CaO/MgO对花岗岩尾矿微晶玻璃物相和性能的影响

摘要/Abstract

摘要： 以花岗岩尾矿为主要原料(掺入质量分数:56%),TiO₂为主晶核剂,适量Na₂SiF₆为助熔剂和晶核剂,添加部分辅助原料,采用整体析晶法,制备了R₂O-CaO-MgO-Al₂O₃-SiO₂系花岗岩尾矿建筑微晶玻璃。研究了CaO/MgO质量比对微晶玻璃析晶能力、物相、微观结构及性能的影响。结果表明:CaO/MgO质量比的增加有利于增强基础玻璃的析晶能力,当CaO/MgO质量比≤0.88时,微晶玻璃的主晶相为钙长石和角闪石,当CaO/MgO质量比＞0.88时,主晶相转变为钙长石,且钙长石衍射峰的强度随着CaO/MgO质量比的增加而增大;随CaO/MgO质量比的增加,晶体数量逐渐增多,晶粒尺寸增大;微晶玻璃的体积密度和显微硬度随CaO/MgO质量比的增加呈先增大后减小的趋势,当CaO/MgO质量比为0.57时,体积密度达到最大值2.752 5 g/cm³,当CaO/MgO质量比为0.71时,显微硬度达到最大值为8.6 GPa。

关键词: 微晶玻璃, 花岗岩尾矿, 整体析晶法, CaO/MgO质量比, 角闪石, 钙长石

Abstract: The R₂O-CaO-MgO-Al₂O₃-SiO₂ building glass-ceramics have been synthesized by the method of monolithic crystallization. The granite tailings (mass fraction: 56%), TiO₂, and Na₂SiF₆ were used as the main raw material, main nucleating agent, and flux and nucleating agent, respectively. The effect of CaO/MgO mass ratio on the crystallization capacity, crystal phase composition, microstructure and properties of glass-ceramics were investigated. The results show that the increase of CaO/MgO mass ratio is beneficial to the crystallization of parent glasses. When the CaO/MgO mass ratio is lower than 0.88, the main crystalline phases of glass-ceramics are anorthite and hornblende, otherwise, the main crystallize phase transforms into anorthite. Based on the results of XRD, the diffraction peak of anorthite become stronger with CaO/MgO mass ratio increasing. Besides, with the increase of CaO/MgO mass ratio, the number of crystals and grain size gradually increased, the volume density and microhardness increase first and then decrease. When the mass ratio of CaO/MgO is 0.57, the volume density has a maximum value of 2.752 5 g/cm³. Furthermore, the microhardness reaches the maximum value of 8.6 GPa as the CaO/MgO mass ratio is 0.71.

Key words: glass-ceramics, granite tailing, method of monolithic crystallization, CaO/MgO mass ratio, hornblende, anorthite

中图分类号:

TQ171

罗云龙, 王辅, 竹含真, 廖其龙, 徐国梁, 刘来宝, 张礼华. CaO/MgO对花岗岩尾矿微晶玻璃物相和性能的影响[J]. 硅酸盐通报, 2021, 40(12): 4102-4108.

LUO Yunlong, WANG Fu, ZHU Hanzhen, LIAO Qilong, XU Guoliang, LIU Laibao, ZHANG Lihua. Effect of CaO/MgO Mass Ratio on Phases and Properties of Glass-Ceramics Prepared from Granite Tailings[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4102-4108.

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