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Method for separating and recovering valuable metals in roasted product of lithium ion battery

A technology for lithium-ion batteries and roasted products, which is applied in the direction of improving process efficiency, etc., can solve the problems of low leaching rate of reduced roasted products, achieve the effects of improving leaching rate and recovery rate, facilitating industrialization, and increasing leaching rate

Inactive Publication Date: 2020-11-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention realizes the efficient separation of valuable metals in lithium-ion batteries, uses the mechanical effect and cavitation effect of ultrasonic waves to solve the problem of low leaching rate of reduced roasted products, and greatly improves the leaching rate of lithium

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  • Method for separating and recovering valuable metals in roasted product of lithium ion battery
  • Method for separating and recovering valuable metals in roasted product of lithium ion battery

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Effect test

Embodiment 1

[0029] Embodiment 1: A method for separating and reclaiming valuable metals in the calcined product of lithium-ion batteries (see figure 2 ),Specific steps are as follows:

[0030] (1) Soak the waste lithium-ion battery (nickel-cobalt-lithium-manganese-oxide battery) in ferrous sulfate solution for 12 hours, and perform deep discharge. The concentration of ferrous sulfate is 1.5mol / L. Disassemble and strip the discharged lithium-ion battery to obtain positive electrode material (nickel cobalt lithium manganate material) and negative electrode material (graphite material);

[0031] (2) Nickel cobalt lithium manganate material and graphite material are mixed ball milled, dried, and sieved to obtain a mixed material; wherein the mass ratio of the positive electrode material to the negative electrode material is 3:1 when mixed, and the sieve aperture when sieved is 0.074 mm;

[0032] (3) The mixed material is heated to 600°C in an inert gas atmosphere and kept at a temperature ...

Embodiment 2

[0037] Embodiment 2: a method for separating and reclaiming valuable metals in the roasted product of lithium-ion batteries (see figure 2 ),Specific steps are as follows:

[0038](1) Soak the waste lithium-ion battery (lithium cobaltate battery) in the ferrous sulfate solution for 10 hours, and perform deep discharge. The concentration of ferrous sulfate is 2mol / L. Disassemble and peel off the discharged lithium-ion battery to obtain positive electrode material (lithium cobalt oxide material) and negative electrode material (graphite material);

[0039] (2) The lithium cobaltate material and the graphite material are mixed and ball milled, dried, and sieved to obtain a mixed material; wherein the mass ratio of the positive electrode material to the negative electrode material is 5:1 during mixing, and the sieve aperture during sieving is 0.046mm;

[0040] (3) The mixed material is heated to 750°C in an inert gas atmosphere and kept at a temperature of 40 minutes. After the h...

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Abstract

The invention relates to a method for separating and recovering valuable metals in a roasted product of a lithium ion battery. The method for separating and recovering the valuable metals in the roasted product of the lithium ion battery comprises the following steps of mixing and ball-milling a stripped positive electrode material and a stripped negative electrode material of the lithium battery;after an obtained ball-milled product is screened, carrying out reduction roasting on the screened product in an inert gas atmosphere; cooling the reduction roasting product to room temperature underan oxygen-free condition to obtain a roasted product; carrying out sectional ultrasonic-assisted low-temperature water leaching on the roasted product; carrying out magnetic separation and solid-liquid separation on a solution after the sectional leaching is finished to obtain magnetic substances (nickel, cobalt and the like), filtrate and filter residues (manganese monoxide and the like); and carrying out microwave flash evaporation treatment on the filtrate to obtain lithium carbonate crystals. According to the method for separating and recovering the valuable metals in the roasted productof the lithium ion battery, efficient separation of the valuable metals in the lithium ion battery is realized, the problem of low leaching rate of the reduction roasting products is solved by utilizing the mechanical effect and the cavitation effect of ultrasonic waves, and the leaching rate of lithium is greatly increased.

Description

technical field [0001] The invention relates to a method for separating and recovering valuable metals in roasted products of lithium-ion batteries, and belongs to the technical field of recovery of waste lithium-ion batteries. Background technique [0002] As one of the representatives of new energy sources, lithium-ion batteries have received great attention in recent years. The encouragement of policies and breakthroughs in technology have made lithium-ion batteries widely used. With the continuous expansion of the industrial scale of lithium-ion batteries, a large number of lithium-ion batteries have entered people's lives, and a large number of waste lithium-ion batteries have put forward new requirements for the solid waste recycling industry. As the most valuable part of lithium-ion batteries, the positive electrode material has attracted people's attention. It contains rare metal lithium and valuable metals such as nickel, cobalt, and manganese. Therefore, efficient ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B23/00C22B26/12
CPCC22B7/006C22B1/02C22B23/0407C22B26/12Y02P10/20
Inventor 孙晓飞赵鋆泽周云
Owner KUNMING UNIV OF SCI & TECH
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