| http://www.w3.org/ns/prov#value | - Production may be effected in a two-step process in which rice hulls are coked by heating in the absence of air at a relatively low temperature, e.g. at 700??? C., in order to decompose the cellulose into amorphous carbon, and the thus coked rice hulls are heated at a high temperature, e.g. at a temperature of greater than 1500??? C. and in an inert or reducing atmosphere to produce silicon carbid
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