Chemical formula: Fe2O3
Synonyms: ferric oxide, oxide of iron, red iron oxide, hematite
Amount: 200 g
Appearance and odour: red-brown fine powder without appreciable odour.
Grade: 99 %, high grade
Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labeled. Bottle and cap are UN approved and reusable.
Description and uses: iron’s main oxide. This is NOT a ‘pottery’ grade and as such has only negligible acid-insoluble residue.
A precursor to most other ferric (iron (III)) compounds by dissolving it in an excess of hot, conc. (> 95 %) sulphuric acid or by fusing it with an excess of sodium bisulphate.
Also find use in pyrotechnical applications and it’s one of the main components of Thermite. This mixture of ferric oxide and aluminium powder (often fluxes like fluorite are added to increase metal recovery) once ignited ‘burns’ (Goldschmidt Reaction) to sufficiently high temperatures (above 2,500 Celsius) to produce a mixture of molten alumina and molten iron metal, which separates out.
The Goldschmidt Reaction can also be used to produce valuable alloys and metal master batches (for addition to steel alloys) like ferrosilicon, ferrovanadium, ferrochromium, ferrotitanium, ferroniobium etc, by reacting aluminium powder with the relevant mixture of oxides.
Fused with KOH and KClO3, an unusual ruby red iron (VI) compound is formed: potassium ferrate (VI), a very strong oxidiser:
Fe2O3(s) + 4 KOH(l) + KClO3(s) --- > 2 K2FeO4(s) + KCl(l) + 2 H2O(g)
In neutral or acid conditions ferrate reduces to ferric (Fe (III)) ions.
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