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Method for producing surface-activated superfine nickel powder

A technology of surface activation and production method, applied in the field of metal powder preparation, can solve the problems of difficult implementation, low production efficiency and high cost, and achieve the effects of easy industrialization implementation, reduced consumption cost and low production cost

Inactive Publication Date: 2010-08-11
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods have seriously affected their scope of application due to their low production efficiency and high cost.
U.S. Patent 2805149 and Chinese Patents 86100739B and 87101491 are hydrothermal slurry hydrogen reduction methods similar to the present invention. The common point of these three methods is that the pH value of the slurry is neutral, weakly acidic or alkaline. The first two methods It is necessary to filter and wash the precursor to neutrality and then re-slurry with water for hydrogen reduction. The third method is to directly carry out hydrogen reduction without washing. The three methods have harsh conditions and require high temperature and high pressure to complete the reaction. This is not only Increased production costs, and difficult to implement in industrial practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 2 kg of nickel sulfate hexahydrate was prepared into a solution and mixed with excess sodium hydroxide solution, the pH was controlled to be 8-10, and the concentration of ruthenium trichloride was added to 2.5 mg / L, fully stirred, and the slurry was transferred to an autoclave for passage. For hydrogen reaction, control the reaction temperature at 65°C, hydrogen partial pressure at 0.8MPa, react for 40 minutes, take out the liquid-solid separation, wash the solid phase with deionized water three times, and dry it in an oven at 100-120°C. The precursor powder is placed in a belt-type hydrogen reduction furnace with continuous feeding and discharging, and the reduction temperature is controlled at 300°C for 40 minutes to obtain ultra-fine nickel powder with a purity greater than 99.5% and an average particle size of less than 2.0 microns. The ultra-fine nickel powder after being baked can be stored in vacuum packaging.

Embodiment 2

[0027] Example 2 2 kg of nickel sulfate hexahydrate was made into a solution and mixed with excess sodium hydroxide solution, the pH was controlled to be 8-10, and the concentration of ruthenium trichloride was added to be 5 mg / L, fully stirred, and transferred to an autoclave for hydrogen reaction. Control the reaction temperature to 75°C, hydrogen partial pressure to 0.8MPa, react for 40 minutes to take out the liquid-solid separation, wash the solid phase with deionized water three times, and dry it in an oven at 100-120°C. The powder is placed in a belt-type hydrogen reduction furnace with continuous feeding and discharging, and the reduction temperature is controlled at 400°C for 30 minutes to obtain ultra-fine nickel powder with a purity greater than 99.5% and an average particle size of less than 2.0 microns. The ultra-fine nickel powder after being baked can be stored in vacuum packaging.

Embodiment 3

[0028] Example 3 2 kg of nickel sulfate hexahydrate was prepared into a solution and mixed with excess sodium hydroxide solution, the pH was controlled to be 8-10, the concentration of ruthenium trichloride was added to be 10 mg / L, fully stirred, and transferred to an autoclave for hydrogen reaction. Control the reaction temperature to 85°C, hydrogen partial pressure to 0.8MPa, react for 40 minutes to take out the liquid-solid separation, wash the solid phase with deionized water three times, and dry it in an oven at 100-120°C, and dry the precursor The powder is placed in a belt-type hydrogen reduction furnace with continuous feeding and discharging, and the reduction temperature is controlled at 500°C for 30 minutes to obtain ultra-fine nickel powder with a purity greater than 99.5% and an average particle size of less than 2.0 microns. The ultra-fine nickel powder after being baked can be stored in vacuum packaging.

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Abstract

The invention discloses a method for producing surface-activated superfine nickel powder. The process comprises the following steps of: dissolving nickel sulfate hexahydrate in water; reacting the obtained solution with prepared alkaline liquor to produce nickel hydroxide precipitate; adding a certain amount of noble metal ruthenium trichloride into the precipitate so as to activate the surface of a precursor; directly adding nickel hydroxide paste into a pressure container for liquid-phase hydrogen reduction without being filtered and washed, wherein the temperature and pressure for the liquid-phase hydrogen reduction are controlled to be fixed values; performing liquid-solid separation and washing the solid after the reaction is performed for a fixed time; and drying the solid in a baking box and transferring the dried solid into a hydrogen reducing furnace for reduction at the temperature of between 300 and 500 DEG C for a certain time so as to obtain the superfine nickel powder. The method has the advantages that: the conventional high-temperature and high-pressure hydrogen reduction conditions are weakened by adopting a liquid-solid combined reduction method so as to make large-scale industrial production easy; and simultaneously, the noble metal consumption cost is reduced and the average particle diameter of the prepared superfine nickel powder is less than 2 microns because the noble metal ruthenium trichloride is used as an active agent in place of palladium chloride.

Description

technical field [0001] The invention belongs to the field of metal powder preparation, and relates to a method for producing ultrafine nickel powder through liquid phase-solid phase combined hydrogen reduction, in particular, adding a surfactant during reduction to provide a method for industrial production of ultrafine nickel powder. Background technique [0002] Due to its special properties, ultra-fine nickel powder is mainly used in diamond tools, hard alloys, electrical alloys, shielding materials, battery materials and other industries. It is an indispensable metal additive in powder metallurgy parts. [0003] The manufacture method of superfine nickel powder has been paid close attention to by people for a long time, and traditional nickel powder production method mainly contains four kinds: electrolytic method prepares nickel powder, carbonyl method prepares nickel powder, reduction method prepares nickel powder (comprising high-pressure hydrogen reduction, nickel oxa...

Claims

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Application Information

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IPC IPC(8): B22F9/26
Inventor 汪云华赵家春昝林寒李博捷
Owner KUNMING INST OF PRECIOUS METALS
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