Recovery of Sulfur from Iron Pyrite

Ganguly, N.D.; Banerjee, Anil Chandra

doi:10.1021/i260045a011

Cited by 10 publications

(3 citation statements)

References 2 publications

(2 reference statements)

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“…The process of thermal decomposition of pyrite (reaction 1) was studied by several investigators (Kunda et al, 1968;Mehta and O'Kane, 1968;Watkinson and Germain, 1972;Ganguly and Banerjee, 1973;Monteiro, 1981). Pyrite is readily decomposed above 650°C under nonoxidizing conditions to produce pyrrhotite and elemental sulfur.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Lime, Sulfur, and Iron from Gypsum and Pyrite Wastes

Kutsovskaya

Hepworth

McGaa

1996

Ind. Eng. Chem. Res.

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Currently, gypsum and pyrite, two major wastes generated by the coal combustion industry, have to be land-filled. The feasibility of a new approach of recovery of lime, iron, and sulfur products from these wastes is discussed in the present work. By thermal decomposition of pyrite, 42% of the sulfur is recovered and pyrrhotite is produced. A thermodynamic analysis shows that the recovery of iron and lime from pyrrhotite and gypsum in a single-stage process is not feasible. Instead, the process has to consist of two subsequent stages. The first is the reduction of pyrrhotite with carbon in the presence of lime to produce iron, calcium sulfide, and carbon monoxide, followed by reaction of calcium sulfide with gypsum to produce lime and a concentrated sulfur dioxide stream. The kinetics of the reactions involved in the two-stage process is studied using thermogravimetric analysis. The reaction rates are favorable above 950°C and depend on initial reagent concentrations. The effectiveness of magnetic separation of the Fe/CaS mixture is studied. The amount of sulfur in the magnetic fraction depends on the reaction temperature.

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Section: Introductionmentioning

confidence: 99%

Recovery of Lime, Sulfur, and Iron from Gypsum and Pyrite Wastes

Kutsovskaya

Hepworth

McGaa

1996

Ind. Eng. Chem. Res.

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“…When pyrite powder is heated to ~1000 °C in the absence of air, at most ~50% of the sulfur can be recovered. 87,88 However, when the pyrite powder is heated to the same temperature in the presence of steam, the reaction is almost complete at the end of 15 min with the yields of sulfur reaching ~85%. The rest of the sulfur forms a mixture of H 2 S and SO 2 .…”

Section: Thermal Decomposition Of Sulfidesmentioning

confidence: 99%

Obtaining elemental sulfur for Martian sulfur concrete

Barkatt

Okutsu

2022

Journal of Chemical Research

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A potential candidate material for the construction of Mars habitats is concrete made from the Martian regolith and sulfur extracted from the regolith itself. Sulfur concrete, which has excellent mechanical properties, can be prepared at a low temperature (<150 °) and without water (unlike Portland-cement concrete). The surface of Mars has a much higher concentration of sulfur than those of the Earth, the Moon, or the asteroids. Sulfur on Mars, however, exists not as elemental sulfur—which is needed in concrete production—but as sulfates (usually hydrated) and sulfides. This paper surveys thermochemical and electrochemical methods that might be used to produce elemental sulfur from its compounds contained in the minerals on Mars. Possible methods include chemical or electrochemical oxidation or decomposition of sulfides, which include sulfides that exist naturally on Mars as well as sulfides that are produced via chemical or electrochemical reduction of sulfates. Some of the methods to obtain elemental sulfur—such as chemical or electrochemical oxidation or decomposition of metal sulfides or hydrogen sulfide—have already been demonstrated. The methods of producing elemental sulfur from sulfur-containing minerals on Mars will have the added benefit of generating byproducts (e.g. water, hydrogen, oxygen, and metals) that are useful for explorations of the Red Planet. In the future, chemical processes for the production of elemental sulfur may also have important industrial applications on Earth.

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“…Magnetic separation was applied successfully to separate sponge iron and iron-nickel alloy from calcium sulfide following reductions of a pentlandite concentrate with hydrogen in the presence of lime [26,29,30]. However, no work has been reported on the separation of iron from calcium sulfide produced by pyrrhotite reduction by coal in the presence of calcium oxide.…”

Section: Ms H Cao M Cas H Omentioning

confidence: 99%

An Innovative Integrated Approach to Minimizing Gypsum and Pyrite Wastes by Conversion to Marketable Products

Tao¹

2000

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Recovery of Sulfur from Iron Pyrite

Cited by 10 publications

References 2 publications

Recovery of Lime, Sulfur, and Iron from Gypsum and Pyrite Wastes

Recovery of Lime, Sulfur, and Iron from Gypsum and Pyrite Wastes

Obtaining elemental sulfur for Martian sulfur concrete

An Innovative Integrated Approach to Minimizing Gypsum and Pyrite Wastes by Conversion to Marketable Products

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