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Method for separating and recycling iridium from iridium-containing waste catalyst

A waste catalyst, separation and recovery technology, applied in the field of recovery and separation of platinum group metal iridium, can solve the problems of large reagent consumption, low recovery rate of iridium, long process, etc., and achieve the effect of high recovery rate, lower production cost, and shortened cycle.

Inactive Publication Date: 2017-01-18
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are disadvantages such as long process, large consumption of reagents, and low recovery rate of iridium

Method used

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  • Method for separating and recycling iridium from iridium-containing waste catalyst

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Effect test

Embodiment 1

[0022] A method for separating and recovering iridium from iridium-containing spent catalysts, carried out according to the following steps:

[0023] (1) Roasting pretreatment: take 1000g of spent catalyst with an iridium content of 25.6%, and roast it at 450°C for 4 hours to remove carbon and other organic matter on the surface of the spent catalyst;

[0024] (2) Acid leaching: Slowly add 4L 30% HCl and 25% H to the roasted material 2 SO 4 The mixed acid was reacted for 2.5 hours to dissolve and remove the base metal impurities, and then filtered, and the insoluble residue was dried at 200°C for 24 hours to obtain the enrichment of iridium;

[0025] (3) High-temperature oxidation: put the enriched iridium into the tube furnace to raise the temperature to 1050°C, then pass in oxygen, and irradiate the oxygen in the tube furnace with ultraviolet rays for 6 hours, and collect the generated volatilization at the other end of the tube furnace Sexual substance IrO 3 , to separat...

Embodiment 2

[0030] A method for separating and recovering iridium from iridium-containing spent catalysts, carried out according to the following steps:

[0031] (1) Roasting pretreatment: Take 1000g of spent catalyst with an iridium content of 30.28%, and roast it at a temperature of 500°C for 5 hours to remove carbon and other organic matter on the surface of the spent catalyst;

[0032] (2) Acid leaching: Slowly add 4L 30% HCl and 25% H to the roasted material 2 SO 4 The mixed acid was reacted for 4 hours to dissolve and remove the base metal impurities, and then filtered, and the insoluble residue was dried at 200°C for 24 hours to obtain the enrichment of iridium;

[0033] (3) High-temperature oxidation: Put the enriched iridium into the tube furnace to heat up to 1100°C, then pass in oxygen, and irradiate the oxygen in the tube furnace with ultraviolet light to react for 7 hours, and collect the generated volatilization at the other end of the tube furnace Sexual substance IrO 3 ...

Embodiment 3

[0038] A method for separating and recovering iridium from iridium-containing spent catalysts, carried out according to the following steps:

[0039] (1) Roasting pretreatment: take 1,000 g of spent catalyst with an iridium content of 30.28%, and roast it at 600°C for 6 hours to remove carbon and other organic matter on the surface of the spent catalyst;

[0040] (2) Acid leaching: Slowly add 4L 30% HCl and 25% H to the roasted material 2 SO 4 The mixed acid was reacted for 4 hours to dissolve and remove the base metal impurities, and then filtered, and the insoluble residue was dried at 200°C for 24 hours to obtain the enrichment of iridium;

[0041] (3) High-temperature oxidation: Put the enriched iridium into the tube furnace to raise the temperature to 1150°C, then pass in oxygen, and irradiate the oxygen in the tube furnace with ultraviolet rays for 6 hours, and collect the generated volatilization at the other end of the tube furnace Sexual substance IrO 3 , to separa...

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Abstract

The invention relates to a method for separating and recycling iridium from an iridium-containing waste catalyst. The method comprises the six steps of roasting pretreatment, acid leaching, high-temperature oxidation, iridium trioxide decomposition, reduction, acid pickling and water washing. A strong oxidant is used for treating and recycling metal iridium from the iridium-containing waste catalyst, the strong oxidant O3 produces O2 through ultraviolet irradiation, the production cost is reduced, the oxidation reaction speed is reduced, the period is shortened, the technology is simple, and the method is environmentally friendly and high in iridium recycling rate.

Description

technical field [0001] The invention relates to a recovery and separation method for platinum group metal iridium, in particular to a method for recovering metal iridium from iridium-containing waste catalyst. Background technique [0002] Precious metals include gold, silver, platinum, palladium, rhodium, iridium, ruthenium, and osmium, among which the six elements of platinum, palladium, rhodium, iridium, ruthenium, and osmium are also called platinum group metals. Due to the scarcity of resources and unique properties, platinum group metals belong to the world's strategic reserve metals. [0003] Platinum group metal resources are highly concentrated in a few countries such as South Africa and Russia. my country's platinum group metal mineral resources are very poor. Therefore, it is necessary to develop an economical and environmentally friendly platinum group metal recovery process, which can not only make full use of resources, but also has Conducive to environmental s...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/02B22F9/22C22B1/02
CPCB22F9/22C22B1/02C22B7/001C22B7/009C22B11/026Y02P10/20
Inventor 李红梅熊庆丰贺小塘韩守礼吴喜龙谭文进李勇王欢赵雨刘文赵金成
Owner GUIYAN RESOURCE YIMEN
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