JP6747420B2 - Method and equipment for sorting and recovering valuable materials from waste materials - Google Patents

Description

The present invention relates to a technique for selecting and recovering valuable materials to be recycled as raw materials for recycling from waste materials including used refractories generated in iron mills and the like.

In the past, when valuable materials were sorted and collected from steel slag and used refractory waste, the valuable materials were sorted and collected by crushing and then adjusting the particle size with a sieve, and then physical sorting such as magnetic sorting and color sorting. A method (for example, Patent Document 1), a method of recovering the valuable material on the sieve as it is after the particle size adjustment, a method of crushing and magnetically sorting as it is to recover the valuable material (for example, Patent Document 2), etc. are adopted. ing.

JP, 2003-88845, A JP 2008-25934 A

Refractory materials are used in equipment and containers that come into contact with molten materials (molten iron and slag) at steel mills, but they are dismantled at the end of their lives due to melting damage. It is desirable to reuse the used refractories generated by this dismantling as refractory raw materials in order to save resources and reduce equipment costs. Usually, used refractory materials are discharged in a state where a plurality of types of materials are mixed, and since impurities are abundant and the quality is not stable as it is, it is necessary to select reusable materials (valuable materials).

Hereinafter, the used refractory material generated in the steel factory will be described by taking the blast furnace gutter refractory material as an example. In the main gutter of the blast furnace, through which pig iron tapped from the tuyere of the blast furnace is passed, refractory materials with different components called metal line materials and slag line materials are used in combination. FIG. 12 schematically shows a cross section in the width direction of the blast furnace main gutter at the time of use. The blast furnace gutter refractory (metal line material, slag line material) used in this blast furnace main gutter is used for a certain period of time and then disassembled (crushed) using heavy equipment. The scraps are generally discharged in a state in which metal line materials, slag line materials, adhered slag, metal, etc. are mixed. The respective components and densities are shown in Table 1. Since the metal line material contains a large amount of Al ₂ O ₃ and the slag line material contains a large amount of SiC, after the metal removal by magnetic force selection, physical selection such as density selection is performed. If you select each material, it can be recycled as a raw material, which is an industrial advantage.

On the other hand, in physical sorting such as density sorting or color sorting, there is a particle size of a sorting target suitable for sorting. From such a viewpoint, as a result of studying the recycling treatment of the used refractory waste as described above, when the whole raw material (sorting target) is crushed as a pretreatment like the method of Patent Documents 1 and 2, the It was found that as a result of being crushed to particles having a particle size suitable for physical sorting, fine powder unsuitable for physical sorting increased, and the recycling yield decreased.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, and to sort and collect valuables to be recycled as raw materials for recycling from waste materials including used refractories, and to sort valuables with a high recycling yield. -To provide methods and equipment that can be collected. Another object of the present invention is to provide a method for producing a valuable resource by such sorting and recovery.

Hereinafter, the background of the present invention will be described with reference to a case where the sorting target (waste material) is blast furnace gutter refractory waste. Since the adhered slag (blast furnace slag), the slag line material, and the metal line material contained in the blast furnace gutter refractory waste material have different densities as shown in Table 1, the density selection was adopted as the physical selection. Although there are various methods for density selection, dry solid gas flow bed density selection and air table type density selection were selected considering the throughput and maintainability. As a result of the density screening, the adhered slag as a low density product, the slag line material as a medium density product, and the metal line material as a high density product are collected, and the medium density product serves as an inexpensive SiC source to replace a new raw material and The density product could be recycled as an inexpensive Al ₂ O ₃ source that can replace the new raw material. According to our studies, the density of 2.45 g / cm ³ less than the material low density products, density 2.45-2.70g / cm ³ of the material medium density products, density 2.70 g / cm ³ greater It was possible to produce a high-performance recycled refractory material by using the above material as a high density material.

Here, both the dry solid gas fluidized bed type density selection method and the air table type density selection method adopted for physical selection have particle diameters of objects to be selected suitable for the respective selection. Specifically, a particle size of about 10-40 mm is suitable for dry solid gas/fluidized bed type density screening, and if the particle size is smaller than this, the floating/sinking behavior of particles is large due to bubbles rising or convection in the fluidized bed. Since it is affected, the sorting accuracy is reduced. On the other hand, if the particle size is larger than this, the particles themselves hinder the blowing of air above the particles and the fluidization in the upper part of the fluidized bed is hindered. In addition, a particle size of about 2-10 mm is suitable for the air table type density screening, and a particle size smaller than this is affected by the adhesive force acting on the powder particles, and the particle behavior is affected. To do. On the other hand, if the particle size is larger than this, it becomes difficult to levitate the low-density particles by blowing air from the lower part, so that the sorting accuracy also decreases in this case.

On the other hand, since the particle size of the blast furnace gutter refractory waste that is the object to be sorted is 0-300 mm, it is necessary to crush and classify the blast furnace gutter refractory waste to a particle size suitable for each method by density classification. However, if crushing is performed, fine powder with a particle size of 2 mm or less, which is difficult to perform density selection, is always generated. Since the recycling yield decreases when the amount of fine powder generated is large, it is important to take measures to reduce the generation of fine powder in the crushing process as much as possible.
As one of the measures, for example, application of a crushing means that does not easily generate fine powder is considered. As a crushing means that does not easily generate fine powder, a jaw crusher, a roll crusher, etc. are generally known. It is not enough to apply different crushing means.

Therefore, as a result of diligent examination of a method capable of suppressing the generation of fine powder from the process side, the present inventors first performed a particle size adjustment as a pretreatment for physically sorting refractory scraps and recovering valuable materials. By classifying with a sieve and crushing only on that sieve, refractory scraps with a particle size suitable for physical sorting from the beginning will not be crushed, so it is possible to suppress the increase of fine powder that is not suitable for physical sorting I got the idea that the recycling yield of can be increased. For example, when physically sorting blast furnace gutter refractory waste to recover valuables, first classify with a sieve with a predetermined opening and crush only on the sieve to a particle size that passes through the sieve with the above opening. The crushed material and the sieve under the above-mentioned sieve are subjected to physical sorting through classification for removing fine powder, and by this, blast furnace gutter refractory waste can be recycled as a raw material with high yield while suppressing generation of fine powder as much as possible. it can.

The present invention was made based on the above idea, and has the following gist.
[1] A method for sorting and recovering valuable materials from waste materials including used refractories,
A method for selecting and recovering valuable materials from waste materials, which comprises the following steps (1) to (4).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ , and The fine powder content under the sieve is removed.
(4) Impurities are removed by physical selection from the waste material on the screen in step (3), and the waste material from which the impurities have been removed is recovered as a valuable resource.

[2] A method for sorting and recovering valuable materials from waste materials including used refractory materials,
A method for sorting and recovering valuable materials from waste materials, which comprises the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2a) into particles having a particle size of D ₁ that passes through the sieve.
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) The waste material placed on the sieve in step (3) is crushed by the crushing device (2b) into particles having a particle size of D ₂ that passes through the sieve.
(5) The waste material crushed in step (4) is classified together with the waste material under the sieve in step (3) with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and The fine powder content under the sieve is removed.
(6) Impurities are removed by physical selection from the waste material on the screen in step (5), and the waste material from which the impurities have been removed is recovered as a valuable resource.

