Utilization of siliceous filter residues in mineral building materials

1 Scheme for evaluating sustainability

2 Solid, moist filter cake

3 Particle size distributions of the different FRs, ground in an impact grinding and screening plant

4 ESEM image of the FR1 filter residue

5 Chemical compositions of the filter residues

$6 X-ray diffraction diagram for FR1, FR2 and microsilica (MS)$

6 X-ray diffraction diagram for FR1, FR2 and microsilica (MS)

7 Procedural plan for an ecobalance on concrete made with FR composite cement

CO₂ abatement by means of alternative raw materials

Against the background of sustainable resource management the “NanoKiesel” joint research project has shown ways of utilizing siliceous filter residues from the chemical industry in various mineral building materials.

1 Introduction

Germany is one of the leading producers of micron-ized and colloidal silica. Another important branch is the production of silicone oils, silicone resins and elastomers based on silanes and chlorosilanes as intermediate synthesis products. 8000-10 000 tonnes of siliceous filter residues (FR) are generated by each producer every year during the neutralization of the resulting waste water. These residues are currently disposed of expensively in landfills or backfilled in quarries. The costs depend on the quantities produced, the material composition and the regional factors of the...

TEXT Tristan Herbst¹, scientific staff, Dr. Katrin Rübner¹, project leader, Marko Seidemann², scientific staff

¹ BAM Federal Institute for Materials Research and Testing, Berlin/Germany

² Bauhaus-Universität Weimar, F. A. Finger Institute for Building Material Engineering, Weimar/Germany

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