JP7137532B2 - Metal-containing waste treatment apparatus and treatment method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a treatment apparatus and treatment method for metal-containing waste, and more particularly to a technique for mainly recovering precious metals from incineration ash, shredder dust, and the like.

In order to recover valuable metals such as precious metals from waste such as incineration ash, Patent Document 1 discloses that after pretreatment of incineration ash, etc., the operating conditions of a vertical roller mill are adjusted, and precious metals are transferred to the stone discharge side of the mill. Techniques for migration and recovery are described.

On the other hand, in order to recover precious metals and the like from shredder dust and the like, Patent Document 2 describes a technique for sorting heated shredder dust and concentrating precious metals and the like in heavy products separated by an air table and recovering them. there is

Japanese Patent No. 6375205 JP 2018-164872 A

In the inventions described in Patent Documents 1 and 2 above, mill effluent and heavy products in which precious metals and the like are concentrated contain particles of aluminum (pure Al, Al alloy) and glass with a density of 3 t/m ³ or less. ash or glass may adhere to the surface of the particles. For example, the mill scum of Patent Document 1 contains 20% or more of aluminum, and the heavy product of Patent Document 2 contains several percent of aluminum. As a result, there is a possibility that the grade of precious metals in the mill waste and heavy products may be degraded.

Therefore, if the heavy products and the like are further sorted into light products and heavy products by specific gravity, the presence of the precious metals that migrate to the light products may result in a decrease in the recovery rate of the precious metals. For example, when the contamination of aluminum and glass is prevented by specific gravity sorting to improve the grade of precious metals in heavy products, the recovery amount of heavy products decreases, resulting in a problem of lower recovery rate.

Further, when trying to recover conductive products containing a large amount of precious metals by eddy current sorting, glass can be removed as non-conductive products, but aluminum is recovered as conductive products together with precious metals and the like. In particular, when ash adheres to precious metals, the effect of eddy current sorting is limited.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-described problems in the prior art, and an object of the present invention is to efficiently recover mainly precious metals from metal-containing waste.

In order to achieve the above object, the present invention provides a metal-containing waste treatment apparatus, which is a precious metal concentrate obtained by sorting metal-containing waste, comprising Si (silicon) and Ca (calcium) The total content of 5 mass% to 30 mass%, and the total content of Al (aluminum) and Cu (copper) is 20 mass% to 60 mass%. a crusher for crushing non-magnetic substances separated by the magnetic separator; and a separator for removing fine particles from the crushed material crushed by the crusher.

According to the present invention, it is possible to remove fine particles such as aluminum, glass, and ash that cause deterioration of noble metal quality from the noble metal concentrate, so that the noble metal concentration of the noble metal concentrate can be increased.

The metal-containing waste treatment apparatus is provided with a circulation route that returns the coarse particles separated by the sorter to the crusher, and the coarse particles are crushed again to further increase the precious metal concentration of the crushed material to be recovered. can be enhanced.

The present invention also provides a method for treating metal-containing waste, which is a precious metal concentrate obtained by sorting metal-containing waste, wherein the total content of Si and Ca is 5% by mass or more and 30 a step of magnetically sorting a precious metal concentrate having a mass% or less and a total content of Al and Cu of 20 mass% or more and 60 mass% or less, and crushing a non-magnetic substance obtained by the magnetic sorting; It is characterized by comprising a step of removing fine particles from the crushed material obtained by the crushing. According to the present invention, the noble metal concentration of the noble metal concentrate can be increased by removing fine particles such as aluminum, glass, and ash from the noble metal concentrate.

In the above method for treating metal-containing waste, the coarse particles after removing the fine particles are crushed again, and the fine particles are removed from the crushed material obtained by the crushing, so that the collected crushed material has a precious metal concentration. can be further increased.

As described above, according to the present invention, mainly noble metals can be efficiently recovered from metal-containing waste.

1 is a block diagram showing an embodiment of a metal-containing waste treatment apparatus according to the present invention; FIG.

Next, the metal-containing waste treatment apparatus according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a metal-containing waste treatment apparatus according to the present invention. This treatment apparatus 1 magnetically separates a precious metal concentrate obtained by sorting metal-containing waste. machine (hereinafter referred to as "magnetic separator") 2, a crusher 3 for crushing non-magnetic substances separated by the magnetic separator 2, and a sieve separator 4 for removing fine particles from the crushed material crushed by the crusher 3. and a circulation route 5 for returning the sieved material separated by the sieve sorter 4 to the crusher 3.

