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Preparation process of nano cobalt powder

A preparation process, nano-cobalt technology, applied in the direction of nanotechnology, etc., can solve the problems of fast reaction speed, low yield of cobalt powder, high oxygen content, etc.

Pending Publication Date: 2021-10-15
安徽寒锐新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can be completed under the reaction conditions of normal pressure and lower than 100°C, and the reaction speed is fast; the disadvantage is that the yield of cobalt powder is low and the oxygen content is high

Method used

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  • Preparation process of nano cobalt powder

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of 1# nano cobalt powder.

[0034] (a) The cobalt raw material is a mixture of cobalt chloride and cobalt oxalate with a molar ratio of 3:1, and the cobalt raw material is dissolved in 5L of a water-alcoholic mixture of ethanol and water with a specific gravity of 0.85 to obtain a pink raw material solution. Add 25wt% ammonia water and solid sodium hydroxide to the raw material liquid to adjust the pH of the solution to 11.5 to obtain an alkalized raw material liquid, then add Hypersperse MDC708 scale inhibitor to the alkalized raw material liquid, the mixture of Hypersperse MDC708 scale inhibitor and cobalt raw material The mass ratio is 0.15:100, and the cobalt salt solution of cobalt chloride and cobalt oxalate with a cobalt salt concentration of 0.3 mol / L is obtained.

[0035] The reducing agent is added into the cobalt salt solution for pre-reaction to obtain a translucent prefabricated cobalt powder seed crystal solution. In this example, the reducing...

Embodiment 2

[0039] Preparation of 2# nano cobalt powder.

[0040] (a) The cobalt raw material is a mixture of cobalt sulfate and cobalt carbonate with a molar ratio of 5:1, and the cobalt raw material is dissolved in 3L of a water-alcoholic mixture of triethylene glycol and water with a specific gravity of 1.05 to obtain a light red raw material solution. Add solid potassium hydroxide to the raw material solution to adjust the pH of the solution to 13.0 to obtain an alkalized raw material solution, then add a dispersant, the dispersant is a mixture of poly-2-butene sodium oleate and sodium phosphate in a mass ratio of 3.5:1 The mass ratio of the dispersant to the cobalt raw material is 2:100, and the cobalt salt solution of cobalt sulfate and cobalt carbonate having a cobalt salt concentration of 0.65 mol / L is obtained.

[0041] The reducing agent is added into the cobalt salt solution for pre-reaction to obtain a translucent prefabricated cobalt powder seed crystal solution. In this exa...

Embodiment 3

[0045] Preparation of 3# nano cobalt powder.

[0046] (a) The cobalt raw material is a mixture of cobalt chloride and cobalt oxide with a molar ratio of 10:1, and the cobalt raw material is added to 4.5L of a water-alcoholic mixture of ethylene glycol and water with a specific gravity of 1.02 to obtain a pink raw material solution . Add solid sodium hydroxide to the raw material solution to adjust the pH of the solution to 9.0 to obtain an alkalized raw material solution, then add polyvinylpyrrolidone, the mass ratio of polyvinylpyrrolidone to cobalt raw material is 0.1:100, and the concentration of cobalt salt is 0.1mol / L cobalt chloride and cobalt oxide cobalt salt solution.

[0047] The reducing agent is added into the cobalt salt solution for pre-reaction to obtain a translucent prefabricated cobalt powder seed crystal solution. In this embodiment, the reducing agent is sodium borohydride, the molar ratio of reducing agent to cobalt raw material is 0.50:1, the reaction ...

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Abstract

The invention discloses a preparation process of nano cobalt powder. The preparation process comprises the following steps that a reducing agent is added into a cobalt salt solution, and a cobalt powder seed crystal solution is prefabricated; a nitrogen-hydrogen mixed gas is blown into the prefabricated cobalt powder seed crystal solution, and a reduction mother solution containing the nano cobalt powder is obtained; and the reduction mother liquor is separated, and the nano cobalt powder is collected. The defect that a traditional liquid phase hydrogen reduction reaction must be carried out at high temperature and high pressure is overcome, the prepared nano cobalt powder is spherical particles, the particle size of a single particle ranges from 300 nm to 700 nm, the particle size is uniform, and the nano cobalt powder has good dispersity and liquidity and can be widely used for preparing various superfine hard alloy tools.

Description

technical field [0001] The invention relates to a preparation process of nano cobalt powder. Background technique [0002] Cobalt is an amphoteric metal with high hardness, high melting point, corrosion resistance and strong magnetism. It is called "the vitamin of industry" and is widely used in the manufacture of hard alloys, diamond tools, magnetic materials, new energy batteries, high temperature It is also an important raw material for the production of catalysts, ceramic materials, rocket fuel and other products. [0003] Most of the demand for cobalt powder comes from the cemented carbide field. As the best binder phase metal, the physical and chemical properties of cobalt powder, such as particle size, fluidity, and oxygen content, directly affect the product quality and service life of cemented carbide. The strength and hardness of ultra-fine cemented carbide can be highly harmonious and unified, and its service life is 2 to 4 times higher than that of ordinary cem...

Claims

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Application Information

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IPC IPC(8): B22F9/26B82Y40/00
CPCB22F9/26B82Y40/00
Inventor 曲鹏杨生泉王朝安万小虎
Owner 安徽寒锐新材料有限公司
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