| Identification | More | [Name]
CALCIUM SULFIDE | [CAS]
20548-54-3 | [Synonyms]
CALCIUM SULFIDE
Calcium sulfide (CaS)
calciumsulfide(cas)
Calcium-sulphide-
Calcium sulfide, #325 mesh, 99.9+% metals basis
Calcium sulfide,-325 mesh, pure, 99.9+%
CALCIUM SULFIDE, 99.99%
Calciumsulfide(99.9+%-Ca)
CALCIUM SULFIDE ,-45 MICRON
Calcium sulfide, 99% (metals basis excluding Mg), Mg <1%
Calcium sulfide, 99.9% (metals basis excluding Sr), Sr typically 500 ppm
Calcium sulfide, 99.95+% (metals basis excluding Sr), Sr typically 500 ppm
Oldhamite | [EINECS(EC#)]
243-873-5 | [Molecular Formula]
CaS | [MDL Number]
MFCD00015990 | [Molecular Weight]
72.14 | [MOL File]
20548-54-3.mol |
| Chemical Properties | Back Directory | [Appearance]
OFF-WHITE POWDER | [Melting point ]
2000 °C | [density ]
2.6
| [refractive index ]
2.12 | [solubility ]
slightly soluble in H2O; insoluble in ethanol | [form ]
Powder | [color ]
White | [Specific Gravity]
2.5 | [Water Solubility ]
Slightly soluble in water. Insoluble in alcohol. | [Crystal Structure]
NaCl type | [Sensitive ]
Moisture Sensitive | [crystal system]
Cube | [Merck ]
14,1707 | [Space group]
Fm3m | [Lattice constant]
| a/nm | b/nm | c/nm | α/o | β/o | γ/o | V/nm3 | | 0.56908 | 0.56908 | 0.56908 | 90 | 90 | 90 | 0.1843 |
| [CAS DataBase Reference]
20548-54-3(CAS DataBase Reference) | [EPA Substance Registry System]
Calcium sulfide (CaS) (20548-54-3) |
| Safety Data | Back Directory | [Hazard Codes ]
Xi,N | [Risk Statements ]
R31:Contact with acids liberates toxic gas.
R36/37/38:Irritating to eyes, respiratory system and skin .
R50:Very Toxic to aquatic organisms. | [Safety Statements ]
S28:After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) .
S61:Avoid release to the environment. Refer to special instructions safety data sheet . | [RIDADR ]
UN 3179 4.1/PG 2
| [WGK Germany ]
2
| [TSCA ]
Yes | [HazardClass ]
4.3 | [PackingGroup ]
III |
| Hazard Information | Back Directory | [Chemical Properties]
CALCIUM SULFIDE is OFF-WHITE POWDER
| [Physical properties]
Calcium 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. | [Occurrence]
Calcium 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. | [Uses]
Calcium sulfide may be used to remove heavy metals from wastewater. | [Uses]
CALCIUM SULFIDE is used in electron emitters. Luminous CaS used for making luminous paints or varnishes.
| [Uses]
Calcium 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. | [Preparation]
Calcium sulfide can be
prepared by the direct reaction of the elements, calcined
in an inert atmosphere, at a 1:1.05 molecular ratio:
Ca＋S＋heat→CaS
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. | [General Description]
Crystal structure of CaS is cubic. Electrical conductivity of calcium sufide in the temperature range of 650oC-1000oC was studied in great detail. It was concluded that CaS could be used as a potential electrolyte in a sulfur concentration cell.2 | [reaction suitability]
reagent type: catalyst
core: calcium |
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