Treatment, processing, finishing and preparation of chemicals for use in industry, chemical intermediates for use in industry and in manufacture, industrial minerals, mineral preparations for use in manufacturing, minerals in powder form for industrial use, mineral fillers for use in industry, inorganic chemical compounds, industrial inorganic chemicals, cryolite, synthetic cryolite, sulphuric acid, colloidal silica, siliceous ooze, silica gel, synthetic silica, silicon, silicates, calcium su...