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Method for recycling metal cyanide complex in gold mine cyanide-containing wastewater and recycling wastewater through precipitation-gas flotation process

A waste water circulation and cyanide waste water technology, applied in the direction of flocculation/sedimentation water/sewage treatment, metallurgical waste water treatment, flotation water/sewage treatment, etc., can solve the problems of strong corrosive medium, large solvent loss, high operating cost, etc., to achieve High metal recovery rate, reduced treatment costs, and weak medium corrosion

Inactive Publication Date: 2018-11-16
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively recover cyanide in wastewater, but the recovery rate of metal ions such as copper and zinc is insufficient
In addition, this technology also has problems such as high investment cost and strong corrosion of the medium.
Solvent extraction can recover most of the metals in wastewater, but due to the large loss of solvent in the extraction process and high operating costs, there are currently few application examples
In the process of treating cyanide-containing wastewater by ion resin, metal complex ions can be strongly adsorbed on the resin, which brings difficulties to the elution and regeneration of the resin, and at the same time reduces the saturated adsorption capacity of the resin, so this method is limited in the actual treatment process. application in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The cyanide-containing wastewater of a gold mine has a pH value of 12, a total cyanide content of 2700 mg / L, a copper ion content of 730 mg / L, a lead ion content of 12 mg / L, and a small amount of gold and silver ions.

[0027] (1) In the pretreatment reaction tank, the pH value of the wastewater is detected online, and the wastewater is stirred at 150 rpm. During the stirring process, dilute sulfuric acid is slowly added to adjust the pH value of the wastewater to 6.9;

[0028] (2) Wastewater circulation requires that the metal cyanide ion content be lower than 7mg / L. Continue to stir, add 100g / m2 to the waste water 3 Octadecyltrimethylammonium chloride, after the formation of flocs, the residual metal cyanide ion concentration in the test water is higher than 7mg / L, continue to increase the dosage of octadecyltrimethylammonium chloride until the residual metal cyanide The ion concentration is lower than 7mg / L;

[0029] (3) Waste water is introduced in the mine flotat...

Embodiment 2

[0033] The cyanide-containing wastewater of a gold mine has a pH value of 11.5, a total cyanide content of 1500 mg / L, a copper ion content of 410 mg / L, and a lead ion content of 15 mg / L.

[0034] (1) In the pretreatment reaction tank, the pH value of the wastewater is detected online, and the wastewater is stirred at 150 rpm. During the stirring process, dilute sulfuric acid is slowly added to adjust the pH value of the wastewater to 6.1;

[0035] (2) Wastewater circulation requires that the metal cyanide ion content be lower than 20mg / L. Continue to stir, add 100g / m2 to the waste water 3 Cetyltrimethylammonium bromide, after the formation of flocs, the residual metal cyanide ion concentration in the test water is higher than 20mg / L, continue to increase the dosage of cetyltrimethylammonium bromide until the residual metal cyanide The ion concentration is lower than 20mg / L;

[0036] (3) the waste water is introduced into the mine flotation column, aerated flotation, and the ...

Embodiment 3

[0040] The cyanide-containing wastewater of a gold mine has a pH value of 11, a total cyanide content of 1700 mg / L, a copper ion content of 530 mg / L, a lead ion content of 8 mg / L, and a small amount of gold and silver ions.

[0041] (1) In the pretreatment reaction tank, the pH value of the wastewater is detected online, and the wastewater is stirred at 180 rpm. During the stirring process, dilute sulfuric acid is slowly added to adjust the pH value of the wastewater to 6.5;

[0042] (2) Wastewater circulation requires that the metal cyanide ion content be lower than 15mg / L. Continue to stir, add 100g / m2 to the waste water 3 Dioctadecyl dimethyl ammonium chloride, after the formation of flocs, the concentration of residual metal cyanide ions in the test water is higher than 15mg / L, continue to increase the dosage of dioctadecyl dimethyl ammonium chloride until the residual metal The concentration of cyanide ion is lower than 15mg / L;

[0043] (3) waste water is imported in th...

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Abstract

The invention discloses a method for recycling metal cyanide complex in gold mine cyanide-containing wastewater and recycling wastewater through a precipitation-gas flotation process. The method comprises the following steps: adjusting the pH value of the wastewater to be 6-7 and enabling copper ions in the wastewater to mainly exist in form of [Cu(CN)3]<2->; adding a metal cyanide complex ion collecting agent into the wastewater, reacting with copper-cyanide complex ions and lead-cyanide complex ions to generate flocculent precipitates; carrying out gas flotation and recycling the precipitates in a gas flotation device; and adding coagulant and treating the remaining wastewater and recycling the precipitated supernatant liquor. The method is capable of removing 90% and above of metal cyanide complex ions in the wastewater; cyanide in the remaining wastewater mainly exists in the form of free cyanide; the method can effectively solve the problem of accumulation of metal ions in leachate in a cyaniding and gold-extracting process; the treated wastewater can be used as circulation water, is returned to the system and is recycled.

Description

technical field [0001] The invention relates to a precipitation-air flotation method for recovering metal cyanide complexes in gold mine cyanide-containing wastewater and a wastewater recycling method, which belongs to the technical field of wastewater treatment and resource recovery. Background technique [0002] At present, my country's gold production mainly adopts the cyanidation gold extraction process. The leachate produced after gold extraction contains not only precious metal ions such as gold and silver, but also heavy metal ions such as copper and lead. In the production process, the lean liquid with less metal ion content is returned to the system for recycling. As the barren solution is continuously recycled, metal ions such as copper and lead gradually accumulate in the leaching solution. The accumulated metal ions will increase the consumption of dissolved oxygen and sodium cyanide in the subsequent leaching process, and reduce the leaching efficiency of gold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/24C02F1/5236C02F1/56C02F1/66C02F9/00C02F2103/16C02F2301/08
Inventor 张明青曹亦俊吕鑫磊
Owner CHINA UNIV OF MINING & TECH
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