formation of iron sulphide in djibouti

Pyrophoric iron sulfide is formed by the action of corrosive sulfur compounds on iron and steel in process facilities particularly in vessels storage tanks and pipeline scraper traps If such equipment has contained asphalt aromatic tars sour crude highsulfur fuel oil aromatic gases and similar products the potential exists for the formation of black or brownishcolored pyrophoric iron

Juergen Schieber 2011 Iron Sulfide Formation Encyclopedia of Geobiology Springer Verlag J Reitner V Thiel Eds p 486502 2 IRON SULFIDE FORMATION There has been a great deal of research into the formation of sedimentary iron sulfide minerals because their history is intertwined with the biogeochemical cycles of iron sulfur

Iron sulfides occur in sediments from a wide range of depositional environments from the deep sea to the nonmarine and the principal mineral in the rock record is pyrite FeS 2 cubic Its dimorph marcasite orthorhombic is considered metastable and apt to invert to pyrite over geologic time Murowchick 1992 but is probably more widespread than commonly acknowledged Schieber 2007

May 01 2018 · 2 Iron sulfide formation and transformation at high temperature The observed transformation sequence for iron sulfides under these conditions was mackinawite 1 day → troilite 4 days → pyrrhotite 7 days → pyrite 12pyrrhotite 21 days The thickness of iron sulfide layer increased with time 3

Jul 21 2017 · While the detailed microbial mechanisms for the formation of iron pyrite are still far from clear a variety of different iron sulfide polymorphs have been reported to occur8−11 In contrast to the biogenic formation of iron pyrite its formation during metal corrosion is much better understood including the conditions under which nonstoichiometric

Feb 10 2017 · An aerosolassisted chemical vapor method leading to iron sulfide scales of varying phases and morphologies by reaction of pipeline steels with sulfur compounds has been developed This chemical vapor reaction methodology is useful for generating model iron sulfide scales pertinent to the interaction of sour crude oil with piplelines used in the oil and gas industry

Initially almost all the surface sites can interact readily with H 2 S to form a layer of iron sulfides Over longer reaction times reaction occurs with deeper sites to form bulk sulfides Regeneration of ferric hydroxide by oxidation with oxygen converts Fe 2 to Fe 3 and S 2 anions are replaced by O 2 with formation of elemental sulfur

Sulfide to Sulfate Reaction Mechanism A Study of the Sulfide to Sulfate Reaction Mechanism as it Relates to the Formation of Acid Mine Waters Ohio State University Research Foundation ColumbusOhio 43210 for the FEDERAL WATER POLLUTION CONTROL ADMINISTRATION DEPARTMENT OF THE INTERIOR Program Number FWPCA Grant No 14010 FPS February 1970

Asal Djibouti Criaud Fouillac 1989 These scales are usually intermixed with amorphous silica or with metal mostly iron The study of iron sulfide scale formation is also of great importance since it is the most abundant component in sulfiderich scales

Pyrophoric iron sulfide is formed by the action of corrosive sulfur compounds on iron and steel in process facilities particularly in vessels storage tanks and pipeline scraper traps If such equipment has contained asphalt aromatic tars sour crude highsulfur fuel oil aromatic gases and similar products the potential exists for the formation of black or brownishcolored pyrophoric iron sulfide scale powder

Juergen Schieber 2011 Iron Sulfide Formation Encyclopedia of Geobiology Springer Verlag J Reitner V Thiel Eds p 486502 2 IRON SULFIDE FORMATION There has been a great deal of research into the formation of sedimentary iron sulfide minerals because their history is intertwined with the biogeochemical cycles of iron sulfur

Feb 10 2017 · An aerosolassisted chemical vapor method leading to iron sulfide scales of varying phases and morphologies by reaction of pipeline steels with sulfur compounds has been developed This chemical vapor reaction methodology is useful for generating model iron sulfide scales pertinent to the interaction of sour crude oil with piplelines used in the oil and gas industry

Jul 21 2017 · While the detailed microbial mechanisms for the formation of iron pyrite are still far from clear a variety of different iron sulfide polymorphs have been reported to occur8−11 In contrast to the biogenic formation of iron pyrite its formation during metal corrosion is much better understood including the conditions under which nonstoichiometric

At high vacuum the ratio was 0575 Sulfur was absent from the black deposits when the cans were sealed without evacuation even when high levels of cystine were added In commercially packed shrimp the sulfur to iron ratio was 0322 which is consistent with a deposit of mixed oxides of iron combined with ferrous sulfide

For example accumulation of iron sulfide in the critical near wellbore area can cause loss of performance of disposal wells 1 water supply wells 2 water injectors 35 and gas wells 67 Iron sulfide forms in the wellbore area as a result of the reaction of hydrogen sulfide and iron Hydrogen sulfide originates downhole from several sources including thermal decomposition of drilling mud additives 8 sulfate

When these sulfur compounds on the vessel wall of iron and iron oxide longterm corrosion will generate iron sulfide Fe2Ss Iron sulfide a dark brown or black mass with metallic luster can spontaneously ignite when exposed to oxygen in the air It is easier to ignite when exposed to air The ignition point of the iron sulfide is about 40

Dec 05 2019 · It is formed by reaction of hydrogen sulfide with carbon steel The iron in the steel reacts with hydrogen sulfide to create an iron crust scale on the metal surface When a refinery processes sour crude oil the hydrogen sulfide present in the crude oil causes this problem to develop When production stops for maintenance work any iron sulfide present can react with the air through an oxidation reaction

MultiChem provides a number of specialty chemicals to remove iron sulfide all specifically designed to attack your unique production challenges in the most effective way possible Our approach is tailored to your own system conditions and operating parameters for the best in corrosion protection

Synthetic Sorbent Materials Based on Metal Sulphides and Oxides focuses on development of inorganic nanomaterials for removal of metallic species from the aqueous environment General synthetic methods to prepare such materials are lacking This book investigates problems of controlled synthesis of these materials and the effect of their morphological characteristics on their sorption capacity

deposits are initiated via formation of FeS particles in suspension by reaction of H2S or organic sulphides with iron oxides from upstream corrosion processes leading to particulate fouling An alternate view is that a film of iron sulphide forms first on the surface the carbonaceous mesophase then wets the iron sulphide surface leading to a

May 06 2016 · Introduction Iron technology first appears in the African continent in the 1st millennium BCE and the term Iron Age is generally used certainly south of the Sahara to describe ironusing communities in Africa until the modern historical thus covers a very long period of time and is used to describe a great variety of different societies from simple villagebased farmers and nomadic

172 The Mechanism of the Reaction of Moist Hydrogen Sulphide with Iron 173 Blistering of Steel in Hydrogen Sulphide Solutions 174 Effect of Composition and Structure of Steel on its Susceptibility to Embrittlement by Hydrogen Sulphide 175 Practical Measures Against Sulphide Corrosion Cracking of Steel in Service 176 Conclusions

of iron and dissolved sulphide result in iron sulphide scale deposits Criaud and Fouillac 1989 High enthalpy and low salinity fluids usually form silica scale eg certain wells in Iceland On the other hand high temperature liquids with high TDS content yield both siliceous and sulphide scale with lead sulphide being one of the major