Explanation

Also called furnace or melting, the melt formed by impurities and flux during pyrometallurgy is lighter than liquid metal and thus floats above the metal surface. It is mainly composed of oxides, and often contains sulfides and carries a small amount of metal. During smelting, by controlling the composition and properties of slag, the products of gangue and oxidized impurities can be separated from the molten metal or matte smoothly, so as to remove harmful impurities in the metal, absorb non-metallic inclusions in the liquid metal, protect the liquid metal from being directly contaminated by furnace gas, and enrich useful metal oxides. In addition, the furnace is also a resistance heating element in electric furnace smelting. Slag plays a decisive role in ensuring the smooth operation of smelting, the quality of smelting products, and the metal recovery rate. Many slag also have important uses, such as blast furnace slag can be used as raw material for cement, high phosphorus slag can be used as fertilizer, and slag containing vanadium and titanium can be used as raw material for extracting vanadium and titanium.

Classification