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Method for carrying out recovery treatment on waste saggar in lithium cobaltate positive electrode material preparation process

A positive electrode material and preparation process technology, which is applied in the field of recycling waste saggers during the preparation of lithium cobaltate positive electrode materials, can solve the problems of comprehensive utilization of waste saggers and difficulty in recycling, etc., and achieve reduced raw material consumption and low price , cost-saving effect

Active Publication Date: 2019-06-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the alkali metal reaction on the surface of the waste saggers in the production process of lithium cobaltate cathode materials, it is difficult to directly return them to use. At present, there are no relevant literature reports on the comprehensive utilization of waste saggers in the new energy industry.

Method used

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  • Method for carrying out recovery treatment on waste saggar in lithium cobaltate positive electrode material preparation process
  • Method for carrying out recovery treatment on waste saggar in lithium cobaltate positive electrode material preparation process
  • Method for carrying out recovery treatment on waste saggar in lithium cobaltate positive electrode material preparation process

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Effect test

Embodiment 1

[0154] This embodiment provides a method for recycling waste saggers during the preparation of lithium cobaltate cathode materials, the specific method is:

[0155] (1) Immerse the discarded sagger described in Table 1 in a leaching tank with a molar concentration of 2mol / L of 10L sulfuric acid (obtained by adding acid) for reaction, add 100mL of hydrogen peroxide (additive) to carry out leaching reaction at 30°C, and leaching for 10h Finally, the sagger was taken out, and the purified sagger was put into clear water for soaking. After soaking for 4 hours, the sagger was washed with clear water and used for crushing and screening to prepare refractory powder.

[0156] (2) After repeated leaching of 10 discarded saggers, the leaching solution is firstly separated by filtration, and the filter residue is returned to the leaching tank for deep leaching. After washing, it is discharged as solid waste, and the filtered filtrate is added to the digested / slurried calcium hydroxide. A...

Embodiment 2

[0170] This embodiment provides a method for recycling waste saggers during the preparation of lithium cobaltate cathode materials, the specific method is:

[0171] (1) Immerse the waste sagger used in Example 1 into a leaching tank of 10L sulfuric acid with a molar concentration of 3mol / L for reaction, add 500mL of hydrogen peroxide and carry out leaching reaction at 25°C, take out the sagger after leaching for 10h, and purify the sagger The bowl is soaked in clean water, soaked for 6 hours, rinsed with clean water, and then the sagger is used for crushing and screening to prepare refractory powder.

[0172] (2) After repeated leaching of 20 discarded saggers, the leaching solution was first separated by filtration, and the filter residue was returned to the leaching tank for deep leaching. After washing, it was discharged as solid waste. The filtered filtrate was slowly added to calcium oxide for neutralization, and the pH was controlled at an end point of 3.0, reacted for 3...

Embodiment 3

[0182] This embodiment provides a method for recycling waste saggers during the preparation of lithium cobaltate cathode materials, the specific method is:

[0183] (1) The discarded sagger used in Example 1 is immersed in a leaching tank of 10L sulfuric acid (obtained by adding acid) with a molar concentration of 2.5mol / L for reaction, and 500mL of hydrogen peroxide (additive) is added to carry out leaching reaction at normal temperature, and leaching for 10h Finally, the sagger was taken out, and the purified sagger was put into clear water for soaking. After soaking for 6 hours, the sagger was washed with clear water and used for crushing and screening to prepare refractory powder.

[0184] (2) After repeated leaching of 15 discarded saggers, the leaching solution is firstly separated by filtration, the filter residue is returned to the leaching tank for deep leaching, and after washing is completed, it is discharged as solid waste. And, control the pH end point to be 2.5, fi...

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Abstract

The invention provides a method for carrying out recovery treatment on a waste saggar in a lithium cobaltate positive electrode material preparation process, wherein the waste saggar contains silicon,aluminum and magnesium impurities. The method comprises: 1) mixing a waste saggar, an acid and an additive, carrying out a leaching reaction, and separating to obtain a purified saggar and a leachate; 2) adjusting the pH value of the leachate to 2-4, and carrying out solid-liquid separating to obtain solid residue and a separated liquid; 3) adjusting the pH value of the separated liquid to 4.5-5.5, and carrying out solid-liquid separating to obtain solid residue and an aluminum removed liquid; 4) adjusting the pH value of the aluminum removed liquid to more than or equal to 8, and carrying out solid-liquid separating to obtain a cobalt-containing substance and a cobalt precipitation liquid; 5) adjusting the pH value of the cobalt precipitation liquid to more than or equal to 11, and carrying out solid-liquid separating to obtain solid residue and a magnesium removed liquid; and 6) adding a precipitating agent to the magnesium removed liquid, and carrying out solid-liquid separation toobtain a lithium-containing substance and a lithium precipitation liquid. According to the present invention, with the method, the recovery and utilization of cobalt and lithium in the waste saggar in the lithium cobaltate positive electrode material preparation process is achieved, the waste saggar is purified, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for recycling solid waste from the new energy industry, in particular to a method for recycling waste saggers during the preparation of lithium cobalt oxide positive electrode materials. Background technique [0002] In recent years, with the strong support of national policies and the rapid advancement of the current energy and information industries, the new energy industry represented by electric vehicles has developed rapidly, and the lithium battery industry has also developed rapidly, which will greatly drive the upstream and downstream industries. of rapid development. [0003] As an important battery cathode material, lithium cobalt oxide cathode material is widely used in the field of new energy, and due to the upgrade of cathode material research and development. In the firing process of lithium cobaltate powder, mullite cordierite sagger is usually used as a container for high-temperature reaction. After r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24C01D5/00C01D15/08C01F5/08C01F11/02C01F11/46C01G51/04C07C51/41C07C55/07
Inventor 孙振华李少鹏李会泉高奥雷
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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