Method for treating lithium nickel manganese cobalt oxide ternary waste

Abstract

The invention discloses a method for treating lithium nickel manganese cobalt oxide ternary waste. The method is as below: dissolving ternary waste with alkali, dissolving amphoteric aluminum in the solution to separate the aluminum from other components, and then reducing the solid after aluminum separation in a reduction furnace; then adding reduced materials to pure water for washing; dissolving lithium oxide in hot pure water to obtain lithium hydroxide, thereby realizing separation of lithium from nickel-cobalt-manganese; controlling addition amount of sulfuric acid and pH value at a final process and an end point to separate highly active metal manganese from nickel and cobalt; pulpifying slag after separation of manganese, conducting electromagnetic separation to obtain electromagnetic separation materials, and then dissolving the electromagnetic separation materials in hydrochloric acid; and introducing chlorine gas into the obtained nickel-cobalt solution at a certain temperature and pressure to oxidize and hydrolyze cobalt ions into trivalent cobalt precipitates, thereby achieving the separation of nickel and cobalt. The method has the advantages of a short process, a small amount of waste water generation and high material recovery rate; and the obtained products are all battery grade, and have high added value.

Description

technical field [0001] The invention relates to a treatment method for nickel-cobalt-lithium-manganese-oxide ternary waste, belonging to the field of waste recycling. Background technique [0002] With the adjustment of national policies and the increase of car companies' demand for cruising range, battery companies have deployed ternary battery business. Nickel-cobalt lithium manganese oxide replaces more than two-thirds of the cobalt in lithium cobalt oxide with relatively cheap nickel and manganese. The cost advantage is very obvious. Compared with other lithium-ion battery cathode materials lithium manganese oxide and lithium iron phosphate, Nickel cobalt lithium manganese oxide material and lithium cobalt oxide are very close in terms of electrochemical performance and processing performance, making nickel cobalt lithium manganese oxide material a new battery material and gradually replacing lithium cobalt oxide, becoming the darling of the new generation of lithium ion...

AI Technical Summary

Problems solved by technology

[0005] The second is a variety of heavy metals (such as cobalt, nickel, etc.) and electrolytes (lithium hexafluorophosphate, etc.) contained in waste lithium-ion batteries. These heavy metals and organic substances will cause great harm to the natural environment and human health;

[0006] The third is that the separators and casings in waste lithium-ion batteries are non-degradable wastes. If they are piled up arbitrarily without effective treatment, they will inevitably bring a lot of solid waste pollution and serious air pollution to the environment.

[0008] For the treatment of nickel-cobalt lithium manganate ternary waste, the conventional process is generally to add sulfuric acid and reducing agent to dissolve, then extract and separate manganese and zinc and other elements in it through P204, and then extract and separate through P507 to obtain nickel salt and cobalt salt, and the raffinate Lithium in the liquid is recovered through precipitation. This process is very long, the investment in equipment is large, the amount of waste water is generated, the recovery rate is low, and because the content of nickel, cobalt and manganese is equivalent, the number of extraction stages is particularly long.

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