What is fes


Ferrous Sulphide(FeS) is a dark grey, solid, compound that’s insoluble in water, but which very readily decomposes in an acidic environment with the release of toxic and explosive Hydrogen Sulphide Gas. It is almost completely soluble in hot acids, resulting in the liberation of Hydrogen Sulphide. Ferrous Sulphide does not readily get decomposed in presence of moist air.

When increased sulphur levels are required, Ferrous Sulphide provides clean, accurate and controlled additions without environmental problems.
Handling storing fes

Ferrous Sulphide is not dangerous to handle, but it is recommended that gloves are worn as routine practice when in direct contact with the product.

Ferrous Sulphide should not be stored near, or inadvertently come into contact with water, steam, acids or oxidizing agents otherwise the toxic, noxious and flammable gas Hydrogen Sulphide is evolved.

Eye or skin contamination should be irrigated with copious amount of water. If the material is ingested, obtain medical attention immediately.It is recommended that first aid procedures should be established through the local office of the Health and Safety Executive.

The information given is intended as a general guide. It is not to be taken as covering all cases, or all aspects of safety procedures. Each customer should establish his own rules and take proper steps appropriate to circumstances within his control.

Particularly he should ensure that the product is suitable for the specific purpose for which it is intended to be used.

VJCHEM Ferrous Sulphide
Chemical Formula FeS
Molecular Weight 88

Physical forms available
• Lumps - Irregular pieces of approximately 3-150 MM
• Crushed - To individual customer specifications.

Shipping Classification
Non-hazardous
CCCN 2835
TTCN 28352000

Main Specifications
Ferrous Sulphide( FeS ) 82.5%Min
Total Sulphur ( S ) 30% Min
Phosphorous ( P ) 0.1% Max
Carbon ( C ) 0.1% Max
Copper ( Cu ) 0.5% Max
Silica ( Si ) 0.5% Max

Packing
Hdpe Jumbo Bag Of 1000 kg. nett. Provided with Loops For Easy Handling.
Quantity Per 20' Container, 20 Mt

Determining sulphide content of ferrous sulphide
Principle
The addition of sulphuric acid to Ferrous Sulphide liberates hydrogen sulphide which is reacted with a known excess of iodine solution. The remaining iodine is then titrated with sodium thiosulphate solution. From the quantity of iodine consumed the % of Ferrous Sulphide can be calculated.

Laboratory preparation of hydrogen

By using the famous Kipp's apparatus, Ferrous Sulphide is reacted with hydrochloric acid to produce hydrogen sulphide

FeS + 2HCl = FeCl2 + H2S

Because Ferrous Sulphide contains free iron, hydrogen is also released during the reaction, Ferrous Sulphide in stick form is mostly used in laboratory preparations.

The control of hydrogen embrittlement in alloy and stainless steel

Many of these steels now carry a minimum sulphur specification as they have been found liable to "fish eye" embrittlement unless hydrogen levels are held below 2 ppm. It is generally more convenient and economic to re-sulphurize using Ferrous Sulphide, thereby ensuring that levels do not drop below 0.015% sulphur.

The production of grey iron

With the advent of electric melting, residual sulphur levels have been decreasing due to cleaner melting practices and the use of low sulphur steel scrap. Below 0.04% sulphur, it has been found that irons do not readily respond to inocculants, and it is necessary to re-sulphurize by using Ferrous Sulphide to hold the level in the 0.05% to 0.12% range.

Production of free cutting steels

The production of free cutting steels The major use of Ferrous Sulphide in lump form is as a re-sulphurizing agent in the production of carbon, alloy and stainless types of free cutting steels. The normal sulphur content in these steels is 0.18% to 0.20% and the additions of Ferrous Sulphide has the effect of improving the machining properties of steels used for
continuous manufacture of such products as nuts and bolts and other mass production steel components.

These steels are produced in electric furnaces, where the metal is tapped into pre-heated ladles prior to casting into ingots. Ferrous Sulphide is added to the ladle where it is fully consumed by adequate temperature and turbulence.

An addition of elemental sulphur would give a lower, and more variable yield, by tending to float on the molten metal surface and by partially escaping as undesirable fumes into the atmosphere.

To produce metal containing sulphur as manganese sulphide globules, Ferrous Sulphide is balanced with a proportionate addition of Ferro Manganese. It is these globules that provide the easy machining characteristic by reducing friction between the metal and the cutting tool, thereby eliminating a build up of turnings. In this application the use
of Ferrous Sulphide reduced environmental pollution and personal discomfort to the operatives.

Production of malleable iron in electric furnaces

White heart malleable iron is a form of cast iron which has the desirable properties of easy machinability, toughness, ductility, corrosion resistance and strength. Ferrous Sulphide in lump form is used to increase the sulphur content of electrically melted iron. This is achieved by charging the furnace with steel scrap of a known sulphur content, to which Ferrosilicon, Ferro Manganese and Sulphur in the form of Ferrous Sulphide are added.
The Ferrous Sulphide is added to influence white iron formation and to obtain a final sulphur content of approximately 0.15% in the casting.

Following the casting stage, annealing involves heating the cast iron to the critical range for several hours in order to create the formation of graphite in the nodular or spheroidal form. The metal is then slowly cooled to complete the annealing process. It is not practical to use elemental sulphur instead of Ferrous Sulphide in the process, due to the release of toxic fumes which create an environmental hazard.

The purification of crude phosphoric acid

The purification of crude phosphoric acid Ferrous Sulphide in cake form is used as a reducing agent in the wet process to remove heavy metal impurities from phosphoric acid.