低硅铁尾矿高强度微晶泡沫玻璃的研制  

Development of High Strength Microcrystalline Foamed Glass for Low Silicon Iron Tailings

作　　者：孙强强 杨文凯 李兆 SUN Qiang-qiang;YANG Wen-kai;LI Zhao(College of Chemical Eengineering and Modern Materials/Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,Shaanxi)

机构地区：[1]商洛学院,化学工程与现代材料学院/陕西省尾矿资源综合利用重点实验室,陕西商洛726000

出　　处：《商洛学院学报》2020年第4期26-32,共7页Journal of Shangluo University

基　　金：陕西省教育厅重点科学研究项目(17JS036);陕西省尾矿资源综合利用重点实验室开放基金项目(2017SKY-WK014)。

摘　　要：利用商洛市大西沟低硅铁尾矿为主要原料,以废玻璃为增硅剂,碳酸钙为发泡剂,二氧化钛和氟化钙作为复合晶核剂,采用粉末法二次烧结工艺制备微晶泡沫玻璃。借助扫描电镜(SEM)、X射线衍射(XRD)及热重差热分析(TG-DSC)等测试手段,研究了铁尾矿掺入量、发泡剂种类及用量、发泡温度及时间、晶化温度及时间对微晶泡沫玻璃的抗压强度、表观密度及热导率的影响。结果表明:当铁尾矿掺入量为45%,发泡剂碳酸钙加入量为2.0%时,在900℃时发泡25 min,1150℃微晶化处理2 h后制得了孔径1.6~2.0 mm,表观密度为1.335 g·cm^-3,抗压强度19.78 MPa,热导率为0.095 W·(m·k)^-1的微晶泡沫玻璃。High-performance foam glass ceramics were prepared with the application of powder secondary sintering using the low silicon iron tailings producing from Daxigou in Shangluo as the main raw material,waste glass as silicatization agent,calcium carbonate as foaming agent,titanium dioxide and calcium fluoride as composite crystal nucleating agents.By virtue of SEM,XRD and TG-DSC,the effects of iron tailings incorporation,type and amount of foaming agent,foaming temperature and time,crystallization temperature and time on the compressive strength,apparent density and thermal conductivity of foam glass ceramics were discussed.Results show that when the content of iron tailings is 45%,the amount of foaming agent is 2.0%,foamed for 25 min at 900℃and then crystallized at 1150℃for 2 h,the highstrength foam glass ceramics was prepared with the pore diameter of 1.6~2.0 mm,the apparent density of 1.335 g·cm^-3,the compressive strength of 19.78 MPa and the thermal conductivity of 0.095 W·(m·k)^-1.

关 键 词：低硅铁尾矿 微晶泡沫玻璃 透辉石相 尾矿掺量 

分 类 号：X753[环境科学与工程—环境工程]