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

A treatment method and tailings slag technology, which is applied in the field of treatment of cyanide-containing tailings slag in gold mines, can solve problems such as lack, and achieve the effects of high processing efficiency, simple process flow, and stable system operation

Active Publication Date: 2017-03-01
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of ideal methods for the treatment of cyanide-containing tailings. If this problem can be solved, it will be of great significance to the development of my country's gold production enterprises and environmental protection.

Method used

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Examples

Experimental program
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Effect test

specific example 1

[0027] The cyanide-containing tailings slurry of a gold mine was filtered by a plate and frame filter press, and the moisture content of the cyanide-containing tailings slag was 35%. The tailings slag was leached with toxicity, and the pH of the pollutants in the leachate exceeded the standard. 12.01, CN T 153.8mg / L, Cu 2+ It was 139.25mg / L, As was 14.78mg / L, Pb was 8.36mg / L, other pollutants were not detected, and the toxic leaching result was hazardous waste. The slurry mixing system is in an oxidation reaction tank equipped with a stirring system. 2 kg of cyanide-containing tailings slag with a water content of 35% is added to the oxidation reaction tank, and then 1.6L of slurry mixing liquid is added to the oxidation reaction tank. The mass ratio of slag is 1.77:1, turn on the stirring system, stir for 30min under the condition of stirring line speed of 5m / s, add 5.6g of ferrous sulfate heptahydrate and zinc sulfate heptahydrate with a mass ratio of 2.5:1, and react for 20...

specific example 2

[0029] The cyanide-containing tailings slurry of a gold mine was filtered by a plate and frame filter press, and the moisture content of the cyanide-containing tailings slag was 32%. The tailings slag was leached with toxicity, and the pH value of the pollutants in the leachate exceeded the standard. 11.89, CN T 93.1mg / L, Cu 2+As was 27.65mg / L, As was 8.78mg / L, Pb was 6.86mg / L, other pollutants were not detected, and the toxic leaching result was hazardous waste. The slurry mixing system is in an oxidation reaction tank equipped with a stirring system. Add 500kg of cyanide-containing tailings slag with a moisture content of 32% into the oxidation reaction tank, and then add 400L of slurry mixing liquid into the oxidation reaction tank. The mixing liquid and tailings slag The mass ratio is 1.65:1, turn on the stirring system, stir for 45 minutes at a stirring line speed of 8m / s, add 1.4kg of ferrous sulfate heptahydrate and zinc sulfate heptahydrate mixed agent with a mass rati...

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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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 李哲浩迟崇哲吴铃丁成邱陆明
Owner CHANGCHUN GOLD RES INST
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