| As people's attention to environmental protection,in order to reduce vehicle exhaust emissions,the promotion of electric vehicles in China is steadily carried out,and the old generation of electric vehicles have been gradually retired.New-generation power batteries with higher energy density have been developed and manufactured.However,the current battery technology is still cannot leave a high energy storage density of cobalt,nickel,lithium,and our country most of the dependence on imported cobalt,nickel resources,cobalt,nickel and continue in a state of the demand.In order to reduce the dependence of China's important strategic metals on imports and reduce the secondary pollution of used power batteries,it is necessary to accelerate the construction of a scientific battery recycling system.This article focuses on the existing recycling process of used power batteries,researches and optimizes the problems encountered in production,and realizes the scientific recovery of cobalt,nickel,manganese,lithium,aluminum and other elements.The process selected for the project has the characteristics of cleanliness and environmental protection.It comprehensively considers the economic benefits,social benefits and sustainable development requirements.At the same time,the resources are recycled to avoid re-pollution of the environment.This article scientifically demonstrates the technical reliability of the project and the economics of the project,and draws conclusions from the facts.The main research contents and conclusions are as follows:(1)Due to the high content of manganese in the anode waste of NCM batteries,the manganese of NCM waste power battery anode material acid leaching solution can't be completely removed with aeration method.High concentration of manganese will affect the purity of cobalt and nickel products in the extraction section,and reduce the amount of water in the extraction and removal section of P204.In this paper,combined with the existing electrolytic manganese dioxide production process,it is proposed to use electro-catalytic oxidation to remove manganese.(2)In the production,the battery will be entrained in the waste metal such as magnesium,copper and iron,to take measures for different metals,take different measures for different metals to separate and recycle valuable metals as much as possible.In the pre-extraction treatment stage,copper is replaced by iron powder to produce foamed copper,and the iron is oxidized with hydrogen peroxide to form sodium jarosite crystal,Lithium is obtained by concentrating hot saturated lithium carbonate.(3)The extraction section adopts a full extraction and full return process,using P204 to remove impurities,P507 to extract and separate cobalt and nickel,and Cyanex272 to extract and remove magnesium.This process is mainly aimed at the separation of magnesium in raw materials.After the extraction of magnesium,Cyanex272 reverse extraction solution was deposited to remove magnesium,and the magnesium precipitation wastewater could be treated in the MVR evaporator.(4)Aiming at the problems of waste water treatment recycling process,which caused excessive water insolubles in products and blackening of the color of sodium sulfate,in order to reuse the production wastewater,a more economical wastewater treatment and distilled water recycling process was designed and studied.The ton oxidation method studies the treatment effect of wastewater to meet the MVR evaporation standard and reduce pollution discharge.The product and technical solutions selected in this article are based on the premise of environmental benefits,maximizing economic benefits and improving the project's ability to resist risks. |
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