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A kind of leaching method and leaching system of valuable metals in waste lithium battery cathode material

A technology for waste lithium batteries and positive electrode materials, which is applied in the field of leaching method and leaching system of valuable metals in the positive electrode materials of waste lithium batteries, can solve the problems of environmental pollution of the treatment method, achieve high-efficiency leaching, high leaching rate, and good industrial application foreground effect

Active Publication Date: 2022-03-08
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a leaching method and leaching system for valuable metals in the positive electrode materials of waste lithium batteries, aiming at solving the problem of environmental pollution in the existing treatment methods of waste lithium-ion batteries

Method used

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  • A kind of leaching method and leaching system of valuable metals in waste lithium battery cathode material
  • A kind of leaching method and leaching system of valuable metals in waste lithium battery cathode material
  • A kind of leaching method and leaching system of valuable metals in waste lithium battery cathode material

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Effect test

Embodiment 1

[0071] Embodiment 1: the leaching of lithium, nickel, cobalt, manganese in waste and old ternary lithium ion battery

[0072] After the waste ternary lithium ions are pretreated by discharging and crushing, the positive electrode material is separated. The Li content in the positive electrode material is 3.00%, the Mn content is 32.29%, the Co content is 2.38%, and the Ni content is 3.59%, mainly LiMn 2 o 4 and NiCo 2 o 4 form, such as figure 1 shown.

[0073] Experimental conditions: the concentration of malonic acid is 1.5mol / L, the solid-to-liquid ratio is 40g / L, the mass of glucose is 0.8 times the mass of the positive electrode powder, and the reaction time is 40min.

[0074] Configure 250mL aqueous solution of malonic acid and glucose in a beaker, add 10g of positive electrode powder, and change the leaching temperature conditions (the leaching temperature is set to 60°C, 70°C, 80°C, 90°C, 100°C, 110°C respectively), according to The leaching reaction was carried o...

Embodiment 2

[0075] Embodiment 2: the leaching of lithium, nickel, cobalt, manganese in waste and old ternary lithium ion battery

[0076] After the waste ternary lithium ions are pretreated by discharging and crushing, the positive electrode material is separated. The Li content in the positive electrode material is 3.00%, the Mn content is 32.29%, the Co content is 2.38%, and the Ni content is 3.59%.

[0077] Experimental conditions: the concentration of malonic acid is 1.5mol / L, the mass of glucose is 0.8 times the mass of the positive electrode powder, the leaching reaction time is 40min, and the leaching temperature is 110°C.

[0078] Configure 250mL aqueous solution of malonic acid and glucose in a beaker, add 10g of positive electrode powder, by changing the solid-liquid ratio (the solid-liquid ratio is set to 20g / L, 30g / L, 40g / L, 50g / L, 60g / L respectively ) conditions, and carry out the leaching reaction according to the experimental conditions, the leaching rate results of lithiu...

Embodiment 3

[0079] Embodiment 3: the leaching of lithium, nickel, cobalt, manganese in waste and old ternary lithium ion battery

[0080] After the waste ternary lithium ions are pretreated by discharging and crushing, the positive electrode material is separated. The Li content in the positive electrode material is 3.50%, the Mn content is 6.10%, the Co content is 16.12%, and the Ni content is 7.08%, mainly LiCoO 2 , Li 0.65 mn 1.08 o 2 and exist in the form, such as Figure 4 shown.

[0081] Experimental conditions: the solid-to-liquid ratio is 20g / L, the mass of glucose is 0.7 times the mass of the positive electrode powder, the leaching reaction time is 40min, and the leaching reaction temperature is 110 degrees Celsius.

[0082] Configure 250mL aqueous solution of malonic acid and glucose in a beaker, add 5g of positive electrode powder, by changing the concentration of malonic acid (the concentration of malonic acid is set to 1.20mol / L, 1.25mol / L, 1.30mol / L, 1.35mol / L, 1.40mo...

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Abstract

The invention discloses a method and a system for leaching valuable metals in positive electrode materials of waste lithium batteries. Wherein, the method for leaching valuable metals in the positive electrode material of the waste lithium battery includes: discharging and crushing the waste lithium battery to obtain positive electrode powder; mixing an aqueous solution of malonic acid and glucose with the positive electrode powder and then leaching to obtain a leachate. The invention uses malonate-glucose mixed solution as the leaching system, and the leaching system can realize high-efficiency leaching of lithium, nickel, cobalt and manganese, and the leaching rate can reach more than 99%. The leaching method of the invention is green and environment-friendly without secondary pollution, the leaching process is safe and controllable, the leaching rate is high, and the method has good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of resource recovery of waste batteries, in particular to a method and system for leaching valuable metals in anode materials of waste lithium batteries. Background technique [0002] Lithium-ion batteries have long service life, good cycle performance, high energy density and do not contain heavy metals such as cadmium, lead and mercury, and have excellent electrochemical performance such as easy charging and maintenance. Therefore, lithium-ion batteries are widely used in consumer electronics, electric vehicles and energy storage fields. Has been widely used. [0003] Waste lithium-ion batteries are extremely resource-intensive. The content of metals such as lithium, cobalt, nickel and manganese in waste lithium-ion batteries is much higher than that of ordinary ores. In terms of weight percentage, its valuable components include 5-7% Li, 5-20% Co, 5-20% 10% Mn and 5-7% Ni, etc. Therefore, the recycling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12C22B23/00C22B47/00
CPCC22B7/007C22B26/12C22B23/0415C22B47/00H01M10/54Y02W30/84Y02P10/20
Inventor 沈庆峰崔鹏媛俞小花冯天意张文之王露林艳
Owner KUNMING UNIV OF SCI & TECH
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