Experimental Study On Recycled Of Ceramic Tiles With Electrolytic Manganese Slag

China is one of the major producer of manganese ore and manganese products inthe world, with rich manganese resource. The main method to product manganese waselectrolysis, which discharged a large amount of electrolytic manganese slag(EM).Recently, landfill treatment was the main way of EM disposal without other effectiverecycling utilization, causing serious environmental pollution. EM is feasible as brickraw material due to its mainly chemical composition of SiO2, Al2O3, CaO, etc. In thepresent study, Recycled ceramic tiles were prepared from electrolytic manganese slag(EM) and other industrial residual in half dry pressure molding way, such as wasteceramic grinding (GP) and waste glass (WG). The influence of raw materials, firingsystem and molding conditions on the properties of ceramic tile was investigated. Themain studies are as follows.1. Physical and chemical analysis of raw materials. The main chemicalcomposition of EM, GP and WG all contain SiO2, Al2O3, CaO, which meet therequirements of the preparation of ceramic tile in terms of chemical composition. Theanalysis of XRD indicates that the main mineral composition are CaSO42H2O andSiO2etc. The analysis of TG-DSC shows that CaSO42H2O begin to decompose andrelease SO2at temperature of450℃, which are of important reference significance forthe establishment of the firing system. SEM (scanning electron microscope)microscopic test showed that EM is column granular and mixed interwovenamorphous structure, with mean particle diameter of10μm. Particle and pore size ofGP and WG were larger than that of EM. Three kinds of different specifications andshapes of the particles can mix and press into compact body fully.2. Research on ceramic tiles prepared from EM and GP. The optimal mixproportion and firing system of the preparation of recycling ceramic tile wereinvestigated with compressive strength, water absorption and porosity as the mainanalysis indexes. The effect of firing system on properties of ceramic tile was alsomeasured. Results show that the optimal mix proportion of recycled ceramic tile was10%EM and90%GP. And the optimal firing system was sintering temperature1150℃, holding time90min and molding pressure100kN and the water requirement8%,respectively. Under the optimal mix proportion and firing system condition, thesamples has compression strength25.2MPa, water absorption0.75%, which meet thenational standard GB/4100-2006.3. Research on ceramic tiles prepared from EM, WG and GP. The optimal mixproportion was determined through orthogonal experimental design, with compressivestrength, water absorption and porosity as the main reference index. The optimal mixproportion was14.3%EM,40.0%WG and45.7%GP, and the optimal firing systemwas sintering temperature1100℃, holding time30min, molding pressure100kN andthe water requirement10%, with the water absorption of0.24%, porosity of0.46%,compressive strength of28.8MPa, which meet the national standard GB/4100-2006.4. Effect of firing system on properties of ceramic tile. Factors affectingproperties of ceramic tile in descending order were sintering temperature, holdingtime and molding pressure. The compressive strength of samples increased first andthen decreased with the increasing sintering temperature, holding time and moldingpressure, while water absorption and porosity declined first and then rose.