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Molten Aluminum-Water Explosion Initiation Mechanism Study.

Authors
Nusbaum-MS
Source
NIOSH 1975 Sep:256 pages
Link
NIOSHTIC No.
00083482
Abstract
Molten aluminum (7429905) bleed outs occurring during direct chill (DC) operations which result in explosions of varying degrees of severity when the aluminum flows into the quenching water used in the chill process are reviewed. Those aspects of the interaction which led to explosions were studied to identify initiation mechanisms which were consistent with commercial experience, and would account for the randomness with which explosions occurred. The most probable initiation mechanism has been identified as spontaneous nucleation of liquid quench water contained in quench pit surface capillaries. The molten aluminum is separated from this liquid water by a vapor film which must be collapsed to provide intimate contact between molten aluminum and liquid water. The most probable and most frequent trigger mechanism producing the required contact has been identified as an impact generated shock, which is produced by the aluminum flow over quench pit surface. Current aluminum industry safety practices which emphasize the elimination of the surface cavities which trap the liquid water required for initiation of the explosion are supported.
Keywords
Contract-099-73-0027; NIOSH-Publication; Explosion-prevention; Industrial-processes; Safety-practices; Metal-industry; Light-metals;
CAS No.
7429-90-5;
Publication Date
19750901
Funding Type
Contract;
Fiscal Year
1975
NTIS Accession No.
PB80-191794
NTIS Price
A13
Identifying No.
Contract-099-73-0027
Source Name
NIOSH, Cincinnati, Ohio, Final Report
State
OH;
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