ISSN 1121-7588
V. Ducman*, B. Mirtic**
*ZAG Ljubljana, Ljubljana, Slovenia
**NTF, Ljubljana, Slovenia


The possible use of silica sludge for the production of lightweight aggregates is reported. The results show that the investigated silica sludge can serve as a raw material for the production of lightweight aggregates. The following parameters have been found to significantly influence the process: (i) the mineral composition of the basic materials, (ii) foaming agents, and (iii) the temperature range of firing/foaming. The silica sludge contains about 70 wt.% of quartz, about 5-7 wt.% of feldspar, and the rest is clay. The grain size of silica sludge is below 100 mm, and 58 wt.% is below 20 mm. In order to improve the properties of the obtained aggregate some additional waste materials (paper mud, waste glass) were added to the silica sludge. Depending on the pore forming/foaming agents and firing regime lightweight aggregate with densities between 0.6 and 1.8 g/cm3 were obtained and tested for their suitability as a construction aggregate.
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