Research on the removal of metal impurities from Wet-Process Phosphoric Acid with duolite

The removal rate of metal impurities in Wet-Process Phosphoric Acid with 732 strong-acid cation exchange resin was researched.Some important factors which affect the removal rate of metal impurities such as the stirring speed,the temperature,the mass ratio of duolite to Phosphoric Acid,the reaction time were studied respectively.The results show that the removal efficiency of iron,aluminum,magnesium,calcium can be up to 66.21%,85.87%,89.76%,93.29%,respectively,when the stirring speed was 400 r/min,the temperature was 30 ℃,the mass ratio of doulite to Phosphoric Acid was 9∶10,the reaction time was 5 min.