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Thomas slag refers to which of the following substances?

1. Calcium phosphate, Ca3(PO4)2
2. Calcium silicate, CaSiO3
3. A combination of calcium phosphate and calcium silicate
4. Iron silicate, FeSiO3

Correct answer: Calcium phosphate, Ca3(PO4)2

Solution

Thomas slag, formed in the basic Bessemer process, is mainly calcium phosphate Ca3(PO4)2 and is used as a phosphatic fertilizer.

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