[3] A method for sorting and recovering valuable materials from waste materials including used refractory materials,
A method for sorting and recovering valuable materials from waste materials, which comprises the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) Impurities are removed by physical selection from the waste material on the screen in step (3), and the waste material from which the impurities have been removed is recovered as a valuable resource.
(5) The waste material under the sieve in the step (3) is classified with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and the fine powder content under the sieve is removed.
(6) Impurities are removed by physical selection from the waste material on the screen in step (5), and the waste material from which the impurities have been removed is recovered as a valuable resource.

[4] In the selection and recovery method according to any of [1] to [3] above, the waste material is used refractory waste in the metal smelting process, and the valuable material is selectively recovered from the waste material. Method.
[5] The method for sorting and recovering valuable materials from waste materials, wherein the used refractory waste is blast furnace gutter refractory waste in the method [4] above.
[6] The method for sorting and recovering valuable materials from waste materials, wherein the physical sorting is density sorting or color sorting in the sorting and collecting method according to any one of the above [1] to [5].
[7] The method for sorting and recovering valuable materials from waste materials, characterized in that the density sorting is dry solid gas fluidized bed type density sorting or air table type density sorting in the above-mentioned [6] sorting and collecting method.

[8] A facility for sorting and recovering valuable materials from waste materials including used refractories,
A sieve (1a) with an opening D ₁ for classifying waste materials,
The waste material became on the sieve with sieve (1a), crushing device for crushing a particle size passing through a sieve having a mesh opening D ₁ and (2),
A sieve having an opening D ₂ smaller than the opening D ₁ for classifying the waste material crushed by the crushing device (2) together with the waste material under the sieve (1a) (1b )When,
A facility for sorting and recovering valuable materials from waste material, comprising a physical sorting device (3) for removing impurities by physically sorting the waste material on the sieve (1b).

[9] Equipment for sorting and recovering valuable materials from waste materials including used refractories,
A sieve (1a) with an opening D ₁ for classifying waste materials,
The waste material became on the sieve with sieve (1a), crushing device for crushing a particle size passing through a sieve having a mesh opening D ₁ and (2a),
A sieve having an opening D ₂ smaller than the opening D ₁ for classifying the waste material crushed by the crushing device (2a) together with the waste material under the sieve (1a) (1b )When,
A crushing device (2b) for crushing the waste material on the screen of the sieve (1b) to a particle size that passes through the sieve having an opening D ₂ .
A sieve having an opening D ₃ smaller than the opening D ₂ for classifying the waste material crushed by the crushing device (2b) together with the waste material under the sieve (1b) (1c )When,
A facility for sorting and recovering valuable materials from waste material, comprising a physical sorting device (3) for removing impurities by physically sorting the waste material on the sieve (1c).

[10] Equipment for sorting and recovering valuable materials from waste materials including used refractories,
A sieve (1a) with an opening D ₁ for classifying waste materials,
The waste material became on the sieve with sieve (1a), crushing device for crushing a particle size passing through a sieve having a mesh opening D ₁ and (2),
A sieve having an opening D ₂ smaller than the opening D ₁ for classifying the waste material crushed by the crushing device (2) together with the waste material under the sieve (1a) (1b )When,
A physical sorting device (3a) for removing impurities by physically sorting the waste material on the sieve with the sieve (1b);
A sieve having an opening D ₃ smaller than the opening D _2, and a sieve (1c) for classifying the waste material under the sieve (1b),
A facility for sorting and recovering valuable materials from waste materials, which comprises a physical sorting device (3b) for removing impurities by physically sorting the waste materials on the sieve (1c).

[11] The waste according to any one of [8] to [10] above, wherein the physical sorting devices (3), (3a), (3b) are density sorting devices or color sorting devices. Equipment for sorting and collecting valuable materials from materials.
[12] The sorting and collecting equipment of the above [11], wherein the density sorting device is a dry solid-gas fluidized bed type density sorting device or an air table type density sorting device, ..

[13] A method of manufacturing a valuable resource, which comprises using a waste material containing a used refractory material as a raw material and selecting and recovering the valuable material from the raw material,
A method for producing a valuable resource using a waste material as a raw material, which has the following steps (1) to (4).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ , and The fine powder content under the sieve is removed.
(4) Impurities are removed by physical selection from the waste material on the screen in step (3), and the waste material from which the impurities have been removed is recovered as a valuable resource.

[14] A method of manufacturing a valuable resource, which comprises using a waste material containing a used refractory material as a raw material and selecting and recovering the valuable material from the raw material,
A method for producing a valuable resource using a waste material as a raw material, which has the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2a) into particles having a particle size of D ₁ that passes through the sieve.
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) The waste material placed on the sieve in step (3) is crushed by the crushing device (2b) into particles having a particle size of D ₂ that passes through the sieve.
(5) The waste material crushed in step (4) is classified together with the waste material under the sieve in step (3) with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and The fine powder content under the sieve is removed.
(6) Impurities are removed by physical selection from the waste material on the screen in step (5), and the waste material from which the impurities have been removed is recovered as a valuable resource.

[15] A method of manufacturing a valuable resource, which comprises using a waste material containing a used refractory material as a raw material and selecting and recovering the valuable material from the raw material,
A method for producing a valuable resource using a waste material as a raw material, which has the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) Impurities are removed by physical selection from the waste material on the screen in step (3), and the waste material from which the impurities have been removed is recovered as a valuable resource.
(5) The waste material under the sieve in the step (3) is classified with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and the fine powder content under the sieve is removed.
(6) Impurities are removed by physical selection from the waste material on the screen in step (5), and the waste material from which the impurities have been removed is recovered as a valuable resource.

[16] In the manufacturing method according to any one of the above [13] to [15], the waste material is used refractory waste in a metal smelting process, and the production of a valuable material using the waste material as a raw material. Method.
[17] In the manufacturing method of the above-mentioned [16], the used refractory waste is blast furnace gutter refractory waste, and a method for producing a valuable resource using waste materials as a raw material.
[18] The method for producing a valuable resource using waste materials as a raw material according to any one of the above [13] to [17], wherein the physical sorting is density sorting or color sorting.
[19] In the manufacturing method according to any one of the above [18], the method of manufacturing a valuable resource using waste materials as a raw material, characterized in that the density screening is dry solid gas fluidized bed density screening or air table type density screening ..

According to the method and facility for sorting and recovering valuable materials of the present invention, when sorting and recovering valuable materials to be recycled as raw materials for recycling from waste materials containing used refractories, it is suitable for physical sorting in the pretreatment step before physical sorting. Since many particles with different particle diameters are obtained, valuable materials can be selected and collected with a high recycling yield. Further, according to the method for producing a valuable resource of the present invention, a valuable resource can be produced with a high yield by using waste materials as raw materials.

