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

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.

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 ...

AI Technical Summary

Problems solved by technology

However, these two technologies do not take into account the recovery or treatment of thiocyanate. At the same time, in AVR technology, copper is mainly precipitated and separated from the solution in the form of cuprous cyanide, which cannot realize the efficient recycling of cyanide; while SART technology Often in order to improve the precipitation and separation efficiency of copper, an excess of S 2- , even in some systems need to use more than twice the theoretical amount of S 2- , in order to obtain a better copper sinking effect

In addition, with the improvement of environmental awareness, the harmless treatment of thiocyanate has gradually gained attention. However, most of the research has focused on the use of strong oxidation conditions to oxidize thiocyanate to sulfate, bicarbonate and ammonium. , not only the consumption of chemicals is high or the energy consumption is high, but also the intermediate product cyanide, which has important economic benefits, is lost. Therefore, an efficient comprehensive recovery method for copper-containing sulfur-gold ore carbon leach solution is developed to realize the cyanide in the copper solution. The effective recycling and harmless treatment of gold, copper, cyanide and thiocyanate can also greatly reduce the total amount of pollution factors discharged into water bodies, protect people's physical and mental health, and contribute to the construction of a civilized, harmonious and sustainable society. Guarantee system provides technical support

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