| As anode material of lithium-ion battery,lithium titanate has an important place in the anode material of lithium-ion battery due to its high stability and safety,also fast charging speed,high current intensity and strong stability,and mainly used in electrical vehicle area and 3C industry(computers,cellphone and Communication).More than that,lithium titanate has been used in energy storage systems for auxiliary grids and military applications.From the beginning of the electric vehicles promoting to now,large numbers of lithium-ion batteries has gradually wasted.Considering the environmental problem of wasted lithium-ion batteries pollution and the comprehensive recycling the lithium titanate resources,It has a great significance to recycle and reused the wasted lithium-ion battery of lithium titanate with the reasonable way.This paper used low cost chemical reagents as raw materials,both titanium and lithium were separated and recovered in the lithium titanate by selected joint mineral processing methods and metallurgy methods,Lithium carbonate and titanium dioxide were made by it respectively.Firstly,the disassembled used lithium ion battery was wet grinding and flotating pretreatment by means of mineral processing,and some plastic battery casings,toner and other impurities in the battery waste are removed by a flotation process,and then the lithium and titanium in the lithium titanate were separated by dilute acid using leached method.The lithium were leaching solution was concentrated and decontaminated to prepare lithium carbonate,and the titanium-containing leaching slag was prepared by oxidizing roasting to prepare titanium dioxide,mainly steps were as follows:The pretreatment stage used the process of rod grinding and flotation in mineral processing methods.By adding flocculant aluminum sulfate in the rod grinding process,kerosene and frothier were added as collector and foaming agent respectively during flotation.The carbonaceous mud were collected with concentrate grade13.49 and concentrate recovery of 67%.The carbon powder and the plastic outer casing of the battery contained in wasted lithium ion battery were reduces,which improved the leaching and roasting efficiency in next stage.“Leaching priority” method was used to processing the wasted battery,opened the lithium titanate material by appropriate leaching condition,lithium were leaching solution was concentrated and decontaminated to prepare lithium carbonate,and the titanium-containing leaching slag was prepared by oxidizing roasting to preparetitanium dioxide.Various process parameters such as concentration of sculptured acid,leaching temperature were examined in terms of metal leaching efficiency.The final lithium leaching rate was 90%,the comprehensive recovery rate was 92%,and the titanium leaching rate was only 1.08%,the unleached titanium was reserved in the leaching slag.Lithium and titanium were speared well by using the “leaching priority”method,which provides good conditions for the next comprehensive recycling stage.The lithium-containing leachate was prepared to make the battery grade lithium carbonate by adding saturated sodium carbonate solution.First,heating the lithium-containing leachate and concentrated it to 20g/L,and then precipitation the Mn ? Ni ? Ti and Ca ions by adjusting the alkali liquid.Then lithium-rich liquid obtained was obtained by adding a saturated sodium carbonate solution.The battery-grade lithium carbonate were made by precipitating?filtering and washing.Analysis the leaching slag by using the XRD and TG-DTA,investigate the impact of roasting atmosphere,calcination temperature,roasting time on the roasting process.The leaching slag was roasting into an industrial standard R1 grade titanium dioxide by appropriate roasting conditions. |
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