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The solubility of a substance refers to the amount of that substance that can be dissolved in a specific solvent at a particular temperature. The solubility of calcium sulfide decreases when the temperature rises. The solubility of calcium sulfide also increases when the pH of the solution increases.

The chemical compound calcium sulfide is an inorganic yellowish to light gray solid with the formula CaS. It is slightly soluble in water, but insoluble in alcohol. It reacts with acids, producing hydrogen sulfide gas. It occurs in nature as the mineral oldhamite and has several applications. It is used in luminous paints and varnishes; as an additive for lubricants; and as a flotation agent in ore extraction. Calcium sulfide is toxic and can cause skin, eye, or respiratory tract irritation. It is hygroscopic and has a bitter taste.

Dissolution of calcium sulfide is a crucial step in recycling the byproduct gypsum from flue gas desulfurization, and it is important to know the solubility of this salt. Many studies have investigated the dissolution of this salt in a variety of conditions, but few of them were thorough enough to determine saturation values.

In this study, we measured the solubility of CaS in a melt of calcium chloride (CaCl2) at 1173 K. We converted the sample to acid soluble form using potassium carbonate (K2CO3) and tetrapotassium EDTA as conversion and chelating agents, respectively. Then, we conducted extensive kinetic and equilibrium dissolution experiments to obtain the solubility of CaS in this system under numerous parameters.

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