วัตถุดิบสำหรับการถลุงซิลิคอนอุตสาหกรรม

The raw materials for smelting industrial silicon are mainly silica and carbonaceous reducing agents. Due to the strict restrictions on the content of aluminum, calcium and iron in industrial silicon, the requirements for raw materials are also very strict. In silica, SiO2>99.0 เปอร์เซ็นต์ , Al2O3<0.3%,><0.15%,><0.2%,><0.15%; the="" particle="" size="" is="" 15-80mm.="" the="" principle="" of="" selecting="" carbonaceous="" reducing="" agent="" is:="" high="" fixed="" carbon,="" low="" ash="" content="" and="" good="" chemical="" activity.="" usually,="" low="" ash="" petroleum="" coke="" or="" pitch="" coke="" is="" used="" as="" the="" reducing="" agent.="" however,="" due="" to="" the="" low="" resistivity="" and="" poor="" reaction="" ability="" of="" these="" two="" kinds="" of="" coke,="" it="" is="" necessary="" to="" replace="" part="" of="" the="" petroleum="" coke="" with="" charcoal="" (or="" wood="" block)="" with="" low="" ash="" content,="" high="" resistivity="" and="" strong="" reaction="" ability.="" in="" order="" to="" sinter="" the="" charge,="" some="" low-ash="" bituminous="" coal="" should="" also="" be="" added.="" it="" must="" be="" pointed="" out="" that="" using="" too="" much="" or="" all="" charcoal="" will="" not="" only="" increase="" the="" cost="" of="" the="" product,="" but="" also="" make="" the="" furnace="" condition="" disorder.="" ,="" difficulty="" in="" tapping,="">