A method for comprehensive recovery of copper-containing sulfur-gold ore charcoal leach barren solution resources

A technology of gold ore and carbon, applied in the direction of metal cyanide, improvement of process efficiency, simple alkali metal cyanide, etc., can solve the problems of thiocyanate recovery or treatment, inability to realize efficient cyanide recovery, chemical consumption, etc. It can shorten the separation and purification process, inhibit the oxidation process of cyanide, and improve the recovery rate of cyanide.

CN112226622BActive Publication Date: 2021-11-02ZIJIN MINING GROUP +1

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: ZIJIN MINING GROUP
Publication Date: 2021-11-02

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Abstract

The invention discloses a method for comprehensive recovery of copper-containing sulfur-gold ore charcoal leaching solution resources. Firstly, the copper-cyanide complex in the carbon leaching solution is converted into copper thiocyanate by acidification to precipitate and recover copper, and the copper is fully released. Cyanide, in order to facilitate the recovery of hydrocyanic acid by blowing off; then selectively convert thiocyanate into cyanide by electrocatalytic oxidation, and at the same time, use the air to separate the cyanide from the solution in the form of hydrocyanic acid in time, Avoid further oxidation of cyanide; then adjust the pH of the solution to 6-9; finally recover gold, copper, cyanide, thiocyanate, etc. remaining in the water through activated carbon adsorption to realize resource recovery and further purification; The iron slag is reused as the iron salt for electrocatalytic oxidation, realizing recycling and reducing the amount of by-product slag. The method of the invention has a high comprehensive recovery rate of resources, and the treated aqueous solution has a low concentration of pollution factors, which can meet discharge standards or be directly reused.

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Description

technical field

[0001] The invention relates to the technical field of environmental protection and comprehensive utilization of resources, in particular to a step-by-step comprehensive recovery of gold, copper, cyanide and thiocyanate from a copper-sulfur-gold ore charcoal leach solution and a method for harmless treatment. Background technique

[0002] With the depletion of easily smelted ore resources, the development and utilization of refractory resources have gradually increased. Copper-sulfur-gold ore is a common refractory gold ore. During the cyanidation process, the ore contains Copper minerals are easy to react with the gold extraction agent sodium cyanide to form copper-cyanide complex, which not only consumes the gold extraction agent sodium cyanide, but also produces copper-cyanide complex and gold-cyanide complex during the adsorption process of activated carbon. Competitive adsorption occurs in the activated carbon, which reduces the gold loading capacity of ...

Claims

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