Research On Recovery Of Valuable Element From Spent Lithium Ion Battery By The Sulphating Roasting

This article discusses the research status and progress of the resource recycling of waste lithium ion battery. At present there are mainly four kinds of recycling method:Wet recovery、Fire recovery、Situ repair of cobalt acid lithium、Preparation of other substances from waste LiCoO2. This article summarizes the existing advantages and disadvantages of all kinds of recycling technology. In this article put forward the recycling method of metals in lithium ion battery cathode material use acidification burning method, and on this account develop a recovery technology of valuable metals in waste LiCoO2by low temperature acid roasting、Waste water leaching and precipitation process.And all of this is based Potassium hydrogen sulfate focal potassium sulfate can occur when heated to a certain thermal dissociation temperature dissociation reaction and generate SO3gas and These compounds can with some metal oxides, such as Al2O3through eutectic generated after water soluble sulfate.Using TG-DSC-MS、XRD、SEM、EDS method research the thermal decomposition behavior of potassium pyrosulfate、Potassium bisulfate and LiCoO2; Research physical state of Co, K, O, S under the given conditions at different calcination temperatures; Research the type compounds and the form of occurrence and the composition of calcined product profile element content distribution.Waste lithium ion battery discharge after dismantling alkali leaching filtration drying to obtain the anode material powder containing adhesive, and After high temperature roasting agent removal adhesive containing a small amount of Co3O4. According to the n (Co):n (S) of the mole ratio of1:3proportion uniform grinding the mixture of K2S2O7/KHSO4and LiCoCO2. After roasting0.5h in muffle furnace under different calcination temperature constant temperature and then the mixture from black to brown. When roasting temperature is below200℃, only physical stripping of adsorbed water, mixture of total quality product morphology and phase composition has no obvious change, can still be observed obvious grain shape; With the increase of calcination temperature, product appearance reunion phenomenon began to appear, block granular material at the surface of the precipitation, and during400℃～500℃SO2andO2gas detected, phase composition gradually becoming KLiSO4、K2Co2(SO4)3、K2SO4. When roasting temperature of600, the diffraction peak of K2SO4disappear, Only K2Co2(SO4)3KLiSO4diffraction peak, it’s result of elements K and element Li、Co in the high temperature effect descending into sulfate composite. Co、S、O、K element in dispersion state in roasting product evenly distributed.