Method for separating and purifying rhodium in high-iron rhodium-containing feed liquid

A purification method and material liquid technology, which is applied in the field of comprehensive utilization of resources, can solve the problems of high cost and low recovery rate, and achieve the effects of avoiding losses, improving direct recovery rate, and shortening the purification process

Active Publication Date: 2021-12-24
GEM CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low recovery rate and high cost in separating rhodium from high-concentration iron ion feed solution in the prior art, the present invention provides a high recovery rate and low-cost method for separating and purifying rhodium in high-iron rhodium-containing feed solution

Method used

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  • Method for separating and purifying rhodium in high-iron rhodium-containing feed liquid
  • Method for separating and purifying rhodium in high-iron rhodium-containing feed liquid
  • Method for separating and purifying rhodium in high-iron rhodium-containing feed liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composition of a certain feed liquid is as shown in Table 1:

[0035] Table 1 Chemical composition of a feed liquid

[0036]

[0037] (1) Adopting continuous hydrolysis method, high-iron rhodium-containing material liquid and liquid caustic soda are simultaneously added in the reactor, the pH of the material in the control reactor is 3.5, the temperature in the control reactor is 60°C, and the stirring speed in the reactor is 200rpm After the high-iron rhodium-containing material liquid is all added to the reactor, continue to add liquid alkali to adjust the pH to 8 in the reactor, and maintain the pH in the reactor to be 8 to 1h. After the reaction is completed, the material in the reactor is filtered. At this time, the rhodium , iron and other base metal ions all form hydroxide precipitates, obtain the first filter cake 1 and hydrolyzate after filtration, platinum, palladium, rhodium, iron content are all at 0.1ppm in the hydrolyzate, platinum palladium rhodium...

Embodiment 2

[0046] The composition of a certain feed liquid is as shown in Table 2:

[0047] Table 2 Chemical Composition of a Feed Liquid

[0048]

[0049] (1) Adopting continuous hydrolysis method, high-iron rhodium-containing material liquid and liquid caustic soda are simultaneously added in the reactor, the pH of the material in the control reactor is 3.7, the temperature in the control reactor is 70°C, and the stirring speed in the reactor is 300rpm After the high-iron rhodium-containing material liquid is all added to the reactor, continue to add liquid alkali to adjust the pH to 8.2 in the reactor, maintain the pH in the reactor to be 8.2 to 1.2h, and filter the material in the reactor after the reaction is completed. Rhodium, iron and other base metal ions all form hydroxide precipitates, and after filtration, the first filter cake 1 and hydrolyzate are obtained. The content of platinum, palladium, rhodium and iron in the hydrolyzate is all below 0.1 mg / L, and completely preci...

Embodiment 3

[0058] The composition of a certain feed liquid is as shown in Table 3:

[0059] Table 3 chemical composition of a feed liquid

[0060]

[0061] (1) Adopt continuous hydrolysis method, add high-iron rhodium-containing material liquid and liquid caustic soda simultaneously in the reactor, control the pH of the material in the reactor to be 4.0, control the temperature in the reactor to be 80°C, and the stirring speed in the reactor to be 400rpm After the high-iron rhodium-containing material liquid is all added to the reactor, continue to add liquid alkali to adjust the pH to 8.5 in the reactor, maintain the pH in the reactor to be 8.5 to 1.5h, and filter the material in the reactor after the reaction is completed. Rhodium, iron and other base metal ions all form hydroxide precipitates, and after filtration, the first filter cake 1 and hydrolyzate are obtained. The content of platinum, palladium, rhodium and iron in the hydrolyzate is all below 0.1 mg / L, and completely preci...

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Abstract

The invention discloses a method for separating and purifying rhodium in high-iron rhodium-containing feed liquid. The method comprises the following steps of simultaneously adding the high-iron rhodium-containing feed liquid and liquid caustic soda into a reaction kettle, continuously adding the liquid caustic soda to adjust the pH value in the reaction kettle to 8 to 9 after the high-iron rhodium-containing feed liquid is completely added into the reaction kettle, maintaining the pH value in the reaction kettle until no precipitate is generated, and filtering to obtain a first filter cake; stirring and washing the first filter cake with a washing solution with the pH value of 8 to 9, and filtering to obtain a second filter cake; drying the second filter cake, ball-milling, reducing in a hydrogen atmosphere, and separating and filtering in an acid leaching manner to obtain a crude rhodium product; dissolving the crude rhodium product with aqua regia, adding tetraethylenepentamine for rhodium precipitation, and filtering to obtain rhodium salt; dissolving the rhodium salt with aqua regia again, repeating rhodium precipitation-aqua regia dissolution operation for 2 to 3 times, and obtaining high-purity rhodium salt; and roasting the high-purity rhodium salt, and reducing in a hydrogen atmosphere to obtain rhodium powder with the purity of 99 percent or above. The method for separating and purifying the rhodium in the high-iron rhodium-containing feed liquid provided by the invention is high in recovery rate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources, and in particular relates to a method for separating and purifying rhodium in a high-iron rhodium-containing feed solution. Background technique [0002] The separation of rhodium from the feed solution containing high concentration of iron ions has the problems of low rhodium recovery rate, long process and high cost. There are usually two types of separation methods for rhodium in the solution. One is to separate impurity metals by means of ion exchange, extraction, and hydrolysis to obtain high-purity rhodium feed liquid for impurities in the feed liquid; The rhodium is directly reduced by selective rhodium sinking agent, amine organic matter or active metal. However, for the high-iron rhodium-containing feed liquid, due to the high concentration of impurity metal ions in the rhodium-containing feed liquid, the above-mentioned conventional separation methods hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B11/02C22B7/00C22B1/02B22F9/22
CPCC22B11/021C22B11/042C22B7/002C22B1/02C22B7/007B22F9/22Y02P10/20
Inventor 许开华肖力李琴香张坤华文超
Owner GEM CO LTD
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