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Method for removing noble metal impurities from iridium-containing material liquid

A precious metal and feed liquid technology, applied in the field of precious metal metallurgy, can solve the problems of poor discharge environment friendliness, deteriorating operating environment, and reduced iridium yield, and achieve the effects of strong promotion, high cleanliness, and easy recycling

Active Publication Date: 2017-01-11
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process either uses an organic phase with strong volatility and deteriorates the operating environment, or produces difficult-to-treat high-salt wastewater, and uses sulfides with poor environmental friendliness, which makes the iridium extraction process not environmentally friendly.
In addition, since iridium is similar in nature to platinum and rhodium and has strong inertness, it takes the above-mentioned process to remove impurities and needs to be repeated many times to meet the refining requirements, so that the yield of iridium is greatly reduced, and impurities containing platinum, palladium and rhodium are produced. It is difficult to recycle, and the utilization rate of precious metal resources cannot be fundamentally improved

Method used

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  • Method for removing noble metal impurities from iridium-containing material liquid
  • Method for removing noble metal impurities from iridium-containing material liquid
  • Method for removing noble metal impurities from iridium-containing material liquid

Examples

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Effect test

Embodiment 1

[0018] A method for removing noble metal impurities in an iridium-containing feed liquid, comprising the steps of:

[0019] (1) Adjust the pH=1 of the chloroiridic acid solution with a mass fraction of 40% sodium hydroxide solution, and the composition of the chloroiridic acid solution is as shown in Table 1;

[0020] (2) Raise the temperature of the iridium-containing feed solution with adjusted acidity to 65°C, and add D-sodium erythorbate to it. Add 1.9kg D-sodium erythorbate for every kilogram of Pd in ​​the sodium and iridium-containing liquid, react at a constant temperature of 65°C for 30 minutes, filter after cooling down, and the filtrate is set aside to produce a filter residue containing platinum+palladium>90%, which is chlorinated After extracting platinum and palladium;

[0021] (3) Heat the filtrate to 70°C, pass hydrogen into it under normal pressure, the flow rate of hydrogen is 400mL / min, react at a constant temperature of 70°C for 120min, cool down to room t...

Embodiment 2

[0029] A method for removing noble metal impurities in an iridium-containing feed liquid, comprising the steps of:

[0030] (1) Adjust the pH=1.5 of the chloroiridic acid solution with 30% sodium hydroxide solution, and the composition of the chloroiridic acid solution is shown in Table 1;

[0031] (2) Raise the temperature of the iridium-containing feed solution with adjusted acidity to 75°C, and add D-sodium erythorbate to it. Add 2.1kg of D-sodium erythorbate for every kilogram of Pd in ​​the sodium and iridium-containing liquid, react at a constant temperature of 75°C for 60 minutes, filter after cooling down, and use the filtrate to produce a filter residue containing platinum+palladium>90%, which is chlorinated After extracting platinum and palladium;

[0032] (3) Raise the temperature of the filtrate to 75°C, pass hydrogen into it under normal pressure, the flow rate of hydrogen is 600ml / min, react at a constant temperature of 75°C for 150min, cool down to room tempera...

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Abstract

The invention discloses a method for removing noble metal impurities from iridium-containing material liquid. The method comprises the following steps: (1) adjusting the acidity of the iridium-containing material liquid; (2) adding D-sodium isoascorbate under a thermal state to remove platinum and palladium impurities; (3) removing rhodium impurities by a hydrogen reduction method; and (4) refining and extracting iridium powder products. Compared with the prior art, the method has the advantages that the used reagent is environmentally friendly; the impurity removal efficiency is high; and the noble metal in the impurity precipitate slag has high grade and is easy to recycle. By the method, the yield of the obtained iridium reaches above 96%.

Description

technical field [0001] The invention belongs to the technical field of precious metal metallurgy, in particular to a method for efficiently cleaning and removing impurities of platinum, palladium and rhodium in a chloroiridic acid solution, and more specifically to a method for removing platinum, palladium, rhodium and other platinum group metals from a crude chloroiridic acid solution impurity method. Background technique [0002] Iridium is a rare metal and a member of the platinum group metals. Iridium is the most corrosion-resistant metal, and it cannot be corroded by general corrosive agents, including boiling aqua regia. Based on its unique corrosion resistance properties, iridium in the form of pure iridium, platinum-iridium alloy, and iridium-rhodium alloy is widely used in various demanding high-precision equipment such as corrosion-resistant crucibles, standard meter rulers, and kilogram prototypes. [0003] Iridium is one of the most difficult platinum group met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
CPCC22B11/04Y02P10/20
Inventor 潘从明谢振山陈治毓杨丽虹王立
Owner JINCHUAN GROUP LIMITED