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Method for preparing nano nickel powder by precipitation-hydrogen reduction process

A nano-nickel powder and process technology, applied in the field of metal powder preparation, can solve the problems of long reduction time, low production efficiency and high cost, and achieve the effects of shortening precipitation time, improving production efficiency and low production cost

Inactive Publication Date: 2006-05-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After analysis, it can be seen that although the above methods can also obtain nano-nickel powder, some processes are complicated, such as freeze-drying and alcohol aqueous solution reduction;
Some production efficiency is low, such as metal vapor method
In addition, microemulsion technology can also be used to prepare nano-nickel powder, but the reduction time is very long, the separation of mother liquor and the cleaning and separation of slurry are difficult, the production efficiency is very low, and the production cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: adopt Ni(NO 3 ) 2 ·6H 2 0, solution concentration is 0.5mol / L, prepares 0.5kg nano-nickel powder, and method is as follows:

[0027] 1. Preparation of Ni(NO 3 ) 2 ·6H 2 O aqueous solution

[0028] Weigh 2.5kg Ni(NO 3 ) 2 ·6H 2 O, add about 17L deionized water (or distilled water), stir evenly, make it fully dissolved, and configure the concentration of 0.5mol / L Ni(NO 3 ) 2 solution.

[0029] 2. Preparation (NH 4 ) 2 CO 3 aqueous solution

[0030] Take 0.9kg (NH 4 ) 2 CO 3 , add about 17L deionized water (or distilled water), stir to make it fully dissolved, and configure the concentration of 0.5mol / L (NH 4 ) 2 CO 3 solution.

[0031] 3. Preparation of Ni 2 (OH) 2 CO 3 Nano Precipitation Slurry

[0032] (NH 4 ) 2 CO 3 The solution was slowly poured into Ni(NO 3 ) 2 Immediately there will be bubbles in the solution and green Ni 2 (OH) 2 CO 3 For the nano-precipitate, stop stirring after the reaction is over, and let it stand ...

Embodiment 2

[0040] Embodiment 2: Except that the aqueous solution concentration in steps 1 and 2 is 1mol / L, and the reduction temperature in step 7 is 500° C. and kept warm for 20 min, other processes are the same as in Example 1 to obtain nano-nickel powder with a SAXS average particle diameter of 73nm.

Embodiment 3

[0041] Embodiment 3: adopt NiSO 4 ·6H 2 O, the solution concentration is 0.5mol / L, prepare 0.5kg nano-nickel powder, except take by weighing 2.2kg NiSO in step 1 4 ·6H 2 O, in step 7, the reduction temperature is 400° C., and the temperature is kept for 30 minutes. Other processes are the same as in Example 1 to obtain nano-nickel powder with a SAXS average particle size of 70 nm.

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Abstract

The invention provides a method for preparing nanometer nickel powder by deposition-hydrogen-reduced process, belonging to the metal powder preparing technique. The method comprises: dissolving the salt with nickel ion into water to be reacted with prepared (NH4)2CO3 solution to generate a deposit of NI2(OH)2CO3; stably laying said solution and extracting the clean blue solution of upper layer while the nanometer deposited paste of lower layer is separated by centrifugal machine; drying the centrifugally separated powder in the oven to be clean and filtered; reverting the dried powder in the strong-exhaust hydrogen reducing furnace to attain the nanometer nickel powder in the temperature of 200-500 Deg. C. The invention has the advantages of simple device, short process, lower cost and fast-continuous large-scale production.

Description

technical field [0001] The invention belongs to the technical field of metal powder preparation, and in particular provides a method for preparing nano-nickel powder by a precipitation-hydrogen reduction process, which is suitable for industrial production of nano-sized nickel powder. technical background [0002] With the rapid development of science and technology, the application range of nano-scale ultrafine nickel powder is more and more extensive, such as in the nickel-hydrogen fuel cell industry. Nano-nickel powder has been widely used in modern military industry in terms of electromagnetic wave absorption and stealth materials. Various high-porosity metal foam materials, especially special filter materials and devices with ultra-micropores, are problems that need to be solved urgently in the development of high technology in recent years. In particular, special materials for bioengineering and virus filtration, as well as a variety of high-efficiency nano-nickel cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 林涛李会谦汪莉吴成义张丽英郭志猛
Owner UNIV OF SCI & TECH BEIJING
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