Cobalt carbonate preparation method and superfine cobalt powder preparation method

A technology of ultra-fine cobalt powder and cobalt carbonate, which is applied to the preparation of ultra-fine cobalt powder and cobalt carbonate, can solve the problems of high bulk density of cobalt carbonate, uneven particle size, low production efficiency, etc., and achieve low bulk density. , uniform particle size, high production efficiency

Inactive Publication Date: 2013-02-06
GEM CO LTD +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a method for preparing cobalt carbonate, which solves the technical problems of low production efficiency, high bulk density of cobalt carbonate, and uneven particle size in the prior art; and a method for preparing ultrafine cobalt powder

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  • Cobalt carbonate preparation method and superfine cobalt powder preparation method
  • Cobalt carbonate preparation method and superfine cobalt powder preparation method

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preparation example Construction

[0017] see figure 1 , figure 1 Show a kind of cobalt carbonate preparation method of the embodiment of the present invention, comprise the steps:

[0018] Step S101, preparing cobalt carbonate precipitation (including three steps of precipitation reaction, microporous filtration and hot pure water washing)

[0019] At a temperature of 0-30°C and a pH value of 5.5-8.0, mix the cobalt salt solution with soluble carbonate or soluble bicarbonate, perform microporous filtration after the reaction, collect and wash the filter residue;

[0020] Step S102, negative pressure drying

[0021] Drying the washed filter residue under negative pressure at a temperature of 50-80°C to obtain a cobalt carbonate precursor;

[0022] Step S103, airflow fragmentation

[0023] The cobalt carbonate precursor is subjected to airflow crushing and classification treatment to obtain cobalt carbonate.

[0024] Specifically, in step S101, the solute of the cobalt salt solution is a soluble cobalt salt...

Embodiment 1

[0041] The preparation method of ultrafine cobalt powder in the embodiment of the present invention comprises the following steps:

[0042] At a temperature of 0°C and a pH value of 5.5, mix the cobalt nitrate solution and sodium carbonate in a molar ratio of 1:2, react for 0.5 hours and then filter through micropores, collect the filter residue and wash it with hot pure water for 3 times;

[0043] drying the washed filter residue at a temperature of 50° C. and a pressure of 0 MPa for 8 hours to obtain a cobalt carbonate precursor;

[0044] The cobalt carbonate precursor is subjected to airflow crushing and grading treatment, and the frequency of airflow crushing is 40 Hz / min to obtain cobalt carbonate, the bulk density of cobalt carbonate is 0.26g / cm3, and the average particle size is 1.83 μm;

[0045]The cobalt carbonate was reacted for 2 hours at a temperature of 300°C in a mixed atmosphere composed of hydrogen and nitrogen at a volume ratio of 1:0.1 to obtain a superfine c...

Embodiment 2

[0048] The preparation method of ultrafine cobalt powder in the embodiment of the present invention comprises the following steps:

[0049] At a temperature of 15°C and a pH value of 6.0, mix the cobalt nitrate solution and sodium carbonate in a molar ratio of 1:2.5, react for 2 hours and then filter through micropores, collect the filter residue and wash it with hot pure water for 6 times;

[0050] drying the washed filter residue at a temperature of 60°C and a pressure of -0.1MPa for 12 hours to obtain a cobalt carbonate precursor;

[0051] The cobalt carbonate precursor is subjected to airflow crushing and grading treatment, and the frequency of airflow crushing is 55Hz / min to obtain cobalt carbonate, the bulk density of cobalt carbonate is 0.21g / cm3, and the average particle size is 1.61 μm;

[0052] The cobalt carbonate was reacted for 6 hours at a temperature of 400°C in a mixed atmosphere composed of hydrogen and nitrogen at a volume ratio of 1:1.25 to obtain an ultrafi...

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Abstract

The invention provides a cobalt carbonate preparation method and a superfine cobalt powder preparation method, which are applicable to the technical field of cobalt powder preparation. The cobalt carbonate preparation method comprises the following steps of: mixing a cobalt salt solution and soluble carbonate or soluble hydrocarbonate under a condition with temperature of 0-30 DEG C and pH value of 5.5-8.0; carrying out millipore filtration on an obtained mixture after reaction; collecting and washing filter residues; drying the washed filter residues under a negative pressure condition at 50-80 DEG C, so as to obtain a cobalt carbonate precursor; and carrying out airflow crushing and classification on the cobalt carbonate precursor, so as to obtain cobalt carbonate. The cobalt carbonate preparation method and the superfine cobalt powder preparation method, provided by the invention, have the advantages of mild technical condition, high production benefits, low apparent density of the obtained cobalt carbonate and uniform particle size and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of cobalt powder preparation, and in particular relates to a preparation method of cobalt carbonate and an ultrafine cobalt powder preparation method. Background technique [0002] Cobalt carbonate and cobalt powder are widely used in the field of industrial technology, and cobalt carbonate powder is required to have a lower bulk density and a smaller particle size. At present, the method for preparing cobalt carbonate and cobalt powder has complex steps, harsh preparation conditions, and low production efficiency. Moreover, the prepared cobalt carbonate and cobalt powder are easy to agglomerate and have uneven particle sizes, which cannot meet the needs of industrial production. Contents of the invention [0003] In view of this, the embodiment of the present invention provides a method for preparing cobalt carbonate, which solves the technical problems of low production efficiency, high bulk density of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/06B82Y40/00
Inventor 苏陶贵罗亮亮吴光源王勤闫梨何显达
Owner GEM CO LTD
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