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Method for separating rhodium and iridium in solution

A solution and hydrochloric acid technology, applied in the field of metallurgy, can solve the problems of long separation cycle and low separation efficiency, and achieve the effect of solving long extraction cycle, improving separation efficiency, and solving loss and waste

Active Publication Date: 2022-04-05
JINCHUAN GROUP LIMITED
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low separation efficiency and long separation cycle of rhodium and iridium in the existing technology, provide a method capable of efficiently separating rhodium and iridium in one step, shorten the extraction process of rhodium and iridium, improve extraction efficiency and reduce costs

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  • Method for separating rhodium and iridium in solution

Examples

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Embodiment 1

[0014] After the nickel smelting tailings enrichment slag chloride solution is separated from base metals and platinum palladium, the concentrations of Rh and Ir in the solution are 0.26g / L and 0.37g / L respectively, and the volume is 1000L. Add hydrochloric acid to adjust the acidity of the solution to 6mol / L L, heat up to 95°C, configure 4.16L of rhodium precipitant according to hydrochloric acid: 2-dimethylaminochloropropane = 1:1.37 (mass ratio), stir while adding rhodium precipitant, after 2.5 hours of precipitation, transfer the solution to filtration Filtrate in the tank, wash the rhodium salt with pure water at 85°C for 3 times, calcinate at 650~680°C, and reduce it with hydrogen at 650~680°C to obtain rhodium powder. After the filtrate and lotion are combined and tested, the concentration of Rh is <0.0002g / L, the concentration of Ir is 0.37g / L, calcined at 680~720°C, and reduced by hydrogen at 680~720°C to obtain the iridium powder product.

Embodiment 2

[0016] The concentrations of Rh and Ir in the rhodium-iridium concentrate chlorination solution are 6.2g / L and 10.3g / L respectively, and the volume is 200L. Add hydrochloric acid to adjust the acidity of the solution to 6.5mol / L, heat up to 90°C, and press hydrochloric acid: 2-2 Methylaminochloropropane=1:1.35 (mass ratio) configure rhodium precipitant 20.4L, after precipitation for 3 hours, after the rhodium precipitant is added, transfer the solution to the filter tank for filtration, and wash the rhodium salt with pure water at 85°C for 3 times Finally, it is calcined at 650~680°C and hydrogen reduced at 650~680°C to obtain rhodium powder. After the filtrate and lotion are combined and tested, the concentration of Rh is 0.001g / L, and the concentration of Ir is 10.3g / L. Calcination at 680~720℃, hydrogen reduction at 680~720℃, the iridium powder product is obtained.

Embodiment 3

[0018] Silver anode slime chlorination solution leaching After extracting gold, platinum and palladium, Rh and Ir concentrations in the solution are respectively 0.55g / L and 0.03g / L, and the volume is 2000L. Add hydrochloric acid to adjust the acidity of the solution to be 6.3mol / L, and heat up to 91°C, according to hydrochloric acid: 2-dimethylaminochloropropane = 1:1.38 (mass ratio), configure rhodium precipitant 16.5L, add rhodium precipitant while stirring, after precipitation for 2.5h, transfer the solution to the filter tank for filtration , Rhodium salt is washed with 85°C pure water for 3 times, calcined at 650~680°C, and hydrogenated at 650~680°C to obtain rhodium powder. After the filtrate and lotion are combined and tested, the Rh concentration is 0.0005g / L, and the Ir concentration is 0.03g / L. The iridium solution is combined with the rhodium-iridium concentrate separation liquid, calcined at 680~720°C, and hydrogen reduced at 680~720°C , to obtain iridium powder p...

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Abstract

The invention discloses a method for separating rhodium and iridium in a solution, the method adopts a mixed precipitator prepared from 2-dimethylaminochloropropane and hydrochloric acid to selectively and efficiently precipitate rhodium from the solution to obtain pure rhodium salt and iridium solution, the rhodium and iridium separation efficiency can reach 99% or above, the rhodium and iridium separation efficiency is improved, and the method is suitable for industrial production. The subsequent refining process is shortened, the comprehensive yield index of rhodium and iridium is improved, the efficient utilization of resources is guaranteed, the production cost is saved, and the problems of long rhodium and iridium extraction period and low yield are solved. The method can be applied to a high-efficiency extraction process of rhodium in a rhodium-containing solution in a precious metal hydrometallurgy process, and can also be applied to high-efficiency removal of trace rhodium in an iridium-containing solution.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for separating rhodium and iridium in a solution. Background technique [0002] In the precious metal smelting raw materials, rhodium and iridium are two valuable metal elements with similar properties and are associated with each other. During the smelting process, the separation of rhodium and iridium has become a key step in extracting metals, which directly determines the extraction efficiency of rhodium and iridium in raw materials. Cost, common rhodium-iridium separation methods include chemical precipitation and solvent extraction. Chemical precipitation has the advantages of simple operation, short production cycle, safety and environmental protection. The selectivity and precipitation efficiency of the precipitant directly determine the separation efficiency. Therefore, It is necessary to study the precipitant and related processes for the selecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/44
CPCY02P10/20
Inventor 杨万虎张燕潘从明高向乾杨晓真韩彬
Owner JINCHUAN GROUP LIMITED