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Preparation method of superfine spherical cobalt powder

A spherical, cobalt powder technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of difficult to produce ultra-fine cobalt powder, large particle size of cobalt powder, short preparation process, etc. control, uniform particle size distribution and good flow performance

Pending Publication Date: 2021-02-12
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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Problems solved by technology

[0003] For a long time, the use of hydrogen reduction method to prepare ultra-fine cobalt powder mainly adopts the method of synchronous decomposition and reduction of cobalt salts such as cobalt carbonate or cobalt oxalate. During reduction and reduction, the nucleation and growth of cobalt powder crystals occur synchronously, resulting in a large particle size of cobalt powder. This method is suitable for the production of cobalt powder with a Fischer particle size of 1.0 μm or more, and it is basically difficult to produce cobalt powder in the Fischer particle size range Ultrafine cobalt powder at 0.4~0.8μm

Method used

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  • Preparation method of superfine spherical cobalt powder
  • Preparation method of superfine spherical cobalt powder
  • Preparation method of superfine spherical cobalt powder

Examples

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Effect test

Embodiment 1

[0033] Step 1: Use pure water to prepare ammonium bicarbonate solution and cobalt chloride solution respectively. The concentration of the ammonium bicarbonate solution is 180g / L, and the cobalt chloride solution is 90g / L. Put the ammonium bicarbonate solution into the reactor and heat to 44°C , and then under the condition of stirring and heat preservation, the cobalt chloride solution is added dropwise into the reactor to react with ammonium bicarbonate to synthesize cobalt carbonate precipitation, and the pH value at the end of the reaction is 6.8.

[0034] Step 2: The cobalt carbonate precipitate was washed with pure water at 70°C, slurried, and dried in a flash drying oven to obtain cobalt carbonate powder at a drying temperature of 120°C.

[0035] Step 3: Put the cobalt carbonate powder into the rotary kiln, and heat and decompose it in an oxygen-free state to obtain cobaltous oxide. In the calciner, a protective inert gas nitrogen with a slight positive pressure of 10Pa ...

Embodiment 2

[0039] Step 1: Use pure water to prepare ammonium bicarbonate solution and cobalt chloride solution respectively. The concentration of the ammonium bicarbonate solution is 190g / L, and the cobalt chloride solution is 95g / L. Put the ammonium bicarbonate solution into the reactor and heat to 44°C , and then under the condition of stirring and heat preservation, the cobalt chloride solution is added dropwise into the reactor to react with ammonium bicarbonate to synthesize cobalt carbonate precipitate, and the pH value at the end of the reaction is 6.9.

[0040] Step 2: The cobalt carbonate precipitate was washed with pure water at 75°C, slurried, and dried in a flash drying oven to obtain cobalt carbonate powder at a drying temperature of 120°C.

[0041] Step 3: Put the cobalt carbonate powder into the rotary kiln, and heat and decompose it in an oxygen-free state to obtain cobaltous oxide. In the calciner, a protective inert gas nitrogen with a slight positive pressure of 14Pa is...

Embodiment 3

[0045] Step 1: Use pure water to prepare ammonium bicarbonate solution and cobalt chloride solution respectively. The concentration of ammonium bicarbonate solution is 200g / L, and the concentration of cobalt chloride solution is 120g / L. Put the ammonium bicarbonate solution into the reactor and heat to 46°C , and then under the condition of stirring and heat preservation, the cobalt chloride solution is added dropwise into the reactor to react with ammonium bicarbonate to synthesize cobalt carbonate precipitate, and the pH value at the end of the reaction is 7.0.

[0046] Step 2: The cobalt carbonate precipitate was washed with pure water at 80°C, slurried, and dried in a flash drying oven to obtain cobalt carbonate powder at a drying temperature of 120°C.

[0047] Step 3: Put the cobalt carbonate powder into a rotary kiln, and heat and decompose it in an oxygen-free state to obtain cobaltous oxide. In the calciner, a protective inert gas nitrogen with a slight positive pressur...

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Abstract

The invention relates to the technical field of cobalt-based powder material preparation, in particular to a preparation method of superfine spherical cobalt powder. The method comprises the followingsteps that (1), a cobalt salt solution reacts with an ammonium bicarbonate or sodium carbonate precipitant under a heating condition to obtain cobalt carbonate precipitate; (2), the cobalt carbonateprecipitate is filtered, washed with pure water, and dried to obtain cobalt carbonate powder; (3), the cobalt carbonate powder is placed into a calcining furnace, and heated and decomposed in an oxygen-free state to obtain cobaltous oxide; (4), the cobalt monoxide powder obtained by calcining and decomposing is placed into a reduction furnace, and hydrogen is introduced for reduction to obtain a loose spongy cobalt block; and (5), airflow milling is carried out on the spongy cobalt block in a closed cycle inert gas protective atmosphere to obtain the ultrafine spherical cobalt powder with theFisher particle size being 0.4-0.8 micrometer. The particle size of the prepared cobalt powder reaches the ultrafine grade, the cobalt powder is spherical, and the cobalt powder has the advantages ofbeing uniform and controllable in particle size, uniform in particle size distribution, good in flowing property and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of cobalt-based powder materials, in particular to a preparation method of ultrafine spherical cobalt powder. Background technique [0002] Cobalt powder is widely used in high-temperature alloys, hard alloys, diamond tools, battery industry and magnetic materials and other industries. In recent years, with the rapid development of technology in the downstream alloy industry, the demand for cobalt powder is increasing, and its quality requirements are becoming increasingly stringent. At present, there are many methods for preparing cobalt powder at home and abroad, mainly including hydrogen reduction method, oxalate thermal decomposition method, water atomization method, electrolysis method, polyol liquid phase reduction method, etc. Among them, the hydrogen reduction method is more suitable for industrial mass production because of its relatively simple process flow. At present, it has becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22B22F1/065
Inventor 刘冠宇田礼平郑德洲刘人生
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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