FERROLOX^™: Iron hydroxide based adsorbent media

Product Information: FERROLOX (Old name Filtersorb HSR)

Using a patented process, ferric hydroxide can now be produced in a granular form. Various bead diameters can be made by combination of crushing and sieving procedures. This gives access to a great variety of new applications of Ferric (III) hydroxide.

The Filter media, containing iron hydroxide Fe(OH)₃ has an amorphous structure. The ferric ions content in the filtering media is about 40% by weigh. Because of its chemical activity, Ferric (III) hydroxide is quite appropriate to bind arsenate, phosphate or sulfide ions in aqueous media. Due to internal high pH of media it has an additional effect of the reaction with H₂S and can reach oxidation capacity up to 20% by its dry weight.

Hydrogen sulfide is a colorless gas with an offensive stench and is said to smell like rotten eggs. The gas can be detected at a level of 2 parts per billion. It is very errosive in a wet state and become Sox when it is oxidized.

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Product Information: FERROLOX-G (see Detailed Documentation)

FERROLOX-G is a iron hydroxide based, pelletized gas purification compound. It is particularly effective at removing Hydrogen Sulfide (H₂S) from gas-producing installations (i.e. digesters, landfills). It is optimally shaped and highly porous, thus ensuring maximum loading capacity at low costs.

The pelletized gas purification compound FERROLOX-G is a highly effective absorption compound used in both, moving and fixed-bed vessels.

Advanced Applications

Arsenic Removal

H₂S removal from Gas

Phosphate removal

Copper removal

Regeneration is made with 0.1% NaOH solution at pH 13. After loading the contaminats on the granulated FERROLOX adsorbent, they can be washed out by simply soaking the media with 0.1% sodium hydroxide brine for 1 hour at a high pH value.

The FERROLOX media surface is negatively charged and this leads to repulsion between negatively charged FERROLOX media granules and adsorbed anions. The adsorbed anions are then released in the high pH solution. The pH has to be adjusted between 12.5 - 13.5. These pH values can recover adsorbed contaminants up to 90 - 99%. The soak solution along with the concentrated phosphate can be washed out. FERROLOX can be washed later with diluted acid to the level required for reuse. pH of the wash water should be setup between 5.5 - 6.5.

FERROLOX can be regenrated up to 4 to 5 times.