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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

10001674

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.

19760101

IH; Report of Investigations

1976

PB-258115

A03

RI 8157

PRC;

NTIS: PB 258 115