Explanatory drawing which shows the processing flow in the 1st selection collection method and equipment of this invention. Explanatory drawing which shows the processing flow in the 2nd selection collection method and equipment of this invention. Explanatory drawing which shows the processing flow in the 3rd selection collection method and equipment of this invention. Explanatory drawing which shows one Embodiment of the dry-type solid gas fluidized bed type density sorting device used for physical sorting in this invention. Explanatory drawing which shows one Embodiment of the air table type density sorting device used for physical sorting in this invention. Explanatory drawing which shows the processing flow of the comparative example in Example 1. Explanatory drawing which shows the processing flow of the example of this invention in Example 1. Explanatory drawing which shows the processing flow of the comparative example in Example 2. Explanatory drawing which shows the processing flow of the example of this invention in Example 2. Explanatory drawing which shows the processing flow of the comparative example in Example 3. Explanatory drawing which shows the processing flow of the example of this invention in Example 3. Explanatory drawing that schematically shows the cross section in the width direction of the blast furnace main gutter when in use

The present invention is a method of sorting and recovering valuable materials from waste materials containing used refractories, and the type of "waste materials containing used refractories" to be sorted is not particularly limited, but in general, It is a waste material that consists mainly of used refractories, and foreign matter other than refractory mixed in (including adhered and infiltrated). A typical example is used refractory waste in a metal smelting process for the purpose of manufacturing steel. Generally, the used refractory waste in the metal smelting process is a mixture of the original refractory and adhered slag or metal (including adhered/infiltrated). Further, among the used refractory scraps in the metal smelting process, the blast furnace gutter refractory scraps are discharged in a state in which the metal line material, the slag line material, the adhered slag, the ingot, etc. are mixed as described above, Among them, the metal line material and the slag line material are required to be separately collected with a high recycling yield, so that the method of the present invention is particularly useful. In addition to blast furnace gutter refractory waste, used refractory waste such as molten iron carrier containers, refining vessels, and tundish of a continuous casting machine can be used.

FIG. 1 is an explanatory diagram showing a processing flow in the first sorting and collecting method and equipment of the present invention. The first sorting and collecting method of the present invention is a method suitable for sorting and collecting a valuable resource in a relatively large particle size, and has the following steps (1) to (4).
(1) classified with a mesh opening D ₁ of the sieve 1a waste material.
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device 2 to a particle size that passes through the sieve having the opening D ₁ .
(3) Classify the waste material crushed in step (2) together with the waste material that has been sieved in step (1) with a sieve 1b having an opening D ₂ smaller than the opening D ₁ and then sieving The fine powder that has become
(4) Impurities are removed by physical selection (physical selection device 3) from the waste material on the screen in step (3), and the waste material from which the impurities have been removed is recovered as a valuable resource.
That is, in this sorting and collecting method, first, the waste material is classified with the sieve 1a (step (1)), only the upper portion of the sieve is crushed (step (2)), and the crushed material and the lower portion of the sieve are sieved with the sieve 1b. After classifying to remove fine powder (step (3)), impurities are removed by physical selection to recover valuables (step (4)).

If the waste material is used refractory scraps (for example, blast furnace gutter refractory scraps) in the metal smelting process for the purpose of steel production, etc., the waste material contains a relatively large amount of metal. In many cases, if necessary, a process of removing the metal is performed before the step (1). In the case of used refractory waste such as blast furnace gutter refractory waste, etc., iron removal (removal of metal) is performed by means of, for example, a lifting magnet, a drum type magnetic separator.
Vibrating sieves are generally used as the sieves 1a and 1b used in the steps (1) and (3), but are not limited thereto.
The crushing device 2 used in the step (2) may be of any type, but a jaw crusher and a roll crusher are particularly preferable because they are crushing means that generate a relatively small amount of fine powder.

Although the type of physical selection (physical selection device 3) used in the step (4) is arbitrary, density selection or color selection is preferable in terms of selection accuracy. Further, for the same reason, among the density selections, the dry solid-gas fluidized bed density selection and the air table density selection are particularly preferable.
Here, the dry solid-gas fluidized bed type density sorting is performed by introducing the object to be sorted into a solid-gas fluidized bed that is fluidized by a blown air from below to form a fluidized medium of granular material, which is higher than the apparent density of the solid-gas fluidized bed. Objects with different densities are selected by levitating small density objects (low density products) and sinking objects with higher density than the apparent density of the solid-gas fluidized bed (high density products) and recovering each. It is a thing. Details of the device for density selection will be described later.

In addition, the air-table type density sorting is performed by applying vibration to the table (plate) tilted in the longitudinal direction and the width direction in the width direction while air is blown from below the table to the table surface. (I) High-density objects (high-density products) are greatly affected by the frictional force of the table surface, so the high side of the table surface inclined in the width direction due to the carrying force of the table vibration. (Ii) Objects with low density (low density products) are more affected by the air flow blown out from the table surface than the carrying force due to the vibration of the table, so the table surface inclined in the width direction is low. (Iii) Intermediate density objects (medium density products) are collected in the middle between the high side and the low side of the table surface inclined in the width direction, and are discharged from the discharge section at the table end, respectively. By collecting each of them, objects having different densities are selected. Details of the device for density selection will be described later.
Color selection utilizes the fact that different colors are used depending on the material of the waste material (for example, different types of refractories and slag), and the waste material conveyed by a belt conveyor is photographed by a camera, and the color information is recorded. Based on this, when a predetermined object to be removed passes the position of the air gun, the object is blown away by the air gun to select objects having different colors.

As described above, the first sorting and collecting method of the present invention is a method suitable for sorting and collecting valuable materials with a relatively large particle size, and the particle size of the sorting target suitable for sorting is the dry solid-gas flow rate. Since the layer type density sorting is about 10-40 mm and the air table type density sorting is about 2-10 mm, the dry solid-gas fluidized bed type density sorting is particularly preferable for the physical sorting of the first sorting and collecting method of the present invention. .. Further, since color selection is also suitable for selection of objects having a relatively large particle size, it is suitable for physical selection according to the first selection/collection method of the present invention.

In the first sorting and collecting method of the present invention, for example, the waste material is classified by the sieve 1a having an opening of 40 mm, and only the waste material on the sieve in this classification is passed through the sieve having an opening of 40 mm by the crushing device 2. Crush to a particle size Then, the crushed waste material is classified together with the waste material which has been sieved by the classification of the sieve 1a by the sieve 1b having an opening of 10 mm, and the fine powder component which is the sieved material is removed. Impurities are removed by physical sorting (physical sorting device 3) from the waste material that has been sieved by the classification of the sieve 1b, and the waste material from which the impurities have been removed is recovered as a valuable resource. As described above, the physical sorting is preferably the density sorting or the color sorting, and among the density sorting, the dry solid-gas fluidized bed type density sorting is particularly preferred.

Further, for example, when the waste material is used blast furnace gutter refractory waste, it is preferable that the refractory waste is an impurity due to the density sorting (particularly preferably the dry solid gas flow bed density sorting) or the color sorting. , Valuable metal materials (refractory materials) and slag line materials (refractory materials) are sorted and valuable materials are collected. Here, when applying the dry solid-gas fluidized bed type density sorting, as will be described later, this dry solid-gas fluidized bed type density sorting is a selection of light weight (low density product) and heavy weight (high density product). Since it is only possible to do so, the density selection of refractory waste is performed twice. For example, the first time, the adhered slag + slag line material which is a lightweight material and the metal line material which is a heavy material are selected. The second time performed on the light weight material sorted in (1) is sorted into a heavy weight slag line material and a light weight attached slag. Depending on the case, the first time the adhered slag, which is a lightweight material, and the heavy-weight refractory waste (metal line material + slag line material) are selected, and the second time performed for this refractory waste is the heavy weight material. Alternatively, the metal line material that is a slag line material and the slag line material that is a lightweight product may be selected. Regarding the metal line material and slag line material that have been sorted and collected in this way, in order to further improve the purity, (i) crushing → refractory (magnetic line material or slag line material by magnetic sorting) ) And base steel, or (ii) crushing → classification → refractory (metal line material or slag line material) and base metal by magnetic selection of sieving material and sieving material. Be seen.

