Method for treating xanthate-containing heavy metal flotation wastewater

Abstract

The invention discloses a treatment method of xanthate-containing heavy metal flotation wastewater, and belongs to the technical field of beneficiation wastewater treatment. The treatment method of the xanthate-containing heavy metal flotation wastewater comprises the following steps: a catalytic oxidizer is taken and added into flotation wastewater to be treated according to the weight ratio is (0.5-10):1000, wherein the catalytic oxidant is elemental iron and / or manganese dioxide, the molar ratio of the elemental iron to the manganese dioxide is 1:(0-1), then stirring or aeration, aging andfiltering are conducted, filtrate and precipitate are obtained respectively, the filtrate is treated flotation wastewater, and the precipitate is recycled. According to the treatment method of the xanthate-containing heavy metal flotation wastewater, xanthate in the flotation wastewater can be degraded, heavy metal in the flotation wastewater can be synchronously and deeply removed, and the heavymetals can be recycled.

Description

technical field [0001] The invention relates to a treatment method for flotation wastewater containing xanthate heavy metals, and belongs to the technical field of ore dressing wastewater treatment. Background technique [0002] According to statistics, 60%-70% of ores at home and abroad are processed by flotation, which mainly includes steps such as grinding and grading of ores, dosing and adjustment, and aerated flotation. Under normal conditions, the water consumption per ton of raw ore for flotation treatment is 4-7 tons. The selected dosage is several grams to tens of grams. Due to the addition of flotation agents, the flotation wastewater becomes complex polluted wastewater where residual flotation agents and heavy metals coexist. At present, flotation wastewater mainly adopts natural degradation, coagulation sedimentation, chemical precipitation, biochemical and oxidation methods, and the most widely used method is coagulation sedimentation method. The amount is la...

AI Technical Summary

Problems solved by technology

Most of the xanthate-containing flotation wastewater is wet discharged to the tailings pond for natural degradation. The xanthate is degraded to a certain extent, but the degradation products cannot be discharged directly to the external environment, which is uneconomical and easy to cause secondary pollution. The subsequent treatment steps are complicated.

[0004] At present, chemical oxidation is considered to be a more effective method. Commonly used oxidants are hydrogen peroxide, sodium hypochlorite and Fenton’s reagent, etc., among which hydrogen peroxide and Fenton’s reagent are required to be carried out under acidic conditions, and the best oxidation condition for sodium hypochlorite is neutral and slightly alkaline. Dosing acid-base agent to adjust the pH value, consumes a lot of energy and chemicals, and the operating cost is high

For example, "A Treatment Method for Wastewater Containing Xanthate" with the Chinese invention patent application number 201810583726.0 discloses a treatment method for waste water containing xanthate. The method uses ZSM-5 molecular sieve and hydrogen peroxide at pH ≤ Catalytic degradation under 11 conditions realizes the complete degradation of xanthate, but the cost of the agent is relatively high. The patent discloses that the consumption of hydrogen peroxide is 0-300mmol / L. According to the hydrogen peroxide consumption of 100mmol / L, the market price of 10% hydrogen peroxide is Calculated at 1,000 yuan / ton, the chemical cost for treating 1 ton of xanthate-containing wastewater is 34 yuan. The cost of the chemical agent is high, and only xanthate is degraded, and the simultaneous removal of heavy metals is not involved.

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