TY - CHAP A1 - Ay, Peter A1 - Glaser, Claudia A1 - Logsch, Florian A1 - Narra, Satyanarayana A1 - Gemende, Bernhard A1 - Gerbeth, Anja A1 - Riedel, Tobias A1 - Pausch, Nicole A1 - Leiker, Matthias A1 - Bäde, Bianka A1 - Heiduschke, Rene T1 - Micro-structured Iron (III) hydroxide agglomerates with high porosity as adsorbents T2 - Proceedings of the XXVIII International Mineral Processing Congress (IMPC 2016), September 11-15, 2016, Québec City, Canadian Institute of Mining, Metallurgy and Petroleum N2 - This study focusses on the production of micro-structured agglomerates with high porosity from iron (III)-hydroxide-containing materials as adsorbent. A fractal structure of the agglomerates was created through a two-stage agglomeration process. Developing porous structures was necessary to increase the adsorption capacity. Various materials were used for the agglomeration experiments: i) filter cake (dry matter content 23 to 27 wt.-%); ii) FerroSorp®DGμ, a product which is already being used commercially for various applications in water cleaning. These materials in the pristine state have different characteristics such as dry matter content and particle size distribution. The desired optimised agglomerates can be achieved with the help of additives or binders, respectively. Additionally, the agglomeration process parameters play a vital role. In order to produce agglomerates with high porosity, the process was carried out in two steps. Firstly, FerroSorp®DGμ (d90 < 30 µm) was agglomerated jointly with the aforementioned filter cake in an Eirich intensive mixer (particle size range 125 µm < d90 < 500 µm). The second agglomeration step post drying was carried out in a pelletisation disc or in an Eirich intensive mixer with the addition of polymeric binders (up to particle sizes ranging from 2 to 4 mm). Agglomerates were characterised both in short and long term loading tests using phosphate as model ion. Contact times were less than 10 min, similar to practical application in percolation columns, or more than 7 days, respectively. The results show that the agglomerates produced in the two-stage pelletisation process have more advantageous properties like better accessibility of the active sites obtained by specificly influencing the particle size distribution during the two-stage pelletisation process. KW - Microstructured agglomerate KW - Iron(III)-hydoxide-containing material KW - adsorption capacity Y1 - 2016 SN - 978-1-926872-29-2 ER -