微波热处理温度对尾矿微晶玻璃晶化过程及性能的影响

Effects of Microwave Heat Treatment Temperature on Crystallization and Properties of Tailing-based Glass-Ceramics

以金尾矿和铁尾矿为主要原料,采用熔融法制备了CaO-MgO-Al2O3-SiO2(CMAS)系基础玻璃,并在2.45 GHz多模腔微波炉中进行晶化处理,利用差热(DSC)分析、X射线衍射(XRD)分析、傅里叶红外光谱(FTIR)、拉曼光谱(Raman)、扫描电镜(SEM)和综合力学性能仪等测试手段,研究了微波热处理不同温度对CMAS系尾矿微晶玻璃显微结构及性能的影响。结果表明:采用微波法可以成功制得以透辉石(Mg(0.6)Fe(0.2)Al(0.2))Ca-(Si(1.5)Al(0.5))O6为主晶相的尾矿微晶玻璃,且随着热处理温度的升高,制得的微晶玻璃综合性能呈现先提高后降低的趋势。确定的最佳微波热处理制度为720℃保温20 min,此条件下所制备的微晶玻璃综合性能为:密度2.97 g/cm^3,抗折强度264.62 MPa,耐酸性99.38%,耐碱性99.17%,弹性模量、剪切模量分别为109.83 GPa和45.39 GPa。

CCaO-MgO-Al2O3-SiO2(CMAS)base glasses were prepared by the traditional melting-casting method using gold tailings and iron tailings as main materials,and crystallized in a 2.45 GHz multimode microwave cavity.The effect of microwave heat treatment temperature on the crystallization and properties was systematically investigated by differential thermal analysis(DSC),X-ray diffraction analysis(XRD),Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM)and universal mechanical properties tester,etc.The results show that:the tailing-based glass-ceramics with diopside(Mg 0.6 Fe 0.2 Al 0.2)Ca(Si 1.5 Al 1.5)O 6 as the primary crystalline phase was successfully synthesized by microwave heat treatment technology.Moreover,the performance of the prepared glass-ceramics were remarkably improved with heat treatment temperature increasing.Optimum technology parameters is heat treatment at 720℃for 20 min.The prepared glass ceramics possess excellent comprehensive performance:density of 2.97 g/cm 3,bending strength of 264.62 MPa,acid resistance of 99.38%,alkali resistance of 99.17%,elastic modulus of 109.83 GPa,and shear modulus of 45.39 GPa,respectively.