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nature : also known as WPA. Sulfuric acid and other inorganic acid phosphate rock processing system of phosphoric acid. The purity and concentration than the thermal phosphoric acid lower. Preparation key for the high concentration of phosphate and phosphoric compound fertilizers. Often concentrated sulfuric acid phosphate rock processing and decomposition of calcium phosphate and sulfate, and then filter and purify derived. WPA production process large general to generate the crystallization of calcium sulfate and form into dihydrate (CaSO4 2H2O) process, semi-water (which CaSO4 1 / 2H2O) processes and Anhydrous (CaSO4) flow, and so on.
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