CALCIUM SULFIDE

Synonym(s):Calcium monosulfide

CAS NO.：20548-54-3
Empirical Formula: CaHS
Molecular Weight: 73.15
MDL number: MFCD00015990
EINECS: 243-873-5
SAFETY DATA SHEET (SDS)
Update Date: 2024-12-18 14:07:02

What is CALCIUM SULFIDE?

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.

The Uses of CALCIUM SULFIDE

CALCIUM SULFIDE is used in electron emitters. Luminous CaS used for making luminous paints or varnishes.

The Uses of CALCIUM SULFIDE

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.

The Uses of CALCIUM SULFIDE

Calcium sulfide may be used to remove heavy metals from wastewater.

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 650^oC-1000^oC was studied in great detail. It was concluded that CaS could be used as a potential electrolyte in a sulfur concentration cell.2

Properties of CALCIUM SULFIDE

Melting point:	2000 °C
Density	2.6
refractive index	2.12
solubility	slightly soluble in H2O; insoluble in ethanol
form	Powder
Specific Gravity	2.5
color	White
Water Solubility	Slightly soluble in water. Insoluble in alcohol.
Sensitive	Moisture Sensitive
Merck	14,1707
CAS DataBase Reference	20548-54-3(CAS DataBase Reference)
EPA Substance Registry System	Calcium sulfide (CaS) (20548-54-3)

Safety information for CALCIUM SULFIDE

Signal word	Danger
Pictogram(s)	Flame Flammables GHS02 Exclamation Mark Irritant GHS07 Environment GHS09
GHS Hazard Statements	H228:Flammable solids H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation H400:Hazardous to the aquatic environment, acute hazard
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273:Avoid release to the environment. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.