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Method for preparing superfine spherical cobalt powder

A spherical and cobalt powder technology, applied in the field of preparation of ultra-fine spherical cobalt powder, can solve problems such as large consumption, and achieve the effects of high production efficiency, high efficiency and reduced product cost

Active Publication Date: 2009-03-04
ZHEJIANG HUAYOU COBALT
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0011] The patent "precipitation-reduction method for preparing nano-cobalt powder" (publication number: CN1686650) mentioned that NaOH or KOH was used as precipitant, but the intermediate product Co(OH) 2 It is colloidal, and in the process of precipitation, it is easy to bring in impurity ions such as Na and K, and it needs to consume a lot of water to wash

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  • Method for preparing superfine spherical cobalt powder
  • Method for preparing superfine spherical cobalt powder
  • Method for preparing superfine spherical cobalt powder

Examples

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Embodiment 1

[0030] Embodiment 1, with reference to attached figure 1 , 2 .

[0031] Using cobalt-containing ore as raw material, after leaching and purification, a high-purity cobalt-containing cobalt chloride solution of 60-160g / L is obtained, and polyvinylpyrrolidone (PVP) is added to the above-mentioned cobalt solution according to 0.05-5% of the cobalt mass. ), polyvinyl alcohol (PVA) or two in any proportion, as a homogeneous cobalt salt solution; ammonium bicarbonate is used as a precipitating agent, which is dissolved and filtered to form an 80-200g / L precipitating agent solution. Add the homogeneous cobalt salt solution and the precipitant solution with a theoretical reaction volume of 1.1 to 1.3 times into the reactor by co-current feeding method, and use the distributed control system (DCS) to control the reaction temperature to 40 to 90°C and the reaction pH to 6.0 to 8.5 , the feeding speed is 200-1000L / h, the stirring speed is 800-1200rpm, and the precipitate of ultra-fine ...

Embodiment 2

[0032] Embodiment 2, with reference to attached figure 1 , 3 .

[0033]Using cobalt-containing ore as raw material, after leaching and purification, a high-purity cobalt-containing cobalt sulfate solution of 60-160g / L is obtained, and cetyltrimethyl is added to the above-mentioned cobalt solution according to 0.05-5% of the cobalt mass One of ammonium bromide (CTAB), polyethylene glycol PEG (1000) or two of them in any ratio, as a cobalt salt solution; ammonium bicarbonate is used as a precipitating agent, and 80-200g is prepared after dissolving and filtering / L precipitant solution. Add the homogeneous cobalt salt solution and the precipitant solution with a theoretical reaction volume of 1.1 to 1.3 times into the reaction kettle by using the co-current feeding method, and use the distributed control system (DCS) to control the reaction temperature to 40-90°C and the reaction pH value to be 6.0 to 8.5 , the feeding speed is 200-1000L / h, the stirring speed is 800-1200rpm, ...

Embodiment 3

[0034] Embodiment 3, with reference to attached figure 1 , 4 .

[0035] Using cobalt-containing ore as raw material, after leaching and purification, a high-purity cobalt-containing cobalt nitrate solution of 60-160g / L is obtained, and polyvinylpyrrolidone (PVP) is added to the above-mentioned cobalt solution according to 0.05-5% of the cobalt mass , polyvinyl alcohol (PVA), water-soluble starch, or two of them in any ratio, as a homogeneous cobalt salt solution; using ammonium carbonate as a precipitant, it is dissolved and filtered to form a 80-200g / L precipitate agent solution. Add the homogeneous cobalt salt solution and the precipitant solution with a theoretical reaction volume of 1.1 to 1.3 times into the reaction kettle by using the co-current feeding method, and use the distributed control system (DCS) to control the reaction temperature to 40-90°C and the reaction pH value to be 6.0 to 8.5 , the feeding speed is 600-1000L / h, the stirring speed is 800-1200rpm, and ...

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Abstract

The invention relates to a method for preparing ultrafine spherical cobalt powder. The method adopts the cobalt ore as the raw material and the homogeneous precipitation-thermal reduction method to continuously prepare the mono-disperse ultra-fine spherical cobalt powder, processes the tail liquid generated during the synthesis process, and returns the tail liquid to the production system for recycling, thereby reducing the wastewater discharge, saving the production water supply and realizing the environment-friendly industrialized mass production of the ultrafine spherical cobalt powder. The prepared product of the ultrafine cobalt powder is in the shape of spherical particle with uniform particle size and intensive distribution. The method has the advantages of simple process, low production cost, high production efficiency, no environmental pollution and suitability for industrialized mass production.

Description

technical field [0001] The invention relates to the preparation of cobalt powder, in particular to a preparation method of ultrafine spherical cobalt powder. Background technique [0002] Ultrafine cobalt powder has been widely used in cemented carbide, diamond tools and battery industries. The basic requirements of cemented carbide for cobalt powder are high purity, fine particle size, close to spherical particle shape, and low degree of agglomeration. This is because spherical cobalt powder has good fluidity, high packing density, lowest porosity and relative sliding friction coefficient, has excellent expansibility and extensibility, and shows good miscibility when mixed with other substances, Make the cemented carbide structure more uniform and dense. In addition, in the diamond products and battery industries, spherical cobalt powder is conducive to the uniformity of mixing materials and better product consistency. [0003] At present, the main methods for preparing ...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 金大庆刘秀庆向波吴建明
Owner ZHEJIANG HUAYOU COBALT
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