【摘 要】
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Solid-liquid equilibrium of quaternary system Cd, SO-HO at 298 K was studied by means of an isothermal solution saturation method. Experimental results indicate
【机 构】
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Department of Geochemistry
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Solid-liquid equilibrium of quaternary system Cd, SO-HO at 298 K was studied by means of an isothermal solution saturation method. Experimental results indicate that there are three univariaut curves BE, AE and CE, one invariant point E and three crystallization fields in the quaternary system. The quaternary system belongs to a simple type, and there are no double salts or solid solution existing. The crystallization zones of equilibrium solid phases are CdCl2·5/2H2O(AFB field),3CdSO4·8H2O(AFC field)and Cd(NO3)2·4H2(BEC field),respectively. The composition of the invariant point is CdCl, Cd(NO), CdSO and HO and the contents of which are 17.02%, 45.50%, 4.52% and 32.96%, respectively. The physico-chemicai properties of solution in the quaternary system show regular changes along with the increased cadmium concentration. The results indicate that Cd(NO) possessed the highest solubility among those three salts, which means a strong transfer of Cd ion and a high pollution risk of soil environment. And the solubility of CdSO would be restrained as the salts existing together.
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