Characterization, Dissolution and Solubility of Pyromorphite Pb_5(PO_4)_3Cl at 25°C

摘要

Pyromorphite was synthesized by precipitation and characterized by various techniques. The batch dissolution experiment was conducted at 25°C and different initial pHs (2, 4 and 6). The solid phase showed no obvious change before and after dissolution. The aqueous phosphate concentration decreased quickly from 0.22 to 0.01 mmol/L and then increased very slowly with time. After 2160 h dissolution, it reached a steady-state value of about 0.13 mmol/L. The aqueous lead concentration increased initially and reached a peak value after 72 h dissolution.