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A method for separating magnetic impurities in ultrafine cobalt compound powder

A technology for magnetic impurities and compounds, applied in the field of battery-grade cobalt material preparation, can solve the problems of poor separation of magnetic impurities, increased difficulty in demagnetization, poor stability, etc., and achieves improved demagnetization efficiency, high price, and satisfactory magnetic The effect of impurity index requirements

Active Publication Date: 2019-11-12
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultrafine cobalt compound powder has small particle size, poor fluidity and high viscosity, which makes demagnetization more difficult
The traditional method of removing magnetic impurities is to use a rotary type iron remover or an electromagnetic iron remover to remove the magnetism from dry materials. This method has poor separation effect and poor stability. The average content of magnetic impurities after demagnetization is >200μg / kg, which cannot meet the increasingly stringent Magnetic impurity index requirements for battery-grade cobalt compounds

Method used

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  • A method for separating magnetic impurities in ultrafine cobalt compound powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 840kg (dry basis physical weight) of cobalt hydroxide wet filter cake into the slurrying tank, add pure water 0.42m 3 Add 3.0 kg of ammonium salt to pure water, start stirring, and slurry at 35° C. for 1.0 h to obtain a cobalt hydroxide slurry with a solid content of 67%.

[0026] Pump the obtained cobalt hydroxide slurry into the demagnetization raw material tank, turn on the automatic slurry iron remover and the centrifugal pump at the outlet of the raw material tank successively, and the slurry is pumped through the fluid pipeline iron remover and the automatic slurry iron remover successively. The slurry is circulated to remove magnetic impurities. Operating conditions for slurry removal of magnetic impurities: magnetic field strength of magnetic medium for fluid pipeline iron remover: 9000GS, magnetic field strength of magnetic medium for fully automatic slurry iron remover: 7500GS, cleaning times of magnetic medium for fluid pipeline iron remover: 3 times (cle...

Embodiment 2

[0031] Put 1000kg (dry basis physical weight) of tricobalt tetroxide into the slurry tank, add 0.60m of pure water 3 pure water, start stirring, and slurry at 25°C for 0.5h to obtain a cobalt tetroxide slurry with a solid content of 62.5%.

[0032] Pump the obtained cobalt tetroxide slurry into the demagnetization raw material tank, turn on the automatic slurry iron remover and the centrifugal pump at the outlet of the raw material tank successively, and the slurry passes through the fluid pipeline iron remover and the automatic slurry iron remover successively under pumping Cycle to remove magnetic impurities. Operating conditions for slurry removal of magnetic impurities: magnetic field strength of magnetic medium for fluid pipeline iron remover: 9500GS, magnetic field strength of magnetic medium for fully automatic slurry iron remover: 8000GS, cleaning times of magnetic medium for fluid pipeline iron remover: 3 times (cleaning 1 time per 0.5h operation times), fully automa...

Embodiment 3

[0038] Using cobalt liquid and ammonium bicarbonate solution as raw materials, a cobalt carbonate slurry with a solid content of 8.8% was synthesized in a synthesis kettle under certain conditions.

[0039] The obtained cobalt carbonate slurry is pumped into the demagnetization raw material tank, and the automatic slurry iron remover and the centrifugal pump at the outlet of the raw material tank are turned on successively. Material circulation to remove magnetic impurities. Operating conditions for slurry removal of magnetic impurities: magnetic field strength of magnetic medium for fluid pipeline iron remover: 10000GS, magnetic field strength of magnetic medium for fully automatic slurry iron remover: 7800GS, cleaning times of magnetic medium for fluid pipeline iron remover: 4 times (cleaning 1 time per 0.5h operation times), fully automatic slurry remover magnetic medium backwash times: 8 times (cleaning once every 15 minutes of operation), slurry cycle demagnetization time...

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Abstract

The invention belongs to the technical field of battery grade cobalt material preparation, and particularly relates to a method for separating magnetic impurities in cobalt materials. The method comprises the following concrete steps that a certain solid-liquid ratio of cobalt system compound slurry material obtained by slurrying of pure water or by compounding is sequentially pumped into a flow body pipeline deironing device and a full-automatic slurry material deironing device to conduct slurry material circulation for removing the magnetic impurities; slurry materials after removing the magnetic impurities through the step 1 are filtered and washed and then dried or directly dried to obtain a superfine cobalt system compound coarse powder body; and then the superfine cobalt system compound coarse powder body is input into a rotary-type deironing device for removing the magnetic impurities of dried materials to obtain a superfine cobalt system compound powder body, wherein the content of the magnetic impurities of the superfine cobalt system compound powder body is, by iron, less than 50 [mu]g / kg. According to the method for removing the magnetic impurities, the magnetic impurities in the superfine cobalt system compound powder body can be effectively separated, increasingly stringent index requirements of the magnetic impurities of the battery grade cobalt system compound are met, and the method is efficient, simple, convenient and stable.

Description

technical field [0001] The invention belongs to the technical field of preparation of battery-grade cobalt materials, and in particular relates to a method for separating magnetic impurities in cobalt materials. Background technique [0002] As an important raw material for battery materials, ultra-fine battery-grade cobalt-based compound powders have extremely high requirements for magnetic impurities. The lower the magnetic impurities, the higher the electrical performance and safety performance of the battery. During the production process of cobalt-based compounds, magnetic impurities are mixed in after materials pass through synthetic kettles, solid-liquid separation equipment, drying equipment, pipelines and other metal equipment. Excessive magnetic impurities will reduce the electrical performance and safety performance of the battery. Therefore, it is necessary to mix cobalt-based compounds Only when the compound magnetic impurities are reduced to a certain extent ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/10B03C1/02B08B3/02H01M4/52
CPCB03C1/02B03C1/10B08B3/02H01M4/52Y02E60/10
Inventor 曾彦张书金惠升方华雄
Owner ZHEJIANG HUAYOU COBALT
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