The reduction of CO 2 emission from cement industry represents a priority task in the roadmap defined for the year 2020 by the European Union (EU) Commission for a resource efficient Europe. Several research projects have been undertaken aimed at developing non-hazardous materials as partial substitute of clinker in cement formulations, but also new, low-carbon, cements fully replacing clinker. Among the new cementing materials, Si-Al geopolymers seem the most promising, in terms of CO 2 emission and mechanical and thermal properties. In this chapter, mechanochemical processing of kaolin clays to produce metakaolin (MKA) for the synthesis of Si-Al geopolymers is proposed as an alternative process to replace thermal treatments performed at 650-850 °C. Results obtained show that the mechano-chemical process is also suitable to make low cost blended Si-Al geopolymers where 40% of MKA is replaced by mechano-chemically activated volcanic tuffs. The compatibility of mechano-chemistry with industrial production was investigated by building a prototype milling system that was tested in a small industrial facility producing zeolites from industrial wastes. The degree of automation allowed the prototype to work unattended for 10 months. Based on the results obtained from these tests, a milling system for a full scale production of mechano-chemically activated rock materials was designed, and its performances analysed.
CITATION STYLE
Ciccioli, P., Capitani, D., Gualtieri, S., Soragni, E., Belardi, G., Plescia, P., & Contini, G. (2019). Mechano-chemistry of rock materials for the industrial production of new geopolymeric cements. In Factories of the Future: The Italian Flagship Initiative (pp. 383–407). Springer International Publishing. https://doi.org/10.1007/978-3-319-94358-9_18
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