Synthesis of alinite cement using soda solid waste

Güneş, Aslı
This study is dedicated to give a production route for a kind of low energy cement called alinite cement using the waste material of soda industry as the main raw material. Soda solid waste, clay and minor amount of iron ore were mixed with certain quantities and burned at six different burning temperatures of 1050, 1100, 1150, 1200, 1350, and 1450 ºC. The resultant clinkers were investigated by mineralogical and chemical analysis. Mineralogical analyses were performed by X-Ray Diffraction (XRD) technique. XRD analyses revealed the formation of alinite phase in the clinkers. Chemical analyses were performed by X-Ray Fluorescence spectroscopy technique and by wet chemical analysis. Especially, free lime content of the clinkers was searched and an optimum burning temperature was determined. In order to find the compressive strength of the alinite cement, larger amounts of alinite clinker were manufactured in wet rod shape raw mix in a laboratory type of furnace at 1200, 1350 and 1450 ºC. The results have shown that forming alinite phase requires ~6wt % chlorine. Alinite clinker is obtained using soda waste at the temperature range between 1050 and 1200 ºC. However, the free CaO becomes much lower as 0.12 at 1200 ºC. Moreover, a lime saturation factor of 76, which is lower than ordinary Portland clinker is obtained. Satisfactory compressive strength was achieved by gypsum addition.


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A production route of alinite cement clinker using the waste material of the Solvay process of the soda industry as the main raw material was searched. Soda sludge (73.5 wt%), clay (26.3 wt%) and minor amounts of iron ore (0.2 wt%) were mixed to obtain a raw mix that is later burned at nine different burning schemes. Four different burning temperatures (1050, 1100, 1150 and 1200 degrees C) and three different burning durations (60, 90 and 180 min) were applied for clinkerisation. The clinkers obtained were ...
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Citation Formats
A. Güneş, “Synthesis of alinite cement using soda solid waste,” M.S. - Master of Science, Middle East Technical University, 2010.