Comprehensive utilization method for acid waste liquid containing arsenic

Abstract

The invention relates to a comprehensive utilization method of arsenious acid waste liquid, which utilizes waste liquid produced during the technical gold production in the treatment of the arsenious aurine mine by a bacterial oxidation technology as the raw material, and has the procedures that the waste liquid is reduced by reducing agent and the pH value range of the waste liquid is more than 2.5 and less than 7 through being adjusted by adding water, so as to realize the separation of FeAsO4, the FeAsO4 filter residue and the FeAsO4 filter liquid are obtained after being filtered. The FeAsO4 filter liquid is concentrated, crystallized, separated, and dried to obtain the green copperas product. The FeAsO4 filter residue is panned, dried, dehydrated, and crushed to obtain the ferric arsenate product. The ferric arsenate product is roasted for 1-2 h, the roasting temperature is 700-1200 DEG C, the flue gas generated by the roasting is cooled and collected to obtain the arsenic trioxide product, and the roasting residue is collected to obtain the ferric oxide product. The process of the invention is simple, and the comprehensive utilization of the waste liquid is realized by less investment, so the effects of energy conservation and carbon emission reduction as well as source scientific utilization are achieved.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of industrial waste water, in particular to a method for comprehensive utilization of arsenic-containing acid waste water produced in the process of producing gold by using a bacterial oxidation process to treat arsenic-containing gold concentrate technology. Background technique [0002] As the trivalent arsenic ions of arsenic and its compounds are easy to combine with the sulfhydryl group of the enzyme system in human cells, it will cause cell metabolism disorders, nutritional disorders, and serious damage to human health. It has been identified as the first type of carcinogen by the International Anti-Cancer Research Institute . Therefore, my country has listed arsenic and its compounds as priority pollutants. In recent years, with the popularization of the technology of treating arsenic-containing gold concentrate by bacterial oxidation process in my country, many domestic enterprise...

AI Technical Summary

Problems solved by technology

Disposal of arsenic-containing acidic wastewater by lime neutralization method has the following defects: firstly, the lime resources to be consumed in the disposal process will generate a large amount of hazardous waste; land resources; third, a large number of dangerous wastes are piled up in a centralized manner, which has potential pollution to the environment; fourth, useful substances contained in waste liquid are disposed together, resulting in waste of resources

[0004] The patent with application number 200710011170.X discloses a method for recovering valuable elements from acidic arsenic-containing biological oxidation gold extraction waste liquid, which can recover arsenic, iron, and sulfur elements in waste liquid, and harmlessly dispose of acidic arsenic-containing Arsenic waste liquid, but the process is complicated, the investment is large, and the disposal cost is high