JP2015139880A - Apparatus and method for producing bentonite mixed soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce bentonite mixed soil having stable quality by avoiding the direct addition of water to bentonite.SOLUTION: An apparatus 1 for producing bentonite mixed soil comprises: a bentonite supply part 7 to continuously supply bentonite 3 onto a belt conveyor 2; an aggregate supply part 11 to continuously supply an aggregate 8 onto a surface 3A of the bentonite 3 being conveyed by the belt conveyor 2; a comb-like body 12 to vibrate the aggregate 8 being supplied onto the bentonite surface 3A from the aggregate supply part 11 while being received by a plurality of bars 13 and fall the aggregate 8 onto the bentonite surface 3A from spaces 16 between the bars 13; a water spray part 21 to spray water onto the aggregate 8 covering the bentonite 3 while being conveyed by the belt conveyor 2; and a mixing part 22 to mix the aggregate 8 with the bentonite 3 after spraying water.

Description

  The present invention relates to a bentonite mixed soil manufacturing apparatus and a bentonite mixed soil manufacturing method.

  Bentonite mixed soil that exhibits excellent water shielding performance over a long period of time is used as a material for the water shielding structure in a waste disposal facility or the like. Such bentonite-mixed soil is produced by mixing bentonite and aggregate with water using a mixer, and it is necessary that both the water content ratio and the bentonite mixing ratio have desired quality. Bentonite, on the other hand, is a small particle having a water absorption property, and appropriate handling is required for various handling such as mixing and transportation. The following techniques have been proposed as conventional techniques relating to the supply and conveyance of such granular materials.

  That is, a first vibrating feeder provided with a roller for leveling and compressing the granular material in the conveying path of the granular material, and a screen on which a screen for putting the granular material discharged from the first vibrating feeder on a sieve is stretched. A powder material supply device (Patent Document 1) including a two-vibration feeder has been proposed.

JP-A-9-169426

  However, unlike the above-described prior art, an event that should be particularly taken into consideration occurs in the formation of bentonite mixed soil. That is, when water is added directly to bentonite, bentonite that rapidly absorbs water due to its high water absorption swells and generates a lot of lumps. Even if bentonite and aggregate were mixed, it was difficult to achieve a homogeneous mixture of the two, and it was difficult to produce a stable quality bentonite mixed soil.

  On the other hand, there is a technical idea to cover the bentonite surface before adding water with the aggregate to be mixed in order to suppress the occurrence of such lumps, but the aggregate is already in a lump due to the moisture it contains before mixing with bentonite. In many cases, the aggregate is intermittently supplied to the bentonite surface. For this reason, a portion that is not covered with aggregate on the bentonite surface is likely to occur, and it has been difficult to effectively prevent the occurrence of the lumps associated with the above-described water addition.

  Then, this invention aims at provision of the technique which avoids the direct hydration to bentonite and enables manufacture of the bentonite mixed soil of the stable quality.

  The bentonite mixed soil manufacturing apparatus that solves the above problems includes a bentonite supply unit that continuously supplies bentonite onto a belt conveyor, and a bone that continuously supplies aggregate toward the surface of the bentonite being conveyed by the belt conveyor. A comb-like body that vibrates while receiving the aggregate supplied to the bentonite surface from the aggregate supply unit with a plurality of bars, and drops onto the bentonite surface from the gaps between the bars; and A sprinkling unit that sprinkles water toward the aggregate covering the bentonite being conveyed by a belt conveyor, and a mixing unit that mixes the aggregate and the bentonite after the sprinkling are included.

  According to this, the aggregate such as sand that tends to be agglomerated with the moisture originally provided is once received by the vibrating comb-like body, and after passing between the bars in the comb-like body, the state is appropriately dispersed. It is possible to evenly sprinkle the bentonite surface. In that case, since the surface of bentonite being transported is in a state of being uniformly covered with aggregates in a scattered state, it is possible to avoid a situation in which water sprinkled by the sprinkling part reaches bentonite under the aggregates and this is hydrated . Therefore, the conventional bentonite which avoids the formation of lumps by bentonite and maintains the properties of homogeneous powder and the aggregate having an appropriate water content ratio by watering are mixed, and the water content ratio and It is possible to produce bentonite mixed soil having a desired quality in terms of the bentonite mixing ratio. In this way, the direct addition to bentonite can be avoided, and stable quality bentonite mixed soil can be produced.

  In the bentonite mixed soil manufacturing apparatus described above, the bar in the comb-like body is fixed at one end fixed to a predetermined support location, and the other end of the aggregate at the aggregate supply unit. The free end may extend toward the supply location, and may be disposed substantially in parallel with a predetermined interval between the bars.

