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Encyclopedia > Ferrous sulphate

Iron(II) sulfate (FeSO4) is an example of an ionic compound. It is found in various states of hydration (FeSO4H2O, FeSO44H2O, FeSO45H2O, FeSO47H2O); the heptahydrate is also called green vitriol, copperas, or melanterite (a mineral that commonly occurs with pyrite). Iron(II) sulfate has a blue-green color, monoclinic crystal structure, and is water-soluble. Its molecular weight is 151.9026 g/mol. Its melting point is 64C, and at 90C it loses water of hydration to form the monohydrate, a white powder known as the mineral szomolnokite when it occurs naturally. Iron sulfate pentahydrate forms the mineral siderotil.


Iron(II) sulfate is prepared commercially by oxidation of pyrite or by treating iron with sulfuric acid. It is used in the manufacture of inks, in wool dyeing as a mordant, and in water purification as a substitute for aluminium sulfate. It can also be used to treat iron deficiency.


  Results from FactBites:
 
Leaching of mineral ores - Patent 6159435 (5924 words)
In each case the object is to re-oxidise the ferrous sulphate back to the ferric sulphate state in accordance with reaction (e) in order to reutilise the ferric ion for the copper leaching duty (reactions (a) and (b)) without the need for excessive supply of ferric sulphate into the leach slurry.
Because the ferrous sulphate is continuously re-oxidised to the ferric state, which is simultaneously or sequentially employed in the copper leaching process, there is no need for the addition of excessive quantities of ferrous or ferric sulphate into the leach slurry or solution.
During the leaching process, ferrous sulphate was oxidised to ferric state which in turn reacted with chalcocite and covellite to form copper sulphate and elemental sulphur.
Recovering magnetite and ammonium sulphate from ammonium jarosite - Patent 4150095 (2814 words)
The ammonium sulphate solution is separated from the hematite or magnetite, and a portion of the separated ammonium sulphate solution is recycled to the ammonium jarosite precipitation step, the remaining portion of the separated ammonium sulphate solution being recovered.
The feed solution containing dissolved ferrous sulphate can be treated with ammonium sulphate and oxygen in such a manner as to precipitate ammonium jarosite, with the precipitated ammonium jarosite then being separated from the treated solution to produce an ammonium jarosite slurry and a separated solution containing sulphate ions.
The ammonium sulphate solution can then be separated from the insoluble iron oxide, and at least a portion of the separated ammonium sulphate solution recycled to the ammonium jarosite precipitation step, with the remaining portion of the separated ammonium sulphate solution being recovered.
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