Method for removing cyanogen and recycling copper by mixing bacterial liquid and copper-containing and cyanogen-containing wastewater

Abstract

The invention discloses a method for removing cyanogen and recycling copper by mixing bacterial liquid and copper-containing and cyanogen-containing wastewater. The method comprises the following steps: mixing a bacterial solution with a potential of 600 mV or more with the copper-containing and cyanide-containing wastewater, conducting heating to 30 DEG C, performing inflating for 2 hours, controlling a pH value to be 3-4.5, carrying out dense filtration, adding hydrogen peroxide into a filtrate to allow a total cyanide content to be reduced from 0.5-5 mg / L to 0.5 mg / L or below, carrying out resin copper adsorption on cyanogen-removed liquid, performing desorbing, recycling a desorption product as copper sulfate, and discharging or recycling the copper-removed liquid. The new method has the main advantages that existing resources can be fully utilized, the dosage of chemicals is reduced, income is increased, and the process is economically feasible and is an economical and effective treatment and recovery process.

Description

Technical field: [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for removing cyanide and recovering copper by mixing bacterial liquid with copper- and cyanide-containing wastewater. Background technique: [0002] There are many treatment methods for cyanide-containing wastewater in China. In the early days, there were alkali chlorine method (liquid chlorine method, sodium hypochlorite method, bleaching powder method, chlorine dioxide method, etc.), acid chlorine method, Inco method, acidification absorption-neutralization method, ozone method, Electrolysis method, ion exchange method, activated carbon catalytic oxidation method, biological method, pressurized hydrolysis method, etc. In the 1990s, solvent extraction method, hydrogen peroxide-copper catalytic oxidation method, acidification precipitation-neutralization method (two-step precipitation method), etc. began to appear, and combined treatment processes were also widely ...

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Problems solved by technology

[0005] The product structure of the above methods is relatively simple, and for CN - , OH - How much waste is there, the existing method is to the CN in the copper-containing cyanide wastewater - , OH - Both can be used, copper and other metal ions in the solution can be recovered, and can be further applied to mine copper where gold and copper coexist, so that the raffinate of low-grade copper ore oxidized by the bacterial solution can be combined with the cyanide gold leaching barren solution Blending to form a cost-effective treatment and recovery process

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