Method for preparing spherical ultrafine nickel powder at room temperature

A spherical, room temperature technology, applied in the field of preparing spherical ultra-fine nickel powder, can solve the problems of smoothness and inability to prepare a surface, and achieve the effects of uniform particle size, excellent physical and chemical properties, and low production cost.

Active Publication Date: 2013-03-13
KUNMING SHUYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem that the prior art cannot prepare superfine nickel powder with smooth surface and good sphericity at normal temperature, the present invention provides a method for preparing spherical nickel powder at normal temperature The method for superfine nickel powder, its technical scheme is as follows:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Process and steps in the present embodiment are as follows:

[0043] Under the condition that the temperature is 20°C, a nickel sulfate solution is prepared first, and a surfactant is added to the nickel sulfate solution; a sodium hydroxide solution is added to the hydrazine solution, and the pH value of the solution is adjusted to 12. Then add the nickel sulfate solution into the hydrazine solution, and react for 30 minutes under the condition that the mechanical stirring speed is 1500 r / min. Wherein the concentration of nickel sulfate solution is 0.2mol / L, the surfactant is polyvinylpyrrolidone, the mass concentration is 1%, the concentration of sodium hydroxide is 0.5mol / L, [hydrazine] / [Ni 2+ ]=2.2:1. After the reaction is completed, filter with suction, wash with deionized water until neutral, wash with acetone for 3 times, and then dry in an oven at 60°C. The particle size of the powder is 300~500nm, and it is spherical.

Embodiment 2

[0045] Process and steps in the present embodiment are as follows:

[0046] Under the condition that the temperature is 25°C, a nickel sulfate solution is prepared first, and a surfactant is added to the nickel sulfate solution; a sodium hydroxide solution is added to the hydrazine solution, and the pH value of the solution is adjusted to 14. Then add the nickel sulfate solution into the hydrazine solution, and react for 30 minutes under the condition that the mechanical stirring speed is 2000 r / min. Wherein the concentration of nickel sulfate solution is 1mol / L, the surfactant is polyvinylpyrrolidone, the mass concentration is 2%, the concentration of sodium hydroxide is 2mol / L, [hydrazine] / [Ni 2+ ]=6:1. After the reaction is completed, filter with suction, wash with deionized water until neutral, wash with acetone for 3 times, and then dry in an oven at 60°C. The particle size of the powder is 100~300nm, and it is spherical.

Embodiment 3

[0048] Process and steps in the present embodiment are as follows:

[0049]At a temperature of 22.5°C, a nickel sulfate solution was first prepared, and a surfactant was added to the nickel sulfate solution; sodium hydroxide solution was added to the hydrazine solution to adjust the pH of the solution to 13. Then, the nickel sulfate solution was added into the hydrazine solution, and the reaction was performed for 30 minutes under the condition that the mechanical stirring speed was 1750 r / min. Wherein the concentration of nickel sulfate solution is 0.75mol / L, the surfactant is polyvinylpyrrolidone, the mass concentration is 1.5%, the concentration of sodium hydroxide is 1.25mol / L, [hydrazine] / [Ni 2+ ]=4.1:1. After the reaction is completed, filter with suction, wash with deionized water until neutral, wash with acetone for 3 times, and then dry in an oven at 60°C. The particle size of the powder is 200~300nm, and it is spherical.

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PUM

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Abstract

The invention relates to a method for preparing spherical ultrafine nickel powder at a room temperature, which belongs to the technical field of the preparation of function powder materials, and solves the problems of the prior art that the ultrafine nickel powder cannot be prepared at the room temperature. The method comprises the following steps of (1) placing surface active agent into aqueous solution of nickelous salt at the temperature of 20DEG C to 25DEG C to prepare nickel salt active solution; (2) placing aqueous alkali into hydrazine or hydrazine hydrate at the temperature of 20DEG C to 25DEG C, and adjusting the pH value to 12 to 14 to prepare the alkali reducing agent; (3) slowly adding the nickel salt active solution into the alkali reducing agent during the intense agitation process at the temperature of 20DEG C to 25DEG C to be reacted for 30min, and obtaining reaction mixture; and (4) pumping and filtering the reaction mixture at the temperature of 20DEG C to 25DEG C to obtain solids, washing the obtained solids to be neutral through the deionized water, washing the solids for three times through acetone, and then placing the solids into a drying box at the temperature of 60DEG C to be dried, and thus preparing the spherical ultrafine nickel powder. Due to the adoption of the method, the spherical ultrafine nickel powder can be prepared at the room temperature, the cost is low, and convenience in operation can be realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional powder materials, and relates to a method for preparing spherical ultrafine nickel powder. Background technique [0002] Ultrafine nickel powder has the characteristics of high surface activity, large specific surface area, and good conductivity. It has shown good performance in the fields of catalysts, battery materials, powder metallurgy, and multilayer ceramic capacitors. It has been widely used and the market demand has grown. soon. [0003] At present, the production methods of ultra-fine nickel powder mainly include electrolysis, nickel carbonyl thermal decomposition, gas phase hydrogen reduction, evaporation-condensation, solution reduction and other methods. However, these methods all have problems such as high cost or difficult realization of industrialization, especially at present, the domestic ultra-fine nickel powder production industry is still relatively backward,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 王敏谭宁黄峰
Owner KUNMING SHUYANG TECH
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