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Phosphoric acid is a major industrial chemical. It follows sulfuric and nitric acids in importance and tonnage produced. Phosphoric acid is supplied commercially as merchant grade, technical grade, superphosphoric acid grade, and food grade. Merchant grade is 40–60% acid concentration and may contain chloride and fluoride ions. Technical grade is defined as >85% acid concentration. Superphosphoric acid is 105% acid concentration. Food grade is 75–85% acid concentration and contains <15 ppm chloride and <1 ppm fluoride.
CONTINUE READING ON:Alloy selection in wet-process phosphoric acid
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