A kind of cobalt powder and its preparation method and cobalt oxalate precursor and its preparation method

A cobalt oxalate and precursor technology, applied in the preparation of carboxylate, organic chemistry, etc., can solve the problems of large volume change of cobalt powder, achieve stable and controllable particle size, good product consistency, and reduce the amount of washing water. Effect

Active Publication Date: 2018-08-07
JINGMEN GEM NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above problems, the first aspect of the present invention provides a cobalt powder, the cobalt powder is short rod and / or spherical, the density of the cobalt powder is high, and the bulk density and tap density of the cobalt powder are relatively similar , which solves the problem of large volume changes of cobalt powder in the prior art during press forming and sintering of cemented carbide; the second aspect of the present invention provides a method for preparing cobalt powder; the third and fourth aspects of the present invention Provide a kind of cobalt oxalate precursor and its preparation method respectively

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  • A kind of cobalt powder and its preparation method and cobalt oxalate precursor and its preparation method
  • A kind of cobalt powder and its preparation method and cobalt oxalate precursor and its preparation method
  • A kind of cobalt powder and its preparation method and cobalt oxalate precursor and its preparation method

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preparation example Construction

[0058] Please refer to figure 1 , figure 1 It is a schematic flow diagram of a cobalt powder preparation method in an embodiment of the present invention, comprising the following steps:

[0059] S01, add the reaction bottom liquid in the reaction kettle, add the ammonium oxalate solution and the cobalt salt solution into the reaction bottom liquid in parallel to obtain a mixed solution, adjust the pH of the mixed solution to 2.5-3.5, at 40°C- Perform a stirring reaction at 55°C for 2h-8h to form a cobalt oxalate precipitate at a stirring speed of 100r / min-200r / min; overflow the cobalt oxalate precipitate out of the reactor and enter the aging tank for aging;

[0060] S02, performing solid-liquid separation, drying and screening on the cobalt oxalate precipitate after aging treatment to obtain a cobalt oxalate precursor; the cobalt oxalate precursor is formed by the aggregation of short rod-shaped and / or spherical cobalt oxalate particles spherical aggregates, the bulk densi...

Embodiment 1

[0063] A kind of preparation method of cobalt oxalate precursor, comprises the following steps:

[0064] (1) Add deionized water to the reaction kettle, and add the ammonium oxalate solution with a concentration of 150g / L and the cobalt chloride solution with a concentration of 140g / L into the reaction kettle in parallel, and the addition speed of the ammonium oxalate solution is 380L / h, the addition speed of cobalt chloride solution is 100L / h, obtains mixed solution, adjusts the pH of mixed solution to be 3.5, carries out stirring reaction 2h at 55 ℃, generates cobalt oxalate precipitation, and stirring speed is 100r / min; The cobalt precipitate overflows out of the reaction kettle and enters the aging kettle for aging; the aging temperature is 40°C, and the aging time is 3 hours;

[0065] (2) Centrifuge the aged cobalt oxalate precipitate to obtain a cobalt oxalate solid, then wash the cobalt oxalate solid with 50°C hot water, dry at 120°C, and after crushing, sieve through ...

Embodiment 2

[0069] A kind of preparation method of cobalt oxalate precursor, comprises the following steps:

[0070] (1), add deionized water in the reactor, the concentration is that the ammonium oxalate solution of 150g / L and the cobalt sulfate solution that the concentration is 60g / L are added into the reactor in parallel, and the addition rate of the ammonium oxalate solution is 200L / h, the addition speed of cobalt chloride solution is 150L / h, obtains mixed solution, adjusts the pH of mixed solution to be 3, carries out stirring reaction 3h at 55 ℃, generates cobalt oxalate precipitation, and stirring speed is 200r / min; Cobalt oxalate The precipitate overflows out of the reaction kettle and enters the aging kettle for aging; the aging temperature is 60°C, and the aging time is 2h;

[0071] (2) Centrifuge the aged cobalt oxalate precipitate to obtain a cobalt oxalate solid, then wash the cobalt oxalate solid with 50°C hot water, dry at 120°C, and after crushing, sieve through a 200-me...

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Abstract

The invention provides a cobalt powder, the cobalt powder is in the shape of a short rod and / or spherical shape, the bulk density of the cobalt powder is 0.85-1.1g / cm3, and the tap density is 1.6-1.8g / cm3. The bulk density and tap density of the cobalt powder are similar, and the specific surface area is also relatively high. When applied in the field of hard alloy, it is beneficial to obtain high-quality hard alloy; the invention also provides a preparation of cobalt powder The method, the preparation method adopts a continuous synthesis process, the particle size of the cobalt powder is stable and controllable, and is suitable for industrial production. The present invention also provides a cobalt oxalate precursor, the cobalt oxalate precursor is a spherical aggregate formed by the aggregation of short rod-shaped and / or spherical cobalt oxalate particles, and the bulk density of the cobalt oxalate precursor is 0.5g / cm3‑0.7g / cm3, the tap density is 0.6g / cm3‑1.0g / cm3. The invention also provides a preparation method of the cobalt oxalate precursor.

Description

technical field [0001] The invention belongs to the technical field of metal particle preparation, and in particular relates to a cobalt powder and a preparation method thereof, a cobalt oxalate precursor and a preparation method thereof. Background technique [0002] Cobalt powder is widely used in the field of metallurgy and chemical industry, and is an important raw material for the production of metallurgical and chemical products such as battery electrodes, high hardness alloys, diamond tools and catalyst carriers. [0003] The prior art usually uses cobalt oxalate as the precursor for producing cobalt powder. The cobalt oxalate precursor has the advantages of low oxygen content and relatively simple synthesis process and conditions. However, the morphology of the cobalt oxalate precursor is dendritic. The powder is also fibrous and has a poor appearance. It is difficult to meet the indicators of high-quality cobalt powder in terms of specific area, activity and fluidit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24C07C55/07C07C51/41
Inventor 张云河郭苗苗刘文泽乐绪清
Owner JINGMEN GEM NEW MATERIAL
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