Method for removing cobalt in cobalt-containing wastewater

A waste water and ph value technology, which is applied in the chemical industry, can solve the problems of cobalt-containing waste water not meeting the national discharge standard and low cobalt removal efficiency, and achieve the effect of high benefit and low content

Active Publication Date: 2014-06-11
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Abstract
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AI Technical Summary

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 mee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 2000mL of cobalt-containing wastewater, whose cobalt concentration is 29.5mg / L, add a concentration of 30% sodium hydroxide solution, adjust the pH value to 11.02, then add 20mL concentration of 10% sodium hypochlorite solution under stirring conditions, place The reaction was carried out under sunlight for 10 hours to obtain a precipitate, which was removed by filtration with filter paper to obtain a filtrate, which was detected by AAS and had a cobalt concentration of 0.9 mg / L.

Embodiment 2

[0031] Take 2000mL of cobalt-containing wastewater, whose cobalt concentration is 17.3mg / L, add a concentration of 30% sodium hydroxide solution, adjust the pH value to 11.51, then add 20mL concentration of 10% sodium hypochlorite solution under stirring conditions, place The reaction was carried out under sunlight for 15 hours to obtain a precipitate, which was removed by filtration with filter paper to obtain a filtrate whose cobalt concentration was 0.85 mg / L as detected by AAS.

[0032] It can be seen from the above examples that the method provided by the embodiment of the present invention has a high removal efficiency of cobalt, and can effectively reduce the cobalt content in the cobalt-containing wastewater, so that the wastewater can be discharged up to the standard.

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/30C02F1/72
CPCY02W10/37
Inventor 朱珠沈恒冠陆益展蔡运和李配明
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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