The sorting/recovery facility provided for carrying out the first sorting/recovering method of the present invention is a facility for sorting/recovering valuable materials from waste materials including used refractories, and as shown in FIG. , (I) a sieve 1a with an opening D ₁ for classifying the waste material, and (ii) the waste material on the sieve with this sieve 1a is crushed to a particle size that passes through the sieve with an opening D ₁ And (iii) a sieve having an opening D ₂ smaller than the opening D ₁ for crushing the waste material crushed by the crushing apparatus 2 together with the waste material under the sieve 1 a It has a sieve 1b for removing the impurities, and (iv) a physical sorting device 3 for removing impurities by physically sorting the waste material on the sieve by this sieve 1b. The details of each device constituting this equipment are as described above.

FIG. 4 shows an embodiment of a dry solid-gas fluidized bed type density sorting device that constitutes the physical sorting device 3. In this dry solid-gas fluidized bed type density sorting device, a granular fluidized medium having a predetermined layer thickness is put in a separation tank 4, and gas (usually air) is blown from a gas blowing section 5 at the bottom of the tank. The fluidized medium is fluidized and the solid gas fluidized bed 6 is formed. This apparatus uses, as a fluid medium, a granular material whose apparent density in a fluidized state is lower than the weight x (high density product) of the waste material and higher than the weight y (low density product) of the waste material. The heavy material x inside is settled to the lower side of the solid-gas fluidized bed 6, and the light material y is floated to the upper side of the solid-gas fluidized bed 6 to be separated. As the fluid medium, for example, when the waste material is blast furnace gutter refractory waste, zircon sand, iron powder or the like can be used. The particle size of the particulate matter forming the fluidized medium is not particularly limited, but it is generally preferably about 0.08 to 0.25 mm.
The apparent density of the fluidized medium forming the solid gas fluidized bed 6 can be adjusted to some extent by adjusting the flow rate of the fluidizing gas.

The separation tank 4 includes a waste material supply unit 7 that supplies (inputs) waste material into the tank, and a sediment collector 8 that collects and collects the heavy material x that has settled on the lower side of the solid-gas fluidized bed 6. The floating material collector 9 that collects and collects the lightweight material y that has floated above the solid-gas fluidized bed 6, and the discharge unit 10 that discharges the heavy material x collected by the sediment collector 8 to the outside of the tank. And a discharge part 11 for discharging the lightweight material y collected by the floating material collector 9 to the outside of the tank.
The sediment collector 8 is guided by a plurality of pulleys 80 (at least a part of which is a drive pulley) and moves along an inner wall of the tank including the tank bottom, and an endless belt 81 that is suitable in the longitudinal direction of the endless belt 81. A plurality of scrapers 82 for catching sediments provided at intervals are provided.

The floating material recovery device 9 is a horizontal conveyor type device, and is guided by two pulleys 90 (at least one of which is a drive pulley) to move in the horizontal direction, and an endless belt 91 that is suitable in the longitudinal direction of the endless belt 91. Equipped with a plurality of scrapers 92 for capturing floating objects provided at various intervals, the scraper 92 of the endless belt portion that moves on the lower surface side of the conveyor catches the lightweight object y floated on the upper side of the solid gas fluidized bed 6 and captures it. It is placed at a height that allows it.
The discharge part 10 of the heavy load x is a scraper when the endless belt 81 of the sediment collector 8 passes through the bottom of the tank and the heavy load x is captured by the scraper 82 and then moves to the top wall of the tank through the side wall of the tank. It is provided so that the heavy object x separated from 82 is taken in, and has a structure incorporated in the pulley 80 in the present embodiment.

The discharge part 11 of the lightweight material y is detached from the scraper 92 when the endless belt portion of the floating material collector 9 moves on the lower surface side of the conveyor and the scraper 92 catches the lightweight material y and then reaches the end portion of the conveyor. The lightweight object y is provided so as to be taken in. In the present embodiment, the scraper 110 that catches the lightweight object y that has come off the scraper 92, and the discharge port 111 that takes in the lightweight object y that is caught by the scraper 110 are provided. It is composed of a rotating body.

In this dry solid-gas fluidized bed type density sorting device, when the waste material is supplied from the waste material supply unit 7 into the separation tank 4 with the solid-gas fluidized bed 6 formed, the heavy substance x in the waste material is solidified. The heavy material x settles on the lower side of the fluidized bed 6, is collected and collected by the sediment collector 8, and is discharged from the discharge unit 10. On the other hand, the lightweight material y floats above the solid gas fluidized bed 6, and the lightweight material y is collected and collected by the floating material collector 9 and discharged from the discharge portion 11. As described above, the heavy object x and the light object y are selected.
As described above, this dry solid-gas fluidized bed type density sorting device is suitable for sorting waste material having a relatively large particle size (particularly, a waste material having a particle size of about 10-40 mm).

FIG. 5 shows an embodiment of an air-table type density sorting device that constitutes the physical sorting device 3. The table 12 of this air table type density sorting device has a waste material supply section 120 at one end side in the longitudinal direction and a waste material discharge section 121 at the other end side. It is divided into two discharge parts 121a, 121b, 121c. The table 12 has an inclination (an inclination with a height difference h ₁ ) such that the slag discharge side is lowered in the longitudinal direction, and also an inclination (an inclination with a height difference h ₂ ) in the width direction. Micro air holes 123 are formed in the entire table 12, and air supplied from below the table 12 is blown out to the table surface through the air holes 123. Further, the table 12 is configured to vibrate in the width direction by a vibrating mechanism (not shown).

In this air table type density sorting device, the waste material is supplied from the waste material supply unit 120 onto the table surface while the table 12 vibrates in the width direction and air is blown from the air holes 123 to the table surface. The supplied waste material moves toward the waste material discharge portion 121 due to the inclination of the table 12 in the longitudinal direction, but the heavy load x (high density product) in the waste material is greatly affected by the frictional force due to the table surface. Therefore, by the carrying force of the vibration of the table, the particles are collected on the high side of the table surface inclined in the width direction and discharged from the discharging portion 121a. On the other hand, since the lightweight material y (low density material) in the waste material is more affected by the air flow ejected from the air holes 123 than the carrying force due to the vibration of the table, the table surface inclined in the width direction is low. It is slid down to the side, collected, and discharged from the discharge part 121b. Further, since the medium-weight substance z (medium-density product) in the waste material exhibits an intermediate behavior between the heavy substance x and the light weight portion y, it is discharged from the discharge portion 121c at the center in the width direction of the waste material discharge portion 121. .. As described above, the heavy product x (high density product), the medium product z (medium density product) and the light product y (low density product) are selected.

As described above, this air table type density sorting device is suitable for sorting waste materials having a relatively small particle size (especially waste materials having a particle size of about 2-10 mm).
In the embodiment of FIG. 5, the waste material discharge part 121 of the table 12 is partitioned by the partition plate 122 into three discharge parts 121a, 121b, 121c in the width direction, but the partition plate 122 is not provided and the table 122 is not provided. Both ends of the table 12 in the table width direction on the other end side of 12 may be discharge parts 121a and 121b. In this case, the waste materials are sorted into heavy items x (high density items) and light items y (low density items). Further, three or more partition plates 122 may be provided so that the waste material discharging part 121 is partitioned into four or more discharging parts.

