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Leaching method for anode and cathode mixed materials of waste LiCoxNiyMnzO2 battery

A technology of nickel-cobalt lithium manganate and mixed materials is applied in the field of leaching of positive and negative electrode mixed materials of nickel-cobalt lithium manganate waste batteries, which can solve the problems of large nitrogen oxides, pollute the environment, large consumption of nitric acid, etc. Nitric acid consumption, obvious economic and environmental benefits, and the effect of saving pollution control costs

Inactive Publication Date: 2009-11-25
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The consumption of nitric acid in the nitric acid leaching method is large, and a large amount of nitrogen oxides will be produced, polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Add 100g of nickel-cobalt lithium manganate waste battery positive and negative electrode mixed material (containing 14.5% nickel, 20.3% cobalt, 17.5% lithium, 2.2% aluminum, 2.5% copper, 12.9% manganese) into a stainless steel with a volume of 2L In the autoclave, add 1800ml of 3.0mol / L nitric acid, pass through industrial pure oxygen of 0.2MPa, stir at 40-50°C (stirring speed 80r / min) for leaching for 2.5 hours, and carry out liquid-solid separation after leaching to obtain 1700ml Leaching solution (excluding leaching slag washing water). The reaction tail gas is about 600ml (converted into a volume with an absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 6.3mg / m 3 . The leaching rates of nickel, cobalt and lithium are 99.2%, 99.4% and 99.6% respectively (calculated according to the nickel, cobalt and lithium entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0049] Example 2: Add 500g of nickel-cobalt lithium manganate waste battery positive and negative mixed materials (containing 14.5% nickel, 20.3% cobalt, 17.5% lithium, 2.2% aluminum, 2.5% copper, 12.9% manganese) into a stainless steel with a volume of 10L In the autoclave, add 6.8L of 4.0mol / L nitric acid, pass through industrial pure oxygen of 0.1MPa, stir at 50-60°C (stirring speed 80r / min) for leaching for 2 hours, carry out liquid-solid separation after leaching, and obtain 6.5L of leaching solution (excluding leaching slag washing water), about 6.4L of reaction tail gas (converted into a volume with an absolute pressure of 0.1MPa), and a nitrogen oxide concentration of 8.1mg / m 3 . The leaching rates of nickel, cobalt and lithium are respectively 99.1%, 99.3% and 99.4% (calculated according to the nickel, cobalt and lithium entering the leaching solution and the leaching slag washing solution).

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Abstract

A leaching method for the anode and cathode mixed materials of a waste LiCoxNiyMnzO2 battery provided by the invention comprises the following steps: putting the anode and cathode mixed materials separated from the waste LiCoxNiyMnzO2 battery into a pressure-resistant and nitric acid resistant container, and then sealing the container and pumping nitric acid into the container; leaching the anode and cathode mixed materials of the waste LiCoxNiyMnzO2 battery by adding industrial pure oxygen. The leaching temperature is 20-100 DEG C; the leaching pressure is 0.05-0.5MPa; the initial concentration of the leached nitric acid is 1-6mol / L; the leaching time is 1-4h; the leaching process needs stirring; and the stirring speed is 30-100r / min. The adding amount of nitric acid is 101-130% of the theoretical quantity of the nitric acid consuming by leaching all the metal out from the anode and cathode mixed materials added in a reaction vessel.

Description

technical field [0001] The invention relates to a method for leaching the positive and negative electrode mixed materials of nickel-cobalt lithium manganate waste battery. Background technique [0002] Nickel-cobalt-lithium manganese oxide batteries (batteries whose positive electrode materials contain nickel, cobalt, manganese, and lithium as the main metal elements) are a new type of battery, and a large amount of waste batteries will be produced after the battery is scrapped. Because this type of battery contains a large amount of heavy metals, if it is discarded into the environment, it will cause great direct and potential harm to the environment. Nickel-cobalt lithium manganese oxide battery positive and negative mixed materials are mainly nickel, cobalt, lithium, copper, aluminum and manganese, of which the total content of nickel, cobalt and lithium is as high as 50%, which is very valuable for recycling. At present, the processes for recovering nickel and cobalt fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B23/00C22B26/12
CPCY02P10/20
Inventor 龙炳清魏涛龙怡孙彦君舒曼曾伟
Owner SICHUAN NORMAL UNIVERSITY
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