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.
Which method of metal refining is generally used when a metal of high degree of purity is needed?
Ultra pure silicon is needed by electronic industry. By which method of refining, such a high purity silicon is obtained?
What is the major role of fluorospar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite?