| Title |
The Kinetics of the Dissolution of Synthetic Lead Sulphate and Roasted Cosalite in Aqeous Chloride Solution |
| Abstract |
The kinetics of the dissolution of synthetic lead sulphate and of ropasted cosalite(2Pbs·Bi₂S₃) in solutions of sodium chloride and calcium chloride were investigated. When pressed pellets of synthetic lead sulphate were leached in sodium chloride, the following reaction was observed. PbSO₄+2NaCl=PbCl₂+ Na₂SO₄ Over the temperature range 60℃ to 90℃ the reaction displayed linear kinetics and the leaching rate was a function of stirring rate that were interpreted as indicating rate control by diffusion through the liquid boundary layer. The apparent activation energy for the dissolution process are 9.5±0.5 ㎉ and 12±1 ㎉ at stirring speeds of 950 r.p.m. and 630 r.p.m. respectively. Lead in the roasted cosalite appears to dissolve different from the synthetic material. Dissolution rate of lead in cosalite in a solution of NaCl is faster than that of CaCl₂. |