以白云鄂博二次选后尾矿和粉煤灰为主要原料,采用熔融法制备得到了CaO-MgO-Al2O3-SiO2系尾矿微晶玻璃.制备流程包括熔融、退火、核化及晶化过程.其中玻璃熔融温度为1450℃,核化温度为720℃,晶化温度为850℃.利用XRD研究了基础玻璃成分配比对微晶玻璃结构的影响.结果表明基础玻璃成分配比直接决定微晶玻璃的主晶相形成.随着基础玻璃成分配比的变化,微晶玻璃可能形成辉石相、钙长石相、镁铁尖晶石相或磁铁矿相.当其他元素固定,CaO/MgO和CaO/Al2O3比值的减小会导致微晶玻璃由辉石相转变为镁铁尖晶石相和钙长石相.而当SiO2/CaO比值大于2时,主晶相则由辉石相转变为磁铁矿相.DTA测试结果表明CaO有利于析晶温度的降低,而MgO、Al2O3和SiO2相对提高了析晶温度.力学性能测试表明抗折强度、密度、耐酸碱度与微晶玻璃主晶相有直接关系.主晶相为辉石相的微晶玻璃具有更高的抗折强度、密度和耐酸性.
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