A multi-stage calcination device for positive electrode materials

Abstract

The invention is applicable to the field of preparation of battery material raw materials, and provides a multi-section calcining device for a positive electrode material. A conveying chamber, a calcining chamber and a cooling chamber which are sequentially arranged from top to bottom, the calcining chamber is provided with a plurality of layers, the temperature can be gradually increased from topto bottom, multi-section high-temperature calcination can be carried out on the positive electrode material conveyed by the conveying chamber, after calcination is completed, the positive electrode material enters the cooling chamber to be cooled, the atmosphere required by calcination of each calcining chamber is introduced from the air inlet and the air outlet of each calcining chamber, the positive pole material multi-section calcining device is utilized, the pushing mechanisms of the left column reversing table and the right column reversing table of the positive pole material multi-section calcining device are matched with the heating wheel roll to realize the automatic movement of the positive pole material, the calcining process is closed, the safety efficiency is high, and meanwhile, the temperature of the calcining chamber of each layer is gradually increased from top to bottom, the principle of hot air diffusion is well utilized, and part of heat enters the conveying chamberand can play a role in preheating.

Description

technical field [0001] The invention belongs to the field of battery material raw material preparation, and in particular relates to a multi-stage calcination device for positive electrode materials. Background technique [0002] The positive electrode material in lithium-ion batteries is mainly lithium cobalt oxide, and the key material for preparing lithium cobalt oxide is tricobalt tetroxide. and service life etc. have a significant impact. There are strict requirements on the chemical composition of cobalt tetroxide used in batteries. The more economical and practical method for preparing cobalt tetroxide in the prior art is the calcining thermal decomposition method, that is, cobalt salts such as cobalt carbonate, cobalt hydroxide or cobalt oxalate are processed under high temperature for many times. The temperature and atmosphere of secondary calcination can be controlled to obtain cobalt tetroxide with uniform particle size and high bulk density. The equipment in th...

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Problems solved by technology

[0003] In view of the above problems, the purpose of the present invention is to provide a multi-stage calcination device for positive electrode materials, aiming to solve the problems that the existing positive electrode material calcination equipment does not have continuous multi-stage calcination capability, and the atmosphere and temperature control system is not perfect.

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