  According to this, each bar whose tip (the above-mentioned other end) is a free end is vibrated efficiently by being vibrated by an appropriate vibration means, and the bones through the gaps between the bars in the comb-like body The material sieving operation can be ensured. Further, the rod end is a free end, and there is no crossing material in the rod crossing direction that obstructs the above-described aggregate reception from the aggregate supply location, and the aggregate can be smoothly received.

  Moreover, the above-mentioned bentonite mixed earth manufacturing apparatus WHEREIN: The said bar material in the said comb-shaped object is good also as a thing from which the vertical position of the said other end differs between adjacent bar materials.

  According to this, when each bar in the comb-like body vibrates, a situation in which the vibration transmitted to the aggregate on the bar and between each bar tends to be different for each bar, and the bar in the comb-like body Aggregate sieving operation through gaps between them can be made more efficient and reliable.

  In the bentonite mixed soil manufacturing apparatus described above, a net-like body may be further provided between the comb-like body and the belt conveyor.

  According to this, the aggregate screened off from the comb-like body can be further received and screened by the net-like body, and the aggregate that has been dispersed more reliably is sprinkled evenly on the bentonite surface. Is possible. Therefore, the above-described formation of lumps can be avoided more reliably, and bentonite mixed soil of desired quality can be efficiently generated.

  The bentonite mixed soil manufacturing method of the present invention includes a step of continuously supplying bentonite on a belt conveyor and a step of continuously supplying aggregate toward the surface of the bentonite being conveyed on the belt conveyor. The aggregate supplied to the bentonite surface is vibrated while being received by a plurality of bars, and dropped onto the bentonite surface from the gaps between the bars, and the bentonite being transported by the belt conveyor is covered A step of watering the aggregate, and a step of mixing the aggregate and the bentonite covered with the aggregate after the watering.

  According to the present invention, direct addition to bentonite can be avoided, and stable quality bentonite mixed soil can be produced.

It is a figure which shows the example of whole structure of the bentonite mixed-soil manufacturing apparatus of this embodiment. It is explanatory drawing which shows the operation example of the bentonite mixed soil manufacturing apparatus of this embodiment. It is explanatory drawing which shows the operation example of the comb-shaped body of this embodiment. It is a top view which shows the structural example of the comb-like body and net-like body in this embodiment. It is a front view which shows the structural example of the comb-like body and net-like body in this embodiment. It is a side view which shows the structural example of the comb-like body and net-like body in this embodiment.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram illustrating an example of the overall configuration of a bentonite mixed earth production apparatus 1 according to the present embodiment. Moreover, FIG. 2 is explanatory drawing which shows the operation example of the bentonite mixed-soil manufacturing apparatus 1 of this embodiment, and FIG. 3 is explanatory drawing which shows the operation example of the comb-shaped body of this embodiment.

  The bentonite mixed soil manufacturing apparatus 1 in this embodiment is an apparatus that avoids direct hydration to bentonite and enables the production of stable quality bentonite mixed soil. The bentonite mixed soil manufacturing apparatus 1 illustrated in FIG. 1 is an apparatus including a bentonite supply unit 7, an aggregate supply unit 11, a comb-like body 12, a net-like body 18, a water sprinkling unit 21, and a mixing unit 22. The bentonite supply unit 7 includes a bentonite hopper 4 that stores the bentonite 3 and a screw feeder that continuously discharges a predetermined amount of bentonite 3 at a constant speed from the lower end of the bentonite hopper 4 toward the first belt conveyor 2A. 5 is provided.

  The bentonite 3 discharged from the screw feeder 5 onto the first belt conveyor 2A is shaped so that the surface is flattened by the scraper 6 located downstream from the screw feeder 5, and the conveying operation of the first belt conveyor 2A. Accordingly, it moves toward the downstream end 2C.

  The aggregate supply unit 11 also includes an aggregate hopper 9 that stores aggregate 8 such as sand, and a predetermined amount of aggregate 8 that is discharged from a supply port 9A (FIGS. 2 and 3) below the aggregate hopper 9. And a belt feeder 10 that continuously supplies at a constant speed toward the surface 3A of the bentonite 3 being conveyed by the first belt conveyor 2A.

  In the aggregate supply unit 11, the aggregate 8 supplied from the belt feeder 10 toward the bentonite surface 3 </ b> A on the first belt conveyor 2 </ b> A falls in the process of dropping from the end 10 </ b> A of the belt feeder 10. It passes through the body 12. The comb-like body 12 vibrates by the vibrator 17 while receiving the aggregate 8 flowing on the belt feeder 10 that is rotationally driven by the plurality of rods 13 (FIGS. 2 and 3), and the first comb is formed from the gap 16 between the rods 13. It is dropped on the bentonite surface 3A on the belt conveyor 2A.

