Preparing silane compound or its mixture, comprises grinding pieces of silicide or silicon alloy to

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A process for preparing a compound or a mixture of compounds of formula if H wherein n is an integer greater than or equal to 1 and less than or equal to 3, comprising the following successive steps : a) crushing of pieces of at least one of a silicide or silicon alloy of formula m wherein m is M if a reducing metal, M an alkali metal or alkaline earth metal, X, and vary from 0 to 1, 0 and z being different from the sum x+y different from 0, to form a powder, the particles have a diameter of between 10 μm and 500 μm; b) introduction of the alloy powder obtained in step a) into a reactor; c) introducing hydrogen under pressure into the reaction vessel; d) reaction of the reagents introduced in steps b) and c) in the reactor.