Utilization of Chromite Waste as Colorant in Single Fired Wall Tile Glaze Compositions

Öz

The present study focuses on the utilization of chromite waste after neutralization process as coloring agent for transparent and opaque wall tile glaze compositions. The neutralized processed chromite ore waste obtained from the Soda-Chrome Industries Inc. in Kazanlı (Mersin), a branch of Şişe-Cam Chemicals Group, was used in increasing amounts in ceramic wall tile glazes. 3-6% of chromite waste was used in opaque and transparent wall tile glaze recipes. The glaze compositions were applied as thin layers (0.5 mm) on engobed wall tile bodies and fired at 1200°C. After firing, no surface defects were observed on glazed surface. Glazes were charaterized by electron microscopy (SEM-EDX). The color obtained after glazing and firing was defined as CIE-L*a*b* parameters by using UV-Visible Spectrophotometer. Glazed samples were subjected to thermal shock test at 200°C and no evidence of crack and peeling were found between body and glaze coating. It has been observed that waste material has positive effects as a colorant in ceramic glazes at 1200°C.

Anahtar Kelimeler

• Chromite Waste,Waste utilization,Glaze,Colorant

Kromit Atığının Tek Pişirim Duvar Karosu Sırlarında Renklendirici Olarak Kullanılması

Öz

Bu çalışmada nötralizasyon işlemi sonrası elde edilen kromit atığının şeffaf ve opak duvar karosu sır kompozisyonlarında renklendirici olarak kullanılabilirliğine dikkat çekilmiştir. Nötralize edilmiş kromit cevheri atığı Kazanlı (Mersin)’da bulunan ve Şişecam Kimyasalları Grubuna bağlı Soda-Krom Fabrikaları’ndan elde edilmiş ve artan oranlarda şeffaf ve opak duvar karosu sır reçetelerinde %3-6 oranında kullanılmıştır. Sır kompozisyonları astarlı duvar karoları üzerine 0,5 mm kalınlığında uygulanmış ve 1200°C’de fırınlanmıştır. Pişirim sonrasında sırlı yüzeylerde herhangi bir hataya rastlanmamıştır. Sırların karakterizasyonu, Taramalı Elektron Mikroskobu (SEM-EDX) ile yapılmıştır. Sırlama ve pişirme işlemlerinden sonra sırlı yüzeylerde UV-Visible Spectrophotometer ile CIE-L*a*b* parametreleriyle ifade edilen renk değerleri elde edilmiştir. Sırlı örnekler 200°C’de ısıl şok testine tabi tutulmuş bünye-sır arasında, herhangi bir çatlama veya kavlama görülmemiştir. 1200°C’de atık malzemenin seramik sırlarını renklendirmede olumlu etkilere sahip olduğu gözlenmiştir

Anahtar Kelimeler

• Kromit atığı,Atık değerlendirme,Sır,Renklendirici

Kaynakça

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