Alumina yumbu rufin rufin tukwane na musamman na corundum da aka yi da Al2O3 a matsayin babban albarkatun ƙasa, ƙarancin ƙarfe oxides azaman juyi, kuma ana harba shi a babban zafin jiki na digiri 1,700.Tile yumbu mai jure sawa yana da laƙabi da yawa saboda yankuna da ɗabi'u daban-daban, kamar zanen yumbu, lining, al ...
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