LIME BASED ON TPP WATER TREATMENT SLUDGE
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Abstract
A derivatographic analysis of water treatment sludge was carried out in the temperature range of 25–1000°C. Based on the data obtained, the kinetics of the formation of free CaO during calcination of samples of dry highly dis-persed sludge at temperatures of 800–1000°C and sludge pressed in the form of tablets was studied. To determine the temperature of interaction of CaO with various additives, the corresponding mixtures with AlOOH and SiO2 additives were modified. It was shown that the decomposition of fine particles of sludge (CaCO3) and their interaction with oxides that impart the hydraulic properties of lime (AlOOH and SiO2) can be carried out at a temperature of 1000°C. Samples of beams were made and their strength properties were determined. X-ray diffraction analysis of the samples showed the presence of CaO∙Al2O3, CaO∙2Al2O3 and 2CaO∙SiO2. As a result of the research, weakly hydraulic lime was obtained using chemical waste sludge, which makes it possible to dispose of waste and at the same time improve the environmental situation in the Republic of Belarus.
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References
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