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Method for separating and purifying platinum metals through solvent extraction

A technology of platinum group metals and extraction method, which is applied in the direction of improving process efficiency, can solve the problems of harming human health, large amount of waste liquid treatment, and low separation efficiency, so as to improve product yield and quality, and reduce the cost of platinum and palladium. Effect of high loss and separation rate

Inactive Publication Date: 2015-04-22
JINCHUAN GROUP LIMITED
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  • Claims
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Problems solved by technology

The selective precipitation method is simple to operate but the separation efficiency is not high. The solvent extraction method has a high separation efficiency but has high requirements for the pre-extraction liquid, a large amount of waste liquid treatment, and the organic phase is harmful to human health. Molecular recognition technology has been developed in recent years. High-tech separation technology, high separation efficiency but high requirements for some elements in the solution such as iron and sodium, limited material adaptability, and industrial application has not yet been realized
[0003] At present, in the process of separating platinum and palladium by extraction, a part of rhodium and iridium are also co-extracted into the loaded organic phase. During the stripping process, they enter the stripping solution along with platinum and palladium. It has reached about 30%, which reduces the yield of rhodium and iridium products and affects the quality of platinum and palladium products

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  • Method for separating and purifying platinum metals through solvent extraction

Examples

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Embodiment 1

[0029] Precious metal concentrate is chlorinated by chlorine gas (23L / h) for 40 minutes, the liquid-solid mass ratio is 4:1, then the acidity is adjusted to 2.5mol / L with hydrochloric acid, heated to 80°C by chlorine gas (25L / h) to dissolve, and the Time 8 hours. After finely filtering the solution to remove the insoluble residue, the volume of the filtrate is 400L (precious metal content is 18g / L), the solution is reinforced with alkali to adjust the pH value to 1, and when it is heated to 90°C, 14kg of ammonium oxalate is added under stirring, and a light blue color is immediately produced in the solution Color precipitated, and continued stirring and heating to 95 ° C when additional 0.5kg ammonium oxalate was added, no obvious precipitation was formed. Keep warm for 30 minutes, cool to 30°C and filter, wash the filter residue with 20L deionized water for 4 times, stir the filtrate and heat it to 70°C, then add 24kg of organic reducing agent vitamin C, at this time, a large...

Embodiment 2

[0031] The volume of the residual gold extraction solution is 500L (precious metal content is 20g / L), the solution is reinforced with alkali to adjust the pH value to 1.05, and when it is heated to 92°C, add 14kg of ammonium oxalate while stirring, and a light blue precipitate will immediately appear in the solution, and continue to stir and heat Add 0.6kg of ammonium oxalate to 95°C, no obvious precipitation is formed. Keep warm for 35 minutes, cool to 25°C and filter, wash the filter residue with 30L deionized water for 3 times, stir and heat the filtrate to 74°C, then add 24kg of organic reducing agent vitamin C, at this time, a large amount of gray-black precipitates are formed, keep warm and stir for 25 Minutes later, cool to 23°C and filter. The filter residue is washed 3 times with 30L deionized water. The filter residue is dissolved in aqua regia to adjust the acidity. After extracting palladium with diisoamyl sulfide to separate platinum and palladium, add 1.1kg di Ma...

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Abstract

The invention provides a method for separating and purifying platinum metals through solvent extraction, relates to a metal separating and purifying method, and particularly relates to a method for separating platinum, palladium, rhodium and iridium from a solution, slag or secondary resource containing platinum metals. The method is characterized in that the purifying process comprises the following steps: (1) chloridizing and dissolving materials containing platinum metals; (2) adding ammonium oxalate to perform copper-nickel precipitation separation; (3) adding organic reducing agent vitamin C to perform platinum-palladium precipitation reaction; (4) performing aqua regia dissolution and denitration on the platinum-palladium-containing precipitation slag, and feeding into a diisoamyl thioether platinum-palladium extraction separation procedure; and (5) adding manganese dioxide and introducing chlorine gas into the rhodium-iridium-containing filtrate, reacting, and feeding into a tributyl phosphate rhodium-iridium extraction separation procedure. According to the method provided by the invention, the platinum-palladium and rhodium-iridium separation rates are high, and further platinum-palladium separation and rhodium-iridium separation can be realized easily through subsequent extraction; after conventional refining, platinum black and palladium black of which the purities are above 99.99% can be produced, and spongy platinum and spongy palladium products meeting the national standard have been produced after treatment of subsequent procedures; and the purities of the produced rhodium powder and iridium powder can be up to 99.95%.

Description

technical field [0001] The invention relates to a method for separating and purifying platinum group metals by a solvent extraction method, relating to a method for separating and purifying metals, especially a method for separating and separating platinum, palladium, rhodium and iridium from solutions containing platinum group metals, slag or secondary resources. Background technique [0002] Due to the similar properties of platinum, palladium, rhodium, and iridium among platinum group metals, there are great difficulties in the separation process, especially the separation of platinum and rhodium, which is a recognized worldwide problem. Commonly used separation methods include selective precipitation, solvent extraction, and molecular recognition. The selective precipitation method is simple to operate but the separation efficiency is not high. The solvent extraction method has a high separation efficiency but has high requirements for the pre-extraction liquid, a large ...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/26
CPCY02P10/20
Inventor 马玉天潘从明冯岩郭晓辉李明陈云峰刘林孙渊君
Owner JINCHUAN GROUP LIMITED
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