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Reduction method for preparing superfine cobalt powder by hydrazine hydrate

A technology of ultra-fine cobalt powder and hydrazine hydrate, which is applied in the field of preparing ultra-fine cobalt powder by reduction of hydrazine hydrate, can solve the problems of high cost, low purity of cobalt powder, low efficiency, etc. Barrier lowering effect

Active Publication Date: 2013-01-23
GEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method for preparing ultrafine cobalt powder by reduction of hydrazine hydrate, which solves the technical problems of low efficiency, high cost and low purity of the prepared cobalt powder in the prior art.

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  • Reduction method for preparing superfine cobalt powder by hydrazine hydrate
  • Reduction method for preparing superfine cobalt powder by hydrazine hydrate

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Embodiment 1

[0030] see figure 2 , figure 2 Show the flow chart of the method for preparing ultrafine cobalt powder by reduction of hydrazine monohydrate in the embodiment of the present invention, including the following steps:

[0031] i, preparation of cobalt salt and dispersant mixed solution:

[0032] Prepare a cobalt salt with a concentration of 0.8 mol / L, add cyclodextrin to the cobalt salt solution, the molar weight of the cyclodextrin is 0.4 times the molar weight of cobalt ions, and stir for 30 minutes to obtain the first solution;

[0033] ii, preparation of cobalt salt complexes:

[0034] Adjust the temperature of the first solution to 80° C., add hydrazine hydrate with a weight percentage of 80%, and react for 15 minutes to obtain a second solution. The molar ratio of cobalt ions in the hydrazine hydrate and cobalt salt solution is 1.3:1;

[0035] iii. Preparation of cobalt powder

[0036] Adjust the pH value of the second solution to 12, add hydrazine hydrate so that th...

Embodiment 2

[0038] The method for preparing superfine cobalt powder by reduction of hydrazine hydrate in the embodiment of the present invention comprises the following steps:

[0039] i, preparation of cobalt salt and dispersant mixed solution:

[0040] Prepare a cobalt salt with a concentration of 0.9 mol / L, add sodium hypophosphite to the cobalt salt solution, the molar weight of the sodium hypophosphite is 0.45 times the molar weight of cobalt ions, and stir for 40 minutes to obtain the first solution;

[0041] ii, preparation of cobalt salt complexes:

[0042] Adjust the temperature of the first solution to 82° C., add hydrazine hydrate with a weight percentage of 80%, and react for 20 minutes to obtain a second solution. The molar ratio of cobalt ions in the hydrazine hydrate and cobalt salt solution is 1.4:1;

[0043] iii. Preparation of cobalt powder

[0044] Adjust the pH value of the second solution to 12.5, add hydrazine hydrate so that the total molar ratio of hydrazine hydrat...

Embodiment 3

[0046] The method for preparing superfine cobalt powder by reduction of hydrazine hydrate in the embodiment of the present invention comprises the following steps:

[0047] i, preparation of cobalt salt and dispersant mixed solution:

[0048] Prepare a cobalt salt with a concentration of 1.0 mol / L, add cyclodextrin to the cobalt salt solution, the molar weight of the cyclodextrin is 0.5 times the molar weight of cobalt ions, and stir for 50 minutes to obtain the first solution;

[0049] ii, preparation of cobalt salt complexes:

[0050] Adjust the temperature of the first solution to 85° C., add hydrazine hydrate with a weight percentage of 80%, and react for 20 minutes to obtain a second solution. The molar ratio of cobalt ions in the hydrazine hydrate and cobalt salt solution is 1.5:1;

[0051] iii. Preparation of cobalt powder

[0052] Adjust the pH value of the second solution to 13, add hydrazine hydrate so that the total molar ratio of hydrazine hydrate to the cobalt i...

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Abstract

The invention is applied to the field of metal micro-particle preparation, and provides a reduction method for preparing superfine cobalt powder by hydrazine hydrate. The method comprises the following steps of: preparing mixed solution of cobalt salt and a dispersing agent; preparing cobalt salt complex; and preparing cobalt powder. According to the reduction method provided by the invention for preparing superfine cobalt powder by hydrazine hydrate, firstly, the hydrazine hydrate is added in order to form hydrazine hydrate-cobalt complex, the hydrazine hydrate-cobalt complex is subject to the pH (potential of hydrogen) adjustment and then is added in hydrazine hydrate for reacting, in this way, the reaction potential barrier of hydrazine hydrate and cobalt salt is greatly reduced, the reaction of hydrazine hydrate and cobalt becomes completely and fully, the production efficiency is improved, the production cost is reduced, the prepared cobalt powder is high in purity and is widely used in the industrial field.

Description

technical field [0001] The invention belongs to the technical field of particle preparation, and in particular relates to a method for preparing superfine cobalt powder by reduction of hydrazine hydrate. Background technique [0002] Because of its excellent physical and chemical properties, cobalt powder is widely used in cemented carbide, magnetic materials, catalysts, etc. Scientific practice has proved that when a substance is processed to an extremely fine size, surface effects, volume effects and quantum effects will occur, resulting in changes in physical and chemical properties. [0003] At present, there are many methods for preparing ultrafine cobalt powder, including cobalt oxide, cobalt oxalate hydrogen reduction method, cobalt oxalate thermal dissociation method, polyol cobalt salt reduction method and hydrazine hydrate cobalt salt reduction method. Among them, the superfine cobalt powder prepared by reduction of hydrazine hydrate cobalt powder has excellent pe...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 马琳何显达石玉洁苏陶贵王勤陈艳红
Owner GEM CO LTD
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