1317-66-4 Usage
Description
Marcasite, a mineral form of iron disulfide, is characterized by its yellow rhombic crystals, with a density of 4.87g/cm3 and a hardness of 6.3 on the Mohs scale. It transforms into a more stable form of pyrite when heated at 480°C. Marcasite is insoluble in dilute acids and water, with a solubility of 4.9 mg/L at 20°C.
Uses
Used in Iron Production:
Marcasite is used as a source of iron for the production of iron and steel. Its iron content makes it a valuable resource in the metallurgical industry.
Used in Sulfur Production:
Marcasite is also utilized as a source of sulfur, which is essential for various industrial applications, including the production of sulfuric acid and as a raw material in the chemical industry.
Used in Chemical Industry:
Although not the primary method for producing sulfuric acid, marcasite can be used in the chemical industry to produce this important compound. However, it is worth noting that sulfuric acid is commercially produced through more economical processes that do not involve marcasite.
Reactions
Both forms of iron disulfide are very stable at ordinary temperatures and also inert towards most chemicals. Heating at elevated temperatures gives iron(III) oxide and sulfur dioxide. This process for producing sulfur dioxide is also applied to manufacture sulfuric acid:
4FeS2 + 11O2 → 2Fe2O3 + 8SO2
When the disulfide is heated at 600°C in a vacuum, it decomposes to iron(II) sulfide and sulfur:
FeS2 → FeS + S
Production Methods
Iron disulfide is obtained from its naturally occurring minerals, pyrite and marcasite. In the laboratory it may be prepared along with iron(II) sulfide by passing dry hydrogen sulfide through a suspension of hydrated iron(III) oxide or iron(III) hydroxide in alkaline medium. The unstable product formed decomposes to FeS2 and FeS.
Check Digit Verification of cas no
The CAS Registry Mumber 1317-66-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,3,1 and 7 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1317-66:
(6*1)+(5*3)+(4*1)+(3*7)+(2*6)+(1*6)=64
64 % 10 = 4
So 1317-66-4 is a valid CAS Registry Number.
InChI:InChI=1S/Fe.S2/c;1-2/q+2;-2
