Method for efficiently removing fluorine from waste lithium battery
The invention discloses a method for efficiently removing fluorine from a waste lithium battery. The method comprises the following steps of mixing aluminum and a sodium hydroxide solution for reaction to obtain a sodium metaaluminate solution, introducing sulfuric acid into the sodium metaaluminate...
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Main Authors | , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
21.01.2022
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Subjects | |
Online Access | Get full text |
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Summary: | The invention discloses a method for efficiently removing fluorine from a waste lithium battery. The method comprises the following steps of mixing aluminum and a sodium hydroxide solution for reaction to obtain a sodium metaaluminate solution, introducing sulfuric acid into the sodium metaaluminate solution, carrying out stirring for reaction at a certain temperature to obtain a fluorine removal agent, adding a sodium fluoroaluminate seed crystal and the fluorine removal agent into an impurity-removed battery powder leaching solution, introducing a sodium carbonate solution at the same time, carrying out reaction at a certain temperature, controlling the pH value of a reaction endpoint, carrying out solid-liquid separation after the reaction is finished to obtain a fluorine-removed liquid and filter residues, adding a sodium hydroxide solution into the filter residues, carrying out reaction, and carrying out solid-liquid separation to obtain a filtrate containing fluorine and aluminum and insoluble residues. |
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Bibliography: | Application Number: CN202111144865 |