Development of Lightweight Refractory Insulating Brick Using Recycled Paper Processing Waste As Alternative Raw Material

Öz

Production of porous anorthite heat-insulating ceramics from mixtures of fireclay (chamotte), recycled paper processing waste sludge and pore-making sawdust addition are investigated. Recycled paper processing waste was used as a suitable alternative raw material source to produce porous anorthite refractories due to their organic (cellulose fibers) and inorganic (calcium carbonate, clay minerals) content. Prepared slurry mixtures were shaped, dried and fired. Highly porous anorthite ceramics from the mixtures with up to 30% sawdust addition was successfully produced. The cellulose fibers and inorganic content of the waste provided to form micro-porosity and anorthite composition (CaO·Al2O3·2SiO2) of the fired samples, respectively. Physical properties such as bulk density, apparent porosity, percent linear change were investigated as well as the mechanical strengths and thermal conductivity values of the samples. Thermal conductivities of the samples decreased from 0.25 W/mK (1.12 g/cm3) to 0.13 W/mK (0.64 g/cm3) with decreasing their density. Samples were stable at high temperatures up to 1100°C, and their cold strength was sufficiently high. Produced highly porous anorthite ceramics could be used for insulation in high temperature applications. © Afyon Kocatepe Üniversitesi

Anahtar Kelimeler

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Alternatif Hammadde Olarak Kağıt Sanayi Üretim Atığı Kullanılarak Hafif Refrakter İzolasyon Tuğlası Geliştirilmesi

Öz

Bu çalışmada, geri-dönüşüm kağıt üretim atığının, pişmiş kil (şamot) ve ilave gözenek yapıcı olarak odun talaşı karışımlarında birlikte kullanılmasıyla gözenekli ve hafif anortit esaslı ısı yalıtım refrakter tuğlaların üretilmesi ve özelliklerinin geliştirilmesi incelenmiştir. Geri-dönüşüm kağıt üretim atığı, organik (selüloz fiber) ve inorganik (kalsiyum karbonat, kil) içeriğinden dolayı gözenekli anortit kompozisyonuna (CaO·Al2O3·2SiO2) sahip seramik malzemeleri üretmek için alternatif bir hammadde olarak kullanılmıştır. Hazırlanan karışımlar çamur döküm yöntemiyle şekillendirilmiş, uygun şartlarda kurutularak pişirilmiştir. %30’a kadar talaş ilaveli karışımlardan yüksek gözenek oranına sahip anortit refrakter tuğlalar başarıyla üretilmiştir. Kağıt atığının organik kısmı olan selüloz lif içeriği, pişmiş örneklerde mikro-gözenek oluşumunu, inorganik içeriği (kalsiyum karbonat ve kil mineralleri) ise pişmiş örneklerde anortit kompozisyonunun oluşmasını sağlamıştır. Pişmiş örneklerin ısı iletim katsayıları, mekanik dayanımları, yoğunluk, porozite, boyut değişimleri incelenmiştir. Örneklerin ısıl iletkenlikleri yoğunluk azalmasına bağlı olarak 0.25 W/mK (1.12 g/cm)’den 0.13 W/mK (0.64 g/cm3)’e kadar düşmüştür. Örnekler 1100°C’e kadar olan sıcaklıklarda oldukça kararlıdır ve mekanik dayanımlarının yeterli olduğu ölçülmüştür. Çalışma sonuçlarına göre, üretilen gözenekli ve hafif anortit refrakter tuğlaların 1100°C’ye kadar olan yüksek sıcaklık uygulamalarında ısı yalıtım amaçlı kullanılabilme potansiyeli olduğu görülmüştür.

Anahtar Kelimeler

• Gözenek, Isıl iletkenlik, Anortit, Refrakter izolasyon tuğlası, Geridönüşüm kağıt atığı.

Kaynakça

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