Magnesium oxides; Chemicals for industrial use, namely, alkaline chemicals for adjusting pH, alkaline chemicals for precipitating other materials, alkaline chemicals for the production of magnesium compounds, construction materials, metal and alloys, alkaline chemicals for the production of refractories and ceramics; Chemicals for industrial use, namely, magnesium oxides for adjusting pH, magnesium oxides for precipitating other materials, magnesium oxides for the production of magnesium comp...