Assessment of Utilizing Gypsum and Clays in Manufacturing Thermal Insulators

Volume 10 , Issue 1 , November 2007 , Pages 73-89

Authors

Mazin Y. Tamar-Agha1 1 ; Suzan N. D. Mohamed 2

1 College of Science, University of Baghdad

2 The State Company of the Geological Survey and Mining, Baghdad /Iraq

DOI logo 10.17656/jzs.10165

Keywords

Abstract

Utilization of gypsum, clay and marl from the Fatha Formation (Middle Miocene) in Darbandi Bazian - Sulaimani Government were assessed for manufacturing thermal insulators. The raw materials were analyzed mineralogically, chemically and physically. They were then crushed and ground to less than 125 pm. Ten batches were prepared by mixing 70/30, 60/40,50/50, 40/60 and 30/70 weight % ratio of gypsum to clay or marl, 210 test samples were formed by semi-dry pressing, oven dried at 105C and

fired at 1000, 1050 and 11100 oC with a rise of 100 oC/h and one hour soaking time. The fired briquettes

were tested later on to assess their suitability as thermal insulator. The results of physico-mechanical tests

showed that the linear shrinkage is 0.13 to 3.75 o/o, apparent porosity is 30.8 to 41.4 %, water absorption

17.4 to 28.0 %, bulk density is 1.48 to 1.78 g/cm3, compressive strength is 100.1 to 438.5 kg/cm2 and

modulus of rupture is 31.5 to 76,5 kg/cm2. Meanwhile, four samples were selected to investigate their

thermal conductivity (k) and found that it ranges between 0.3 and 0.4 w/m. oC, which reveals that they are

good insulators.

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