Contact and adsorbent granules
View Patent ↗The present invention relates to a filtering unit at least partially filled with particles agglomerated from fine-particle iron oxide and/or iron oxyhydroxide by producing an aqueous suspension of fine-particle iron oxides and/or iron oxyhydroxides having a BET surface area of 50 to 500 m 2 /g, and removing the water and dissolved constituents by a set of washing drying and filtering steps and processes of using the particles.
1. Granules comprising agglomerates of fine-particle iron oxyhydroxide in the α-FeOOH phase having a BET surface area of 50 to 500 m 2 /g and mechanical and hydraulic abrasion resistance of <12%.
2. The granules according to claim 1 , wherein the BET surface area is 80 to 200 m 2 /g.
3. The granules according to claim 1 , wherein the granules have a residual moisture of <50%.
4. The granules according to claim 1 , wherein the granules have an arsenic (V) adsorption of >37%.
5. The granules according to claim 1 , wherein the granules have an arsenic (III) adsorption of >40.7%.
6. The granules according to claim 1 , wherein the granules have a size of from 0.2 to 2 mm.