Calcium Sulphide
Description
Calcium sulphide (CaS) is a white to pale yellow cubic crystalline solid, chemically similar to rock salt in structure, with highly ionic bonding between Ca²⁺ and S²⁻ ions.
Properties
It has a high melting point (~2400°C), density of 2.5–2.6 g/cm³, and is sparingly soluble in water (~0.02 g/100 mL), hydrolyzing slowly to release H₂S gas and form Ca(OH)₂ or Ca(SH)₂ in moist air.
Production
CaS forms by carbothermic reduction of calcium sulfate (CaSO₄ + 2C → CaS + 2CO₂) or direct combination of calcium and sulfur at high temperature; it occurs naturally as the mineral oldhamite in meteorites.
Main uses
Known for red phosphorescence (glows after light exposure), it is used in luminous paints, phosphors, and varnishes; also as a flotation agent in ore processing, lubricant additive, and heavy metal precipitant in wastewater treatment.
Specifications
| Model No. | N-CH1526 |
|---|
