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Vol.10, No.4, 266 ~ 273, 1972
Title
The Kinetics of the Dissolution of Synthetic Lead Sulphate and Roasted Cosalite in Aqeous Chloride Solution
이응조 Eung Cho Lee
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.
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