Further, the first valuable material manufacturing method of the present invention is a method of manufacturing a valuable material in which a waste material containing a used refractory is used as a raw material, and the valuable material is selected and recovered from the raw material, and is shown in FIG. As described above, the following steps (1) to (4) are included. The details of each step are the same as those in the first sorting and collecting method of the present invention described above.
(1) classified with a mesh opening D ₁ of the sieve 1a waste material.
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device 2 to a particle size that passes through the sieve having the opening D ₁ .
(3) Classify the waste material crushed in step (2) together with the waste material that has been sieved in step (1) with a sieve 1b having an opening D ₂ smaller than the opening D ₁ and then sieving The fine powder that has become
(4) Impurities are removed by physical selection (physical selection device 3) from the waste material on the screen in step (3), and the waste material from which the impurities have been removed is recovered as a valuable resource.
According to the first method for producing valuables of the present invention, it is possible to produce valuables with a high yield by using a waste material containing a used refractory as a raw material.

FIG. 2 is an explanatory diagram showing a processing flow in the second sorting and collecting method and equipment of the present invention. The second sorting and collecting method of the present invention is a method suitable for sorting and collecting a valuable resource with a relatively small particle size, and has the following steps (1) to (6).
(1) classified with a mesh opening D ₁ of the sieve 1a waste material.
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device 2a into particles having a particle size of D ₁ which passes through the sieve.
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve 1b having an opening D ₂ smaller than the opening D ₁ .
(4) The waste material on the sieve in step (3) is crushed by the crushing device 2b into particles having a particle size of D ₂ which passes through the sieve.
(5) Classify the waste material crushed in the step (4) together with the waste material under the sieve in the step (3) with a sieve 1c having an opening D ₃ smaller than the opening D ₂ and then sieving The fine powder that has become
(6) Impurities are removed from the waste material on the screen in step (5) by physical selection (physical selection device 3), and the waste material from which the impurities have been removed is recovered as a valuable resource.
That is, in this sorting and collecting method, first, the waste material is classified by the sieve 1a (step (1)), only the sieve is crushed (step (2)), and the crushed material and the sieve bottom are further sieve 1b. After classifying with (step (3)), crushing only on the sieve (step (4)), classifying the crushed material and the bottom of the sieve with the sieve 1c to remove fine powder (step (5)) The physical selection removes impurities and recovers valuable materials (step (6)).

Also in this second sorting and collecting method of the present invention, the removal of the metal is performed before the step (1) if necessary, and the sieve 1 used in the steps (1), (3) and (5) Details of (1a, 1b, 1c), details of the crushing device 2 (2a, 2b) used in steps (2) and (4), details of the physical sorting device 3 used in step (6), etc. Since it is the same as the selection and collection method of No. 1, detailed description is omitted. However, as described above, the second sorting and collecting method of the present invention is a method suitable for sorting and collecting valuables having a relatively small particle size, and the particle size of the sorting target suitable for sorting is the dry solid Since the air-fluidized bed type density sorting is about 10-40 mm and the air table type density sorting is about 2-10 mm, the air table type density sorting is particularly preferable for the physical sorting of the second sorting and collecting method of the present invention.

In the second sorting and collecting method of the present invention, for example, the waste material is classified by the sieve 1a having an opening of 40 mm, and only the waste material on the sieve in this classification is passed through the sieve having an opening of 40 mm by the crushing device 2a. Crush to a particle size Then, this crushed waste material is classified together with the waste material under the sieve of the sieve 1a by the sieve 1b having a mesh size of 10 mm, and the waste material on the sieve by this classification is crushed by the crushing device 2b. It is crushed into particles having a size of 10 mm. Then, the crushed waste material is classified together with the waste material which has been sieved by the classification of the sieve 1b by the sieve 1c having a mesh size of 2 mm, and the fine powder component which is the sieved material is removed. Impurities are removed by physical sorting (physical sorting device 3) from the waste material that has been sieved by the classification of the sieve 1c, and the waste material from which the impurities have been removed is recovered as a valuable resource. As described above, the physical sorting is preferably density sorting or color sorting, and among the density sorting, the air table type density sorting is particularly preferred.

In addition, for example, when the waste material is used blast furnace gutter refractory waste, it is preferable to perform density sorting (particularly preferably air table type density sorting) or color sorting for the adhering slag or valuable material in which the refractory waste is an impurity. Is sorted into metal line materials (refractory materials) and slag line materials (refractory materials), and valuable materials are collected. Here, when the air table type density sorting is applied, as described above, this density sorting apparatus simultaneously uses light weight (low density), medium weight (medium density), and heavy weight (high density). Since it is possible to sort products), attached slag which is a lightweight product, slag line material which is a medium amount product, and metal line material which is a heavy product are selected. Regarding the metal line material and slag line material that have been sorted and collected in this way, in order to further improve the purity, (i) crushing → refractory (magnetic line material or slag line material by magnetic sorting) ) And base steel, or (ii) crushing → classification → refractory (metal line material or slag line material) and base metal by magnetic selection of sieving material and sieving material. Be seen.

The sorting/recovery equipment used for carrying out the second sorting/recovering method of the present invention is equipment for sorting/recovering valuable materials from waste materials including used refractories, and as shown in FIG. , (I) a sieve 1a with an opening D ₁ for classifying the waste material, and (ii) a waste material on the sieve with this sieve 1a is crushed to a particle size that passes through the sieve with an opening D ₁ A crushing device 2a for crushing, and (iii) a sieve having an opening D ₂ smaller than the opening D ₁ for classifying the waste material crushed by the crushing device 2a together with the waste material under the sieve 1a and sieve 1b for, (iv) a crushing device 2b for the waste material became on the sieve is crushed to a particle size passing through a sieve having a mesh opening D ₂ in this sieve 1b, (v) mesh D A sieve having an opening D ₃ smaller than _2, and a sieve 1c for classifying the waste material crushed by the crusher 2b together with the waste material under the sieve 1b, and (vi) this sieve 1c There is a physical sorting device 3 for removing impurities by physically sorting the waste material that has been sieved on the screen. The details of each device constituting this equipment are as described above.

The second valuable material manufacturing method of the present invention is a valuable material manufacturing method in which a waste material containing a used refractory is used as a raw material, and the valuable material is selected and collected from this raw material, and is shown in FIG. Thus, the following steps (1) to (6) are included. The details of each step are the same as those of the second sorting and collecting method of the present invention described above.
(1) classified with a mesh opening D ₁ of the sieve 1a waste material.
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device 2a into particles having a particle size of D ₁ which passes through the sieve.
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve 1b having an opening D ₂ smaller than the opening D ₁ .
(4) The waste material on the sieve in step (3) is crushed by the crushing device 2b into particles having a particle size of D ₂ which passes through the sieve.
(5) Classify the waste material crushed in the step (4) together with the waste material under the sieve in the step (3) with a sieve 1c having an opening D ₃ smaller than the opening D ₂ and then sieving The fine powder that has become
(6) Impurities are removed from the waste material on the screen in step (5) by physical selection (physical selection device 3), and the waste material from which the impurities have been removed is recovered as a valuable resource.
According to the second method for producing a valuable material of the present invention, a valuable material can be produced with a high yield by using a waste material containing a used refractory material as a raw material.

