how to separate silicon from sand
Jan 01, 2012· Besides manganese oxides and silica, the manganese ores normally also contain Al 2 O 3, CaO, and MgO. Coke ash also contains SiO 2, Al 2 O 3, and smaller amounts of CaO and MgO. In addition, CaO- and MgO-containing fluxes are usually added to the raw material mixture. These oxides will end up in the slag phase.