Environmental-protection gold leaching agent and preparation method thereof

Abstract

The invention relates to the technical field of gold extraction, and particularly relates to an environmental-protection gold leaching agent and a preparation method thereof; the gold leaching agent is composed of the following raw materials in parts by weight: 8-15 parts of a strong alkali, 4-16 parts of carbonate, 12-30 parts of sodium cyanate, 3-6 parts of sodium chloride, 2-8 parts of sodium bromide, 6-22 parts of an iron salt, 2-4 parts of an oxidant, and 3-6 parts of a stabilizer. The gold leaching agent can completely replace cyanide for gold leaching, and is non-toxic and harmless; moreover, the synthesis process is simple, the utilization rate of the raw materials is higher, the waste gas emission load is low, and waste gas has no influence on the environment after being absorbed by a spray tower; the oxidant and the stabilizer are added in the product, so the product is guaranteed to have better gold leaching performance, can handle primary ores, oxidized ores and ores with more harmful impurities, and has wider adaptability.

Description

technical field [0001] The invention relates to the technical field of gold extraction, in particular to an environment-friendly gold leaching agent and a preparation method thereof. Background technique [0002] The cyanide gold extraction process has the characteristics of simple and easy operation, strong adaptability, high leaching rate, and stable production process. At present, 70% of domestic and foreign gold production is produced by cyanidation. However, sodium cyanide is a highly toxic agent, which is extremely harmful to the environment, and the cost of production management is very high. [0003] In recent years, with the continuous improvement of global environmental awareness and the improvement of environmental protection systems, more and more attention has been paid to the environmental protection of mines. At the 2007 China International Mining Conference, the Ministry of Land and Resources officially proposed the goal of developing green mining. , requir...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of highly toxic cyanide pollution, for decades, relevant scholars at home and abroad have carried out a large number of experimental research work, trying to find cyanide-free and non-toxic mineral dressing agents. There are dozens of gold leaching agents that have been studied, such as : Sulfuric acid method, thiosulfate method, lime sulfur mixture method, chlorination method, bromination method, nitric acid pre-oxidation method etc., in these methods, the main problem that restricts the industrial production of cyanide-free gold leaching process is production cost High, more complex process

For example, in the thiourea method, the consumption of thiourea is too large, the cost is high, and it needs to be used under acidic conditions, which is easy to cause corrosion to the equipment

The thiosulfate method needs to be carried out under heating conditions, which is sensitive to the influence of temperature, and the process department is easy to control. Moreover, the amount of reagents used in this method is relatively large, and the regeneration and utilization of reagents must be strengthened.

Lime-sulfur mixture method has superior gold leaching performance, but this method is still very immature in technology and cannot handle many refractory gold ores, so further research is needed

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