Method for preparing high-purity platinum from platinum alloy waste

A platinum alloy and scrap technology, applied in the field of preparing high-purity platinum powder, can solve the problems of high equipment requirements, high smelting loss, and impracticability, and achieve the effects of improving purity, shortening the process, and reducing pollution

Active Publication Date: 2020-11-13
CHONGQING MATERIALS RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In foreign countries, the physical method of regional smelting is often used to prepare high-purity platinum. This method has extremely high requirements on equipment, and the smelting loss is high. When the amount is small, the cost is high, so it is difficult to be widely used in actual industrial production.
[0004] At present, the existing technology of directly purifying platinum powder from platinum alloys, the purity of the prepared platinum powder is only about 99.99%, which cannot be achieved for higher purity requirements

Method used

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  • Method for preparing high-purity platinum from platinum alloy waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Primary hydrolysis:

[0044] Weigh 100.05g of platinum-rhodium alloy waste with a rhodium content of 8%, cut it short with scissors to make a "Z" shape, place it in a 5000ml beaker, add 1500ml of dilute aqua regia to heat and dissolve, add 500ml of dilute aqua regia, and the alloy Dissolve completely, concentrate until crystal film appears on the liquid surface, add concentrated hydrochloric acid to catch up with nitrate until no reddish-brown gas is produced, add 60g of sodium chloride solid, evaporate to dryness, add water to dissolve, and obtain platinum-rhodium solution, boil, and use a mass concentration of 10% chlor-alkali is used to adjust the pH to 8, precipitate rhodium precipitation, stand still for about 20 hours, filter to obtain filtrate 1, precipitate and recover rhodium, and a small amount of platinum adsorbed on the precipitate to reduce the loss of precious metal platinum and rhodium;

[0045] 2. Secondary hydrolysis:

[0046] Concentrate the filtra...

Embodiment 2

[0061] 1. Primary hydrolysis:

[0062] Weigh 120.11g of platinum-iridium alloy waste with an Ir content of 5%, cut it short with scissors to make a "Z" shape, place it in a 5000ml beaker, add 1500ml of dilute aqua regia to dissolve, add 300ml of dilute aqua regia, and the alloy is completely Dissolve and concentrate until a crystal film appears on the liquid surface, add concentrated hydrochloric acid to catch the nitrate until no reddish-brown gas is produced, add 45g of sodium chloride solid, evaporate to dryness, add deionized water to dissolve, and obtain a platinum-iridium solution. The concentration is 20% chlor-alkali to adjust pH=10, precipitate iridium precipitate, stand for about 20 hours, filter to obtain filtrate 1, precipitate and recover rhodium, and a small amount of platinum adsorbed on the precipitate, reducing the loss of precious metal platinum iridium;

[0063] 2. Secondary hydrolysis:

[0064] Concentrate the filtrate 1 to about 200ml, add water 100ml con...

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Abstract

The invention relates to a method for preparing high-purity platinum powder from platinum alloy waste. According to the method, hydrolysis and carrier adding hydrolysis are adopted for preliminarily separating platinum and other alloy elements, ion exchange is achieved, a precipitator is added for hydrolysis ion exchange is achieved, hydrazine hydrate reduction is achieved to remove other impurities, and high-purity platinum larger than or equal to 99.999% is extracted. The method is high in universality, can be effectively implemented by aiming at most platinum alloys and has the advantages that operation is simple, environment friendliness is achieved, process stability is high, and no special requirement is made for equipment.

Description

technical field [0001] The invention belongs to the field of recovery and purification of precious metals, in particular to a method for preparing high-purity platinum powder from waste materials such as platinum-rhodium and platinum-iridium alloys. Background technique [0002] Platinum and various platinum alloy materials are widely used in various fields of industry because of their unique electrical, magnetic, optical, corrosion resistance, high temperature and oxidation resistance properties, and have become industrial sensors, microelectronic components, semiconductor devices, anti-corrosion Key materials in fields such as cancer drugs and medical electrodes. The realization of high-quality production of such materials is extremely dependent on high-purity platinum powder as a raw material. Therefore, the preparation of high-purity platinum is a fundamental and important technology in the field of precious metals. In addition, my country is a country poor in precious ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00B22F9/24
CPCC22B11/042C22B7/006B22F9/24Y02P10/20
Inventor 冉义斌罗凤兰梁源玲吴保安唐会毅肖雨辰郭卫民
Owner CHONGQING MATERIALS RES INST
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