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

A technology of composite oxides and nickel-cobalt alloys, which is applied in the direction of nickel oxide/nickel hydroxide, cobalt oxide/cobalt hydroxide, etc., can solve the problems of difficult control of operating conditions, low oxidation activity, and high powder density, and achieve operational Ease of control, high purity, small particle size effect

Inactive Publication Date: 2005-03-30
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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Embodiment 1

[0045] The nickel chloride solution and the cobalt chloride solution with a ratio of nickel to cobalt 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. Ni 2+ -Co 2+ -NH 3 -NH 4 + -Cl - -C 2 O 4 2- -H 2 The composite precipitation transformation is carried out in the O system, the temperature is controlled at about 60℃, the pH is adjusted to about 8.0 with ammonia water, and the initial Ni in the material liquid 2+ And Co 2+ The total concentration is 0.6mol / L, C 2 O 4 2- The concentration is 0.66mol / L.

[0046] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the nickel-cobalt alloy powder precursor. After that, the precursor is put into a burning boat and placed in a PID-adjusted electric furnace, and the temperature is controlled to be about 400°C. And in (H 2 +N 2 ...

Embodiment 2

[0048] The nickel nitrate solution and the cobalt nitrate solution with a ratio of nickel to cobalt of 7:3 are uniformly mixed, and then the composite precipitation agent solution composed of the mixed solution and the dispersant PVP is added to the reactor through the feeding device, and the Ni 2+ -Co 2+ -NH 3 -NH 4 + -NO 3 - C 2 O 4 2- -H 2 The composite precipitation transformation is carried out in the O system, the temperature is controlled to be about 65℃, 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.

[0049] 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-adjusted electric furnace, and the temperature is controlled to be about 450°C. And in N 2 Thermal decomposition is carried out under atm...

Embodiment 3

[0051] The nickel sulfate solution and the cobalt sulfate solution with a ratio of nickel to cobalt of 4:1 are uniformly mixed, and then the mixed solution and the composite precipitation agent solution composed of ammonia, ammonium oxalate and dispersant PVP are added to the reactor through the feeding device, and the Ni 2+ -Co 2+ -NH 3 -NH 4 + -SO 4 2- -C 2 O 4 2- -H 2 The composite precipitation transformation is carried out in the O system, the temperature is controlled at about 70℃, the pH is about 8.4, and the initial Ni in the feed liquid 2+ And Co 2+ The total concentration is 0.8mol / L, C 2 O 4 2- The concentration is 0.88mol / L.

[0052] 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-adjusted electric furnace, and the temperature is controlled to be about 360°C. And in (H 2 +N 2 ) Thermal deco...

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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] Ultra-fine 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 and special surface magnetism that are different from elemental nickel and cobalt metal powders. For example, in terms of piezomagnetic materials, Ni-Co alloy powder has a high magnetostriction coefficient, a large amount of deformation, a low external magnetic field that generates a saturated magnetic field, a high change in magnetic flux density, and the magnetic state of the material and the stability of environmental factors such as temperature It is a key material for a new generation of drives and sensors. In terms of magnetic recording material...

Claims

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Application Information

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