question_answer

In the metallurgy of zinc, the zinc dust obtained from roasting and reduction of zinc sulphide contains some ZnO. How is this removed [MP PET 1993; AFMC 2002]

A) Absorbance of ultraviolet light and re-emission of white light is employed

B) Shock cooling by contact with a shower of molten lead is done

C) X-ray method is used

D) Smelting is employed