FIG. 3 is an explanatory diagram showing a processing flow in the third sorting and collecting method and equipment of the present invention. The third sorting and recovering method of the present invention is a method suitable for separately sorting and recovering a valuable resource with a relatively large particle size and a small particle size, and has the following steps (1) to (6). is there.
(1) classified with a mesh opening D ₁ of the sieve 1a waste material.
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device 2 to a particle size that passes through the sieve having the opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve 1b having an opening D ₂ smaller than the opening D ₁ .
(4) Impurities are removed from the waste material screened in the step (3) by physical selection (physical selection device 3a), and the waste material from which the impurities have been removed is recovered as a valuable resource.
(5) The waste material that has been sieved down in step (3) is classified with a sieve 1c having a mesh size D ₃ smaller than the mesh size D ₂ , and the fine powder content under the sieve is removed.
(6) Impurities are removed by physical sorting (physical sorting device 3b) from the waste material on the screen in step (5), and the waste material from which the impurities have been removed is recovered as a valuable resource.
That is, in this sorting and collecting method, first, the waste material is classified by the sieve 1a (step (1)), only the sieve is crushed (step (2)), and the crushed material and the sieve bottom are further sieve 1b. (Step (3)), the impurities are removed by physical sorting on the sieve to recover valuable substances with a large particle size (step (4)), and the bottom of the sieve 1b is classified by the sieve 1c to obtain fine powder. After removing the components (step (5)), impurities are removed by physical screening to recover valuable substances having a small particle size (step (6)).

Also in this third sorting and collecting method of the present invention, if necessary, the metal removal treatment is performed before the step (1), and the sieve 1 (1a, 1b) used in the steps (1) and (3) ), details of the crushing device 2 used in the step (2), details of the physical sorting device 3 (3a, 3b) used in the steps (4) and (6), etc. are the same as those of the first sorting and collecting method of the present invention. Since it is the same, detailed description is omitted. However, as described above, the third sorting and collecting method of the present invention is a method suitable for separately sorting and collecting valuables with a relatively large particle size and a small particle size, and is a particle of a sorting target suitable for sorting. The diameter is about 10-40 mm for dry solid-gas fluidized bed type density sorting and about 2-10 mm for air table type density sorting, so it can be used for physical sorting in the step (4) of sorting and collecting valuable materials of relatively large particle size. Is particularly preferably dry-type solid-gas fluidized bed type density sorting, and air-table type density sorting is particularly preferable for physical sorting in the step (6) of sorting and recovering valuables having a relatively small particle size. Further, color selection is also suitable for selection of an object having a relatively large grain size, and is therefore particularly suitable for physical selection in step (4).

In the third sorting and collecting method of the present invention, for example, the waste material is classified by a sieve 1a having an opening of 40 mm, and only the waste material on the sieve in this classification is passed through the sieve having an opening of 40 mm by the crushing device 2. Crush to a particle size Then, the crushed waste material is classified together with the waste material under the sieve of the sieve 1a by the sieve 1b having an opening of 10 mm, and the waste material on the sieve by this classification is physically selected (physical selection). Impurities are removed by the device 3a), and the waste material from which the impurities have been removed is recovered as a valuable resource. On the other hand, the waste material which has been sieved by the classification of the sieve 1b is classified by the sieve 1c having an opening of 2 mm, and the fine powder content which has become the sieve is removed. Impurities are removed by physical sorting (physical sorting device 3b) from the waste material that has been sieved by the classification of the sieve 1c, and the waste material from which the impurities have been removed is recovered as a valuable resource. As described above, the physical sorting is preferably density sorting or color sorting. Among the density sorting, the physical sorting of the waste material on the sieve of the sieve 1b (physical sorting device 3a) is particularly a dry solid gas flow bed type. Density sorting is preferable, and air table type density sorting is particularly preferable for the physical sorting of the waste material on the sieve of the sieve 1c (physical sorting device 3b).

Further, for example, when the waste material is used blast furnace gutter refractory waste, the waste material on the sieve of the sieve 1b is preferably density sorted (particularly preferably dry solid gas flow bed type density sorted) or color sorted. Thus, the refractory waste is sorted into the adhered slag that is an impurity, the valuable metal line material (refractory), and the slag line material (refractory), and the valuable material is recovered. Further, the waste material on the sieve of the sieve 1c is also preferably density sorted (particularly preferably air table type density sorted) or color sorted, adhered slag in which the refractory waste is an impurity, and a valuable metal line material ( (Refractory) and slag line material (refractory) as well, and valuable materials are collected.

Here, when the dry solid gas fluidized bed type density sorting is applied to the physical sorting of the waste material on the sieve of the sieve 1b, the dry solid gas fluidized bed type density sorting is a lightweight material as described above. (Low-density products)-Since only heavy (high-density products) can be selected, density selection of refractory waste is performed twice. For example, the first time is lightweight slag + slag line material. And the metal line material, which is a heavy object, is selected, and the second time performed for the lightweight object selected in the first time is an operation for selecting the slag line material that is a heavy object and the attached slag that is a lightweight object. Depending on the case, the first time the adhered slag, which is a lightweight material, and the heavy-weight refractory waste (metal line material + slag line material) are selected, and the second time performed for this refractory waste is the heavy weight material. Alternatively, the metal line material that is a slag line material and the slag line material that is a lightweight material may be selected. Moreover, when air table type density sorting is applied to the physical sorting of the waste material on the sieve of the sieve 1c, as described above, this density sorting apparatus is used for light weight (low density)/medium quantity Since it is possible to sort products (medium density products) and heavy products (high density products), lightweight slag adhesion, medium weight slag line materials, and heavy metal line materials are selected. .. Regarding the metal line materials and slag line materials that have been sorted and collected as described above, in order to further improve the purity, (i) crushing → refractory by magnetic sorting (metal line materials or slag line materials) Material) and base steel, or (ii) crushing → classification → refractory (metal line material or slag line material) and base metal by magnetic selection of sieve material and sieve material. Done.

The sorting/recovery equipment used for carrying out the third sorting/recovering method of the present invention is equipment for sorting/recovering valuable materials from waste materials including used refractories, and as shown in FIG. , (I) a sieve 1a with an opening D ₁ for classifying the waste material, and (ii) the waste material on the sieve with this sieve 1a is crushed to a particle size that passes through the sieve with an opening D ₁ And (iii) a sieve having an opening D ₂ smaller than the opening D ₁ for crushing the waste material crushed by the crushing apparatus 2 together with the waste material under the sieve 1 a A sieve 1b for removing the impurities by (iv) physically sorting the waste material on the sieve with this sieve 1b, and (v) a mesh smaller than the opening D _2. A sieve with an opening D _{3 that} is a sieve 1c for classifying the waste material that has become the sieve under the sieve 1b, and (vi) the waste material that has become the sieve above the sieve 1c is physically selected to remove impurities. It has a physical sorting device (3b) for removal. The details of each device constituting this equipment are as described above.

A third valuable material manufacturing method of the present invention is a valuable material manufacturing method in which a waste material containing a used refractory is used as a raw material, and the valuable material is sorted and recovered from the raw material, and is shown in FIG. Thus, the following steps (1) to (6) are included. Details of each step are the same as those of the above-described third sorting and collecting method of the present invention.
(1) classified with a mesh opening D ₁ of the sieve 1a waste material.
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device 2 to a particle size that passes through the sieve having the opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve 1b having an opening D ₂ smaller than the opening D ₁ .
(4) Impurities are removed from the waste material screened in the step (3) by physical selection (physical selection device 3a), and the waste material from which the impurities have been removed is recovered as a valuable resource.
(5) The waste material that has been sieved down in step (3) is classified with a sieve 1c having a mesh size D ₃ smaller than the mesh size D ₂ , and the fine powder content under the sieve is removed.
(6) Impurities are removed by physical sorting (physical sorting device 3b) from the waste material on the screen in step (5), and the waste material from which the impurities have been removed is recovered as a valuable resource.
According to the third method for producing a valuable material of the present invention, a valuable material can be produced with a high yield by using a waste material containing a used refractory material as a raw material.

