CaO/MgO对花岗岩尾矿微晶玻璃物相和性能的影响  

Effect of CaO/MgO Mass Ratio on Phases and Properties of Glass-Ceramics Prepared from Granite Tailings

作　　者：罗云龙 王辅[1] 竹含真 廖其龙[1] 徐国梁 刘来宝[1] 张礼华[1] LUO Yunlong;WANG Fu;ZHU Hanzhen;LIAO Qilong;XU Guoliang;LIU Laibao;ZHANG Lihua(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010

出　　处：《硅酸盐通报》2021年第12期4102-4108,4127,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划“固废资源化”重点专项(2019YFC1904900);国家自然科学基金(51702268,51808464);环境友好能源材料国家重点实验室自主课题(18fksy0212,20fksy09)。

摘　　要：以花岗岩尾矿为主要原料(掺入质量分数:56%),TiO_(2)为主晶核剂,适量Na_(2)SiF_(6)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R_(2)O-CaO-MgO-Al_(2)O_(3)-SiO_(2)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2.7525 g/cm^(3),当CaO/MgO质量比为0.71时,显微硬度达到最大值为8.6 GPa。The R_(2)O-CaO-MgO-Al_(2)O_(3)-SiO_(2) building glass-ceramics have been synthesized by the method of monolithic crystallization.The granite tailings(mass fraction:56%),TiO_(2),and Na_(2)SiF_(6) 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 2.7525 g/cm^(3).Furthermore,the microhardness reaches the maximum value of 8.6 GPa as the CaO/MgO mass ratio is 0.71.

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 

分 类 号：TQ171[化学工程—玻璃工业]