phosphoric acid, which contains about 54-62% {{chem2 (75-85% ). Further removal of water yields superphosphoric acid with a concentration above 70% (corresponding to nearly 100% ). The phosphoric acid from both processes may be further purified by removing compounds of arsenic and other potentially toxic impurities.

Dry process

To produce food-grade phosphoric acid, phosphate ore is first reduced with coke in an electric arc furnace,

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