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Method for removing precious metal impurities in iridium-containing feed liquid

A technology for precious metals and impurities, which is applied in the field of removing precious metal impurities in iridium-containing liquids. It can solve the problems that it is difficult to dissolve metals and obtain iridium powder with qualified purity, so as to achieve good recovery rate and reduce dispersion and loss.

Pending Publication Date: 2022-03-18
泸西县扩铂贵金属有限公司
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Problems solved by technology

Therefore, the precious metal iridium is often accompanied by other elements in the production and refining process, and it is difficult to obtain qualified iridium powder with higher purity.
Traditional iridium recovery processes are difficult to dissolve metal iridium

Method used

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  • Method for removing precious metal impurities in iridium-containing feed liquid

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Embodiment

[0027] Example: see figure 1 Shown a kind of removal method containing the precious metal impurity in the iridium feed liquid, comprises the following steps:

[0028] S1, aqua regia oxidation: use a strong oxidant to oxidize and remove organic matter in the iridium-containing feed solution;

[0029] S2, hydrolysis: a small amount of organic matter is not decomposed during the oxidation and decomposition of organic matter in aqua regia, and there are a large amount of soluble salt in the iridium waste liquid, and the residual organic matter and most of the soluble salt are removed by hydrolysis;

[0030] S3, iridium oxide precipitation: transfer the iridium-containing solution to an evaporator and heat to boil, add oxidant while concentrating: double H 2 o 2 、H 3 NO 3 , then add ammonium chloride, the iridium precipitates completely, catch acid and filter, wash with 15% ammonium chloride solution to light color, drain (NH 4 )IrCl 6 ; Iridium mother liquor re-precipitation...

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Abstract

The invention relates to the technical field of precious metal metallurgy, in particular to a method for removing precious metal impurities in iridium-containing feed liquid, which comprises the following steps: S1, oxidizing aqua regia: oxidizing and removing organic matters in the iridium-containing feed liquid by using a strong oxidant; s2, hydrolysis: in the process of oxygenolysis of organic matters by aqua regia, a small amount of organic matters are not decomposed, meanwhile, a large amount of soluble salts exist in the iridium waste liquid, and residual organic matters and most of the soluble salts are removed through hydrolysis; s3, oxidizing and precipitating iridium; s4, hydrazine hydrate reduction dissolution; s5, ammonium sulfide purification; s6, calcining and hydrogen reduction; organic matters are oxidized and damaged by aqua regia according to the special properties of materials, transformation of a solution medium is achieved, the problem that iridium is difficult to dissolve is avoided, chloroiridic acid is directly calcined to produce the iridium powder in the production process of the iridium powder, dispersion and loss of iridium are reduced, precious and base metals are ingeniously removed by using the characteristic that ammonium chloride is used for precipitating iridium after a sub-oxidant is added, and the production cost is reduced. The purity of the prepared iridium powder is good, and the recovery rate reaches up to 99.95%.

Description

technical field [0001] The invention relates to the technical field of precious metal metallurgy, in particular to a method for removing precious metal impurities in iridium-containing feed liquid. Background technique [0002] Due to its high price and low output, iridium is usually only used as an additive element except for special use. Therefore, precious metal iridium is often accompanied by other elements in the production and refining process, and it is difficult to obtain qualified iridium powder with higher purity. Traditional iridium recovery processes are difficult to dissolve metallic iridium. In this plan, a method for removing precious metal impurities in iridium-containing feed liquid is proposed. The process of dissolving iridium to make liquid can greatly increase the dissolution rate of iridium. At the same time, through oxidation leaching, ammonium chloride precipitation of iridium, Purification and other processes to obtain iridium powder with higher pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/06C22B3/44
CPCC22B11/042C22B3/06C22B3/44Y02P10/20
Inventor 王成成段世雄施秋杰杨斌朱富贵李国庆
Owner 泸西县扩铂贵金属有限公司
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