Notes

Slag …

Slag – Glass like compound duced during the extraction of metals (smelting and refining) when the impurities in an ore react with a flux. For example, in blast furnance the flux used is limestone (CaCO₃) and the main impurity silica (SiO₂). The slag formed in mainly calcium silicate :
CaCO₃ + SiOCaSiO₃ + CO₂.

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