Keywords: aluminum, antimony, arsenic, As, bauxite, boron, byproduct, calcium, carbon, carbon monoxide, charcoal, chromium, CO, cobalt, coke, copper, cubic, electrode, fluidized bed, furnace, Ga, gallium, gallium arsenide, gold, inert gas, iron, lead, magnesium, manganese, mercury, molybdenum, monosilane, nickel, oxygen, phosphorous, polysilicon, purification, quartz, rhombohedral, sand, Seimens, semiconductor, Si, silicate, silicon, silicon tetrachloride, siver, slim rod, sublime, synthesis, titanium, vanadium, vapor pressure, zirconium, zone refining