  The aggregate 8 at the time of being stored in the aggregate hopper 9 is often in a certain lump shape due to its own moisture, and as shown in FIG. 5, the supply port 9A of the aggregate hopper 9 is provided. There is also a situation where it is still in a lump even when it is discharged from the belt feeder 10. However, such aggregated aggregates 8 are also appropriately dispersed by passing between the bar members 13 of the comb-like body 12 that vibrates, and are uniformly sprinkled on the bentonite surface 3A. The bentonite surface 3A to which the aggregate 8 in such a separated state is supplied is shaped and flattened by the scraper 6 described above, and the aggregate 8 that has fallen through the comb-like body 12 is uniformly received, The bentonite 3 and the aggregate 8 form a two-layered interface.

  Here, in the bentonite mixed soil manufacturing apparatus 1 of the present embodiment, a net-like body 18 is further provided between the comb-like body 12 and the bentonite surface 3A on the first belt conveyor 2A. In this case, the aggregate 8 screened off from the comb-like body 12 is received by the mesh-like body 18 and further sifted. The mesh 18 may have a mesh diameter smaller than the gap 16 between the bar members 13 in the comb 12. Thus, the aggregate 8 that has been more reliably dispersed through the mesh body 18 than the case of the comb-like body 12 alone is sprinkled evenly on the bentonite surface 3A.

  Specific configuration examples of the comb-like body 12 and the net-like body 18 are shown in FIGS. In this case, the bar 13 in the comb-like body 12 described above has one end 14 fixed to the base 12A serving as a predetermined support location, and the other end 15 supplying the aggregate 8 at the aggregate supply unit 11. It is a free end extending toward the end 10 </ b> A of the belt feeder 10 that is a place. Further, each bar 13 is configured to be arranged substantially in parallel with a predetermined interval corresponding to the gap 16 described above. In addition, as shown in FIG.3 and FIG.5, if each bar | burr 13 differs between the adjacent bar | burrs 13, the position of the other end 15 which is a bar | burr front-end | tip differs in the up-down direction.

  The aggregate 8 discharged from the supply port 9A of the aggregate hopper 9 and located at the end 10A of the belt feeder 10 comes into contact with the other end 15 of the bar 13 as the belt feeder 10 is driven to rotate. Thus, the belt feeder 10 is scooped from the surface of the belt feeder 10 onto the bar 13 and the gap 16 between the bars. When the other end 15, which is a free end, comes into contact with the aggregate 8, since the end surface of the other end 15 has a small area, the force acting on the aggregate 8 from the bar 13 with the contact is applied to each other end 15. Concentrate on the tip. When the force concentrated on the end surface of a small area acts on the aggregate 8 due to such contact, the aggregated aggregate 8 is easily broken down and separated.

  On the other hand, the aggregate 8 scooped up while being appropriately broken by the other end 15 described above gradually moves toward the gaps 16 between the bars 13 that are vibrated by the vibration of the vibrator 17. And is screened out toward the net 18 below the bar 13. As described above, when the vertical positions of the other end 15 of each bar 13 are different from each other, the vibration transmitted to the aggregate 8 on the bar 13 or between the bars 13 is different for each bar 13. Therefore, the operation of sieving the aggregate 8 through the gap 16 between the bars 13 can be made more efficient and reliable.

  As shown in FIG. 6, the aggregate 8 scooped up from the surface of the belt feeder 10 onto the bar 13 and the gap 16 between the bars from the vicinity of the other end 15 of the bar 13 has a comb-like body 12. There may also occur a situation where the base portion 12A extends on the bar 13 and the gap 16. Even if such a situation arises, the bar 13 having a predetermined length vibrates due to vibration by the vibrator 17, so that the aggregate 8 on the bar 13 and the gap 16 will also vibrate evenly, It is screened out toward the net 18 below the bar 13 through the gap 16 between the bars 13.

  In addition, the first belt conveyor 2A or the aggregate supply unit 11 is configured so that the aggregate 8 that has passed through the mesh body 18 does not fall off the first belt conveyor 2A from the outer periphery of the mesh body 18. It is preferable that a guide plate 9B for narrowing the fall range of the aggregate 8 is provided on the belt conveyor 2A.

  The aggregate 8 unraveled by the comb-like body 12 and the net-like body 18 as described above falls and covers the surface 3A of the bentonite 3 uniformly. The bentonite 3 that uniformly covers the surface 3A with the aggregate 8 further moves toward the downstream end 2C in accordance with the conveying operation of the first belt conveyor 2A. In the vicinity of the downstream end 2 </ b> C on the first belt conveyor 2 </ b> A, the above-mentioned water sprinkling unit 21 is arranged. The sprinkler 21 is a mechanism that sprinkles water toward the surface 8A of the aggregate 8 that covers the surface 3A of the bentonite 3 that is being transported on the first belt conveyor 2A, and a water tank 19A that stores the water 19 and this It includes at least a nozzle 20 that ejects water 19 pumped from the water tank 19A toward the bentonite surface 3A.

