Pb which is present as impurity in silver is removed by

When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO . The flux added to form slag is

How are these impurities removed ?

In contact process impurities of arsenic is removed by

Lead obtained form galena (PbS) by air reduction or carbon reduction process contains base metal (Cu, Bi, Sn, As) as impurities, due to the which lead becomes hard and brittle. Zn-Ag alloy formed in the upper layer of molten lead is skimmed off from the surface of the molten lead by perforated ladles. This alloy contains lead as impurity. This impurity of Pb is removed by

How is galena (PbS) present as impurity removed from the ore of zinc blende?

Which metal is not present in german silver

During the process of electrolytic refining of copper some metals present as impurity settle as 'anode mud'. These are

Which is a common impurity in 2,4,5-T