A continuous acid leaching system and method using aeration to control reaction temperature

Abstract

The invention discloses a continuous acid leaching system and method using aeration to control reaction temperature, including slurry preparation, primary acid leaching, secondary acid leaching, high acid leaching and pressure filtration; wherein the slurry is nickel-cobalt leaching Lithium manganate powder, water and acid solution mixture; the primary acid leaching is carried out in a primary acid leaching reaction kettle, and by adding sulfuric acid and hydrogen peroxide, acid leaching nickel cobalt manganese lithium; the secondary acid leaching is carried out in a secondary acid leaching The leaching reaction kettle is carried out, and the nickel, cobalt, manganese and lithium are leached by acid by adding sulfuric acid and hydrogen peroxide. The method proposed by the invention can significantly increase the production capacity under the condition of ensuring the acid leaching rate, and also reduces the usage of soda ash and reduces the burden of subsequent treatment. Under the same equipment, the output of the continuous acid leaching method of the invention is the intermittent acid leaching method. 2.5 times or more; the leaching efficiency in the continuous acid leaching process of the present invention is more than 90%.

Description

technical field [0001] The invention belongs to the field of recycling and utilization of ternary lithium batteries, and in particular relates to a continuous acid leaching system and method using aeration to control reaction temperature. Background technique [0002] With the development of electric vehicles, more and more ternary lithium batteries will be scrapped. The ternary cathode materials from these scrapped batteries are harmlessly crushed and sorted, and the ternary cathode materials from the production process are scrapped, and the recycling process needs to go through acid leaching, and acid leaching nickel-cobalt-manganese-lithium metal salt solution. [0003] Nickel-cobalt-manganese salts are the main raw materials for the production of ternary precursors, and ternary precursors are the main production raw materials for ternary lithium batteries. The acid leaching of nickel, cobalt, manganese and lithium generally adopts the process of sulfuric acid + hydrogen...

AI Technical Summary

Problems solved by technology

The rise of liquid temperature leads to the decomposition of hydrogen peroxide, which releases a large amount of heat. This chain reaction may cause the reactor to leak, stagnate production, and even cause safety and environmental accidents.

[0006] At the same time, the acid leaching of traditional ternary cathode materials generally adopts sulfuric acid + hydrogen peroxide acid leaching, and the process usually uses batch reactors. The acid leaching process is accompanied by a large amount of heat release, which is likely to cause temperature rise. The temperature of the acid leaching liquid can reach above 90°C. If the temperature is too high, the hydrogen peroxide will be decomposed and wasted. Secondly, the next feeding can only be carried out after the last acid leaching is completed and the hydraulic pressure of the material in the reactor is empty. Equipment production efficiency is low

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