Method for refining palladium from alkaline strip liquor

A stripping liquid, alkaline technology, applied in the field of precious metal refining, can solve the problems of long refining cycle, low yield, unfriendly environment, etc., and achieve the effect of shortening refining cycle, high dissolution efficiency, and improving environmental friendliness

Active Publication Date: 2016-12-14
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the invention is to obtain diisoamyl sulfide S from the prior art 201 Various methods of refining palladium in the palladium stripping solution produced after extracting palladium have the disadvantages of low yield, unfriendly environment, and long refining cycle. A method for refining palladium from the alkaline stripping solution is provided to make the reaction The palladium in the extract can be converted into a low-acid ammonium chloropalladate solution relatively quickly and easily while initially removing impurities, and carry out subsequent refining operations

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  • Method for refining palladium from alkaline strip liquor
  • Method for refining palladium from alkaline strip liquor
  • Method for refining palladium from alkaline strip liquor

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Embodiment 1

[0021] A method for refining palladium from alkaline stripping liquid, comprising the following steps: diisoamyl sulfide S 201 After extraction, adjust the palladium concentration to 80g / L in the alkaline ammonia-containing stripping solution produced by back-extraction with ammonia water, add ammonia water to adjust the pH=8, let stand for 4 hours, and filter out the insoluble matter. The filtrate was adjusted to pH = 1 with hydrochloric acid, filtered after standing for 3 hours, the filter residue was washed with 1% hydrochloric acid solution until the washing liquid was colorless, the filtrate was replaced with zinc powder, and the filter residue weighed 1352.5g. Slurry the washed filter residue with 6.8L of pure water for 1 hour at a solid-to-liquid ratio of 1:5, add 800ml of concentrated hydrochloric acid to it, adjust the acidity to 3mol / L, raise the temperature to 90°C under stirring, and keep the temperature for 1.5 hours The precipitate was completely dissolved, and a...

Embodiment 2

[0025] A method for refining palladium from alkaline stripping liquid, comprising the following steps: diisoamyl sulfide S 201 After extraction, adjust the concentration of palladium to 100g / L in the alkaline ammonia-containing stripping solution produced by back-extraction with ammonia water, add ammonia water to adjust the pH=10, then let it stand for 3 hours, and filter out a small amount of insoluble matter. The filtrate was adjusted to pH = 2 with hydrochloric acid, filtered after standing for 4 hours, the filter residue was washed with 5% hydrochloric acid solution until the washing liquid was colorless, the filtrate was replaced with zinc powder, and the filter residue weighed 139.35kg. Slurry the washed filter residue with 836L of pure water for 2 hours at a solid-to-liquid ratio of 1:6, add 90L of concentrated hydrochloric acid to it, adjust the acidity of the solution to 4mol / L, heat up to 100°C under stirring, and keep the temperature for 2 hours. The precipitate wa...

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Abstract

The invention discloses a novel method for refining palladium from alkaline strip liquor. The novel method comprises the following steps that (1) the concentration of the palladium in the alkaline palladium strip liquor is concentrated and adjusted; (2) preliminary purification is conducted through complexation and acidification; (3) rough trans-diamminedichloropalladium is dissolved with diluted hydrochloric acid; and (4) follow-up refining is conducted through traditional palladium sediment, water dissolution, complexation and acidification methods, and a 99.99% sponge palladium product is produced. Compared with the prior art, the novel method for refining the palladium from the alkaline strip liquor has the advantages that the yield is high, waste gas containing ammonia is not produced, conversion between the trans-diamminedichloropalladium and ammonium chloropalladite is easy and convenient, the product quality is stable, and industrialization is easy to achieve; and the palladium yield can reach 99.3% or above.

Description

technical field [0001] The invention belongs to the technical field of precious metal refining, and relates to a method for refining palladium from an alkaline stripping solution, more specifically to a method for refining palladium from diisoamyl sulfide S 201 A method for separating and refining palladium from the alkaline stripping solution produced after palladium extraction. Background technique [0002] Palladium is an expensive metal, which has a remarkable metallic luster and is favored by the jewelry industry. More importantly, palladium has unique catalytic properties for various chemical reactions. Therefore, more than 60% of palladium is used in the manufacture of automobile exhaust catalysts, petrochemical catalysts, etc. [0003] Extraction is considered to be a palladium separation and extraction process with high selectivity, low cost and considerable yield. Among many extractants, diisoamyl sulfide S 201 Because of its advantages of easy acquisition, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
CPCC22B11/04Y02P10/20
Inventor 潘从明谢振山杨丽虹王立郭晓辉李芬霞
Owner JINCHUAN GROUP LIMITED
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