Reduction behaviour of rice husk ash for preparation of high purity silicon

The reduction of rice husk ash (RHA) silica for the preparation of high purity silicon was studied using magnesium as the reducing agent. Composite magnesium–RHA pellets with magnesium content varying 0–25 wt-% in excess of stoichiometry requirement were made and heated in the temperature range of 600–900°C under flowing argon. It was found through differential thermal analysis and temperature profile recording that the reaction of RHA silica …