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A kind of treatment method of lithium cobalt oxide production wastewater

A technology for the production of waste water and treatment methods, which is applied in natural water treatment, water/sewage treatment, multi-stage water/sewage treatment, etc. It can solve the problems of poor adsorption capacity, complex operation and management, and high cost of lithium cobaltate, and achieve good adsorption Removal effect, improvement of exchange capacity, effect of improvement of removal efficiency

Active Publication Date: 2020-08-28
SHANDONG ENVIRONMENTAL PROTECTION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dosing and precipitation method cannot completely remove various pollutants in the wastewater; although the membrane filtration method, especially the membrane treatment method, can reduce the heavy metal content in the wastewater to below 0.1mg / L, it has complex operation and management and produces a large amount of heavy metals. Concentrated water with a content of more than 100mg / L and other issues, this type of concentrated water is hazardous waste, and needs to be sent to professional treatment institutions for treatment and the cost is extremely high
Although the ion exchange method has strong adsorption capacity for lithium carbonate, tricobalt tetroxide and lithium bicarbonate, the adsorption capacity for lithium cobalt oxide and lithium hydroxide is very poor, and the removal rate is less than 30%.
Although the evaporation method can fully meet the requirements of recycling, it is also limited in practical application due to high investment and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 10L lithium cobalt oxide production wastewater and place it in a 15L container. Add 10ml of polyaluminum chloride solution with a concentration of 1% and 10ml of polyacrylamide with a concentration of 0.1% into the container respectively, stir for 10min and then let stand for 1h. Take 5L of the supernatant and enter the multimedia filter device for filtration. The filtered filtrate is placed in a 10L container, and sulfuric acid is added to control the pH value to be 3.5-4. After continuous stirring for 5 hours, it enters the chelating resin adsorption device for adsorption. After adsorption, 4.5 L of filtrate was obtained. See Table 1 for specific data:

[0031] Table 1

[0032] project Lithium cobaltate cobalt oxide lithium hydroxide lithium carbonate lithium bicarbonate lithium sulfate pH value suspended matter raw water 44.33 7.23 0.21 13.33 3.38 0.03 7.8 144 dosing precipitation 40.14 2.11 0.21 13.31 3.30 no...

Embodiment 2

[0034] Take 10L lithium cobalt oxide production wastewater and place it in a 15L container. Add 10ml of polyaluminum chloride solution with a concentration of 1% and 10ml of polyacrylamide with a concentration of 0.1% into the container respectively, stir for 10min and then let stand for 1h. Take 5L of the supernatant and enter the multimedia filter device for filtration. The filtered filtrate is placed in a 10L container, and sulfuric acid is added to control the pH value to be 3.5-4. After continuous stirring for 6 hours, it enters the chelating resin adsorption device for adsorption. After adsorption, 4.5 L of filtrate was obtained. See Table 2 for specific data:

[0035] Table 2

[0036] project Lithium cobaltate cobalt oxide lithium hydroxide lithium carbonate lithium bicarbonate lithium sulfate pH value suspended matter raw water 44.33 7.23 0.21 13.33 3.38 0.03 7.8 144 dosing precipitation 40.14 2.11 0.21 13.31 3.30 no...

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PUM

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Abstract

The invention discloses a treatment method of lithium cobaltate production wastewater. The method comprises following steps: 1) a precipitator is added to to-be-treated lithium cobaltate production wastewater to perform chemical precipitation treatment on the wastewater, and the mixture is stirred and then left to stand; 2) precipitates obtained after standing in the step 1) are removed, a liquidsupernatant is filtered, sulfuric acid is added to the liquid supernatant, the pH value of the liquid supernatant is controlled at 3.5-4, and a reaction is performed for 5-7 h; 3) the liquid supernatant obtained after the reaction in the step 3) is filtered by heavy metal chelated resin, and treatment of the lithium cobaltate production wastewater is completed. In order to solve the problem that the heavy metal chelated resin has low adsorption capability for lithium hydroxide, lithium cobaltate and other compounds, the existence form of cobalt and lithium in the wastewater is changed throughpretreatment, lithium cobaltate and lithium hydroxide in the wastewater are changed into lithium sulfate through chemical reactions. The exchange capacity of the heavy metal chelated resin for heavy metals is increased, and the treatment efficiency of the lithium cobaltate production wastewater is improved.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment method for lithium cobalt oxide production wastewater. Background technique [0002] In the production process of lithium cobaltate, 500-600kg of cobalt tetroxide, 350-500kg of lithium carbonate and 50-100kg of additives are consumed for every ton of lithium cobaltate synthesized. For every ton of lithium cobalt oxide produced, 150kg of wastewater containing lithium cobalt oxide, tricobalt tetroxide, lithium carbonate, lithium bicarbonate, lithium hydroxide, and lithium bicarbonate needs to be produced. Among them, the concentration of lithium cobaltate is generally 40-80mg / L, the content of tricobalt tetroxide is 5-10mg / L, the content of lithium carbonate is 10-15mg / L, lithium hydroxide is 0.2-0.25mg / L, and lithium bicarbonate is 3-4mg / L . Due to the low content of various substances in wastewater, there is no recycling value, but direct discharge wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/34
CPCC02F1/001C02F1/281C02F1/42C02F1/5236C02F1/56C02F1/66C02F9/00C02F2103/34
Inventor 张成翟继彬陈鹏
Owner SHANDONG ENVIRONMENTAL PROTECTION IND CO LTD