Question

(i) Write the principle involved in the vapour phase refining of metals.

(ii) Write the name of the metal refined by each of the following processes:

(a) Mond process

(b) van Arkel method

(iii) What is the role of depressant in froth floatation process?

Answer 1

(i) The metal is converted into its volatile compound and collected elsewhere.It is than decomposed to get the pure metal.

(ii) (a) Ni

(b) Ti/Zr

(iii) It is used to separate two sulphide ores by preventing one to from froth