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Process for producing spherical submicron metal with hydro-thermal treatment

A technology of ultra-fine metal powder and hydrothermal treatment, which is applied in the field of metal powder material preparation to achieve the effects of low production cost, low reduction temperature, and uniform and fine particles

Inactive Publication Date: 2009-05-13
张建玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no disclosure or report of using this process to prepare ultrafine nickel powder and cobalt powder

Method used

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  • Process for producing spherical submicron metal with hydro-thermal treatment
  • Process for producing spherical submicron metal with hydro-thermal treatment
  • Process for producing spherical submicron metal with hydro-thermal treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Nickel sulfate was used as raw material and ammonium bicarbonate was used as precipitant to prepare superfine nickel powder. Add 150L of deionized water into stirring tank A, heat up to 55°C; weigh 50kg of industrial pure nickel sulfate, add it into stirring tank A, stir to dissolve nickel sulfate; then add dispersant polyethylene glycol 1200g, oleic acid 700g, And dilute the nickel sulfate aqueous solution to a volume of 210L. Add 145L of deionized water to the stirring tank B, heat up to 50°C, then add 30.3Kg of industrial pure ammonium bicarbonate, stir to dissolve it completely, and dilute to a volume of 205L aqueous solution (concentration is about 1.8mol / L). Add the nickel sulfate aqueous solution containing the dispersant rapidly (within 3 to 4 minutes) into the ammonium bicarbonate aqueous solution under stirring conditions, and continue to stir for 12 minutes; after standing for 6 hours, remove part of the supernatant by suction filtration. The remaining sedim...

Embodiment 2

[0055] The superfine nickel powder was prepared by using nickel oxide as raw material and sodium hydroxide as precipitant. Add 100L of deionized water into stirring tank A, and heat up to 50°C; weigh 14.5kg of nickel oxide (containing 76.3% nickel), add it into stirring tank A, and stir to wet the nickel oxide; the concentration of 100L is 245.4g / L Add the aqueous nitric acid solution in the stirring tank A, and keep stirring to dissolve the nickel oxide aqueous slurry. After the nickel oxide is dissolved, filter the nickel nitrate aqueous solution with a 400-mesh acid-resistant filter cloth to remove insoluble matter, and dilute the solution volume to 260L. Then add dispersant polyvinylpyrrolidone 2000g, Tween-80 600g. In the stirring tank B, first add 160L of deionized water, then slowly add 15.8kg of industrial pure sodium hydroxide, and stir to completely dissolve it. Add the nickel nitrate aqueous solution containing the dispersant into the sodium hydroxide aqueous solu...

Embodiment 3

[0058] Cobalt sulfate was used as raw material and oxalic acid was used as precipitant to prepare superfine cobalt powder. Add 150L of deionized water into stirring tank A, and heat up to 50°C; weigh 56.3kg of industrially pure cobalt sulfate, add it to stirring tank A, and stir to dissolve cobalt sulfate; then add dispersant polyvinyl alcohol 1100g, polypropylene glycol 800g, 300g of oleic acid, and dilute the cobalt sulfate aqueous solution to a volume of 220L. First add 220L of deionized water into the stirring tank B, then add 24.8Kg of industrial pure oxalic acid, stir and heat to 50°C to completely dissolve it, and dilute to a volume of 245L of aqueous solution. Add the cobalt sulfate aqueous solution containing the dispersant into the oxalic acid aqueous solution rapidly under the condition of stirring, and continue to stir for 14 minutes; after standing still for 6 hours, part of the supernatant is removed by suction filtration. The remaining sediment water slurry was...

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Abstract

The invention discloses a technological method for preparation of sphere-shaped ultrafine metallic powders through hydro-thermal treatment, which relates to a technological method for preparation of sphere-shaped ultrafine nickel powders or ultrafine cobalt powders through the procedures such as precipitation, dispersing agent surface finish, high-pressure hydro-thermal treatment, washing, drying and high-temperature hydrogen reduction and the like, and which belongs to the technical field for preparation of metal powder materials. The technological method adopts water soluble salts with nickel and cobalt, cobalt oxide, sub-carbonate, carbonate or hydroxide as raw materials, which are prepared into water solution after processing, the dispersing agent is added, then nickel ion and cobalt ion in the water solution are precipitated through alkali, carbonate, oxalic acid or ammonium oxalate and the like, the hydro-thermal treatment of water pulp of the precipitate is performed in an autoclave, and products of sphere-shaped ultrafine nickel powders or ultrafine cobalt powders with even graininess and good dispersibility can be obtained through washing, drying and high-temperature hydrogen reduction. The technological method is not only suitable for medium- and small-scale discontinuous-type manufacture, but also used for large-scale continuous manufacture, and the manufacturing cost is low.

Description

technical field [0001] A process method for preparing spherical ultrafine metal powder by hydrothermal treatment, involving the process of preparing spherical ultrafine nickel powder or ultrafine cobalt powder by adopting processes such as precipitation, dispersant surface modification, high-pressure hydrothermal treatment, washing, drying, and high-temperature hydrogen reduction The invention belongs to the technical field of metal powder material preparation. technical background [0002] Ultrafine nickel powder or ultrafine cobalt powder (hereinafter referred to as ultrafine nickel powder, cobalt powder) has special physical and chemical properties, and has great surface effect and volume effect. With the development of science and technology, the performance requirements of powder materials in different application fields are constantly improving. Ultrafine nickel powder and cobalt powder have gradually replaced conventional nickel powder and cobalt powder. Ultrafine ni...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00
Inventor 张建玲
Owner 张建玲
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