Kinetics of extracting phosphoric acid and sulfuric acid in composite system

In order to deeply understand the mechanism and dynamic characteristics under the extraction process,the extraction kinetics of phosphoric acid and sulfuric acid was investigated by using constant-interface cell in the composite system.The effects of specific interfacial area,the concentration of phosphoric acid in the optimum extraction conditions and the concentration of sulfuric acid in the optimum extraction conditions on the extraction rate of phosphoric acid and sulfuric acid were reviewed.The kinetic equation of the extraction of phosphoric acid and sulfuric acid was put forward in the sulfuric acid-phosphoric acid system at 60 ℃.The results show that the extraction rate of phosphoric acid and sulfuric acid decreases with the increase of specific interfacial area,and increases with the increase of the initial concentration of phosphate in the aqueous phase gradually.With increasing the initial concentration of sulfuric acid in the aqueous phase,the extraction rate of phosphate is improved.The raw industrial phosphoric acid was used to verify the acid extraction kinetics.The result reveals that the extraction rates of the calculated values agree with the measured values of sulfuric acid and phosphoric acid.