What is flux and its types
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Meghna Thapar 5 years, 4 months ago
Flux:
It is the substance added to molten metals to bond with impurities that can be readily removed.
Types of flux:
Fluxes are of two types, viz, acidic flux and basic flux.
(a) Acidic flux: It is an acidic oxide (oxide of a non-metal) like SiO2, P2O5, B2O3 (from borax). It is used to remove basic impurities like CaO, FeO, MgO etc. The acidic flux combines with a basic impurity to form a slag.
(b) Basic flux: It is a basic oxide (i.e. oxide of a metal) like CaO (obtained from limestone, CaCO3), MgO (from magnesite. MgCO3), haematite (Fe2O3) etc. It is used to remove acidic impurities like SiO2, P2O5 etc. The basic flux combines with an acidic impurity to form a slag.
Thus, slag can be defined as a fusible mass, which is obtained when a flux reacts with an infusible, acidic or basic impurity present in the oxide ore.
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