  The water 19 ejected from the nozzle 20 of the sprinkler 21 wets the surface 8A of the aggregate 8 that covers the bentonite surface 3A, and appropriately raises the moisture content of the aggregate 8. However, since the bentonite surface 3A is uniformly covered with the aggregate 8, the water 19 from the nozzle 20 does not reach the bentonite 3 directly to be hydrated.

  After hydration to the aggregate 8 by the water sprinkling part 21 is performed, the bentonite 3 on the first belt conveyor 2A falls from the downstream end 2C described above together with the aggregate 8 after hydration covering the surface 3A. , And supplied to the continuous kneading mixer 22 (mixing unit). The continuous kneading mixer 22 continuously kneads the bentonite 3 and the hydrated aggregate 8 by, for example, a parallel biaxial rotation operation including a plurality of stirring blades to continuously generate the bentonite mixed soil 23. It is a device to perform.

  As described above, the situation where the bentonite 3 under the aggregate 8 is directly hydrated is avoided, and the formation of lumps in the bentonite 3 due to hydration is suppressed. Therefore, in the continuous kneading mixer 22, the bentonite 3 maintaining the properties of the homogeneous powder and the aggregate 8 having an appropriate water content ratio are mixed, and both the water content ratio and the bentonite mixing rate are of the desired quality. The bentonite mixed soil 23 can be continuously produced.

  The bentonite mixed soil 23 generated by the continuous kneading mixer 22 is discharged onto the second belt conveyor 2B and moves toward the downstream end 2D in accordance with the conveying operation of the second belt conveyor 2B. The bentonite mixed soil 23 that has reached the downstream end 2D is put into the storage tank 24 and appropriately stored until it is taken out according to the use opportunity.

  As described above, according to the present embodiment, direct addition to bentonite is avoided, and continuous production of stable quality bentonite mixed soil becomes possible.

  In addition, although this invention was concretely demonstrated based on the one embodiment, it is not limited to this, A various change is possible in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 1 Bentonite mixed-soil manufacturing apparatus 2 Belt conveyor 2A 1st belt conveyor 2B 2nd belt conveyor 2C, 2D Downstream end of belt conveyor 3 Bentonite 3A Bentonite surface 4 Bentonite hopper 5 Screw feeder 6 Scraper 7 Bentonite supply part 8 Aggregate 8A Bone Material surface 9 Aggregate hopper 9A Supply port 9B Guide plate 10 Belt feeder 10A Belt feeder end 11 Aggregate supply unit 12 Comb body 12A Base 13 Bar 14 One end 15 Bar other end 16 Clearance 17 Vibrator 18 Reticulated body 19 Water 19A Water tank 20 Nozzle 21 Sprinkling part 22 Continuous kneading mixer (mixing part)
23 Bentonite mixed soil 24 Storage tank

Claims (5)

A bentonite supply section for continuously supplying bentonite onto the belt conveyor;
An aggregate supply unit that continuously supplies aggregate toward the surface of bentonite being conveyed by the belt conveyor,
A comb-like body that vibrates while receiving the aggregate supplied from the aggregate supply unit to the bentonite surface with a plurality of bars, and drops onto the bentonite surface from the gaps between the bars, and
A watering part for spraying water toward the aggregate covering the bentonite being conveyed by the belt conveyor;
After the watering, a mixing part for mixing the aggregate and the bentonite,
A bentonite mixed soil production apparatus comprising:   The bar in the comb-like body is a fixed end whose one end is fixed to a predetermined support location, the other end is a free end extending toward the aggregate supply location in the aggregate supply unit, 2. The bentonite mixed soil manufacturing apparatus according to claim 1, wherein the bentonite mixed soil producing apparatus is arranged substantially parallel to each other with a predetermined interval between the bars.   The bentonite mixed earth manufacturing apparatus according to claim 2, wherein the bar in the comb-like body is different in the vertical position of the other end between adjacent bars.   The bentonite mixed earth manufacturing apparatus according to any one of claims 1 to 3, further comprising a net-like body between the comb-like body and the belt conveyor. Continuously supplying bentonite on the belt conveyor;
Continuously supplying aggregate toward the surface of the bentonite being conveyed on the belt conveyor;
Aggregating the aggregate supplied to the bentonite surface while vibrating with a plurality of bars, dropping the bentonite surface from the gap between the bars,
Watering the aggregate covering the bentonite being conveyed by the belt conveyor; and
After the watering, mixing the aggregate and the bentonite covered with the aggregate;
The bentonite mixed-soil manufacturing method characterized by including.