Study on Phosphorus Removal from Baotou Minerals Calcined by CaO Acid Washed in HCl-H_3Ait

Citric acid was an organic ternary weak acid,and in this paper,the citic acid coordinated with metal cation was used to make the phosphorus remove from the products of baotou minerals calcined by CaO easily.The products of baotou minerals calcined by CaO leached in HCl-H3cit solution,and the relationship among the ratio of phosphorus removal,HCl acid concentration,H3cit concentration,temperature,liquid to solid,time and stirring rate was studied by the quadratic regression orthogonal analysis,and then the regression equation was obtained.The optimum process conditions of phosphorus recovery were obtained as follows:HCl concentration:0.5 mol·L-1,citric acid concentration:0.05mol·L-1,temperature:room temperature,ratio of liquid to solid :10∶1,time:20min and stirring rate:250r/min,the ratio of phosphorus removal:99.5%.