Utilization of recycled paper processing residues and clay of different sources for the production of porous anorthite ceramics

Autores: Sutcu, M.|Akkurt, S.
Fuente: J. Eur. Ceram. Soc.
30 (8), 1785-1793

Production of porous anorthite ceramics from mixtures of paper processing residues and three different clays are investigated. Suitability of three different clays such as enriched clay, commercial clay and fireclay for manufacturing of anorthite based lightweight refractory bricks was studied. Porous character to the ceramic was provided by addition of paper processing residues (PPR). Samples with 30-40 wt% PPR fired at 1200-1400 degrees C contained anorthite (CaO center dot Al2O3 center dot 2SiO(2)) as major phase and some minor secondary phases such as mullite (3Al(2)O(3)center dot 2SiO(2)) or gehlenite (2CaO center dot Al2O3 center dot SiO2), depending on the calcite to clay ratio. Anorthite formation for all clay types was quite successful in samples with 30-40 wt% of paper residues fired at 1300 degrees C. A higher firing temperature of 1400 degrees C was needed for the fireclay added samples to produce a well sintered product with large pores. Gehlenite phase occurred! mostly at lower temperatures and in samples containing higher amount of calcium (50 wt% PPR). Compressive strength of compacted and fired pellets consisting of mainly anorthite ranged from 8 to 43 MPa

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