Production of non-explosive fine metallic powders

Details Production of non-explosive fine metallic powders Production of non-explosive fine metallic powders

1993-02-04

1994-08-16

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

75354, 149110, 501100, 501108, C04B 3502

Patent

active

053387120

ABSTRACT:
A process for producing a substantially non-explosive powder containing finely divided metallic particles suitable for being incorporated in a refractory mixture, comprising simultaneously grinding a mixture of pieces of metal with pieces of an inert refractory material to produce a premixture containing finely divided metallic particles and finely divided refractory particles which are intimately mixed together. The refractory particles are present in such particle sizes and quantities as ensure that the Minimum Explosible Concentration, as tested in a 20-L vessel with a chemical igniter, is greater than 100 gm/m.sup.3. The inert particles comprise at least 40% of the mixture, and preferably 50% to 75%. The invention also includes a premixed powder, produced by this process, especially as contained in drums or impermeable bags.

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patent: 4557884 (1985-12-01), Petrak et al.
Paper "Explosibility of Metal Powders" by Murray Jacobson, Austin R. Cooper, and John Nagy; (pp. 7 and 8), Mar. 1964.
U.S. Dept. of the Interior; Bureau of Mines, Oct. 1943 Report of Investigations, "Inflammability and Explosibility of Metal Powders" by Irving Hartmann, John Nagy and Hylton R. Brown, (pp. 27 and 28), Oct. 1943.
Database WPI. Derwent Publications Ltd., London, GB, AN 80-03355c & SU, A, 659 601 (Alum Magn electr Ind) May 29, 1979. See abstract.
Patent Abstracts of Japan, vol. 12 No. 332 (M-738) Sep. 1988, & JP S, 63 096 201 (Kurosaki Refract Co. Ltd.) Apr. 27, 1988.

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