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The final destination of the wastes generated in the manufacture of pulp paper is one of the growing concerns in this sector, since the European regulations are becoming stricter in regard to their landfill. So it is urgent to seek ways for their valorization through incorporation in other product as, although not usually dangerous, they are generated in substantial quantities.In this work the following residues were used: (i) calcareous sludge generated in the chemical recovery circuit of the production process; (ii) biological sludge generated in the secondary wastewater treatment step and (iii) fly ash from the combustion of biomass in cogeneration operation. The first stage of work was the waste characterization. Then different blends were prepared and submitted to distinct firing cycles to obtain Portland clinker, the main component of the ordinary cement. Using only wastes in adjusted proportions and under tuned firing cycle, it was possible to obtain ecological Portland clinker. Moreover, it was possible to reduce, by about 50 °C, the clinkering temperature in relation to the value used in cement industry, which results in economical and procedural benefits.

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