[Example 1]
FIG. 6 shows a processing flow of the comparative example. In this comparative example, used blast furnace gutter refractory waste with a particle size of 0-300 mm discharged from the blast furnace main gutter was ironed by a lifting magnet (recovery of metal ingots), and then crushed to a particle size of 40 mm or less with a jaw crusher. Then, fine powder having a particle size of 0-10 mm was removed by a sieve having an opening of 10 mm, and the refractory waste having a particle size of 10-40 mm was subjected to two dry solid gas fluidized bed type density screenings to obtain slag as an impurity, Sorted into slag line material and metal line material.

FIG. 7 shows a processing flow of the invention example. In this invention example, used blast furnace gutter refractory waste with a particle size of 0-300 mm discharged from the blast furnace main gutter is ironed with a lifting magnet (recovery of metal ingots), and then a sieve with an opening of 40 mm (sieve 1a) is used. The particles were classified into a particle size of 0-40 mm and a particle size of +40 mm, and only refractory waste having a particle size of +40 mm was crushed to a particle size of 40 mm or less with a jaw crusher (crushing device 2). Then, fine powder having a particle size of 0-10 mm was removed by a sieve having an opening of 10 mm (sieve 1b), and refractory waste having a particle size of 10-40 mm was subjected to two dry solid-gas fluidized bed type density sorting (physical sorting device). According to 3), impurities such as slag, slag line material, and metal line material were selected.

Table 2 shows a summary of particle size distributions after the jaw crusher crushing treatment in Comparative Examples and Invention Examples, and Table 3 shows the final recycling yield. According to Table 2, the refractory waste having a particle size of 10 to 40 mm that can be processed by density screening is about 9 mass% in the comparative example, while it is increased to about 21 mass% in the invention example. Since the comparative example and the inventive example have almost the same material balance in the density sorting (the ratio of valuables to be sorted and impurities. The same applies hereinafter), the inventive example also improves the final recycling yield as shown in Table 3. To do.

[Example 2]
FIG. 8 shows a processing flow of the comparative example. In this comparative example, used blast furnace gutter refractory waste with a particle size of 0-300 mm discharged from the blast furnace main gutter was ironed by a lifting magnet (recovery of metal ingots) and then crushed to a particle size of 40 mm or less with a jaw crusher. Then, it was crushed with a roll crusher to a particle size of 10 mm or less. Then, fine powder with a particle size of 0-2 mm is removed by a sieve with a mesh of 2 mm, and refractory waste with a particle size of 2-10 mm is converted into impurities such as slag, slag line material, and metal line material by air table type density sorting. Selected.

FIG. 9 shows a processing flow of the invention example. In this invention example, used blast furnace gutter refractory waste with a particle size of 0-300 mm discharged from the blast furnace main gutter is ironed with a lifting magnet (recovery of metal ingots), and then a sieve with an opening of 40 mm (sieve 1a) is used. The particles were classified into a particle size of 0-40 mm and a particle size of +40 mm, and only refractory waste having a particle size of +40 mm was crushed to a particle size of 40 mm or less by a jaw crusher (crushing device 2a). Then, after classifying with a sieve having an opening of 10 mm (sieving 1b) into a particle size of 0-10 mm and a particle size of 10-40 mm, only refractory waste having a particle size of 10-40 mm is subjected to a particle size of 10 mm with a roll crusher (crushing device 2b). After crushing and further removing fine powder with a particle size of 0-2 mm with a sieve with an opening of 2 mm (sieve 1c), refractory waste with a particle size of 2-10 mm is air table-type density sorting (physical sorting device). According to 3), it was classified into impurities such as slag, slag line material, and metal line material.

Table 4 shows a summary of the particle size distribution after roll crusher crushing for the comparative example and the invention example, and Table 5 shows the final recycling yield. According to Table 4, the refractory waste having a particle size of 2 to 10 mm that can be processed by density screening is about 76 mass% in the comparative example, while it is increased to about 87 mass% in the invention example. Since the comparative example and the invention example have almost the same material balance in density screening, the invention example also improves the final recycling yield as shown in Table 5.

[Example 3]
FIG. 10 shows a processing flow of the comparative example. In this comparative example, used blast furnace gutter refractory waste with a particle size of 0-300 mm discharged from the blast furnace main gutter was ironed by a lifting magnet (recovery of metal ingots) and then crushed to a particle size of 40 mm or less with a jaw crusher. Then, it is classified into a particle size of 10-40 mm and a particle size of 0-10 mm with a sieve having an opening of 10 mm, and the particle size of 0-10 mm is further analyzed with a sieve having an opening of 2 mm to have a particle size of 2-10 mm and a particle size of 0-. It was classified to 2 mm. Then, refractory scraps having a particle size of 10-40 mm are subjected to twice dry solid-gas fluidized bed density screening, and refractory scraps having a particle size of 2-10 mm are subjected to air-table density screening. Materials and metal line materials.

FIG. 11 shows a processing flow of the invention example. In this invention example, used blast furnace gutter refractory waste with a particle size of 0-300 mm discharged from the blast furnace main gutter is ironed with a lifting magnet (recovery of metal ingots), and then a sieve with an opening of 40 mm (sieve 1a) is used. After classifying to a particle size of 0-40 mm and a particle size of +40 mm, only refractory waste having a particle size of +40 mm was crushed to a particle size of 40 mm or less by a jaw crusher (crushing device 2). Then, the particles are classified into a particle size of 10-40 mm and a particle size of 0-10 mm by a sieve having a mesh size of 10 mm (sieve 1b), and the particle size of 0-10 mm is further classified by a sieve having a mesh size of 2 mm (sieve 1c). It was classified into 10 mm and a particle size of 0-2 mm. Then, the refractory waste having a particle diameter of 10-40 mm is subjected to the dry solid gas/fluidized bed type density sorting (physical sorting device 3a) twice to obtain the refractory waste having a particle diameter of 2-10 mm by the air table type density sorting (physical sorting device). According to 3b), slag, slag line material, and metal line material, which are impurities, were selected.

Table 6 shows a summary of the particle size distributions after the jaw crusher crushing treatment in Comparative Examples and Invention Examples, and Table 7 shows the final recycling yield. According to Table 6, the refractory waste having a particle size of 2 to 40 mm, which can be processed by the density screening, is about 86 mass% in the comparative example, whereas it is increased to 89 mass% in the invention example. Since the comparative example and the invention example have almost the same material balance in the density selection, the invention example also improves the final recycling yield as shown in Table 7.

