Iron hydroxide oxide
CAS 20344-49-4
EC 243-746-4
Formula FeHO2
MW 88.85 g/mol
Salts & Minerals Water TreatmentMining & MetalsPulp & Paper Coagulation & FlocculationpH Regulation & Buffering
Description
Iron hydroxide oxide (CAS 20344-49-4), also known as HFO, ferrihydrite, or C.I. 77492, is an inorganic iron compound with the formula FeHO2. It occurs naturally as a mineral and is produced synthetically for industrial use. No E-code is assigned to this substance.
In water treatment, HFO functions as a coagulant by adsorbing dissolved phosphates, arsenic, and heavy metals onto its surface, enabling their removal through sedimentation or filtration. In mining operations, it supports pH regulation in acid mine drainage by precipitating dissolved iron and neutralising acidic effluents. Pulp and paper producers use it to control process water chemistry.
Iron hydroxide oxide is supplied under REACH compliance and is available in technical grade as a reddish-brown crystalline solid. It is typically packaged in 25 kg bags or bulk quantities depending on application requirements. Buyers should confirm grade specifications and purity documentation with the supplier prior to ordering.
In water treatment, HFO functions as a coagulant by adsorbing dissolved phosphates, arsenic, and heavy metals onto its surface, enabling their removal through sedimentation or filtration. In mining operations, it supports pH regulation in acid mine drainage by precipitating dissolved iron and neutralising acidic effluents. Pulp and paper producers use it to control process water chemistry.
Iron hydroxide oxide is supplied under REACH compliance and is available in technical grade as a reddish-brown crystalline solid. It is typically packaged in 25 kg bags or bulk quantities depending on application requirements. Buyers should confirm grade specifications and purity documentation with the supplier prior to ordering.
Physical Properties
| Melting Point | 135°C |
| Density | 4.27 g/cm³ |
| Appearance | reddish-brown crystalline solid |
| Color | Red-brown |
| Form | crystalline |
| Water Solubility | Soluble in mineral acids. Insoluble in water and ethanol. |
Trade & Regulatory
| Storage Class | 11 - Combustible Solids |
Other Names
Iron(III) hydroxideHFOferrihydritehydrous ferric oxideIron(III) Oxide-Hydroxidec.i. 77492Ferrous acidIRON HYDROXIDEα-Iron hydroxide
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