A kind of preparation method of ultrafine high-purity rhenium powder
A technology of rhenium powder and pure rhenium, which is applied in the field of preparation of ultra-fine high-purity rhenium powder, which can solve the problems of coarse particle size of rhenium powder, poor formability, and decreased purity of rhenium metal, and achieve the effect of uniform particle size and improved purity
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[0045] The embodiment of the present application provides a method for preparing ultrafine and high-purity rhenium powder, which includes: pre-grinding the rhenium powder with a grinding ball and a ball-milling tank at a first ball-milling speed, until the particle size of the rhenium powder reaches 25 μm≤D90≤40 μm , and then ball-mill the rhenium powder at a second ball-milling speed lower than the first ball-milling speed.
[0046] Since the traditional ball milling process is easy to introduce impurities, the inventor of the present application proposes to improve the ball milling equipment. In the present application, the inventors have studied the material of the ball mill equipment and found that the ball mill equipment is usually made of agate, stainless steel, zirconia and other materials, but due to the high hardness of rhenium powder, the wear resistance of alumina is poorer than that of alumina, and it is used for a period of time. It is easy to introduce aluminum i...
Embodiment 1
[0062] The present embodiment provides a method for preparing ultrafine high-purity rhenium powder, comprising:
[0063] Using 99.99% high-purity reduced rhenium powder as raw material, D90 is 151μm.
[0064] The rhenium powder was processed by high-energy ball milling, and 200g of rhenium powder, 1000g of rhenium-plated tungsten carbide balls, and 30g of absolute ethanol were added to the rhenium-coated tungsten carbide ball mill jar, and then ball-milled at a speed of 300r / min for 5 minutes to make the rhenium Grind until D90 is 30μm, and then use 200r / min ball milling for 30 minutes.
[0065] Take out the rhenium powder and separate the grinding ball and the rhenium powder with a sieve, bake in an oven at 100 °C for 8 hours, crush the dried rhenium powder with a shovel, and keep it in a hydrogen four-tube furnace with a holding temperature of 400 °C for 4 hours.
[0066] The particle size distribution of the raw rhenium powder and the rhenium powder after ball milling was ...
Embodiment 2
[0075] The present embodiment provides a method for preparing ultrafine high-purity rhenium powder, comprising:
[0076] Using 99.99% high-purity reduced rhenium powder as raw material, D90 is 77.7μm.
[0077] The rhenium powder was processed by high-energy ball milling, and 400g of rhenium powder, 1000g of rhenium-plated tungsten carbide balls, and 70g of absolute ethanol were added to the rhenium-plated tungsten carbide ball mill jar, and then ball-milled at 300r / min for 5 minutes to make the rhenium Grind until D90 is 25μm, and then use 180r / min ball milling for 25 minutes.
[0078]Take out the rhenium powder, filter the grinding ball and the rhenium powder with a screen, bake in an oven at 100 °C for 10 hours, crush the dried rhenium powder with a shovel, and keep it in a hydrogen four-tube furnace with a holding temperature of 450 °C for 6 hours.
[0079] The particle size distribution of raw rhenium powder and rhenium powder after ball milling was detected by laser part...
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Abstract
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