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Preparation method of ultrafine cobalt powder

A technology of ultrafine cobalt powder and cobalt salt, which is applied in the field of preparation of ultrafine cobalt powder, can solve the problems of high cost and large consumption, and achieve the effects of low production cost, high production efficiency and reduced product cost

Inactive Publication Date: 2010-02-03
ZHEJIANG HUAYOU COBALT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is more costly
[0011] In addition, the CN1686650 patent discloses a method for preparing nano-cobalt powder by precipitation-reduction, which mentions the use of NaOH or KOH as a precipitant, but the obtained 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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  • Preparation method of ultrafine cobalt powder
  • Preparation method of ultrafine cobalt powder
  • Preparation method of ultrafine cobalt powder

Examples

Experimental program
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Embodiment 1

[0035] Embodiment 1 (with reference to figure 1 , 2 )

[0036] The cobalt-containing ore is used as a raw material, and after leaching and purification, a high-purity cobalt-containing 80-150 g / L cobalt chloride solution is obtained. The above cobalt chloride solution is pressure sprayed under the pressure of 0.2-5 MPa to obtain cobalt chloride mist droplets. Dehydrate the mist droplets obtained by spraying at 500-750°C for 10-40 seconds in an air or oxygen atmosphere to remove most of the water in the solution; then at a high temperature of 800-950°C Carry out calcination reaction for 20-80 seconds; then carry out crystal reformation reaction at 700-850°C for 30-100 seconds to obtain cobalt oxide, and release tail gas containing water vapor and acid gas at the same time. The tail gas generated during the high-temperature roasting process is sprayed and absorbed to obtain hydrochloric acid, and then the hydrochloric acid is returned for the leaching and purification process...

Embodiment 2

[0043] Embodiment 2 (with reference to figure 1 , 3 )

[0044]The cobalt-containing ore is used as a raw material, and after leaching and purification, a high-purity cobalt-containing cobalt sulfate solution of 80-150 g / L is obtained. The above cobalt sulfate solution is pressure sprayed under a pressure of 0.2-5 MPa to obtain cobalt sulfate mist droplets. Dehydrate the mist droplets obtained by spraying under air or oxygen atmosphere at 600-750°C for 20-40 seconds to remove the water in the solution; -80 seconds roasting reaction; then carry out 30-100 seconds crystal reformation reaction at a high temperature of 700-850 ° C to obtain cobalt oxides, and at the same time release tail gas containing water vapor and acid gas; the tail gas generated during high-temperature roasting, Sulfuric acid is obtained after spray absorption treatment, and then the sulfuric acid is returned for the leaching purification process. Send the prepared cobalt oxide into the reduction furnace,...

Embodiment 3

[0051] Embodiment 3 (with reference to figure 1 , 4 )

[0052] The cobalt-containing ore is used as a raw material, and after leaching and purification, a high-purity cobalt-containing 80-150 g / L cobalt nitrate solution is obtained. The above cobalt chloride solution is pressure sprayed under a pressure of 0.2-5 MPa to obtain cobalt nitrate mist droplets. Dehydrate the mist droplets obtained by spraying under air or oxygen atmosphere at 600-750°C for 20-40 seconds to remove the water in the solution; -80 seconds roasting reaction; then carry out 30-100 seconds crystal reformation reaction at a high temperature of 700-850 ° C to obtain cobalt oxides, and at the same time release tail gas containing water vapor and acid gas; the tail gas generated during high-temperature roasting, Nitric acid is obtained after spray absorption treatment, and then the nitric acid is returned for the leaching purification process. Send the prepared cobalt oxide into the reduction furnace, and ...

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Abstract

The invention discloses a preparation method of ultrafine cobalt powder. Some prior methods have the disadvantages of higher cost, or existence of discharge problems of ammonia-nitrogen waste water, or coarser cobalt powder particles or difficult acquisition of high-purity products, and the like; and the prior methods are not suitable for large-scale industrialized production. In the invention, the cobalt ore is used as raw material, a spraying and roasting-reducing method is used for preparing ultrafine spherical cobalt powder, and meanwhile, the tail gas generated in the spraying and roasting processes is absorbed, treated and returns to a production system for recycling, thereby shortening the technological processes, reducing the discharge of the waste water and achieving the purposesof environmental protection and large-scale industrialized production of ultrafine spherical cobalt powder.

Description

technical field [0001] The invention relates to the field of preparation of cobalt powder, in particular to a preparation method of ultrafine cobalt powder. Background technique [0002] Ultrafine cobalt powder is currently 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. 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 ultrafine cobalt powder are high-pressure water mist method, hydrogen reduction method, γ-ray irradiation method, precipitation-thermal decomposition method, polyol reduction method, electrolysis method and microemulsion method. [0004] The high-pressure water atomization method is a physical method, tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 向波刘秀庆
Owner ZHEJIANG HUAYOU COBALT
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