Precious metal concentrates to be treated are wastes containing metals such as incineration ash and shredder dust that are sorted and processed to concentrate precious metals, and are the total content of silicon (Si) and calcium (Ca). is 5% by mass to 30% by mass, preferably 5% by mass to 20% by mass, and the total content of Al and copper (Cu) is 20% by mass to 60% by mass, preferably 30% by mass to 50% by mass. % or less, and mean particle size is 10 mm or less.

The magnetic separator 2 is provided to separate the precious metal concentrate into magnetic substances and non-magnetic substances, preferably of a hanging type, and a magnetic flux density of 700 gauss or more and 5000 gauss or less can be used. .

The crusher 3 is provided to separate the particles of Al, Si and Ca from the surfaces of the non-magnetic particles, and the crushing method is not particularly limited, regardless of whether it is a dry method or a wet method. However, over-pulverization should be avoided because it wears out the equipment and is not suitable for shifting the noble metal to the fine particle side in the sieve separator 4 . Even if a wet crusher is used, the non-magnetic substances to be treated are mainly metal, slag, and glass, and the amount of eluted components is small, so the addition of water treatment is not large.

The sieve separator 4 is provided to remove fine particles having a particle size of about 0.5 mm or less. Instead of the sieve sorter 4, a classifier or a wind sorter may be used.

Next, the operation of the processing apparatus 1 having the above configuration will be described with reference to FIG.

Magnetic substances contained in the received precious metal concentrate are removed by a magnetic separator 2, and non-magnetic substances discharged from the magnetic separator 2 are crushed by a crusher 3. Fine particles discharged from the crusher 3 and containing a large amount of Al, Si and Ca are removed by the sieve separator 4 as under-sieved material.

Through the circulation route, the coarse particles separated by the sieve separator 4 are returned to the crusher 3 as the sieved material, and the crushing by the crusher 3 and the sieve separation by the sieve separator 4 are repeated.

By finally recovering the coarse particles as the screened material as described above, it is possible to increase the precious metal quality of the collected screened material.

Next, test examples of the present invention will be described.

As sample 1, a precious metal concentrate obtained by sorting incinerated ash was used, and as sample 2, a precious metal concentrate obtained by sorting heated shredder dust was used. After removing such foreign matter, the mixture was washed with water and crushed with a crusher (MX1200XTM (crushing container CAC90B) manufactured by WARING) at a solid-liquid ratio of 1:5. After crushing for 10 seconds, it was sieved with a sieve mesh of 0.5 mm. Each sieved material was again washed with water, crushed, and sieved again. This was repeated 3 times. After the iterations were completed, the sieves were dried and analyzed for composition. Table 1 shows the component analysis values of sample 1 before and after treatment, Table 2 shows the component analysis values of sample 2 before and after treatment, and Table 3 shows the concentration ratio of precious metals and the like of each sample after treatment.

As shown in Tables 1 to 3, the concentration rate of precious metals Au (gold), Ag (silver) and Pd (palladium) and Cu is as high as about 130%, and other metals (Al, Si and Ca) It can be seen that the concentration rate decreased to about 25 to 70%, and precious metals and the like were further concentrated.

In the above-described embodiment, the circulation route 5 is preferably provided to improve the quality of the recovered sieved material, but it is not always necessary to provide the circulation route 5. It is also possible to use the coarse grain fraction as it is as a processed material.

1 Metal-containing waste treatment device 2 Magnetic separator 3 Crusher 4 Sieve separator 5 Circulation route

Claims (4)

A precious metal concentrate obtained by sorting metal-containing waste, having a total Si and Ca content of 5% by mass or more and 30% by mass or less, and a total Al and Cu content of 20% by mass. A magnetic sorter for magnetically sorting precious metal concentrates of 60% by mass or more;
a crusher for crushing non-magnetic substances separated by the magnetic separator;
An apparatus for treating metal-containing waste, comprising a sorter for removing fine particles from crushed materials crushed by the crusher. 2. The apparatus for treating metal-containing waste according to claim 1, further comprising a circulation route for returning coarse particles separated by said sorter to said crusher. A precious metal concentrate obtained by sorting metal-containing waste, having a total Si and Ca content of 5% by mass or more and 30% by mass or less, and a total Al and Cu content of 20% by mass. a step of magnetically sorting a precious metal concentrate having a concentration of 60% by mass or more;
crushing the non-magnetic substances obtained by the magnetic selection;
A method for treating metal-containing waste, comprising the step of removing fine particles from the crushed material obtained by the crushing. 4. The method for treating metal-containing waste according to claim 3, wherein the coarse particles after removing the fine particles are crushed again, and the fine particles are removed from the crushed material obtained by the crushing.

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