Composition,structure characteristics and thermal conversion performance of water treatment sludge from coal chemical industry
With the sludge from chemical softening section of Sewage Treatment Plant,Xinjiang Yihua Chemical Industry Co.,Ltd.as the research object,the morphology(SEM),ash composition(XRF),crystal structure(XRD)and functional group characteristics(FTIR)of the sample were analyzed,and the thermal conversion performance of the sample in inert and oxidizing atmospheres was tested based on thermogravimetry(TG-DTG).The results showed that the sludge was in sheet structure,mainly composed of ash(66.19%),with high water content(14.34%)and certain volatile content(17.38%).The main oxides in the sludge were P2O5,CaO,Fe2O3,MgO,etc.The main crystalline components were phosphate,with small amount of C2H5N3O2.Thermal chemical conversion performance test of sludge showed that the weight loss of its pyrolysis under inert atmosphere was 35.48%,which were mainly attributed to the decomposition of organic or inorganic matter in sludge.Weight loss rate of sludge combustion under oxidizing atmosphere was 34.75%,which was mainly caused by the oxidation of organic matter in sludge.Combustion kinetics fitting based on Coast-Redfern model found that the sludge sample had better fitting effect at the fourth stage of combustion reaction,in which the preferred reaction order was 3,and the activation energy was 301.94 kJ/mol,showing that the phosphate decomposition and fixed carbon combustion in sludge required higher energy.
coal chemical industrywater treatmentsludgecompositionstructure characteristicskinetic analysis
万方数据
维普
