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Method for preparing amorphous raney nickel

A skeleton nickel, amorphous technology, applied in the field of powder metallurgy, can solve the problems of large amount of catalytic material, low bonding strength, and few effective reaction times, etc.

Inactive Publication Date: 2009-09-23
YUNNAN TIN GROUP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage of this supported amorphous alloy is: use expensive rare metal palladium; when ionic palladium is chemically reduced on the substrate, the bonding strength of metal palladium and the substrate is low, and the number of effective reactions is small in the catalytic reaction. , so the amount of catalytic material per unit product is large

Method used

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  • Method for preparing amorphous raney nickel
  • Method for preparing amorphous raney nickel
  • Method for preparing amorphous raney nickel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Accurately weigh metal nickel and aluminum according to the mass ratio of nickel: aluminum = 1:1, add them to the intermediate frequency induction furnace, melt them to 1400°C, pour them into the intermediate frequency heat preservation leakage bag that has been heated to 1200-1400°C, pass through 0.6Mpa, the nozzle angle The water-containing alloy powder is obtained by 38° high-pressure gas atomization and rotary disc centrifugal secondary atomization with a rotating speed of 4000 rpm, and then dried and sieved. The yield of -30 mesh product is 50%. Return to the intermediate frequency furnace to melt.

[0017] Activation process: Accurately weigh the nickel-aluminum alloy powder intermediate, calculate the amount of alkali based on 1 times the amount of alkali consumed by the aluminum in the nickel-aluminum alloy powder intermediate, and add the nickel-aluminum alloy powder: lye to the reaction kettle at a ratio of 1:5 , control the reaction temperature to 50°C, react...

Embodiment 2

[0018] Embodiment 2 Accurately weigh metal nickel and aluminum according to the mass ratio of nickel: aluminum = 1: 1 and add them to an intermediate frequency induction furnace, melt to 1500°C, pour them into an intermediate frequency heat preservation leakage bag that has been heated to 1350°C, and through 0.7Mpa, the nozzle High-pressure gas atomization at an angle of 40° and rotating disc centrifugal secondary atomization with a rotating speed of 4000 rpm to obtain water-containing alloy powder, then dried and sieved, the yield of -30 mesh product was 56%, and the oversize Return to the intermediate frequency furnace for melting.

[0019] Activation process: Accurately weigh the nickel-aluminum alloy powder intermediate, calculate the amount of alkali based on 1.5 times the amount of alkali consumed by the aluminum in the nickel-aluminum alloy powder intermediate, and add the nickel-aluminum alloy powder: lye to the reaction kettle at a ratio of 1:6 , control the reaction ...

Embodiment 3

[0020] Embodiment 3 Accurately weigh metallic nickel and aluminum according to the mass ratio of nickel: aluminum = 1: 1 and add them to an intermediate frequency induction furnace, melt to 1600°C, pour them into an intermediate frequency heat preservation leakage bag that has been heated to 1350°C, and pass through 0.8Mpa, the nozzle High-pressure gas atomization with an angle of 44° and rotary disc centrifugal secondary atomization with a rotating speed of 4000 rpm to obtain water-containing alloy powder, then dried and sieved, the yield of -30 mesh product is 65%, and the sieve The material is returned to the intermediate frequency furnace for melting.

[0021] Activation process: Accurately weigh the nickel-aluminum alloy powder intermediate, calculate the amount of alkali based on twice the amount of alkali consumed by the aluminum in the nickel-aluminum alloy powder intermediate, and add the nickel-aluminum alloy powder: lye to the reaction kettle at a ratio of 1:8 , con...

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Abstract

The invention provides a method for preparing amorphous raney nickel. The invention relates to the technical field of metallurgy, in particular to a method for preparing amorphous raney nickel as a catalyst. The method comprises the following processing steps: mixing and melting nickel and aluminum; leaking the obtained product from a discharge spout under a heat-preservation stopper ladle; performing continuous multi-stage atomization treatment of gas atomization and centrifugal atomization; ensuring that the cooling solidification speed is between 10<5> K / s and 10<6> K / s; obtaining, drying and sieving hydrous alloy powder; extracting undersize substances by use of alkaline solution; washing the extracted undersize substances to remove residual alkali; and obtaining the amorphous raney nickel. The alloy powder prepared by the method has the characteristics of high strength, uniform components and no segregation, and has high catalytic property and specificity.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing catalyst amorphous framework nickel. Background technique [0002] Amorphous skeleton nickel, also known as amorphous Raney nickel, is a nickel-aluminum alloy powder with moderate activity and skeleton structure. It is used in catalytic hydrogenation, oxidative desulfurization and other fields in organic synthesis. At present, the catalysts used for catalytic hydrogenation include noble metals, nickel aluminum, and amorphous framework nickel. The catalytic performance of amorphous framework nickel is better than that of nickel aluminum, which is an ideal substitute for noble metal catalysts. Compared with traditional precious metals, such as palladium and rhodium, it has the advantages of low price and easy preparation, and has the same high efficiency and specificity. Due to its moderate activity, it is often stored in organic solvents or wate...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 王怀兴朱华明卢色桦
Owner YUNNAN TIN GROUP HLDG