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A method for removing precious metal impurities in iridium-containing feed liquid

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

Active Publication Date: 2018-04-10
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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  • A method for removing precious metal impurities in iridium-containing feed liquid
  • A method for removing precious metal impurities in iridium-containing feed liquid
  • A method for removing precious metal impurities in iridium-containing feed liquid

Examples

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Embodiment 1

[0018] A method for removing precious metal impurities in an iridium-containing material liquid, including the following steps:

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

[0020] (2) Increase the temperature of the iridium-containing material liquid with adjusted acidity to 65°C, and add D-sodium erythorbate to it. The amount of D-sodium erythorbate is: 2.3kg D-isoascorbic acid per kilogram of Pt in the iridium-containing material liquid Add 1.9kg of D-sodium erythorbate per kilogram of Pd to the sodium and iridium-containing material solution, react at 65°C for 30 minutes, and filter after cooling. The filtrate is ready for use to produce platinum + palladium> 90% of the filter residue, after chlorination to make liquid, extract platinum and palladium;

[0021] (3) The filtrate was heated to 70°C, and hydrogen was introduced into i...

Embodiment 2

[0029] A method for removing precious metal impurities in an iridium-containing material liquid, including the following steps:

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

[0031] (2) Raise the temperature of the iridium-containing material liquid with adjusted acidity to 75°C, add D-sodium erythorbate to it, and the amount of D-sodium erythorbate: add 2.5kg D-isoascorbic acid per kilogram of Pt in the iridium-containing material liquid Add 2.1kg of D-sodium erythorbate per kilogram of Pd to the sodium and iridium-containing material solution, react at a constant temperature of 75°C for 60 minutes, and filter after cooling. The filtrate is ready for use to produce platinum+palladium 90% of the filter residue, after chlorination to make liquid, extract platinum and palladium;

[0032] (3) The filtrate was heated to 75°C, and hydrogen was introduced into i...

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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, and specifically relates to an efficient and clean removal method of platinum, palladium and rhodium impurities in a chloroiridic acid solution, and more specifically to a method for removing platinum, palladium and rhodium and other platinum group metals from a crude chloroiridic acid solution Methods of impurities. Background technique [0002] Iridium is a rare metal and one of the platinum group metals. Iridium is the most corrosion-resistant metal and cannot be corroded by common corrosive agents, including boiling aqua regia. Based on its unique corrosion resistance, iridium in the form of pure iridium, platinum-iridium alloy, iridium-rhodium alloy is widely used in all kinds of demanding corrosion-resistant crucibles, standard meters, kilograms and other high-precision equipment. [0003] Iridium is one of the most difficult platinum group metals to extract. At present, to re...

Claims

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Application Information

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Patent Type & Authority Patents(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