Abstract: Based on the exploration of the best resource disposal approach for ceramsite preparation from electrolytic manganese slag, the influence factor level of sintering temperature on ceramsite preparation process was concerned. It is of great significance to explore the influence of sintering temperature on ceramsite preparation process. In this work, electrolytic manganese residue(EMR), coal fly ash(CFA) and perlite(P) were used as raw materials to prepare ceramsite at different co-sintering temperatures to explore the influence of co-sintering temperature on the physical properties of ceramsite. XRD, SEM-EDS and TG-DTG-DSC were used to characterize the phase composition, microstructure, element distribution and phase transition of ceramics, and the mechanism of co-sintering temperature on the properties of ceramics was analyzed. The results show that the increase of co-sintering temperature can enhance the pressure strength of cylinder, and reduce the 1 h water absorption, softening coefficient and spherical coefficient. The optimal co-sintering temperature is 1 160 ℃. In EMR, gypsum dissolves and exhauts gas during co-sintering, resulting in the generation of CaO. The crystalline transformation of wollastonite and gehlenite produces anorthite, which increases the strength of ceramsite, and the content of anorthite is proportional to the co-sintering temperature and the pressure strength of cylinder. In the co-sintering process, the liquid phase of ‘overfiring' coats the crystal, which can further improve the strength of ceramsite, but due to the ceramsite sphere deformation, its comprehensive performance is reduced. The solidification of Mn is realized by the formation of bustamite calcian in co-sintered ceramsite. The solidification rate of ceramsite leaching toxicity test is 99.92%, and there is no radioactivity. Therefore, the preparation of ceramsite by EMR is safe and reliable.
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2022, Vol. 36 
