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CALCIUM SULFIDE Basic information
CALCIUM SULFIDE Chemical Properties
Safety Information
  • Hazard Codes Xi,N
  • Risk Statements 31-36/37/38-50
  • Safety Statements 28-61
  • RIDADR UN 3179 4.1/PG 2
  • WGK Germany 2
  • TSCA Yes
  • HazardClass 4.3
  • PackingGroup III
CALCIUM SULFIDE Usage And Synthesis
  • Physical propertiesCalcium sulfide is slightly soluble in water but insoluble in alcohol. It reacts with acids, producing hydrogen sulfide gas. Calcium sulfide is pale yellow to light gray with a bitter taste. It is hygroscopic, producing an odor of H2S in moist air.
  • OccurrenceCalcium sulfide occurs in nature as the mineral oldhamite. It has several applications. The ‘luminous’ calcium sulfide is used in phosphors, luminous paints and varnishes. Calcium sulfide also is used as an additive to lubri cants; and as a flotation agent in ore extraction.
  • UsesCALCIUM SULFIDE is  used in electron emitters. Luminous CaS used for making luminous paints or varnishes.
  • UsesCalcium sulfide is used in phosphors, lubricant additives and luminous paints. It reacts with elemental sulfur to give a lime-sulfur. Further, it is used in ore dressing and flotation agent. In addition to this, it is used as a depilatory in the tanning industry and in cosmetics.
  • PreparationCalcium sulfide can be prepared by the direct reaction of the elements, calcined in an inert atmosphere, at a 1:1.05 molecular ratio:
    This white material crystallizes in a cubic structurelike rock salt and the bonding is highly ionic. This is consistent with its description as an ionic solid. CaS can also be produced by the “carbothermic reduction” of calcium sulfate, which entails the conversion of carbon, usually as charcoal, to CO2:
    CaSO4+ 2C→CaS+ 2CO2
    This can react further:
    3CaSO4+ CaS→4CaO+ 4SO2
    Thus, this type of preparation cannot be used to prepare a pure CaS salt.
    Calcium sulfide is available commercially as the pure sulfide as well as the polysulfide due to its extensive usage in the past as an insecticide both agriculturally and in home gardens.
CALCIUM SULFIDE Preparation Products And Raw materials
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