高钛高炉渣制备微晶石材的体系设计及制备研究

System Design and Preparation of Glass-ceramics Using Titanium Blast Furnace Slag

以攀枝花高钛型高炉冶金渣为主原料制备微晶石材,以Ca O-Al_2O_3-Si O_2玻璃体系为基础,采用DSC、XRD、SEM等分析技术,研究不同晶核剂体系对高钛型矿渣玻璃的析晶特性、组织结构和性能的影响。结果表明,以攀枝花高钛型高炉渣为主原料,在高添加比(>60%)情况下制备微晶石材是可行的,渣中适量的Ca O和较多的TiO_2可以形成稳定的基础玻璃,通过引入Fe/Cr复合晶核剂或者Ti/Zr复合晶核剂,可促进基础玻璃的析晶过程,获得较高的结晶度;其中以F、S为晶核剂的玻璃析晶能力较差。获得的微晶石材以辉石、榍石等为主要晶相,组织结构受晶核剂类型的影响略有差异,该类型矿渣微晶石材性能优异,抗弯强度达90 MPa,耐酸碱性能远优于普通高炉渣微晶石材。

A new CaO-Al2O3-SiO2glass-ceramics were prepared using natural cooling titanium blast furnace slag,and the effects of different systems of nucleating agents on the crystallization,microstructure and properties of the glass-ceramics were also studied by DSC,XRD,SEM,etc. The results indicate that highperformance glass-ceramics could be obtained by adding a large amount of titanium blast furnace slag（ 60%）,and the moderate concentration of CaO and higher TiO2 content in this slag serve as effective constitution in terms of promoting the stabilization of glass structure. By introducing Fe/Cr and Ti/Zr nucleating agents,the crystallization of base glass can be promoted and a higher crystallinity can be obtained. The nucleation and crystallization are poor with F/S agents. The major crystalline phases are Diopside and sphene,and the microstructure slightly varies with different nucleating agents. The obtained glass-ceramics have excellent properties with 90 MPa of flexural strength,and chemical durability far superior to that of other common glass-ceramics.