reactions. Calcium phosphate (phosphate rock) is heated to 1,200-1,500 °C with sand, which is mostly , and coke (impure carbon) to produce . The chemical equation for this process when starting with fluoroapatite, a common phosphate mineral, is:

: 4 + 18 + 30 C -> 3 + 30 CO + 18 + 2

Of historic interest is the Leblanc process. A key step in this process is the reduction of sodium sulfate

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