In the metallurgy of Iron, basic fluxes are added to react with native acidic impurities. However, some ores contain Phosphorus pentoxide () as a major acidic impurity. When a basic lime flux () is ad

Question

In the metallurgy of Iron, basic fluxes are added to react with native acidic impurities. However, some ores contain Phosphorus pentoxide ($P_4O_{10}$) as a major acidic impurity. When a basic lime flux ($CaO$) is added, a specific compound known as "Thomas Slag" is formed. What is the chemical formula of Thomas Slag?

Prashant Kotian · Accepted Answer

Correct answer: C. Phosphorus impurity oxidizes to . To remove this acidic oxide, a basic flux like is used. They react to form Calcium phosphate, , which is historically and industrially referred to as Thomas slag, heavily used as an agricultural fertilizer.

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