Research On Using Firing Additives And Calcium Industrial Waste To Reduce Ceramic Sintering Temperature

More and more attention is paid to the problems of reducing energy consumption andcost in ceramic industry now. This paper summarized methods and research progresses ofreducing the sintering temperature. At the same time, we made use of firing additives andcalcium industrial waste as the object of research, discussed and applied a new type ofadditives and substituted the calcium industrial waste for the raw materials-wollastonite.The two improved technology can achieve good effects.The thesis studied the synthesis and application of mullite structure of sintering additives,and used calcium industrial waste as raw material preparation in ceramic products to reduceceramic sintering temperature. This paper used the X-ray diffraction analysis, X-rayfluorescence elemental analysis, DSC-TG and SEM et al test the properties such ascompositions of raw materials, thermal properties and ceramic micro-structure. The results ofthe study show that:(1) When the silllicon and aluminum molecular ratio of industrial polymeric aluminiumchloride (PAC) and activated silicic acid was0.56, under the temperature of70℃water bath,we could synthesize performance additives. The additives which could be formed with plentyof mullite after the firing in900℃, had obvious advantages of low temperature, also theprocess of simplicity of preparation methods, low price of industrial PAC could be used to theprospect of industrial promotion.(2) we introduced the firing additive synthesis into the porcelain body, we found theamount of mullite increased, quartz phase reduction, the micro-structure of ceramicimproved, even ceramic flexural strength were increased. We fired the high temperatureceramic products with4%additives in1350℃，the ceramic flexural strength was121.2MPa,while reducing firing time of3hours and sintering the ceramic in1280℃, the flexuralstrength was119.2MPa, which was higher than the blank of111.3MPa. At the same time, weadded the additives into the intermediate temperature ceramics; it could not only improve themicro-structure characteristics, reduced the sintering temperature, but also showed that theadditive had good adaptablitily.(3) The researches on the application of desulfurization gypsum in ceramic products and Yangzihu kaolinte showed that if used the appropriate amount, the ceramic formed acomposite structure of anorthite and mullite, also accelerated the fusion of the residual quartz,helped to improve product density. The composite structure could not only ensure productsmicrostructure characteristics, but help to reduce the sintering temperature. But we found thatif we increased the dosage of calcium industrial waste and raied the sintering temperature, thedozens of generation of glass phase, might cause the distortion and couldn’t improve themicrostructure.The preparation and application of low temperature firing additive and selection calciumindustrial waste as a low-temperature and fast-firing raw material could develop the newtechnology of reduce the sintering temperature, also it could reduce the energy consumptionand the environmental pressure caused by ceramic industry, even it had the goodpracticability and generalization.