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Method for extracting rhodium from alkaline cyanide solution with 1-vinyl-3-isoamylimidazolium bromide

A technology of isopentylimidazolium bromide and vinyl, which is applied in the field of rhodium extraction, and can solve problems such as difficult elution, long cycle time, and complicated treatment process

Active Publication Date: 2021-04-27
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The extraction of rhodium in alkaline cyanide solution medium mainly adopts base metal replacement method and adsorption separation method at present, and the post-treatment process of base metal replacement method is relatively complicated, and the operation is cumbersome, and the direct recovery rate is low, the cycle is long, and the cost is high; while the adsorption separation method is due to The adsorption capacity is small, the elution is difficult, and the large-scale application is restricted
At present, the use of solvent extraction to extract rhodium in alkaline cyanide solution medium is still in the experimental and exploration stage at home and abroad, and there is no literature report on the mature extraction system so far. To study the extraction behavior of rhodium in alkaline cyanide solution medium, establish an efficient extraction system to realize the large-scale extraction of rhodium from alkaline cyanide solution is an important problem that needs to be solved urgently in current platinum group metallurgy

Method used

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  • Method for extracting rhodium from alkaline cyanide solution with 1-vinyl-3-isoamylimidazolium bromide
  • Method for extracting rhodium from alkaline cyanide solution with 1-vinyl-3-isoamylimidazolium bromide
  • Method for extracting rhodium from alkaline cyanide solution with 1-vinyl-3-isoamylimidazolium bromide

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Experimental program
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Effect test

Embodiment 1

[0023] At room temperature, fix the [Rh(CN) 6 ] 3- The initial concentration was 103.2 mg / L, the concentration of VIMB in the organic phase was 0.06 mol / L, the ratio (O / A) of the organic phase and the aqueous phase was 1:1, mechanically shaken for 5 minutes and then allowed to stand for stratification. The kerosene is used as the diluent of the extraction system, TBP is used as the co-extracting agent, and the organic phase contains 20% TPB (V TPB / V 有机相 ), the total volume of the organic phase was 20 mL, and Rh(CN) was extracted from VIMB at different pH values. 6 3- The effect of performance is shown in Table 1.

[0024] Table 1. pH vs. VIMB extraction of Rh(CN) 6 3- performance impact

[0025]

Embodiment 2

[0027] At room temperature, the pH value of the solution was controlled to be 10.0, the ratio of the organic phase to the aqueous phase (O / A) was 1:1, the extraction time was 5 minutes, and the Rh(CN) in the solution to be extracted was fixed. 6 3- The initial concentration is 103.2mg / L, sulfonated kerosene is selected as the diluent of the extraction system, TBP is used as the co-extracting agent, and the organic phase contains 20% TBP (V TPB / V 有机相 ), the total volume of the organic phase was 20 mL, and the continuous extraction method was used to determine the extraction of Rh(CN) with different concentrations of VIMB solution. 6 3- Saturated extraction capacity. Extraction of Rh(CN) by VIMB Solution with Different Concentrations 6 3- The saturated extraction capacity is shown in Table 2:

[0028] Table 2. Saturated extraction capacity of Rh(III) extracted by VIMB solution with different concentrations

[0029]

[0030] The experimental results show that VIMB can ...

Embodiment 3

[0032] Take Rh(CN) whose Rh(III) concentration is 58.7mg / L 6 3- 60 mL of the solution was placed in a separatory funnel, and the pH value of the solution was adjusted to 9.0 as the aqueous phase of the extraction system. The organic phase was prepared, wherein the total volume of the organic phase was 60 mL, the organic phase contained 6 mL of TBP, the remainder was sulfonated kerosene as a diluent, and the concentration of VIMB in the organic phase was 0.02 mol / L. According to the ratio (O / A) 1:1, mechanically shake for 2 minutes and then stand for stratification. After phase separation, measure the concentration of rhodium in the aqueous phase, and obtain the concentration of rhodium in the organic phase by subtraction. Take the organic phase loaded with rhodium, put it into another separatory funnel and add a KBr solution with a concentration of 0.05mol / L in a ratio (O / A) of 1:1 to carry out back extraction, mix the phases for 3 minutes and let stand for stratification. A...

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Abstract

The method for extracting rhodium from alkaline cyanide solution with 1-vinyl-3-isoamylimidazolium bromide belongs to noble metal hydrometallurgy. Extraction involves adjusting [Rh(CN) 6 ] 3‑ The pH of the feed solution is 9.0-11.0 as the water phase of the extraction system; 1-vinyl-3-isoamylimidazolium bromide (VIMB for short) is used as the extractant, tributyl phosphate as the co-extractant, and sulfonated kerosene as the Diluent, prepare an organic phase composed of extractant, co-extractant, and diluent. The concentration of VIMB in the organic phase is 0.02-0.10mol / L. 6 ] 3‑ Transfer from the water phase to the organic phase, and back-extract the rhodium in the organic phase with 0.05-0.15mol / L KBr solution. The solvent extraction system of the present invention has good extraction performance for rhodium in the alkaline cyanide solution medium, easy stripping, short extraction cycle, simple process conditions, easy operation, the extraction rate of rhodium is greater than 98.0%, and the stripping rate of rhodium can reach Above 97.0%.

Description

technical field [0001] The invention belongs to precious metal hydrometallurgy, and particularly relates to a process for extracting rhodium from alkaline cyanide solution. Background technique [0002] The precious metal rhodium plays an important role in industrial production. In addition to being used as a catalyst for automobile exhaust, rhodium is also widely used in hydrogenation catalysts, thermocouples, coatings and gemstone polishing agents. Rhodium is mainly derived from platinum group metal mines. Resource mining and recovery of metallurgical secondary resources, leaching platinum group metal flotation concentrates or rhodium in secondary resources, usually two wet processes of chlorination and pressurized cyanidation are used to obtain acidic chlorinated liquid medium and alkali respectively. Natural cyanide medium leaching solution, precipitation method, solvent extraction method, activated carbon adsorption method and ion exchange method are the refining and ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/08C22B3/40
CPCC22B11/08C22B3/409Y02P10/20
Inventor 黄章杰金次邵敏叶群蒋绍松迟学治吴胜杰
Owner YUNNAN UNIV
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