Phosphorus reaction with silicides

EXPLOSION and FIRE CONCERNS nonflammable NFPA rating (NA) reacts violently or explosively upon heating when mixed with aluminum powder will ignite at high temperatures when mixed with phosphorus mixtures with diazomethane vapor can result in an explosive exothermic reaction when primed at a high temperature with a potassium nitrate-calcium silicide mixture, mixtures with excess red phosphorus will bum containers may explode when heated toxic fumes of oxides of sulfur are emitted when heated to decomposition use water spray, dry chemical, carbon dioxide, fog, or regular foam for firefighting purposes. 

Metals in a finely divided state bum spontaneously in chlorine. Solid metals (nonpow-dered form) bum spontaneously at elevated temperatures. Metal carbides react with chlorine with incandescence. Metal hydrides bum spontaneously in chlorine. Diborane explodes with chlorine at ordinary temperature silane, phosphine, arsine, or stibine produce a flame. The latter compounds react explosively with chlorine at elevated temperatures. Metal sulfides, silicides, nitrides, phosphides, and oxides bum in chlorine. Phosphorus undergoes a highly exothermic reaction with chlorine. White phosphorus explodes with liquid chlorine white phosphorus and finely divided red phosphorus bum spontaneously in chlorine gas with a pale green light (NFPA 1997). 

Barium sulphate is not a strong oxidant yet it can give rise to a very violent thermite reaction when it is heated in the presence of a very electropositive metal. This applies to aluminium for which an accident was described. In addition, there was an accident which involved a mixture of this sulphate with red phosphorus although the latter had been previously treated with potassium nitrate and calcium silicide. 

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