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A kind of technology of waste palladium catalyst reclaiming precious metal palladium

A palladium catalyst and precious metal technology, applied in the field of recovering precious metal color, can solve the problems of difficult leaching of precious metals, low recovery rate and the like, and achieve the effects of improving leaching rate, improving recovery rate and simple recovery process

Active Publication Date: 2022-07-12
石家庄绿色再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical problem of low recovery rate due to the difficulty of precious metal leaching in the above-mentioned prior art to recover precious metal palladium from waste palladium catalysts, and to provide a process for recovering precious metal palladium from waste palladium catalysts. Ignition oxidation and chlorination to oxidize the palladium in the spent catalyst into high-priced palladium that is easier to leach, improve the leaching rate of palladium and also improve the leaching efficiency, and finally achieve the purpose of improving the recovery rate

Method used

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  • A kind of technology of waste palladium catalyst reclaiming precious metal palladium

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Embodiment 1

[0028] A process for reclaiming precious metal palladium from a waste palladium catalyst, comprising the following steps:

[0029] S10 chlorination smelting step

[0030] S11: Weigh 1kg of the inactive palladium-containing catalyst as a raw material, and pulverize to 80 meshes. The content of precious metal palladium in the spent palladium-containing catalyst raw material is 620 g / t.

[0031] S12: Weigh 250 g of calcium chloride, 100 g of silicon dioxide, and 50 g of sodium nitrate according to the mass ratio of the invalid palladium-containing catalyst to calcium chloride, silicon dioxide and sodium nitrate of 20:5:2:1, and weigh the four The components are thoroughly mixed.

[0032] S13: Place the mixed material in a muffle furnace and smelt at a high temperature of 900° C. for 4 hours.

[0033] S20 hydrochloric acid leaching step

[0034] S21: Take out the smelted material, cool it, and then crush and grind it to 80 mesh.

[0035] S22: adding a hydrochloric acid soluti...

Embodiment 2

[0043] A process for reclaiming precious metal palladium from a waste palladium catalyst, comprising the following steps:

[0044] S10 chlorination smelting step

[0045] S11: Weigh 1 kg of the inactive palladium-containing catalyst as a raw material, and pulverize to 100 meshes. The content of precious metal palladium in the spent palladium-containing catalyst raw material is 620 g / t.

[0046] S12: Weigh 250 g of calcium chloride, 100 g of silicon dioxide, and 50 g of sodium nitrate according to the mass ratio of the invalid palladium-containing catalyst to calcium chloride, silicon dioxide and sodium nitrate of 20:5:2:1, and weigh the four The components are thoroughly mixed.

[0047] S13: Place the mixed material in a muffle furnace and smelt at a high temperature of 900°C for 4 hours.

[0048] S20 hydrochloric acid leaching step

[0049]S21: Take out the smelted material, cool it, and then crush and grind it to 100 mesh.

[0050] S22: adding a hydrochloric acid soluti...

Embodiment 3

[0058] A process for reclaiming precious metal palladium from a waste palladium catalyst, comprising the following steps:

[0059] S10 chlorination smelting step

[0060] S11: Weigh 1kg of the inactive palladium-containing catalyst as a raw material, and pulverize to 70 meshes. The content of precious metal palladium in the spent palladium-containing catalyst raw material is 620 g / t.

[0061] S12: Weigh 250 g of calcium chloride, 100 g of silicon dioxide, and 50 g of sodium nitrate according to the mass ratio of the inactive palladium-containing catalyst to calcium chloride, silicon dioxide and sodium nitrate of 20:5:2:1. The components are thoroughly mixed.

[0062] S13: Place the mixed material in a muffle furnace and smelt at a high temperature of 900° C. for 4 hours.

[0063] S20 hydrochloric acid leaching step

[0064] S21: Take out the smelted material, cool it, and then crush and grind it to 70 mesh.

[0065] S22: adding a hydrochloric acid solution with a mass con...

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Abstract

The invention discloses a process for recovering precious metal palladium from a waste palladium catalyst, comprising the following steps: mixing the spent palladium-containing catalyst with a chlorinating agent, an oxidant and a chlorination reaction catalyst, and smelting at a high temperature to convert low-price palladium into high-price chlorinated palladium Palladium salt; adding the smelted material to the hydrochloric acid solution, leaching, and filtering, the obtained palladium-containing filtrate; adding ammonium chloride to the palladium-containing filtrate under the heating bar until no more precipitation occurs, then filtering, and collecting the filter residue; adding to the filter residue Ammonia water is dissolved, hydrochloric acid is added for precipitation, and the filter residue is collected again; after ammonia water is dissolved, hydrazine hydrate is added to reduce to obtain sponge palladium. In the present application, divalent palladium is oxidized into tetravalent palladium through a smelting reaction, which improves the leaching rate, thereby improving the recovery rate, and the process is simpler than the existing recovery process and has low energy consumption.

Description

technical field [0001] The invention relates to the technical field of resource recovery and utilization, in particular to a process for recovering precious metal colors from waste palladium catalysts. Background technique [0002] Palladium is a rare metal widely used in various fields of modern industry and an important strategic resource. At present, the production quantity of palladium in my country is relatively small, which is far from meeting the needs and needs to rely on imports. Therefore, the treatment of waste palladium catalyst is of great significance to the recovery of precious metal palladium, which is of great significance to solve the shortage of palladium resources in my country. [0003] At present, the process of recovering precious metal palladium from waste palladium catalyst mainly includes the recovery process of wet process, pyro process or combination of pyro process and wet process. For example, the Chinese invention patent application with the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/08C22B11/06
CPCC22B7/007C22B1/08C22B11/048C22B11/06Y02P10/20
Inventor 石秋成陈龙周文斌王九飙秦邦保廖杰
Owner 石家庄绿色再生资源有限公司