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Method for extracting palladium from alkaline cyanide solution with dodecyldimethyl-2-phenoxyethyl ammonium bromide

A technology of phenoxyethylammonium bromide and dodecyldimethyl, which is applied in the field of extracting palladium, can solve the problems of low selectivity of activated carbon adsorption, difficult recycling of zinc, and low direct recovery rate, etc. The effect of cheap price, fast return on investment, and large profit space

Inactive Publication Date: 2016-06-08
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the zinc powder replacement method needs to destroy the cyanide in the solution first, the operation is more complicated, and it is difficult to return the zinc in the solution after replacement; while the activated carbon adsorption method is not selective, the process is long, and the direct recovery rate is low.
The extraction of palladium by solvent extraction has been used in production abroad in the 1980s, and it has also been industrialized in China in recent years, but the established palladium extraction system is limited to acidic media

Method used

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  • Method for extracting palladium from alkaline cyanide solution with dodecyldimethyl-2-phenoxyethyl ammonium bromide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Get the Pd(CN) whose Pd(II) concentration is 25.8mg / L 4 2- 60 mL of the solution was placed in a separatory funnel, and the pH of the solution was adjusted to 10.0 as the aqueous phase of the extraction system. The organic phase was prepared, wherein the total volume of the organic phase was 20 mL, the organic phase contained 4 mL of n-decyl alcohol, and the remainder was diluent with xylene, and the concentration of DDPB in the organic phase was 0.01 mol / L. Add the organic phase to the water phase (O / A=1:3), mechanically shake for 5 minutes and then stand for stratification. After phase separation, measure the concentration of palladium in the water phase, and obtain the concentration of palladium in the organic phase by subtraction. Take the organic phase loaded with palladium, put it into another separatory funnel, add NH with a concentration of 0.1mol / L according to the ratio of the aqueous phase to the organic phase (A / O) 1:2 4 SCN back-extraction, after 5 minute...

Embodiment 2

[0038] Get the Pd(CN) whose Pd(II) concentration is 55.6mg / L 4 2- 40 mL of the solution was placed in a separatory funnel, and the pH of the solution was adjusted to 11.5 as the aqueous phase of the extraction system. The organic phase was prepared, wherein the total volume of the organic phase was 20 mL, the organic phase contained 5 mL of n-amyl alcohol, the balance was benzene as a diluent, and the concentration of DDPB in the organic phase was 0.01 mol / L. Add the organic phase to the water phase (O / A=1:2), mechanically shake for 4 minutes and then stand for stratification. After phase separation, measure the concentration of palladium in the water phase, and obtain the concentration of palladium in the organic phase by subtraction. Take the organic phase loaded with palladium, put it into another separatory funnel, add NH with a concentration of 0.1mol / L according to the ratio of the aqueous phase to the organic phase (A / O) 1:2 4 SCN back-extraction, after 5 minutes of m...

Embodiment 3

[0040] Get the Pd(CN) whose Pd(II) concentration is 99.3mg / L 4 2- 20 mL of the solution was placed in a separatory funnel, and the pH of the solution was adjusted to 11.0 as the aqueous phase of the extraction system. Prepare the organic phase, wherein the total volume of the organic phase is 20 mL, the organic phase contains 6 mL of n-hexanol, and the balance uses n-heptane as a diluent, and the concentration of DDPB in the organic phase is 0.01 mol / L. Add the organic phase to the water phase (O / A=1:1), mechanically shake for 5 minutes and then stand for stratification. After phase separation, measure the concentration of palladium in the water phase, and obtain the concentration of palladium in the organic phase by subtraction. Take the organic phase loaded with palladium, put it into another separatory funnel, add 0.1mol / LNH according to the ratio of water phase and organic phase (A / O) 1:1 4 SCN back-extraction, after 5 minutes of mixed phases, let it stand for stratifica...

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Abstract

The invention relates to a method for extracting palladium from an alkaline aurocynide solution by using dodecyl dimethyl-2-phenoxyacetic ammonium bromide and belongs to noble metal hydrometallurgy. The method comprises the following steps: adjusting pH of [Pd(CN)4]2- slurry to 9.5-11.5 as an aqueous phase of an extraction system; by using dodecyl dimethyl-2-phenoxyacetic ammonium bromide (DDPB for short) as an extraction agent, one of n-amyl alcohol, hexyl alcohol, n-heptanol, n-octyl alcohol or n-decyl alcohol as a synergist and one of benzene or xylene or n-heptane or sulfonated kerosene as a diluent, mixing phases and standing to layer as the concentration of DDPB in an organic phase is 0.01-0.03mol / L; transferring [Pd(CN)4]<2-> from the aqueous phase to the organic phase, and reversely extracting palladium from a 0.1-0.3mol / LNH3SCN liquid; and the like. The solvent provided by the invention is saturated in extraction system and high in extraction capacity, easy to reversely extract, short in extraction period and low in cost, and has promotional and application prospects.

Description

technical field [0001] The invention belongs to precious metal hydrometallurgy, in particular to a process for extracting palladium from alkaline cyanide solution. Background technique [0002] For the metallurgical process of extracting platinum group metals from flotation concentrates, the fire process of matte-making smelting and capturing precious metals is adopted at home and abroad. The process of precious metal refining process is complicated and the recovery index of precious metals is low. In 2001, as one of the inventors Academician Chen Jing proposed a new full-wet method to directly carry out oxygen pressure acid leaching of Jinbaoshan flotation concentrate. >99% of Cu, Ni and Co in the solution are transferred into the solution in the form of sulfate, and most of Fe is hydrolyzed into hematite Fe in the process 2 o 3 and goethite FeO(OH) into the slag; the oxygen pressure acid leaching slag with a slag rate of 50% is subjected to two-stage pressurized cyani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B11/00
CPCY02P10/20
Inventor 黄章杰陈景陈蕾刘珉宏
Owner YUNNAN UNIV
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