Method for recycling gold and silver from high-arsenic gold concentrate

Abstract

The invention relates to a method for recycling gold and silver from high-arsenic gold concentrate and relates to the field of gold concentrate smelting. The method comprises the following steps: feeding high-arsenic gold concentrate in a two-section fluidized bed roaster for desulfuration and dearsenification; adding certain amount of sulfuric acid in roasted slag to remove copper, and opening part of ferric oxide parcels; enabling acid leaching slag to enter a following leaching system after solid-liquid separation, and adding lime in acid leaching solution, controlling pH value to produce multi-metal arsenious slag and iron-containing gypsum slag, returning to the acid leaching procedure; in the leaching procedure, adopting the normal temperature and normal pressure chlorination processgold extracting technology to rapidly extract gold and silver; after being adsorbed by active silica, enabling the leaching solution to enter a smelting workshop to generate finished product of silver and gold; after extracting gold and silver, adopting the chemical method to remove impurities from the leaching solution, recovering activity through diaphragm electrodeposition, and returning to leach. According to the method, the gold and silver recovery rate is high, the output quantity of hazardous wastes is small, the method takes the wet process as the principal thing, and energy consumption is less.

Description

technical field [0001] The invention relates to the field of gold concentrate smelting, in particular to a method for recovering gold and silver in high-arsenic gold concentrate. Background technique [0002] High-arsenic gold concentrate belongs to a complex gold concentrate that is difficult to smelt. This type of gold concentrate is characterized by high arsenic, and gold and silver are mainly wrapped by arsenic pyrite. Conventional two-stage roasting pretreatment cyanide gold extraction process, part of the gold is not high recovery rate due to iron oxide wrapping, and the production process produces a large amount of cyanide tailings and arsenic-containing gypsum slag hazardous waste, which is not in line with the current national environmental protection policy; If the pyrometallurgical copper smelting process is used, the recovery rate of gold and silver is high, but a large amount of copper-containing materials is required for ore blending, and the arsenic content af...

AI Technical Summary

Problems solved by technology

[0002] High-arsenic gold concentrate belongs to a complex gold concentrate that is difficult to smelt. This type of gold concentrate is characterized by high arsenic, and gold and silver are mainly wrapped by arsenic pyrite. Conventional two-stage roasting pretreatment cyanide gold extraction process, part of the gold is not high recovery rate due to iron oxide wrapping, and the production process produces a large amount of cyanide tailings and arsenic-containing gypsum slag hazardous waste, which is not in line with the current national environmental protection policy; If the pyrometallurgical copper smelting process is used, the recovery rate of gold and silver is high, but a large amount of copper-containing materials is required for ore blending, and the arsenic content after blending has strict requirements. Once the arsenic exceeds the standard, it will seriously affect the quality of copper products and will A large amount of hazardous waste containing arsenic is produced, which is difficult to treat

At present, the conventional method of processing high-arsenic gold concentrate can only enter the pyrometallurgy copper smelting system through the two-stage roasting cyanidation process or a small amount of blending, which not only costs a lot, but also takes a long time period, and the process is complicated and labor-intensive.

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