Effect of impurities on extraction of phosphoric acid

Some relationships are studied among the phase ratio, extraction efficiency and separation coefficients, and the influences of 2 impurities SO_4~(2)and Fe~(3+)on extraction efficiency of phosphoric acid are discussed. The experimental results show that the extraction efficiency of phosphoric acid and the separation coefficients of impurities rise with the increasing phase ratio; the impurity H_2SO_4 is positive to the extraction of phosphoric acid under an optimum amount of H_2SO_4, with the maximum separation coefficient between the phosphoric acid and sulfuric acid; meanwhile the impurity Fe~(3+)is negative.