MetallurgyMedium

Question

An ore after levigation is found to have basic impurities. Which of the following can be used as flux during smelting ?

Options

A.H2SO4
B.CaCO3
C.SiO2
D.Both CaO and SiO2.

Solution

Acidic flux is used. It is an acidic oxide (oxide of a non-metal) like SiO2, P2O5, B2O3 (from borax). It is used to remove the basic impurity like CaO, FeO, MgO etc. The acidic flux combines with the basic impurity and forms a slag.

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