Which method of metal refining is generally used when a metal of high degree of purity is needed?
How does NaCN act as a depressant in preventive ZnS from forming the froth?
NaCN forms a layer of Zinc complex, Na2Zn(CN)4 on the surface of ZnS and thereby prevents it from the formation of froth.
What is the major role of fluorospar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite?
Ultra pure silicon is needed by electronic industry. By which method of refining, such a high purity silicon is obtained?