摘要
随着高纯二氧化硅材料需求的日益增长以及高品级石英原料的紧缺,采用其他硅质矿物资源代替天然水晶石制备高纯石英粉具有十分重要的意义。本文主要以普通硅石材料通过CO2沉淀法制得的高纯无定型Si O2为原料,分别在不同温度下煅烧,使其结晶转型,制得高纯晶体石英。采用X射线衍射(XRD)、TG-DSC、SEM等手段分别研究了高纯无定型Si O2在结晶过程中的相变行为,以及结晶过程中的体积与质量变化等。实验结果表明:高纯无定型Si O2约在1200℃时开始晶化,在1300℃时全部转化为方石英,其质量损失在7.19%,体积收缩率达到82.5%。
With the growing demand for high - purity silica material and the shortage of high - grade quartz material, the use of other siliceous mineral re- sources instead of natural rock crystal to produce high - purity quartz powder has a very important significance. In this paper, the raw materials mainly were the high - purity amorphous silica which was obtained by CO2 precipitation method, and respectively sintered them at different temperature to crystal- lization transformation to make the high - purity crystalline quartz materials, and then respectively studied the phase transition behavior and the changes of volume and quality in the process of high purity,sihca crystallization crystal through the X - ray diffraction （XRD） , TG - DSC, SEM, etc. The results showed that the high - purity silica began to crystallize at about 1200℃, and at 1300℃ all of the high - purity silica was converted into cristobalite, the weight lost 7.19%, and the volume shrinkage rate was 82.5%.
出处
《轻金属》
CSCD
北大核心
2015年第4期49-52,55,共5页
Light Metals
基金
国家自然科学基金(51204084)
云南省应用基础研究计划(2011FZ302)资助
关键词
高纯二氧化硅
煅烧
结晶
高纯石英粉
high - purity silica
calcine
crystallization
high - purity quartz powders
