不同粒级铜尾矿对CaO-MgO-Al_(2)O_(3)-SiO_(2)微晶玻璃析晶性能的影响

Effect of Copper Tailings with Different Sizes on Crystallization Properties of CaO-MgO-Al_(2)O_(3)-SiO_(2)Glass-ceramics

采用不同粒级铜尾矿通过熔融法制备CaO-MgO-Al_(2)O_(3)-SiO_(2)(CMAS)微晶玻璃,通过差示扫描量热仪(DSC)、X射线衍射仪(XRD)和扫描电子显微镜-能谱仪(SEM-EDS)等测试方法分析了不同细度的铜尾矿对微晶玻璃析晶行为的影响,并借助JMA方程拟合了不同粒级铜尾矿微晶玻璃的析晶动力学行为。研究表明,不同粒级组成的铜尾矿中含铁矿物的种类和价态影响微晶玻璃的析晶行为。铜尾矿中的铁氧化物来源于原生矿物,如菱铁矿、硫铁矿、磁铁矿等含铁矿物多为Fe^(2+),不具备成核诱导作用且促进了玻璃体和中间体的形成,而外加氧化铁为Fe^(3+),具有较好的成核诱导作用并促进了高铁辉石晶相的析出,从而提高了微晶玻璃的各项性能。

Copper tailings with various particle sizes were melted to prepare CaO-MgO-Al_(2)O_(3)-SiO_(2)(CMAS)glass ceramics.DSC,XRD,and SEM-EDS were used to examine the crystallization properties of glass ceramics.JMA equation was used to fit the crystallization kinetics features of glass ceramics,which were made from copper tailings with various particles.The various kinds and valence states of iron-bearing minerals in copper tailings have distinct effects on the crystallization of glass-ceramics.Fe^(2+)-enriched minerals such as siderite,pyrite,and magnetite in copper tailings have no nucleation induction and promote the vitreous and intermediate phases.Therefore,the additional iron oxide of Fe^(3+)has a stronger nucleation induction,and enhances the precipitation of the ferro-pyroxene crystal phase,increasing the characteristics of glass ceramics.