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A kind of recovery purification method of high-purity rhodium

A purification method and high-purity technology, which is applied in the field of recovery and purification of precious metals, can solve the problems of large environmental pollution, low recovery purity, and difficulty in separation and purification, and achieve the effects of low cost, high product purity, and simple operation

Inactive Publication Date: 2016-08-24
兰州金川贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, the rhodium recovery solution not only contains a large amount of impurities such as sodium, potassium, aluminum, iron, nickel, copper, calcium, etc., but also contains some other platinum group metals. Due to the similar chemical properties, the interaction between these platinum group metals Separation and purification are difficult, and the recovery and purification methods have harsh process conditions, large environmental pollution, and low recovery purity. How to recover and purify these waste materials to obtain high-purity rhodium powder or rhodium compounds has become a problem that needs to be solved in rhodium recovery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Control the acid concentration of the rhodium leaching solution to be recovered to 6-8mol / L and carry out heating and reflux for 24h, adjust the concentration of the rhodium solution, measure the rhodium concentration to be 35.51g / L, and use ICP to detect the impurity content therein. The impurity content Pt is 0.35 g / L, and the Pd 0.87 g / L, Al 0.55 g / L, Fe 0.24 g / L, Ca 0.31 g / L, Mg 0.26 g / L, Cu 0.44 g / L, Ni 0.34 g / L, Si 0.15g / L.

[0016] Measure 500ml of chlororhodium acid solution and put it into a flask, add 2g of precipitant, reflux at 115°C for 24h, cool, filter to remove insoluble precipitate, add 250g of precipitant to the filtrate, heat up to 115°C, and boil the solution for reflux for 24h. Until the rhodium in the solution generates a brown precipitate; the reactant is cooled to room temperature, filtered, the rhodium precipitate is washed with ethanol and methanol, and filtered to dryness, then the obtained rhodium precipitate is dissolved in a sufficient amou...

Embodiment 2

[0018] Control the acid concentration of the rhodium leaching solution to be recovered to 6-8mol / L and carry out heating and reflux for 32h, adjust the concentration of the rhodium solution, measure the rhodium concentration to be 49.65g / L, and use ICP to detect the impurity content therein, the impurity content Pt is 0.80g / L, and the Pd 0.33g / L for Al, 0.51g / L for Al, 0.13g / L for Fe, 0.24g / L for Ca, 0.31g / L for Mg, 0.07g / L for Cu, 0.08g / L for Ni, and 0.08g / L for Si. 0.11g / L.

[0019] Measure 1000ml of chlororhodium acid solution and put it into a flask, add 4g of precipitant, reflux at 110°C for 24h, cool, filter to remove insoluble precipitate, add 600g of precipitant to the filtrate, heat up to 110°C, and boil the solution to reflux for 36h, Until the rhodium in the solution generates a brown precipitate; the reactant is cooled to room temperature, filtered, the rhodium precipitate is washed with ethanol and methanol, and filtered to dryness, then the obtained rhodium preci...

Embodiment 3

[0021] Control the acid concentration of the rhodium leaching solution to be recovered at 6-8mol / L and carry out heating and reflux for 45h, adjust the concentration of the rhodium solution, measure the rhodium concentration to be 75.58g / L, and use ICP to detect the impurity content therein. The impurity content Pt is 0.76g / L, and the Pd 0.84g / L for Al, 1.18g / L for Al, 0.52 g / L for Fe, 0.67 g / L for Ca, 0.52 g / L for Mg, 0.88 g / L for Cu, 0.64 g / L for Ni, and 0.64 g / L for Si. 0.27g / L.

[0022] Measure 800ml of chlororhodium acid solution and put it into a flask, add 5g of precipitant, reflux at 120°C for 24h, cool, filter, add 480g of precipitant to the filtrate, heat up to 120°C, and boil the solution for reflux for 42h until the Rhodium generates a brown precipitate; the reactant is cooled to room temperature, filtered, and the rhodium precipitate is washed with ethanol and methanol, and suction filtered to dryness, then the gained rhodium precipitate is dissolved in a sufficie...

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Abstract

The invention discloses a high purity rhodium recovery purification method, relates to precious metal recovery purification field, and especially relates to a method for separation and purification of rhodium from other precious metals and base metals in a rhodium-containing waste leachate. According to the method, tetramethylammonium chloride is used as a precipitant, the rhodium solution concentration is controlled to 30-80 g / L, firstly, a small amount of precipitant is added for reaction to remove platinum, iron and other high valence impurities, excessive precipitant is added into the obtained filtrate for boiling and reflux at 110-120 DEG C for 24 h-48 h to obtain a rhodium salt precipitate. High purity rhodium hydroxide is obtained by full washing, dissolving, passing through resin, and potassium hydroxide precipitation carried out on the rhodium salt precipitate. The high purity rhodium recovery purification method is strong in process applicability, simple in operation, low in cost, high in product purity, and free of emission, and may not cause environmental pollution.

Description

technical field [0001] The invention relates to the field of recovery and purification of precious metals, in particular to a method for separating and purifying rhodium and other precious metals from base metals from the leach solution of waste materials containing rhodium. Background technique [0002] The precious metal rhodium plays an important role in industrial production. 90% of rhodium in the world is mainly used as automobile exhaust catalysts, and it is also often used as hydrogenation catalysts, thermocouples, platinum-rhodium alloys, etc., and is often plated on searchlights and reflectors as a polishing agent for gemstones And electrical contact parts, and rhodium can also be used as a coating for other metals. However, the recovery and purification of rhodium is an important factor affecting its industrial application, especially its separation from other precious metals and base metals has always been a recognized problem in precious metal extraction metallu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G55/00
Inventor 曹笃盟王红梅张静郭守杰易镇芳刘国旗梁斌李欢马正明郅欢欢祁世青
Owner 兰州金川贵金属材料股份有限公司
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