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Harmless method for treating cyanide-containing tailings slurry with biological oxidation solution in gold extraction process in gold industry

A biological oxidation and liquid treatment technology, applied in biological water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of poor treatment effect and increased operating costs of enterprises, and achieve low treatment cost and reduced lime consumption , The effect of reducing operating costs

Active Publication Date: 2021-04-06
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a harmless method for treating cyanide-containing tailings pulp with biological oxidation liquid in the gold extraction process in the gold industry, so as to solve the problems of poor treatment effect and increased operating costs of enterprises in the treatment of cyanide-containing tailings pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Include the following steps:

[0024] (1) In the state of stirring, add cyanide-containing tailings slurry into the closed reactor, open the air drainage device, and ensure that the gas generated during the reaction is introduced into the spray absorption device for absorption;

[0025] The linear velocity at the tip of the stirring blade is 3m / s, the concentration of the tailings slurry containing cyanide is 25%, and the absorption liquid in the spray absorption device is 10% sodium hydroxide solution;

[0026] (2), under agitation, add biological oxidation solution to the closed reactor to remove easily released cyanide and metal cyanide complex in the cyanide-containing tailings slurry, and the reaction time is 30min;

[0027] The linear velocity of the stirring blade tip is 3m / s, the pH value of the biological oxidation solution is 0.6, and the iron content in the biological oxidation solution is 5g / L; after adding the biological oxidation solution, the pH value of ...

Embodiment 2

[0035] Include the following steps:

[0036] (1) In the state of stirring, add cyanide-containing tailings slurry into the closed reactor, open the air drainage device, and ensure that the gas generated during the reaction is introduced into the spray absorption device for absorption;

[0037] The linear velocity at the tip of the stirring blade is 5m / s; the concentration of the tailings slurry containing cyanide is 35%; the absorption liquid in the spray absorption device is 15% sodium hydroxide solution.

[0038] (2), under agitation, add biological oxidation solution to the closed reactor to remove easily released cyanide and metal cyanide complex in the cyanide-containing tailings slurry, and the reaction time is 45min;

[0039] The linear velocity of the stirring blade tip is 5m / s; the pH value of the biological oxidation solution is 1.5, and the iron content in the biological oxidation solution is 25g / L; after adding the biological oxidation solution, the pH value of the...

Embodiment 3

[0045] Include the following steps:

[0046] (1) In the state of stirring, add cyanide-containing tailings slurry into the closed reactor, open the air drainage device, and ensure that the gas generated during the reaction is introduced into the spray absorption device for absorption;

[0047] The linear velocity at the tip of the stirring blade is 8m / s; the concentration of the tailings slurry containing cyanide is 45%; the absorption liquid in the spray absorption device is 20% sodium hydroxide solution.

[0048] (2), under agitation, add biological oxidation solution to the closed reactor to remove the easy-release cyanide and metal cyanide complex in the cyanide-containing tailings slurry, and the reaction time is 60min;

[0049] The linear velocity of the stirring blade tip is 8m / s; the pH value of the biological oxidation solution is 2.5, and the iron content in the biological oxidation solution is 40g / L; after adding the biological oxidation solution, the pH value of th...

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Abstract

The invention relates to a harmless method for treating cyanide-containing tailings pulp with a biological oxidation liquid in a gold extraction process in the gold industry, and belongs to the field of environmental protection. First, a closed stirring reactor is selected, and an air drainage device is installed on the upper part of the reactor. The hydrogen cyanide gas that may be generated in the reaction is introduced into the spray absorption device for absorption, and then the biological oxidation solution is added to the reactor, which will easily release cyanide and metals. Removal of cyanide complexes; the tailings slurry is filtered or press-pressed, and the tailings slag that is identified as general industrial solid waste is piled to the tailings pond; the filtrate is added with a pH neutralizer, reused in the production process or added to the filtrate Advanced treatment of chemicals and catalysts, the filtrate treatment to meet GB8978‑1996 "Integrated Wastewater Discharge Standard" for discharge. The invention treats waste with waste, and enterprises do not need to purchase harmless treatment chemicals, which greatly reduces the operating cost of gold production enterprises, and is of great significance to the clean production, energy saving and emission reduction and sustainable development of the entire gold industry.

Description

technical field [0001] The invention relates to a pollutant treatment method in the field of environmental protection, in particular to a harmless method for treating cyanide-containing tailings pulp with a biological oxidation liquid in a gold extraction process in the gold industry. Background technique [0002] Since the cyanidation method was applied to gold extraction in 1887, it has been widely used in the gold industry due to its high recovery rate, strong adaptability to ore, low cost, and localized gold. At present, 80% of the world's gold production is obtained by using the cyanidation gold extraction process, and the cyanide-containing tailings slurry produced by it is harmful to the natural environment during the stacking process. According to the "Environmental Protection Tax Law of the People's Republic of China", from January 1, 2018, the pollution discharge fee will be changed to an environmental protection tax, and it will rise to the legal level. Enterprise...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/18C02F103/16
CPCC02F1/001C02F1/66C02F3/34C02F3/348C02F9/00C02F2101/18C02F2103/16
Inventor 高飞翔李哲浩降向正兰馨辉
Owner CHANGCHUN GOLD RES INST
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