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
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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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