Method for enriching and preparing pure gold from antimony-gold alloy through potential control

Abstract

Provided is a method for enriching and preparing pure gold from an antimony-gold alloy through potential control. The method for enriching and preparing the pure gold from the antimony-gold alloy through potential control comprises the following steps that after the antimony-gold alloy is crushed and levigated to a required particle size, hydrogen peroxide is added into a pure hydrochloric acid system to conduct potential controlling and oxidizing leaching, slurry after being leached is added into copper powder to conduct potential controlling and displacing, raw gold powder is obtained after displacement residue is soaked and digested in concentrated sulfuric acid, the hydrogen peroxide is added into a hydrochloric acid solution containing the raw gold powder to conduct potential controlling and gold leaching by chlorination, gold leaching liquid is added into sodium hydroxide and sodium sulfite to conduct potential controlling and reduction, and gold powder is obtained, and pure gold powder is obtained after the gold powder is washed. According to the method for enriching and preparing the pure gold from the antimony-gold alloy through potential control, a potential control mode is adopted to achieve the purpose that the processes of oxidation leaching, displacement, gold leaching by chlorination, reduction and the like are adjustable and controllable, and the direct recovery rates of gold and silver reach to over 99.9% and 99.0% correspondingly. The method has the advantages of being good in metal separation effect, stable in technical index, short in technological process and the like.

Description

technical field [0001] The invention relates to a precious metal extraction metallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for enriching rich antimony and preparing Sijiu gold by effectively adopting a potential control method. Background technique [0002] Gold is a rare strategic metal widely used in gold jewelry, currency reserves and high-tech industries. According to U.S. Geological Survey data, the world's identified gold resources are 89,000 tons, of which about 1 / 3 of the gold resources are refractory ores. In 2015, the global gold output was 3,211 tons, accounting for more than 1 / 3 of the gold output. Produced from refractory gold mines, the proportion is still increasing with the increasing consumption of high-quality resources. [0003] Geochemical studies have shown (①Nie Shuren, Suo Yourui. Gold leaching from refractory metallurgical ores [M]. Beijing: Geological Press, 1997), in the process of endogeno...

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Problems solved by technology

[0008] Although the potential-controlled chlorination leaching process effectively improves the metal recovery rate, the silver dispersion phenomenon is serious and the recovery rate is low in the process of the treatment process, and the silver is dispersed in the leaching residue, lead chloride and hydrolysis residue. The content of base metal impurities in chemical leaching slag is high, and a series of processes such as pyromelting, bead splashing, aqua regia gold dissolution, gold extraction and reduction stripping are required to produce 49 gold, which has long process, large investment and environmental impact. Pollution risks and safety hazards are serious, but disadvantages

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