Sustainable Secondary Resources from Brazilian Kaolin Deposits for the Production of Calcined Clays
An almost complete reuse of industrial residues coming from kaolin industry seems to be possible by producing different new types of carbon dioxide reduced cement types. Mainly the production of new cement types like calciumsulfoaluminate cement (CSA), calciumsulfoaluminate—(Belite)–(Ferrite) CSFA) cements seem to be possible. The landfill of these materials therefore has not to be taken into account. Especially the reuse of industrial residues as secondary cementitious materials is possible. Different clay mineral based industrial residues were investigated as potential pozzolanic materials and for reuse as a base raw material for CSA-production. Under this aspect not only composite cements can be of interest, but also these materials were used to burn different CO2-reduced cement types. The geological surrounding of these huge amounts of clay mineral deposits in the Amazon area are investigated but also the not necessary landfill-technology for these residues is taken into account. Three main topics are under investigation: occurrence of secondary resources, availability and reuse of secondary cementitious materials and application of developed CO2-reduced cement types. In this paper the occurrence and potential use of Brazilian waste kaolinites as secondary cementitious material is described.
KeywordsAmazon Region Composite Cement Cement Type Industrial Residue Brazilian Amazon Region
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