Study on mathematical model of phosphate rock acidulated by phosphoric acid

Shangsuan phosphate rock of Yunnan province was acidulated by the phosphoric acid about 20% P\-2O\-5 producted by hotprocess. Under the experimental condition, the coatforming character of product Ca(H\-2PO\-4)\-2 on the phosphate rock was analysed with the scanning electronmicroscope. This process can be described by the shrinking core model with the same diameter. A mathematical model for the process was derived, also a model from experimental data was obtained.