Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Assessment of egyptian talc-carbonate deposits in production of shaped cordierite-ceramics for thermo-mechanical applications
The aim of this work is to assess Egyptian talc-carbonate deposits for production of shaped refractory cordierite bodies for thermo-mechanical applications. Twelve stoichiometric raw cordierite powder batches were designed and prepared from representative sample of these rocks and/or a highgrade talc rock with 100/0, 0/100 and 50/50 weight ratios as main sources for magnesia and silica. Also, Aswan fireclay and/or Sinai kaolin as well as imported calcined bauxite and alumina were applied as sources for alumina and silica. The effect of composition as well as firing conditions on rate of cordierite formation and densification parameters of shaped batches, co-clinkered up to 1400 deg C, was investigated. Three batches were selected for preparing dense refractory briquettes containing maximum cordierite content after co-clinkering at 1300-1350 deg C. Physical properties of the prepared cordierite briquettes were assessed in relation to their composition and microstructure. The prepared cordierite briquettes could be classified according to their compositions and properties into two refractory grades. Both are adequate to be applied as kiln furniture for ceramic tunnel kilns with different maximum service temperatures. The raw batches, based on 100/0 and 50/50 of the pure talc/talc-carbonate are suitable for manufacturing cordierite bodies with relatively higher refractory grade after firing at 1350 deg C. These can be recommended for safe application as kiln furniture in firing heavy clay products, e. g. ceramic tiles at maximum service temperatures up to 1200 deg C. On the other hand, the batch prepared from 100 % talc-carbonate is only adequate for production of cordierite bodies, with relatively lower grade after firing up to 1250-1300 deg C. These bodies can be safely applied as kiln-furniture for tunnel kilns used in firing clay building bricks up to 1000 deg C.
Assessment of egyptian talc-carbonate deposits in production of shaped cordierite-ceramics for thermo-mechanical applications
The aim of this work is to assess Egyptian talc-carbonate deposits for production of shaped refractory cordierite bodies for thermo-mechanical applications. Twelve stoichiometric raw cordierite powder batches were designed and prepared from representative sample of these rocks and/or a highgrade talc rock with 100/0, 0/100 and 50/50 weight ratios as main sources for magnesia and silica. Also, Aswan fireclay and/or Sinai kaolin as well as imported calcined bauxite and alumina were applied as sources for alumina and silica. The effect of composition as well as firing conditions on rate of cordierite formation and densification parameters of shaped batches, co-clinkered up to 1400 deg C, was investigated. Three batches were selected for preparing dense refractory briquettes containing maximum cordierite content after co-clinkering at 1300-1350 deg C. Physical properties of the prepared cordierite briquettes were assessed in relation to their composition and microstructure. The prepared cordierite briquettes could be classified according to their compositions and properties into two refractory grades. Both are adequate to be applied as kiln furniture for ceramic tunnel kilns with different maximum service temperatures. The raw batches, based on 100/0 and 50/50 of the pure talc/talc-carbonate are suitable for manufacturing cordierite bodies with relatively higher refractory grade after firing at 1350 deg C. These can be recommended for safe application as kiln furniture in firing heavy clay products, e. g. ceramic tiles at maximum service temperatures up to 1200 deg C. On the other hand, the batch prepared from 100 % talc-carbonate is only adequate for production of cordierite bodies, with relatively lower grade after firing up to 1250-1300 deg C. These bodies can be safely applied as kiln-furniture for tunnel kilns used in firing clay building bricks up to 1000 deg C.
Assessment of egyptian talc-carbonate deposits in production of shaped cordierite-ceramics for thermo-mechanical applications
Serry, M.A. (Autor:in) / Ahmed, S.E. (Autor:in) / Ali Bik, M.W. (Autor:in) / Abdel Wahab, W. (Autor:in)
2011
8 Seiten, 3 Bilder, 8 Tabellen, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
Ägypten , Aluminiumoxid , Bauxit , Carbonat , Cordierit , Kaolin , Kieselerde , Lagerstätte , Mikrostruktur , Schamotte , Talk , thermomechanische Eigenschaft , Tunnelofen , Ofenauskleidung
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