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Method for preparing powder of fibroid nickel powder and powder of nickelous oxide

A nickel oxide powder and fibrous technology, which is applied in the field of preparation of special powder functional materials, can solve the problems of coarse particle size, high impurity content, and no fibrous morphology characteristics, and achieve strong oxidation resistance and large specific surface area Effect

Inactive Publication Date: 2007-02-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation method of nickelous oxide powder at home and abroad is generally obtained by calcination with nickel carbonate, nitrate or hydroxide as raw material, and nickel chloride is also used as raw material, adding ammonium oxalate to generate nickel oxalate precipitation, and then Calcined in air; the products obtained by these methods have high impurity content, coarse particle size, and no fibrous morphology
In addition, there are some other methods for preparing nickel oxide powder, but most of these methods focus on the preparation of spherical nickel oxide or nano-film, and there are few reports on fibrous nickel oxide powder.

Method used

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  • Method for preparing powder of fibroid nickel powder and powder of nickelous oxide
  • Method for preparing powder of fibroid nickel powder and powder of nickelous oxide
  • Method for preparing powder of fibroid nickel powder and powder of nickelous oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The nickel chloride solution and the composite precipitant solution composed of ammonia, ammonium oxalate and dispersant PVP are added to the reactor through the feeding device. 2+ -NH 3 -NH 4 + -Cl - -C 2 o 4 2- -H 2 Composite precipitation conversion is carried out in the O system, the temperature is controlled at about 60°C, the pH of the solution is adjusted to about 8.5 with ammonia water, and the initial Ni in the feed solution 2+ Concentration is 0.8mol / l, C 2 o 4 2- The concentration is 0.88mol / L.

[0045] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of nickel 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 the (H 2 +N 2 ) under the control of the atmosphere for thermal decomposition. After the thermal decomposition is completed, it is cooled under a carbon diox...

Embodiment 2

[0047] Add the nickel nitrate solution and the composite precipitant solution composed of ammonia, ammonium oxalate and dispersant PVP into the reactor through the feeding device. 2+ -NH 3 -NH 4 + -NO 3 - -C 2 o 4 2- -H 2 Composite precipitation conversion is carried out in the O system, the temperature is controlled at about 65°C, the pH value is about 8.6, and the initial Ni in the feed solution 2+ Concentration is 0.6mol / L, C 2 o 4 2- The concentration is 0.72mol / L.

[0048] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of nickel 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 in N 2 The thermal decomposition is carried out under the control of the atmosphere. After the thermal decomposition is completed, it is cooled under the carbon dioxide atmosphere and the surface is ant...

Embodiment 3

[0050] The nickel sulfate solution and the composite precipitant solution composed of ammonia, ammonium oxalate and dispersant PVP are added to the reactor through the feeding device. 2+ -NH 3 -NH 4 + --NO 3 - -C 2 o 4 2- -H 2 Composite precipitation transformation was carried out in the O system, the temperature was controlled at 70°C, the pH value was 8.8, and the initial Ni in the feed solution 2+ The concentration is 0.5mol / l, C 2 o 4 2- The concentration is 0.65 mol / l.

[0051] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of nickel powder. Afterwards, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The temperature is controlled at 360 ° C, and in ( h 2 +N 2 ) under the control of the atmosphere. After the thermal decomposition is completed, it is cooled under the carbon dioxide atmosphere and the surface is anti-oxidized to room temperature. ...

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Abstract

A process for preparing the fibrous Ni powder and nickelous oxide powder features that the deposit-transforming thermodecomposing method is used, which includes synthesizing the deposit of their precursor in Ni-NH3-NH4-SG-C2O4-H2O system and the precursor is thermally decomposed in oxidizing atmosphere to obtain to obtain fibrous nickelous oxide powder or in non-oxidizing atmopshere to obtain fibrous Ni powder.

Description

Technical field: [0001] The invention relates to a preparation process of a special powder functional material, in particular to a preparation method of fibrous nickel powder and nickelous oxide powder. Background technique: [0002] Special nickel powder has many special functions in the fields of catalyst, battery material, conductive paste, electromagnetic wave absorbing material, microporous filter material, powder metallurgy and other fields due to its great volume effect, surface effect and morphology characteristics. As a new type of material, more and more attention has been paid to it, and its application is wide and the demand is large. The currently used special nickel powder is mainly produced by the carbonyl method. The method is carried out under high temperature and high pressure, the nickel carbonyl is flammable, explosive, toxic and pollutes the environment, the process control is complex, and the particle size of the product can only reach the micron level...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/30C01G53/04
Inventor 张传福邬建辉湛菁黎昌俊吴琳琳
Owner CENT SOUTH UNIV
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