Sodium salt added roasting method of metal in recycled waste lithium battery cathode powder

Abstract

The invention discloses a sodium salt added roasting method of metal in recycled waste lithium battery cathode powder. The method comprises steps as follows: a waste lithium battery cathode powder andsodium salt mixture is added to a mixing machine, and a mixed material is obtained; the mixed material is sent into a hydraulic ball press for ball preparation, and material balls are obtained; the material balls are roasted, crushed, ground and subjected to acid leaching treatment, and an acid leaching solution is obtained. The method capable of effectively damaging the lattice structure of a cathode material, improving the leaching activity of target metals and reducing the acid amount in the following acid leaching procedure is provided, so that the production condition is optimized, the recovery rate of main metals such as lithium, nickel, cobalt, manganese and the like and the conversion rate of doped metals such as titanium, chromium, zirconium, yttrium, indium, tin, molybdenum, vanadium and the like are increased, and the production efficiency of the roasting and leaching sections is finally improved. Besides, resourceful utilization of the main metals and the doped metals in the waste lithium battery cathode powder is realized.

Description

technical field [0001] The invention relates to the technical field of positive electrode powders of waste lithium batteries, in particular to a sodium salt roasting method for recovering metals in positive electrode powders of waste lithium batteries. Background technique [0002] Lithium-ion batteries have been widely used in portable electrical appliances such as mobile phones, notebook computers, and cameras because of their low environmental pollution, no memory effect, and excellent electrochemical performance. They are also one of the power batteries for electric vehicles. The service life of rechargeable and dischargeable lithium-ion batteries as green energy is generally 3-8 years. With the rapid development of the application of lithium batteries, waste lithium-ion batteries have become an important part of solid waste that cannot be ignored. There are many types of lithium-ion batteries, which can generally be classified according to their positive electrode mater...

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Problems solved by technology

Chinese Patent Publication No. CN102368555A, Chinese Patent Publication No. CN103000896A, Chinese Patent Publication No. CN103531795A, Chinese Patent Publication No. CN105206799A, Chinese Patent Publication No. CN105870402A etc. have disclosed various preparation methods of doped metals for lithium battery cathode materials. The recovery and reuse of metals are rarely covered in domestic and foreign patents or literature

Chinese Patent Publication No. CN102162034A, Chinese Patent Publication No. CN103280610A, Chinese Patent Publication No. CN106129519A etc. disclose the acid concentration in the acid leaching lithium battery positive electrode powder all at 3-6mol / L, nevertheless, due to the valence state of doping metal and The position of doping inside and outside the molecule is different, so that the leaching rate is low, resulting in low content of doped metals in the acid leaching solution, poor recovery value, and can only be removed as impurity metals

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