Method for removing cobalt in cobalt-containing wastewater

Abstract

The invention provides a method for removing cobalt in cobalt-containing wastewater. The method comprises the following steps: reacting the cobalt-containing wastewater and a sodium hypochlorite solution in sunshine under the condition that the pH value is 10-12 so as to obtain a precipitate, and filtering to remove the precipitate. By utilizing the properties of sodium hypochlorite and catalytic action of sunshine, the ion cobalt in the cobalt-containing wastewater is oxidized and precipitated, the cobalt precipitate is filtered and removed, and the content of metal ion cobalt in the cobalt-containing wastewater can be effectively reduced, so that the wastewater can reach the standard to emit, and the metal cobalt can be recycled. The method provided in the invention can be used for treating the wastewater generated in the production process of various cobalt salts such as cobaltosic oxide by virtue of wet preparation, the sedimentation effect is good, novel pollutants are not introduced, and the method is low in cost, simple in operation and suitable for industrialization and has high economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for removing cobalt in cobalt-containing wastewater. Background technique [0002] At present, lithium-ion batteries have been widely used in mobile phones, notebook computers and other products. Therefore, the demand for cobalt-containing compounds that can be used as cathode materials for lithium-ion batteries is also rapidly increasing. However, when preparing cobalt-containing compounds, a large amount of cobalt-containing wastewater will be produced. If the cobalt therein cannot be effectively removed, it will not only pollute the environment, but also cause waste of scarce cobalt. It can be seen that the research on the method of removing cobalt in cobalt-containing wastewater has very significant social and economic benefits. [0003] In the prior art, cobalt is mainly removed from cobalt-containing wastewater by physical methods using ion exchange re...

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Problems solved by technology

[0004] Although the above method is simpler than the ion exchange resin method, the removal efficiency of cobalt is low, and new sulfide pollutants are introduced, so that the treated cobalt-containing wastewater cannot meet the national discharge standards, that is, the Chinese national standard GB25467- The 2010 Copper, Nickel and Cobalt Industrial Pollutant Discharge Standard stipulates that the content of cobalt should be less than 1mg / L