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Preparation method of high-purity lithium carbonate with adjusted particle size, particle size distribution and shape

A particle size distribution, lithium carbonate technology, applied in chemical instruments and methods, lithium carbonate;/acid carbonate, lithium sulfate/sulfite, etc., can solve the problems of increasing production costs and achieve high purity Effect

Active Publication Date: 2021-04-02
KNU IND COOPERATION FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The present invention relates to the preparation method of the high-purity lithium carbonate that adjusts particle size, particle size distribution and shape, and this method uses lithium carbonate crystal seed (seed) in the process of purifying lithium carbonate, to improve due to the additional post-processing that does not adjust particle size The problem of increasing production costs due to processing technology

Method used

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  • Preparation method of high-purity lithium carbonate with adjusted particle size, particle size distribution and shape
  • Preparation method of high-purity lithium carbonate with adjusted particle size, particle size distribution and shape
  • Preparation method of high-purity lithium carbonate with adjusted particle size, particle size distribution and shape

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Embodiment 1

[0081]Example 1) Preparation from the waste lithium secondary battery waste liquid and purified lithium phosphate

[0082]First investigate the structural substances of the bag waste lithium secondary battery. The survey was confirmed that the total weight of a battery was 35.46g, and 0.51 g (1.4%), 0.41 g (1.1%), a circuit board 1.57g (4.4%), battery 32.98g (93%) constitute. The powder layer coated on the surface of the battery is 1.98 g (5.6%), and its main component is Fe. The battery case is composed of aluminum, with a weight of 7.72 g (21.8%), which is drastically corroded while being immersed in salt water, and alumina is formed. The inside of the battery is composed of a plastic diaphragm, an aluminum sheet (positive electrode), a positive electrode active material, a copper sheet (negative electrode), and a negative active material. Its respective weight is 1.05 g (2.96%), aluminum sheet 3.26 g (9.2%), a positive electrode active material 10.32 g (29.1%), copper sheet 2.76 g (...

Embodiment 1-1

[0083]Example 1-1) Opported organics of waste lithium secondary battery waste liquid

[0084]The lithium waste fluid produced in the process of recovered cobalt and nickel using 1 ton of recovery by the above-mentioned waste lithium secondary battery. The result of the pH of the above lithium waste liquid and the result of the substance, pH of 5 to 7, and contain lithium ions (Li+2990ppm, sodium ions (NA+12030ppm, sulfate ions (SO42-50500 ppm and organic matter 130ppm. In order to remove the organic matter contained in the above lithium waste liquid, the organic matter is removed by activated carbon. When the activated carbon is removed, the above-mentioned lithium waste liquid is attached to the tower by activated carbon.

Embodiment 1-2

[0085]Example 1-2) Preparation of lithium phosphate from the waste lithium secondary battery

[0086]Based on the experimental example of the present invention, the most suitable condition for preparing lithium phosphate can be obtained. With 1: 2 equivalents, lithium ions and phosphate ions were added to the waste lithium secondary battery waste, and NaOH was used as the pH adjusting agent to maintain pH 13 or more, and the reaction temperature was 70 ° C, the reaction time was 1 hour. When the lithium phosphate is preciphected with the above reaction conditions, the particle size of 5 to 100 μm can be prepared, and the specific surface area is increased by three spherical shapes, and the reactivity is excellent in phosphate.

[0087]A method of preparing lithium phosphate from waste lithium secondary battery waste is described in detail in the prior art of the inventors (Korea Authorized Patent 10-1604954).

[0088]For the above prior art, the method of preparation of lithium lithium phosp...

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Abstract

The effect of the preparation method of high-purity lithium carbonate with adjusted particle size, particle size distribution and shape related to the present invention is that more than 85% of the crude lithium carbonate used as raw materials is recovered into a particle size, particle size distribution and shape adjusted to 2 to 8 μm. form of lithium carbonate. The lithium carbonate whose particle size, particle size distribution and shape are adjusted through the present invention is lithium carbonate with a purity of more than 99.5%, and its particle size is 4 to 10 μm, so the specific surface area is large and the reaction performance is excellent. The advantage of the preparation method of the present invention is, after dissolving lithium carbonate selectively, use the high-purity lithium carbonate dissolving solution and the high-purity lithium carbonate seed crystal that remove coexisting sulfate ion in the form of barium sulfate, so that carbonate is precipitated on the surface of the seed crystal. Lithium, so that high-purity lithium carbonate can be prepared. And the precipitated lithium carbonate is exposed to the dissolving environment again to remove particles with unstable surfaces and sharp corners, so that lithium carbonate with uniform particle size and excellent fluidity can be obtained.

Description

Technical field[0001]The present invention relates to the preparation method of adjusting high purity carbonate in the shape, particle size distribution and shape.Background technique[0002]South Korea is the main producer of lithium secondary batteries, and the production capacity of positive active substances for secondary batteries accounts for 40% of the world's production capacity. However, the actual situation is to produce lithium carbonate for the production of the above positive electrode active substances per year. Recycling processes using waste lithium secondary batteries are divided into dry process and wet processes. The above dry process is the advantage of putting the dried lithium secondary battery to a high temperature furnace to recover the metal. However, the above dry process has problems with high initial investment, low metal recovery, high gas treatment cost. The above wet process is a process of extracting metal using solvent extraction by dissolving the wast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08C01D15/06C01B25/30
CPCC01P2004/61C01D15/08C01P2004/03C01P2006/80C01F11/462C01B25/30C01D15/06C01P2004/51C01P2004/11
Inventor 宋泳俊
Owner KNU IND COOPERATION FOUND