焙烧温度和铝硅比对稀土尾矿陶粒性能的影响

Effect of Calcination Temperature and Al/Si Ratio on Performance of the Rare Earth Tailings Based Ceramsite

为实现稀土矿冶固体废物的高效再利用,本研究以稀土尾矿为主要原料制备陶粒。在用氧化铝作为铝调整剂,用石英粉作为硅调整剂的条件下,研究焙烧温度和铝硅比对陶粒性能的影响,并通过SEM及XRD对陶粒样品的微观结构进行表征。结果表明:焙烧温度和铝硅比都对陶粒结构和性能都有较大影响,升高温度,陶粒的吸水率和气孔率下降,密度和压碎强度升高;而提高铝硅比,陶粒的吸水率和气孔率先降低后升高,而密度和压碎强度先升高后降低,所以可根据不同要求,调节焙烧温度和铝硅比改变陶粒的性能。

To achieve efficient recycling of rare earth mining solid waste, rare earth tailings were used as the main source material for preparing ceramsite. On condition that Al2O3 acted as an aluminum adjusting agent and quartz powder acted as a silicon adjusting agent, the effects of the calcination temperature and Al/Si ratio on the performance of ceramsite were investigated. The microstructure of the ceramsite was characterized by SEM and XRD analysis. Results indicated that tailoring the sintering temperature and the silica alumina ratio can both affect the structure and performance of the ceramsite; As the sintering temperature increases, the water absorption and porosity of the ceramsite are decreased, but the density and compression strength of the ceramsite are increased; as the Al/Si ratio increases, the water absorption and porosity of the ceramsite are ifrstly increased and then decreased, but the density and compression strength of the ceramsite are ifrstly decreased and then increased. Therefore, the performance of the ceramsite can be adjusted by changing the sintering temperature and Al/Si ratio.