1,1 Sieve 2,2a,2b Crushing device 3,3a,3b Physical sorting device 4 Separation tank 5 Gas injection part 6 Solid gas fluidized bed 7 Waste material supply part 8 Sediment recovery machine 9 Float recovery machine 10, 11 Discharge section 12 Table 80 Pulley 81 Endless belt 82 Scraper 90 Pulley 91 Endless belt 92 Scraper 110 Scraper 111 Discharge port 120 Waste material supply section 121 Waste material discharge section 121a, 121b, 121c Discharge section 122 Partition plate 123 Air hole x Heavy load ( High-density product)
y Lightweight products (low density products)
z Medium weight product (medium density product)

Claims (14)

It is a method of selecting and recovering valuable materials from waste materials that are used refractory scraps in the metal smelting process and are refractory scraps containing slag and/or metal that adheres or infiltrates in the smelting process ,
A method for selecting and recovering valuable materials from waste materials, which comprises the following steps (1) to (4).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ , and The fine powder content under the sieve is removed.
(4) Impurities are removed from the waste material on the screen in step (3) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource. It is a method of selecting and recovering valuable materials from waste materials that are used refractory scraps in the metal smelting process and are refractory scraps containing slag and/or metal that adheres or infiltrates in the smelting process ,
A method for sorting and recovering valuable materials from waste materials, which comprises the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2a) into particles having a particle size of D ₁ that passes through the sieve.
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) The waste material placed on the sieve in step (3) is crushed by the crushing device (2b) into particles having a particle size of D ₂ that passes through the sieve.
(5) The waste material crushed in step (4) is classified together with the waste material under the sieve in step (3) with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and The fine powder content under the sieve is removed.
(6) Impurities are removed from the waste material on the screen in step (5) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource. It is a method of selecting and recovering valuable materials from waste materials that are used refractory scraps in the metal smelting process and are refractory scraps containing slag and/or metal that adheres or infiltrates in the smelting process ,
A method for sorting and recovering valuable materials from waste materials, which comprises the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) Impurities are removed from the waste material on the screen in step (3) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource.
(5) The waste material under the sieve in the step (3) is classified with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and the fine powder content under the sieve is removed.
(6) Impurities are removed from the waste material on the screen in step (5) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource. Screening method of recovering valuable materials from the waste material according to claim 1, spent refractory debris, characterized in that a blast furnace trough refractories debris. The method for sorting and recovering valuable materials from waste materials according to any one of claims 1 to 4, wherein the density sorting is dry solid gas fluidized bed type density sorting or air table type density sorting. Equipment for sorting and recovering valuable materials from waste materials that are used refractory scraps in the metal smelting process and are slag and/or refractory scraps containing ingots that have adhered or infiltrated in the smelting process. Yes,
A sieve (1a) with an opening D ₁ for classifying waste materials,
The waste material became on the sieve with sieve (1a), crushing device for crushing a particle size passing through a sieve having a mesh opening D ₁ and (2),
A sieve having an opening D ₂ smaller than the opening D ₁ for classifying the waste material crushed by the crusher (2) together with the waste material under the sieve (1a) (1b )When,
A physical sorting device (3) for removing impurities by physically sorting the waste material on the sieve (1b) ,
The physical sorting device (3) is a density sorting device or a color sorting device, a facility for sorting and recovering valuable materials from waste materials. Equipment for sorting and recovering valuable materials from waste materials that are used refractory scraps in the metal smelting process, and are refractory scraps containing slag and/or metal that have adhered or infiltrated in the smelting process. Yes,
A sieve (1a) with an opening D ₁ for classifying waste materials,
The waste material became on the sieve with sieve (1a), crushing device for crushing a particle size passing through a sieve having a mesh opening D ₁ and (2a),
A sieve having an opening D ₂ smaller than the opening D ₁ for classifying the waste material crushed by the crushing device (2a) together with the waste material under the sieve (1a) (1b )When,
A crushing device (2b) for crushing the waste material on the screen of the sieve (1b) to a particle size that passes through the sieve having an opening D ₂ .
A sieve having an opening D ₃ smaller than the opening D ₂ for classifying the waste material crushed by the crushing device (2b) together with the waste material under the sieve (1b) (1c )When,
A physical sorting device (3) for removing impurities by physically sorting the waste material on the sieve (1c) ,
The physical sorting device (3) is a density sorting device or a color sorting device, and a sorting and collecting facility for valuables from waste materials. Equipment for sorting and recovering valuable materials from waste materials that are used refractory scraps in the metal smelting process, and are refractory scraps containing slag and/or metal that have adhered or infiltrated in the smelting process. Yes,
A sieve (1a) with an opening D ₁ for classifying waste materials,
The waste material became on the sieve with sieve (1a), crushing device for crushing a particle size passing through a sieve having a mesh opening D ₁ and (2),
A sieve having an opening D ₂ smaller than the opening D ₁ for classifying the waste material crushed by the crushing device (2) together with the waste material under the sieve (1a) (1b )When,
A physical sorting device (3a) for removing impurities by physically sorting the waste material on the sieve with the sieve (1b);
A sieve having an opening D ₃ smaller than the opening D _2, and a sieve (1c) for classifying the waste material under the sieve (1b),
A physical sorting device (3b) for removing impurities by physically sorting the waste material on the sieve (1c) ,
A facility for sorting and recovering valuable materials from waste materials, wherein the physical sorting device (3a) and the physical sorting device (3b) are density sorting devices or color sorting devices . 9. The facility for sorting and recovering valuable resources from waste materials according to claim 6, wherein the density sorting device is a dry solid-gas fluidized bed type density sorting device or an air table type density sorting device. Refractory scraps used in the metal smelting process, which are refractory scraps containing slag and/or ingots adhered or infiltrated in the smelting process are used as raw materials, and valuable materials are selected from the raw materials. a method for producing a valuable substance by recovering,
A method for producing a valuable resource using a waste material as a raw material, which has the following steps (1) to (4).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ , and The fine powder content under the sieve is removed.
(4) Impurities are removed from the waste material on the screen in step (3) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource. Refractory scraps used in the metal smelting process, which are refractory scraps containing slag and/or ingots adhered or infiltrated in the smelting process are used as raw materials, and valuable materials are selected from the raw materials. a method for producing a valuable substance by recovering,
A method for producing a valuable resource using a waste material as a raw material, which has the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2a) into particles having a particle size of D ₁ that passes through the sieve.
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) The waste material placed on the sieve in step (3) is crushed by the crushing device (2b) into particles having a particle size of D ₂ that passes through the sieve.
(5) The waste material crushed in step (4) is classified together with the waste material under the sieve in step (3) with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and The fine powder content under the sieve is removed.
(6) Impurities are removed from the waste material on the screen in step (5) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource. Refractory scraps used in the metal smelting process, which are refractory scraps containing slag and/or ingots adhered or infiltrated in the smelting process are used as raw materials, and valuable materials are selected from the raw materials. a method for producing a valuable substance by recovering,
A method for producing a valuable resource using a waste material as a raw material, which has the following steps (1) to (6).
(1) Classify the waste material with a sieve (1a) having openings D ₁ .
(2) The waste material placed on the sieve in step (1) is crushed by the crushing device (2) to a particle size that passes through the sieve having an opening D ₁ .
(3) The waste material crushed in the step (2) is classified together with the waste material under the sieve in the step (1) by a sieve (1b) having an opening D ₂ smaller than the opening D ₁ .
(4) Impurities are removed from the waste material on the screen in step (3) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource.
(5) The waste material under the sieve in the step (3) is classified with a sieve (1c) having an opening D ₃ smaller than the opening D ₂ , and the fine powder content under the sieve is removed.
(6) Impurities are removed from the waste material on the screen in step (5) by physical selection by density selection or color selection , and the waste material from which the impurities have been removed is recovered as a valuable resource. The used refractory waste is blast furnace gutter refractory waste, and the method for producing a valuable resource using waste materials as a raw material according to any one of claims 10 to 12 . 14. The method for producing a valuable resource using waste materials as a raw material according to claim 10, wherein the density sorting is dry solid-gas fluidized bed type density sorting or air table type density sorting.

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