Rhodium reduction activation dissolution method

A technology of rhodium waste and technical solutions, which is applied in the field of rhodium dissolution and can solve problems such as slow dissolution speed

Active Publication Date: 2014-07-02
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of the electrochemical dissolution method is that no new impurities are introduced during the dissolution process, and the electrolyte can directly enter the subsequent refining process. The disadvantage is that the dissolution rate is slow

Method used

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  • Rhodium reduction activation dissolution method

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Experimental program
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Effect test

Embodiment 1

[0024] A, rhodium waste crushing and grinding: 100 grams of waste platinum catalytic network aqua regia insoluble residue, rhodium content is 82.23%, rhodium 82.23 grams, crushing and grinding with disc crusher, cross 300 mesh sieves.

[0025] B, mix with activator: the rhodium waste material after the crushing that step A makes is fully mixed with 300 grams of 200 mesh zinc powders.

[0026] C. Acid dissolution activation: In a closed 2L glass reactor, first add 800ml of industrial hydrochloric acid, the concentration of hydrochloric acid is 10mol / L, add the mixture while stirring, the stirring speed is 120 rpm, and the reaction rises to 95°C. Keep warm for 60 minutes.

[0027] D. Filtration: filter the solution after the reaction in step C to obtain a filter residue, wash the filter residue 8 times with hot water at 75° C. for 3 times to obtain a reduced and activated rhodium material.

[0028] E. Dissolution: Put the reduced and activated rhodium material obtained in step ...

Embodiment 2

[0030] A, rhodium waste crushing and grinding: 100 grams of organic rhodium waste slag, rhodium content is 18.67%, containing rhodium 18.67 grams, crushing and grinding with disc crusher, cross 280 mesh sieves.

[0031] B, mix with activator: the rhodium waste material after the crushing that step A makes is fully mixed with 200 grams of 250 mesh zinc powders.

[0032]C. Acid dissolution activation: In a closed 2L glass reactor, first add 500ml of industrial hydrochloric acid, the concentration of hydrochloric acid is 12mol / L, add the mixture while stirring, the stirring speed is 80 rpm, and the reaction rises to 60°C. Keep warm for 80 minutes.

[0033] D. Filtration: Filter the solution after the step C reaction is completed to obtain a filter residue, which is washed twice with hot water at 85°C 12 times the filter residue to obtain a reduced and activated rhodium material.

[0034] E. Dissolution: Put the reductively activated rhodium material obtained in step D into a gla...

Embodiment 3

[0036] A, rhodium waste crushing and grinding: coarse rhodium powder 100 grams, content 98.10%, containing 98.1 grams of rhodium, crushing and grinding with disc crusher, cross 200 mesh sieves.

[0037] B, mix with activator: the rhodium waste material after the crushing that step A makes is fully mixed with 500 grams of 300 mesh zinc powders.

[0038] C. Acid dissolution activation: In a closed 3L glass reactor, first add 1000ml of industrial hydrochloric acid, the concentration of hydrochloric acid is 11mol / L, add the mixture while stirring, the stirring speed is 80 rpm, and the reaction rises to 80°C. Keep warm for 40 minutes.

[0039] D. Filtration: filter the solution after the reaction in step C to obtain a filter residue, and wash the filter residue once with hot water at 80°C 10 times of the filter residue to obtain a reduced and activated rhodium material.

[0040] E. Dissolution: Put the reductively activated rhodium material obtained in step D into a glass reactor,...

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Abstract

The invention discloses a rhodium reduction activation dissolution method and relates to the technical field of precious metal metallurgy. The purpose of overcoming the deficiencies of the prior art is to achieve a rhodium dissolution method with high dissolution efficiency, wet normal pressure dissolution, simple operation, short process flow, low production cost and wide range of dissolving rhodium waste. The technical scheme is: A, rhodium waste crushed and ground; B, mixed with an activator; C, acid-soluble activated; D, filtered; E, dissolved. Beneficial effects: due to the chemical reaction between the zinc powder and the hydrochloric acid solution in step C, H2 is generated. At 60-100°C, H2 can reduce the rhodium oxide in the solution to metal rhodium, and the dissolving activity of rhodium will not decrease, but will increase , which is very beneficial to the subsequent dissolution. During the activation process, rhodium oxide is reduced to metal rhodium, which is not dissolved by hydrochloric acid. Therefore, the present invention has the advantages of high dissolving efficiency of rhodium, low dissolving temperature for dissolving rhodium under normal pressure, simple operation, short technological process, low production cost and wide range of dissolving rhodium waste.

Description

technical field [0001] The invention relates to the technical field of precious metal metallurgy, in particular to a method for dissolving rhodium. Background technique [0002] Platinum group metals have high melting point, high strength, stable electric heating, high resistance to spark erosion, excellent corrosion resistance, strong high temperature oxidation resistance, and good catalytic activity. They are widely used in automobile exhaust purification, chemical industry, aerospace, glass fiber In the fields of industry, electronics and electrical industries, although the dosage is small, it plays a key role and is known as "industrial vitamin". Among the six platinum group elements, the price of rhodium was the most expensive, reaching 2.5 million yuan / kg, and the price fluctuated greatly. The chemical properties of rhodium in the solution are very complicated. During the refining process, it is usually recovered at the end, so the production cycle is relatively short....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 吴喜龙贺小塘韩守礼郭俊梅谭文进王欢李勇刘文李子璇赵雨李红梅缪海才
Owner GUIYAN RESOURCE YIMEN
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