Method for high-efficiently enriching gold and platinum metal from complex low-grade chlorine soaked slag

Abstract

A method for high-efficiently enriching gold and platinum metal from complex low-grade chlorine soaked slag relates to the key technology development field of high-efficient processing of low-grade assisted mineral resource and separation and extraction of scarce and precious metal. Complex low-grade chlorine soaked slag is subjected to the processes of slurry washing, first-stage normal-pressure leaching desulfurating, second-stage normal-pressure leaching desulfurating, pressure leaching, silicon-removing, and solid-liquid separating, while controlling appropriate technology parameters such as solid-liquid ratio, leaching reaction temperature, leaching time, acidity, addition amount of desulfurizer at the same time. Finally the silicon removed slag is high-grade, high-qualified precious metal concentrate. Compared to conventional methods, the method for high-efficiently enriching gold and platinum metal from complex low-grade chlorine soaked slag has the advantages of simple technology, environmental-friendliness, no generation of toxic waste gas or waste slag during production process, no use of toxic reagents, and high recovery rate and enrichment ratio of precious metals such as gold and palladium. The grade of enriched precious metals reaches 9000 to 15000 g / t, the recovery rate of precious metals reaches 98% or more, which is convenient for connecting the separation and refine processes of precious metals.

Description

technical field [0001] A method for efficiently enriching gold and platinum group metals from complex low-grade chlorine leaching slag, which belongs to the field of rare and precious metal hydrometallurgy, that is, belongs to the resource cycle in the energy-saving and environmental protection industry of the "Twelfth Five-Year Plan" national strategic emerging industry development plan Utilizing new technologies for the comprehensive utilization of industrial solid waste - high-efficiency dressing and smelting of low-grade co-occurring mineral resources - the key technology development field of separation and extraction of rare and precious metals, involving a full hydrometallurgy, preparation of high-grade and high-quality precious metal concentrates and comprehensive utilization of sulfur method of the element. Background technique [0002] In the metallurgical process of extracting nickel and cobalt containing rare precious metals, especially copper-nickel sulfide ore, ...

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Problems solved by technology

These methods have the disadvantages of poor desulfurization effect, use of toxic reagents, easy to cause environmental pollution, and difficulties in reprocessing desulfurization slag, requiring pyrometallurgical treatment again, resulting in dispersion and loss of precious metals, and high processing costs

Therefore, the treatment of chlorine gas leaching slag has always been a difficult problem. Since there is no suitable treatment method, chlorine gas leaching slag has been stockpiled for treatment. At present, the stockpiled amount has reached more than 15,000 tons, and it is still increasing at a rate of 5,000-6,000 tons per year. Cause the flying and loss of precious metals and elemental sulfur and environmental pollution, it is urgent to study economical, efficient and environmentally friendly chlorine gas leaching slag treatment process

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