Incredibly superior purity silicon for semiconductors is attained using the Siemens approach; the silicon is reacted to make trichlorosilane, which happens to be first purified by distillation, then reacted with purified hydrogen on higher purity silicon rods at 1150 oC to generate superior purity, polycrystalline silicon with hydrochloric acid byproduct. https://kylerdyqja.weblogco.com/36690258/getting-my-ceramic-silicon-to-work