass or vermiculite contained in artificial fired foam such as perlite, shirasu balloon and vermiculite, and foreign matter such as rust, etc. It has become possible to refine high value-added fired foams.

3, 5, 8, 9 Belt feeders 6 Belt conveyors 4, 19, 23 sieves 7A to 7C, 7D, 7I pipeline 10 air flow classification device 11A to 11E cyclone crusher 12 to 15, 22, 31, 32 cyclone classifier 12a , 15a Opening 12b, 15b Opening and closing valve 16, 16A, 16B Bag filter 17A to 17O Pipeline 18 Exhaust blower 20 Rotary feeders 21, 21A, 21B, 21D, 21E Specific gravity difference sorting device 21a Perforated plate 21b Blower fan 21c, 21d, 21f 21e Discharge port 21g Vibrator 21h Wind tunnel 22, 22A, 22B Cyclone classifier A coarse particle B1 fine particle on sieve (pumice stone)
B2 Fine-grained sieve (volcanic glass)
C Fine powder D Heavy specific gravity component E1 Light specific gravity component on the sieve or light specific gravity component E2 Light specific gravity component under the sieve and / or cyclone collection component F Fine powder G, H, I Intake J Exhaust

Claims (7)

The specific gravity difference of the air table type which removes the fraction of particle size more than 5 mm from the volcanic ejecta deposit mineral and blows air from the lower side toward the porous plate while vibrating the porous plate which is inclined at a predetermined angle from the horizontal direction. Supply to the sorting device, and sort into the heavy specific gravity, the light specific gravity, the dust collection, and the perforated plate drop,
Fine aggregate characterized in that it is obtained by collecting fine aggregate from the sorted heavy specific gravity. The specific gravity difference of the air table type which removes the fraction of particle size more than 5 mm from the volcanic ejecta deposit mineral and blows air from the lower side toward the porous plate while vibrating the porous plate which is inclined at a predetermined angle from the horizontal direction. Supply to the sorting device, and sort into the heavy specific gravity, the light specific gravity, the dust collection, and the perforated plate drop,
Fine aggregate obtained by collecting fine aggregate from the sorted heavy specific gravity component and porous plate drop. The specific gravity difference of the air table type which removes the fraction of particle size more than 5 mm from the volcanic ejecta deposit mineral and blows air from the lower side toward the porous plate while vibrating the porous plate which is inclined at a predetermined angle from the horizontal direction. Supply to the sorting device, and sort into the heavy specific gravity, the light specific gravity, the dust collection, and the perforated plate drop,
A residual volcanic glass material obtained by separating fine aggregate from collected heavy specific gravity from collected heavy specific gravity or from fine plate and porous plate from falling, and having a particle size of 0. Pumice for lightweight aggregate characterized by being separated by 3 mm or more. The specific gravity difference of the air table type which removes the fraction of particle size more than 5 mm from the volcanic ejecta deposit mineral and blows air from the lower side toward the porous plate while vibrating the porous plate which is inclined at a predetermined angle from the horizontal direction. Supply to the sorting device, and sort into the heavy specific gravity, the light specific gravity, the dust collection, and the perforated plate drop,
A residual volcanic glass material obtained by separating fine aggregate from collected heavy specific gravity from collected heavy specific gravity or from fine plate and porous plate from falling, and having a particle size of 0. A volcanic glass material characterized by being separated to less than 05 mm. The specific gravity difference of the air table type which removes the fraction of particle size more than 5 mm from the volcanic ejecta deposit mineral and blows air from the lower side toward the porous plate while vibrating the porous plate which is inclined at a predetermined angle from the horizontal direction. Supply to the sorting device, and sort into the heavy specific gravity, the light specific gravity, the dust collection, and the perforated plate drop,
Remaining volcanic glass material obtained by separating fine aggregate by separating fine aggregate from sorted heavy specific gravity or from heavy specific gravity and perforated plate drop, and separated particles It is characterized by being obtained by crushing at least one of a volcanic glass material having a diameter of 0.05 mm to 0.3 mm, a volcanic glass material having a diameter of less than 0.05 mm, and a pumice consisting of volcanic glass having a particle diameter of 0.3 mm or more. A volcanic glass material for admixtures that has a pozzolanic effect.   A mixed cement having a pozzolanic effect, which is produced by mixing or mixing portland cement with the volcanic glass material according to claim 4 or 5 and then grinding it. The specific gravity difference of the air table type which removes the fraction of particle size more than 5 mm from the volcanic ejecta deposit mineral and blows air from the lower side toward the porous plate while vibrating the porous plate which is inclined at a predetermined angle from the horizontal direction. Supply to the sorting device, and sort into the heavy specific gravity, the light specific gravity, the dust collection, and the perforated plate drop,
Remaining volcanic glass material obtained by separating fine aggregate by separating fine aggregate from sorted heavy specific gravity or from heavy specific gravity and perforated plate drop, and separated particles Pearlite characterized by being obtained by firing or expanding a volcanic glass material having a diameter of 0.05 mm or more as it is or after crushing it.