Cyanide tailing decyanation method based on catalytic oxidation of activated carbon

A technology of cyanidation tailings and catalytic oxidation, which is applied in the field of environmental protection, can solve the problems of affecting the recovery of valuable metals in tailings, the unstable cost of cyanide residues, and environmental pollution, etc., and achieves easy operation, strong adsorption capacity, and large specific surface area Effect

Active Publication Date: 2021-07-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The cyanide gold extraction process produces a large amount of cyanide tailings. The cyanide in these tailings will pollute the environment and affect the recovery of other valuable metals in the tailings.
At present, the traditional chemical decyanation method used to treat cyanide slag has problems of instability or high cost, and the addition of heavy metal copper as a catalyst will pollute the environment and waste resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add water to the cyanide tailings to make a slurry with a mass concentration of 10%;

[0027] Adjust the pH value of the pulp to 10.0 with sodium hydroxide to make the adjusted pulp;

[0028] Add oxidant sodium metabisulfite and catalyst activated carbon to the adjusted pulp to make mixed pulp; the amount of oxidant added is 4g per liter of alkaline pulp, and the amount of catalyst added is 5g per liter of pulp; activated carbon is selected from bamboo charcoal;

[0029] At a temperature of 20-40°C, air is introduced into the mixed pulp to stir and carry out an oxidation reaction. The oxidation reaction time is 30-120 minutes to obtain the reaction material;

[0030] Filter the reaction material with a filter press to obtain filter residue and filtrate; the content of cyanide in the toxic leachate of the filter residue is 4 mg / L, which is directly discharged; the content of cyanide in the filtrate is 90 mg / L.

Embodiment 2

[0032] Method is with embodiment 1, and difference is;

[0033] (1) The mass concentration of the pulp is 20%;

[0034] (2) adjust the pH value to be 11.0;

[0035] (3) The add-on of oxidizing agent is to add 2g per liter of alkaline pulp, and the add-on of catalyst is to add 10g per liter of pulp; activated carbon selects coconut shell charcoal;

[0036] (4) The oxidation reaction temperature is 20-40°C, and the oxidation reaction time is 30-120 minutes;

[0037] (5) The content of cyanide in the toxic leachate of the filter residue is 3mg / L, which is directly discharged; the content of cyanide in the filtrate is 85mg / L.

Embodiment 3

[0039] Method is with embodiment 1, and difference is;

[0040] (1) The mass concentration of the pulp is 30%;

[0041] (2) adjust the pH value to be 10.5;

[0042] (3) The add-on of oxidizing agent is to add 10g per liter of alkaline pulp, and the add-on of catalyst is to add 2g per liter of pulp; activated carbon selects shell charcoal for use;

[0043] (4) The oxidation reaction temperature is 20-40°C, and the oxidation reaction time is 30-120 minutes;

[0044] (5) The content of cyanide in the toxic leachate of the filter residue is 2 mg / L, which is directly discharged; the content of cyanide in the filtrate is 92 mg / L.

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PUM

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Abstract

The invention discloses a cyanide tailing decyanation method based on catalytic oxidation of activated carbon. The method comprises the following steps: (1) adding water into cyanide tailings to prepare ore pulp; (2) adjusting a pH value to be 10.0 to 11.0; (3) adding an oxidizing agent and a catalyst; (4) at a temperature of 20-40 DEG C, introducing air, conducting stirring and carrying out an oxidation reaction; and (5) performing filter pressing. The method is simple in process and easy to operate; the reaction can be carried out under normal pressure; and a high-power reactor is not needed, so production energy consumption is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a method for decyanation of cyanidation tailings based on catalytic oxidation of activated carbon. Background technique [0002] The cyanide gold extraction process produces a large amount of cyanide tailings. The cyanide in these tailings will pollute the environment and affect the recovery of other valuable metals in the tailings. At present, the traditional chemical decyanation method used to treat cyanide slag has problems of instability or high cost, and the addition of heavy metal copper as a catalyst will pollute the environment and waste resources. How to efficiently break cyanide slag has become a major problem in this field. Contents of the invention [0003] The purpose of the present invention is to provide a method for decyanation of cyanidation tailings based on activated carbon catalytic oxidation, which reacts the cyanide tailings under the syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/38A62D101/45
CPCA62D3/38A62D2101/45
Inventor 杨洪英佟琳琳韩雯雯陈国宝金哲男
Owner NORTHEASTERN UNIV
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