Melemo le melemo ea ho kopanya tšepe e tšoeu ea jade le corundum e sootho e kopantsoeng:

Thepa e tala e thehiloeng ho corundum e entsoeng ka mokhoa o fused corundum e na le litaba tse ngata tsa alumina. Lithollo tsa corundum li felletse ebile li mahoashe. Botsitso bo phahameng ba lik’hemik’hale, alumina ea boemo bo holimo kapa clinker ea alumina e phahameng e sebelisoa e le lisebelisoa tse tala ho qhibiliha ho arc Shanghai, ho tlosa thepa e setseng, le ho pholisa frit. Ho na le mefuta e ‘meli ea mantlha ea corundum e sootho e kopantsoeng le corundum e tšoeu e kopantsoeng. Ha alumina bauxite e phahameng e sebelisoa ho hlahisa corundum e sootho, alumina bauxite e phahameng e hloka ho chesoa pele ho electrofusion ho tlosa metsi a adsorbed le metsi a sebopeho ho eona ho potlakisa ts’ebetso ea electrofusion le ho fokotsa tšebeliso ea matla. E le ho fokotsa ka botlalo ts’ebetso ea ho kopanya le ho tlosa litšila ka katleho, hoa hlokahala ho eketsa palo e loketseng ea anthracite le phofo ea tšepe lihlahisoa tse tala. Ha alumina e hlahisa corundum e tšoeu, ka lebaka la bohloeki bo phahameng ba lihlahisoa tse tala, ha ho hlokahale ho sebelisa mekhoa ea ho fokotsa ho arola litšila. Likahare tsa alumina tsa alumina e sootho e kopantsoeng e kholo ho feta 90%, ‘me litaba tsa alumina tsa alumina e tšoeu e kopantsoeng li feta 98%. Ts’ebetso ea “fused corundum” ha e le hantle e ts’oana le ea sintered alumina, empa corundum e ‘ngoe e na le porosity e hlakileng.