A kind of gold mine cyanogen-containing tailings slag processing method

Abstract

The invention discloses a method used for processing gold mine cyanide-bearing tailing slag. The method comprises four steps including closed-circuit slurry mixing and processing, coprecipitation pretreatment, neutralization secondary precipitation treatment, and hydrogen peroxide catalytic oxidation, wherein the cyanide-bearing tailing slag is prepared into a slurry with a slurry mixing liquid at a certain liquid-solid ratio; an M agent is added into the slurry so as to release and remove cyanides and iron-cyanide complex compounds; a pH value neutralizer is added so as to adjust pH value to 8.5 to 9.5; a deep oxidation agent and a catalyst are added into obtained waste water so as to remove left pollutants such as cyanides and heavy metals. Closed-circuit slurry mixing and processing, coprecipitation pretreatment, neutralization and arsenic removing, and hydrogen peroxide catalytic oxidation are combined for advanced treatment of gold mine cyanide-bearing tailing slag based on characteristics of gold mine cyanide-containing waste water that pollutants are complex, and processing is difficult to realize; processing effect is excellent; processing efficiency is high; system operation is stable; technology process is simple; and it is convenient for realizing of industrial application.

Description

technical field

[0001] The invention relates to a method for treating pollutants in the field of environmental protection, in particular to a method for treating cyanide-containing tailings in gold mines. Background technique

[0002] At present, 80% of the world's gold production is obtained by cyanidation gold extraction technology, and tailings slag is the main solid waste of gold mine cyanide leaching process. Due to the needs of the stable development of my country's national economy, the development scope of gold resources has rapidly shifted from the simple and easy-to-handle resources to the refractory gold resources containing arsenic, sulfur, and complex metals. After metals such as gold, silver, copper or molybdenum are extracted through the beneficiation process, many tailings slags containing arsenic, sulfur and other heavy metal pollutants are identified as hazardous wastes through toxic leaching. If the tailings slag is directly stacked in the tailings pond, ...