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Application of pretreatment technology for phosphate rock in production of WPA

Before acid decomposition, phosphate rock can be pretreated by wetprocess phosphoric acid to remove the part of impurities such as iron, aluminium and magnesium. The pretreatment will decrease sulfuric acid consumption by 400～600 kg/t P 2O 5 in phosphoric acid extract section and increase the capacity by 30%～50% in phosphoric acid extract and filtration systems.