Setene sa silika

Silica setene ke setene se chesitsoeng se entsoeng ka mullite (3Al2O3.2SiO2) le silicon carbide (SiC) e le liminerale tse ka sehloohong. Litšobotsi tsa eona ha se feela ts’oaetso e phahameng ea mocheso oa mullite, empa le ts’ireletso ea ts’ireletso, ts’enyeho ea ts’enyeho, le ts’ebetso e ntle ea mocheso oa silicon carbide. Ha Baosteel e ne e hahuoa lilemong tsa bo-1980, thepa e qhekellang e hlahisitsoeng ho tsoa Nippon Steel, e neng e shebahala joalo ka litanka tsa torpedo, e ne e ts’oana le litene tsa sejoale-joale tse bopehileng ka silicon. Ebile, ke sesebelisoa se fetotsoeng sa lihlahisoa tsa aluminium silicate. Lisebelisoa tsa mantlha tsa ladle la tšepe ke litene tse sa emeng haholo tse entsoeng ka aluminium e phahameng. Tsoelo-peleng ea mahlale a indasteri ea tšepe le tšepe, e le ho akofisa lebelo la ho etsa tšepe, palo e itseng ea Calcium oxide (CaO) e feta se bitsoang pele ho kalafo. Ka tsela ena, thepa e hanyetsang e ka tankeng e tlameha ho mamella ts’enyeho ea mocheso o phahameng oa tšepe e qhibilihisitsoeng le ho hanela ts’enyeho e matla ea alkaline. Ho hlakile hore thepa ea aluminium e phahameng e ke ke ea e mamella, ka hona ho eketsa palo e nepahetseng ea silicon carbide ho thepa ea aluminium e phahameng e theha mefuta e mecha. Indasteri ea metallurgical e e bitsa setene sa aluminium se kopantsoeng le silicon carbide.

Ts’ebetso ea setene sa silicon carbide e tsoa ts’ebetsong ea eona. Pele, ho hlokahala hore ho khetha e khethehileng sehlopheng ea alumina le Al2O3 phahame ho feta 80% ka lintho tse bonahalang e tala. Silicon carbide e lokela ho hloeka ‘me tlhokahalo ea thatafalo ea Mohs e haufi le 9.5. Khetho ea k’hamphani ea silicon carbide e thata haholo. Mofuta ona oa diminerale o sa tloaelehang haholo. Boholo ba lihlahisoa li sebelisa SiO2 le C ho kopanya SiC ka mocheso o phahameng seboping sa motlakase. Lisebelisoa tse fapaneng tse tala li tla hlahisa liphapang tsa boleng. Hajoale, ts’ebetsong ea SiC, SiO2 ea lihlahisoa tse tala e tsoa silika ea tlhaho, ‘me C e tsoa ho coke ea mashala le mashala. Petrolium coke, ho latela liphetho tsa rona tsa lipatlisiso, silicon carbide e kopantsoeng le coke ea peterole le SiO2 e na le matšoao a phahameng ho latela ho thatafala le ho roala, ‘me e loketse ho sebelisoa joalo ka litene tsa silicon carbide. Mekhahlelo e meholo ea kristale ea litene tse chesitsoeng e entsoeng ka lisebelisoa tsena tse tala ke mullite, silicon carbide le corundum. Liminerale tsena li na le thatafalo e phahameng, e ralileng motheo oa lihlahisoa tse teteaneng le tse matla tse matlafatsang.