Solubility of CaS in Molten CaCl₂

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In order to check the solubility of CaS during sulfide reduction in molten CaCl₂, the mixture of CaCl₂ and a small amount of CaS was melted in Ar at the range from 1123 K to 1223 K. The melt was sampled by quartz tube and rapidly solidified. The solidified samples showed a lamella structure with CaS particles, which results in a simple eutectic reaction between CaCl₂ and CaS. Using ICP-AES analysis, the saturation of CaS was found to be completed within 1.8 ks, and 1.77 ± 0.1 mol%CaS at 1173 K was measured as the solubility limit at the initial composition of 3.0 mol%CaS. A tentative phase diagram of CaCl₂–CaS binary system was proposed based on the solubility analysis in these temperatures and eutectic structure.

Fig. 8 Phase diagram of CaCl₂–CaS system estimated by CaS solubility in CaCl₂. Closed and open circles show the initial conditions and the analyzed liquidus position, respectively.