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Wet Extraction of Cobalt and Aluminum in Lithium-Ion Batteries in Cell Phones

Author: ChengJiaRong
Tutor: ChenChangGuo；WangJian
School: Chongqing University
Course: Environmental Engineering
Keywords: lithium-ion batteries lithium cobalt acid dimethylformamide sulfuric acid hydrogen peroxide
CLC: TM912
Type: Master's thesis
Year: 2009
Downloads: 305
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Abstract


With growth oflithium-ion batteries in their daily lives, as well as other aspects of the application, the volume of its waste is also increasing gradually.The resulting environmental pollution and waste of resources is also becoming more prominent.Therefore, lithium-ion battery scrap recycling disposal has become an increasingly pressing issue.In the current disposal methods , recycling is the the hot spot of research.It not only can solve the environmental problems caused by lithium-ion battery scrap, but also can alleviate the tension of resources by recycling the value parts of the battery .In this dissertation, the comprehensive utilization of resources from the point of view, summed up waste recycling lithium-ion battery of the status quo; And lithium-ion batteries used in the high economic value of high cobalt, aluminum and lithium metal recycling process element method and its influencing factors in the study, Based on the result of determining the wet waste recycling extremely Lithium cobalt film of cobalt, aluminum and lithium elements of the new process.Cobalt, aluminum and lithium elements mainly in lithium-ion battery cathode material of lithium cobalt films. At present, lithium-ion battery recycling process, such as cathode material described in the text, most of the complexity of the existence of technology, equipment requirements will lead to environmental pollution, energy consumption of the larger issues such as. Previous solvent separation and wet chemical method from lithium-ion batteries used in the leaching process of cobalt. On this basis a lower cost to take the organic solvent dimethylformamide dissolved lithium cobalt binder PVDF membrane separation of aluminum foil idea. Through experiments to determine the conditions at 60℃, when the solvent dimethylformamide with lithium-cobalt ratio of membrane 10ml: 1.5g, the foil can be attached to the cathode and the complete separation of active substances. Adopt multi-stage process can be fully dissolved volatile solvent dimethyl formamide dissolving capacity of the binder. PVDF dissolved to saturation of the organic solvent can be carried out by direct distillation of renewable recycling, renewable sources of solvent with new solvent dissolves the same effect.Dissolved organic solvent residue contains LiCoO2 Baptist and acetylene black. The use of sulfuric acid and hydrogen peroxide system as a leaching of the slag leaching of cobalt, lithium leaching. Studied the leaching agent concentration, the amount of leaching agent, leaching liquid-solid ratio, leaching temperature, leaching time on the leaching effect. Through single-factor experiments and orthogonal test, the conclusion: In ensuring a higher leaching rate under the premise of choice leaching temperature of 75℃, the concentration of sulfuric acid 6mo1 / L, liquid-solid than 40ml / g, the amount of hydrogen peroxide 12m1, leaching time 60min.Co-ion and lithium-ion-recycling programs are: Oxalate precipitation with cobalt, the experimental conditions for pH = 4 ~ 5, temperature 40 ~ 50℃; with saturated sodium carbonate lithium precipitation, sedimentation rate greater than 95%.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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