General Principles And Processes Of Isolation Of Elements

A mixture of and in the ratio of is called thermite and is used in thermite welding
Thus, is used in thermite welding

During electrolytic refining of copper, impurities of silver , gold , platinum , selenium being less electropositive are not affected by electrolytic solution of acidified copper sulphate. Thus, these settle down under the anode as anode mud or anode sludge