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The Reactivity of Aluminized AN-FO With Pyrite-Bearing Ores.

Miron Y; Mason CM; Watson RW
NTIS: PB 258 115 :25 pages
Previous studies at the Bureau of Mines outlined the hazards of ammonium nitrate-fuel oil (AN-FO) mixtures in the presence of pyrite- bearing ores. The recent trend in the mining industry to strengthen AN-FO by the addition of aluminum metal raised the question regarding the effect of aluminum in AN-FO in the presence of pyrite- bearing ore. Laboratory work, similar to that done previously, demonstrated that the temperature of a self-sustaining reaction in the presence of AN-FO ore-aluminum is not lower than that for a comparable AN-FO-ore mixture. However, as might be expected from known thermochemical data, once initiated, the resulting reactions between AN-FO, aluminum, and pyrite are much more vigorous than those observed for AN-FO and pyrites alone. The temperature required to produce a self-sustained reaction for the combinations tested in this study is 250 deg +- 20 deg f while in the previous Bureau study, reactions were noted, in some instances, at 150 deg f. The different pyritic ores may be the cause of this variation.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 8157
NIOSH Division
Source Name
NTIS: PB 258 115
Page last reviewed: October 29, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division