"Salt cake is a by product in the aluminium recycling process using a rotary furnace. Salt cake is a mixture of aluminum oxides and aluminum nitrides, metal and salts (mainly NaCl and KCl, with small amounts of MgCl2 and CaCl2).The salt cake is a growing environmental problem. It is proving very difficult to dispose in the Europe and is regarded as hazardous waste. The reason is that when saltcak ...