Iron oxides and iron hydroxides have been used in several industrial applications, e.g. pigmentation or catalysis, since decades. The use of such material in adsorption processes for gas and water cleaning is also widely established. Commercial products available on the market are either synthetic iron hydroxides produced using iron salts or iron scrap as raw material or based on iron containing by-products obtained in drinking water treatment. Advantages of such products are defined chemical and physical properties as well as high loading capacities. However, the availability of the raw materials is limited which leads to higher costs.
As a consequence of the termination of open-cast brown coal mining in Lusatia (eastern part of Germany) the accumulation of iron hydroxide and other iron containing compounds in surface water bodies like the river Spree has become a serious environmental problem. Every year several millions of m3 iron hydroxide containing sludge arise as by-product in the industrial mining water treatment plants.
The application of these residues as raw material for the production of adsorbents with a hierarchical pore system and a high porosity was investigated here. Several agglomeration processes as well as the application of various additives or binders were compared with the objective to obtain microstructured agglomerates with a high mechanical strength, a defined particle size distribution and a large external and internal surface area resulting in an optimum loading capacity.
Session: L10 - Short Oral + Poster Presentations
Day: 12 October 2016
Time: 14:45 - 16:45 h