Recovery method for removing fluorine from nickel-cobalt-manganese solution

Abstract

The invention relates to a recovery method for removing fluorine from a nickel-cobalt-manganese solution. The method comprises the following steps of: carrying out acid leaching and impurity removal on battery powder to obtain a fluorine-containing nickel-cobalt-manganese solution; mixing the obtained fluorine-containing nickel-cobalt-manganese solution with a fluorine removal agent to obtain a mixed slurry; adjusting the pH value of the obtained mixed slurry to 2-5, and performing filtering to obtain a first-stage defluorination filtrate and a first-stage fluorine-containing filter residue; washing the first-stage fluorine-containing filter residue, adding the washed first-stage fluorine-containing filter residue into alkali liquor, performing heating and stirring, and conducting filtering to obtain fluorine-containing filtrate and nickel-cobalt-manganese-containing filter residue. The method disclosed by the embodiment of the invention has a good fluorine removal effect in the front-section nickel-cobalt-manganese solution, meanwhile, other impurities are not introduced, the obtained fluorine-containing filter residue can meet the requirements of industrial cryolite products after being purified, and the method has great economic benefits.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery recycling, and in particular relates to a method for removing fluorine in a nickel, cobalt, manganese sulfate solution after acid leaching waste battery powder. Background technique [0002] Lithium-ion batteries have been widely used in various electronic products and electric vehicles and other industries. According to statistics, my country's lithium-ion battery production accounts for more than 50% of the world, and the output in 2019 is 15.72 billion. The rapid expansion of lithium-ion battery production capacity also means In recent years, there will be a large number of lithium-ion batteries that need to be scrapped and recycled. If they are not handled properly, they will cause environmental pollution and waste of resources. Therefore, the recycling of lithium-ion batteries is imminent, which is important for environmental protection and sustainable development of resources. sign...

AI Technical Summary

Problems solved by technology

For the recovery of positive electrode powder, the method of inorganic acid leaching is mainly used to transfer valuable metals from solid powder to solution, and effectively separate them from carbon black and organic binders, but at the same time, fluorine in the electrolyte or subsequent impurity removal All the fluorine introduced will enter the solution, which will affect the process of wet recovery of nickel, cobalt and manganese, mainly including: 1) the impact on the product quality of the nickel, cobalt and manganese ternary precursor; 2) the defluorination of the subsequent wastewater treatment process The pressure is high, and the current defluorination process is difficult to meet the wastewater discharge requirements, and the treatment cost is high; 3) The fluorine in the wet system will be corrosive to the equipment and shorten the service life of the equipment; 4) It is easy to cause pipeline blockage

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