Method for preparing fibred cobalt nickel powder and composite oxides powder of cobalt nicker

A technology of composite oxides and nickel-cobalt alloys, applied in the direction of nickel oxide/nickel hydroxide, cobalt oxide/cobalt hydroxide, etc., can solve the problems of difficult control of operating conditions, small specific surface area, high powder density, etc., and achieve easy Realize the effect of industrialization, large specific surface area and small particle size

Inactive Publication Date: 2006-08-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the method for preparing nickel-cobalt composite oxides by wet chemical method is mainly to first generate nickel-cobalt hydroxide, and then calcine nickel-cobalt composite oxides at high temperature. This method has simple equipment, but the operating conditions are not easy to control, and the powder density Larger, smaller specific surface area, lower oxidation activity

Method used

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  • Method for preparing fibred cobalt nickel powder and composite oxides powder of cobalt nicker
  • Method for preparing fibred cobalt nickel powder and composite oxides powder of cobalt nicker
  • Method for preparing fibred cobalt nickel powder and composite oxides powder of cobalt nicker

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Effect test

Embodiment 1

[0050] The nickel chloride solution and the cobalt chloride solution with a nickel-cobalt molar ratio of 4:1 are uniformly mixed, and then the mixed solution and the composite precipitant solution composed of ammonia, ammonium oxalate and dispersant PVP are added to the reactor through the feeding device, in Ni 2+ -Co 2+ -NH 3 -NH 4 + -Cl - -C 2 o 4 2- -H 2 The complex precipitation transformation is carried out in the O system, the temperature is controlled at about 60°C, the pH is adjusted to about 8.0 with ammonia water, and the initial Ni in the feed solution 2+ and Co 2+ The total concentration is 0.6mol / L, C 2 o 4 2- The concentration is 0.66mol / L.

[0051] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of nickel-cobalt alloy powder. After that, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The temperature is controlled at about 400°C. and i...

Embodiment 2

[0053] Mix the nickel nitrate solution and cobalt nitrate solution with a nickel-cobalt molar ratio of 7:3, and then add the composite precipitant solution composed of the mixed solution and the dispersant PVP into the reactor through the feeding device. 2+ -Co 2+ -NH 3 -NH 4 + -NO 3 - -C 2 o 4 2- -H 2 The complex precipitation transformation is carried out in the O system, the temperature is controlled at about 65°C, the pH is about 8.2, and the initial Ni in the feed liquid 2+ and Co 2+ The total concentration is 0.7mol / L, C 2 o 4 2- The concentration is 0.72mol / L.

[0054] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of nickel-cobalt alloy powder. After that, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The temperature is controlled at about 450°C. and in N 2 The thermal decomposition is carried out under the control of the atmosphere; afte...

Embodiment 3

[0056] Mix the nickel sulfate solution and the cobalt sulfate solution with a nickel-cobalt molar ratio of 4:1 evenly, and then add the mixed solution and the composite precipitant solution composed of ammonia, ammonium oxalate and dispersant PVP into the reactor through the feeding device. 2+ -Co 2+ -NH 3 -NH 4 + -SO 4 2- -C 2 o 4 2- -H 2 Composite precipitation transformation is carried out in the O system, the temperature is controlled at about 70°C, the pH is about 8.4, and the initial Ni in the feed solution 2+ and Co 2+ The total concentration is 0.8mol / L, C 2 o 4 2- The concentration is 0.88mol / L.

[0057] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of nickel-cobalt alloy powder. After that, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The temperature is controlled at about 360°C. and in (H 2 +N 2 ) under the control of the atmosphere...

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Abstract

A process for preparing the fibrous NiCo alloy powder and the fibrous nickel cobalt oxide powder features that a depost-transforming thermal decomposition method is used, which includes synthesizing the deposit of their precursor in Ni-Co-NH3-NH4-SG-C2O4-H2O system and the precursor is thermally decomposd ni oxidizing atmosphere to obtain fibrous nickel cobalt oxide powder, or the precursor is thermally decomposed in non-oxidizing atmopshere to obtain fibrous NiCo alloy powder.

Description

Technical field: [0001] The invention relates to a preparation process of powder functional materials, in particular to a preparation method of fibrous nickel-cobalt alloy powder and nickel-cobalt composite oxide powder. Background technique: [0002] Ultrafine Ni-Co alloy powder has a wide range of application prospects in cemented carbide, magnetic materials, catalysts, batteries and other industries due to its special properties different from simple nickel and cobalt metal powders and special surface magnetism. For example, in terms of piezoelectric materials, Ni-Co alloy powder has a high magnetostriction coefficient, a large amount of deformation, a low external magnetic field to generate a saturation magnetic field, a high change in magnetic flux density, and the stability of the magnetic state of the material and environmental factors such as temperature. Good performance, it is the key material of the new generation of drives and sensors; in terms of magnetic record...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/30C01G51/04C01G53/04C01G1/02
Inventor 张传福湛菁邬建辉黎昌俊
Owner CENT SOUTH UNIV
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