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Precipitation reduction method of preparing nano-cobalt powder

A nano-cobalt and precipitate technology, which is applied in the field of nano-metal powder preparation, can solve the problems of not meeting the demand for quantity and quality, small production scale and low grade of cobalt powder, and achieve the prevention of aggregation, recrystallization, growth and particle size distribution. Narrow, low-cost effect

Inactive Publication Date: 2005-10-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In short, the production scale of cobalt powder in my country is small, the output is small, and the grade is low, which is far from meeting the domestic market's demand for quantity and quality.

Method used

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  • Precipitation reduction method of preparing nano-cobalt powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, when preparing 1kg nanometer cobalt powder, should finish according to the following steps.

[0030] 1. Weigh 4.7682kg (16.969mol) of cobalt sulfate (CoSO 4 ·7H 2 O) powder by 1mol / L concentration, cobalt sulfate (CoSo 4 ·7H 2O) The powder is poured into 16.969kg of deionized water, heated to 60° C., stirred and dissolved to make an aqueous solution of cobalt sulfate.

[0031] 2. Add 1.3572kg (33.938mol) of NaOH powder into the above solution and continue heating and stirring to generate pink Co(OH) 2 colloidal precipitate.

[0032] 3. Pump the pink slurry into a continuous high-speed centrifuge, separate the mother liquor and wash the Co(OH) with deionized water or distilled water repeatedly 2 powdery precipitate, until the acid radicals and Na +1 The ions are cleaned, and finally the cleaning solution is centrifuged out to obtain Co(OH) with a small amount of water. 2 powder block.

[0033] 4. The above Co(OH) 2 Put the powder into a vacuum dryi...

Embodiment 2

[0036] Embodiment 2, should finish according to the following steps when preparing 10kg nanometer cobalt powder

[0037] 1. Weigh 47.682kg (169.69mol) of cobalt sulfate (CoSO4 7H2O) powder, pour it into 169.69kg of deionized water, heat to 80°C and continuously stir and dissolve to make an aqueous solution of cobalt sulfate.

[0038] 2. Weigh 13.572kg (339.38mol) of NaOH powder and add it into the above solution and continue heating and stirring to generate pink Co(OH) 2 colloidal precipitate.

[0039] 3. Exactly the same as 3 in Example 1

[0040] 4. The above Co(OH) 2 Put the powder into a vacuum drying oven, and dry it in a vacuum at 20Pa, 85°C, for 60 minutes to obtain dry Co(OH) 2 powder.

[0041] 5. Dry the Co(OH) 2 The powder is put into the continuous strong drainage type H 2 450°C in reduction furnace, 40 minutes, H 2 Air section flow rate 40ml / cm 2 min, after reduction, it can be made (SAXS) with an average particle size of 44.5nm and a median diameter of d ...

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Abstract

A process for preparing cobalt nanoparticles by deposition-reduction method includes such steps as displacing reaction between the aqueous solution of soluble Co salts and NaOH or KOH to obtain the nano-colloid deposit of Co(OH)2, centrifugal separation of mother liquid, washing repeatedly, centrifugal separation of waste liquid, vacuum drying, and reducing by H2.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer metal powder in metal materials, and in particular provides a precipitation-reduction method for preparing nanometer cobalt powder, which is suitable for industrial production. Background technique [0002] There are many similarities in the chemical properties of nickel and cobalt. In ore deposits, the two often accompany each other, and cobalt is generally mined as an associated ore of nickel. Cobalt is a rare metal, mainly used in high-performance alloys, hard alloys, chemical pigments, magnetic materials, catalysts and rechargeable battery industries. In 1998, the global annual consumption of cobalt reached 31,000 tons, and it has been increasing in recent years. China is a country that lacks cobalt resources. The source of cobalt mainly depends on importing cobalt concentrate and recycling cobalt-containing waste. [0003] At present, the main methods for preparing ultrafin...

Claims

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Application Information

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IPC IPC(8): B22F9/26
Inventor 吴成义张丽英林涛汪莉
Owner UNIV OF SCI & TECH BEIJING
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