How many metals are commercially extracted by pyrometallurgy from the given metal?Cu, Fe, Sn, Au, K, Na

The method of pyrometallurgy, extraction and purification of metals by processes involves the application of heat. The most important of this method are roasting, smelting, and refining. Roasting, or heating in air without fusion, transforms sulfide ores into oxides, Cu, Fe, Sn