Method for enhancing metal recovery of waste lithium ion battery

A lithium-ion battery and waste technology, which is applied in the field of strengthening the metal recovery of waste lithium-ion batteries, can solve the problems of low leaching efficiency, secondary pollution, a large amount of waste liquid, etc., so as to improve the leaching efficiency, reduce the large acid consumption, and solve the problem of high cost. Effect

Pending Publication Date: 2017-08-22
SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0005] In view of the deficiencies in the existing waste battery recycling technology, especially in order to avoid the existing wet leaching problems such as low efficiency, long pr

Method used

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  • Method for enhancing metal recovery of waste lithium ion battery

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Effect test

Embodiment 1

[0040] The waste lithium-ion battery is broken into pieces of 1~20mm × 1~20mm, calcined at 600 ° C for 2 hours, and the positive electrode powder is obtained after sorting. 100g of positive electrode powder was added to the leaching solution of sulfuric acid and citric acid containing a reducing agent, wherein the concentration of sulfuric acid was 3 mol / L, the addition ratio of citric acid was 30 vol.%, the reducing agent was sodium sulfite, and the mass concentration of the reducing agent was 2%. The ratio is 150g / L. Add ZrO with a particle size of 2 mm to the leaching mixture 2 pellets, ZrO 2The mass ratio of pellets to cathode powder was 3:1, and high-speed stirring ball milling was carried out at a temperature of 75 °C, wherein the stirring speed was controlled at 500 rpm, and the leaching time was 15 min. The leaching solution containing cobalt, nickel and lithium metal ions was obtained, and the cobalt leaching rate was >98%, the nickel leaching rate was >99%, and the...

Embodiment 2

[0042] The waste lithium-ion battery is broken into pieces of 1~20mm×1~20mm, roasted at 800°C for 2h, and the positive electrode powder is obtained after sorting. 100g of positive electrode powder was added to the mixed acid leaching solution of nitric acid and trichloroacetic acid containing a reducing agent, wherein the acid concentration was 3 mol / L, the addition amount of trichloroacetic acid was 25 vol.%, the reducing agent was hydrogen peroxide, and the reducing agent mass concentration is 2%, and the leaching solid-liquid ratio is 250g / L. Add MgO pellets with a particle size of 2 mm to the leaching mixture, the mass ratio of MgO pellets to positive electrode powder is 7:1, and perform high-speed stirring at a temperature of 75°C, wherein the stirring speed is controlled at 500rpm, and the leaching time is 20min . A leaching solution containing cobalt, nickel and lithium metal ions was obtained, and the cobalt leaching rate was >98%, the nickel leaching rate was >99%, a...

Embodiment 3

[0044] The waste lithium-ion battery is broken into pieces of 1~20mm×1~20mm, roasted at 800°C for 2h, and the positive electrode powder is obtained after sorting. 100 g of positive electrode powder was added to the hydrochloric acid-sulfuric acid mixed acid leaching solution containing a reducing agent, wherein the acid concentration was 3 mol / L, the reducing agent was hydrogen peroxide, the reducing agent mass concentration was 2%, and the leaching solid-liquid ratio was 300 g / L. Add Al with a particle size of 3 mm to the leaching mixture 2 O 3 small ball, Al 2 O 3 The mass ratio of pellets to positive electrode powder was 5:1, and high-speed stirring was performed at a temperature of 75 °C, wherein the stirring speed was controlled at 500 rpm, and the leaching time was 20 min. The leaching solution containing cobalt, nickel and lithium metal ions was obtained, and the cobalt leaching rate was >98%, the nickel leaching rate was >99%, and the lithium leaching rate was >99%....

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Abstract

The invention provides a method for enhancing metal recovery of a waste lithium ion battery. The method for enhancing the metal recovery of the waste lithium ion battery comprises the steps that firstly, the waste lithium ion battery is calcinated, smashed and sorted so that positive electrode powder materials can be obtained; and then, wet leaching is conducted on the positive electrode powder materials, and mechanical and chemical activation is achieved through a high-energy ball mill in the leaching process, wherein mechanical and chemical activation is executed during leaching, so that the obtained leach liquor can be further used for recovery of valuable metal elements. By the adoption of the method for enhancing the metal recovery of the waste lithium ion battery, the procedure is simple, the operability is high, under the cooperative action of mechanical force and chemical activation, the leaching time of the positive electrode powder material can be greatly shortened, the leaching rate of the metal elements is improved, cost is reduced, and the market prospect is good.

Description

technical field [0001] The invention belongs to the technical field of secondary resource recovery and utilization and circular economy, and in particular relates to a method for strengthening metal recovery of waste lithium ion batteries. Background technique [0002] With the development of new energy vehicles, the demand for materials for lithium-ion batteries has grown significantly. Reasonable recycling and utilization of valuable resources of waste batteries will greatly alleviate the contradiction between the tight supply of metal ore resources in my country and the huge demand in emerging fields such as new energy vehicles, reduce the consumption of natural minerals, and promote sustainable economic and environmental development. [0003] Researchers at home and abroad have carried out a lot of research and discussion on the treatment and recycling of waste lithium-ion batteries. The combination of hydrometallurgy, pyrometallurgy, and hydrothermal method has the char...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B26/12H01M10/54
CPCC22B7/007C22B23/0415C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 王雪
Owner SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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