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Method for recovering iridium from waste materials and residues

A residue and waste technology, which is applied in the field of iridium recovery from waste and residue, can solve the problems of short time required, low energy consumption, and high purity of iridium powder, and achieve the effects of short time, low energy consumption, and high purity

Inactive Publication Date: 2020-11-20
陕西瑞科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional method adopted cannot completely convert the solid elemental iridium into an ionic liquid during the dissolution process, and cannot effectively remove precious metals such as platinum and rhodium during the purification process. Although the traditional method is very complicated, it is generally considered to be The best method for the separation of precious metals, the present invention attempts to find a new method of recovering iridium from waste and residues, which requires less time and less energy than the methods usually used in the precious metal industry, and the obtained iridium powder high purity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A method for reclaiming iridium from waste and residue, specifically implemented according to the following steps:

[0059] Step 1. Waste pretreatment

[0060] Put the collected iridium-containing waste or residue and activated carbon into a stainless steel box and stir evenly, then put the stainless steel box containing the mixture into a muffle furnace for roasting, and wait for all organic matter to be removed. Ash;

[0061] In step 1, the temperature of roasting in the muffle furnace is: 600°C, and the time of roasting in the muffle furnace is: 6 hours;

[0062] Step 2. Zinc chips

[0063] Mix the iridium ash obtained in step 1 with a certain amount of zinc powder evenly, then roast in a muffle furnace, ball-mill the mixed material after cooling, and then mix the ball-milled mixed material with a certain amount of hydrochloric acid with a mass concentration of 10% , stirred, and reacted at normal temperature to remove all zinc to obtain iridium-containing active ...

Embodiment 2

[0086] A method for reclaiming iridium from waste and residue, specifically implemented according to the following steps:

[0087] Step 1. Waste pretreatment

[0088] Put the collected iridium-containing waste or residue and activated carbon into a stainless steel box and stir evenly, then put the stainless steel box containing the mixture into a muffle furnace for roasting, and wait for all organic matter to be removed. Ash;

[0089] In step 1, the temperature of roasting in the muffle furnace is: 750°C, and the time of roasting in the muffle furnace is: 8 hours;

[0090] Step 2. Zinc chips

[0091] Mix the iridium ash obtained in step 1 with a certain amount of zinc powder evenly, then roast in a muffle furnace, ball-mill the mixed material after cooling, and then mix the ball-milled mixed material with a certain amount of hydrochloric acid with a mass concentration of 10% , stirred, and reacted at normal temperature to remove all zinc to obtain iridium-containing active ...

Embodiment 3

[0114] A method for reclaiming iridium from waste and residue, specifically implemented according to the following steps:

[0115] Step 1. Waste pretreatment

[0116] Put the collected iridium-containing waste or residue and activated carbon into a stainless steel box and stir evenly, then put the stainless steel box containing the mixture into a muffle furnace for roasting, and wait for all organic matter to be removed. Ash;

[0117] In step 1, the temperature of roasting in the muffle furnace is: 650°C, and the time of roasting in the muffle furnace is: 7 hours;

[0118] Step 2. Zinc chips

[0119] Mix the iridium ash obtained in step 1 with a certain amount of zinc powder evenly, then roast in a muffle furnace, ball-mill the mixed material after cooling, and then mix the ball-milled mixed material with a certain amount of hydrochloric acid with a mass concentration of 10% , stirred, and reacted at normal temperature to remove all zinc to obtain iridium-containing active ...

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Abstract

The invention discloses a method for recovering iridium from waste materials and residues. The method specifically comprises the following steps of S1, pretreating the waste materials; S2, zinc crushing; S3, carrying out oxidation leaching treatment on the iridium-containing active ash obtained in the step 2 to obtain iridium-containing filtrate; S4, carrying out oxidation iridium precipitation treatment on the iridium-containing filtrate obtained in the step 3 to obtain (NH4) IrCL6 precipitate; S5, reducing and dissolving hydrazine hydrate; S6, purifying ammonium sulfide; S7, carrying out secondary oxidation iridium precipitation to obtain (NH4) IrCl6 crystals; and S8, carrying out calcination-hydrogen reduction treatment on the (NH4) IrCl6 crystal obtained in the step 7 to obtain iridiumpowder. Compared with a method generally adopted in the precious metal industry, the method is short in required time and low in energy consumption, and the obtained iridium powder is high in purity.

Description

technical field [0001] The invention belongs to the technical field of resource regeneration of precious metal iridium contained in industrial waste and residue, and in particular relates to a method for recovering iridium from waste and residue. Background technique [0002] Iridium is a member of the platinum group IX group elements in the sixth period. As a noble metal element, iridium is the most corrosion-resistant metal because of its excellent physical and chemical properties such as acid and alkali resistance and oxidation resistance. At present, the traditional method adopted cannot completely convert the solid elemental iridium into an ionic liquid during the dissolution process, and cannot effectively remove precious metals such as platinum and rhodium during the purification process. Although the traditional method is very complicated, it is generally considered to be The best method for the separation of precious metals, the present invention attempts to find a ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B11/00
CPCC22B1/02C22B7/007C22B11/042Y02P10/20
Inventor 杜继山周淑雁史晓妮
Owner 陕西瑞科新材料股份有限公司
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