镁橄榄石、矾土、石英砂合成堇青石的工艺研究  

Synthesis of cordierite from forsterite,bauxite and quartz sand

作　　者：余超[1] 祝洪喜[1] 邓承继[1] 员文杰[1] 周诗民 

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《耐火材料》2015年第6期432-434,445,共4页Refractories

基　　金：国家自然科学基金资助项目(51274156)

摘　　要：为了开辟镁橄榄石资源高效综合利用的新途径,以镁橄榄石、矾土及石英砂为主要原料,高温反应合成堇青石。利用X射线衍射、红外光谱以及扫描电子显微镜研究了煅烧制度（800~1 380℃并保温2~8 h）及过量石英砂（过量质量分数分别为5%、10%和15%）对合成堇青石的影响。结果表明：随煅烧温度的提高和保温时间的延长,堇青石相生成量增加,当煅烧制度为1 380℃保温8 h时,堇青石生成量达到最高。在相同煅烧制度下,添加过量石英砂无法提高堇青石纯度,但可以提升堇青石的致密化程度。显微形貌显示,过量的石英砂在高温下形成熔融相并覆盖在堇青石颗粒表面。To explore new routes to utilize forsterite resources,cordierite was synthesized using forsterite,bauxite and quartz sand as starting materials. The effects of firing schedule（ 800- 1 380 ℃ for 2- 8 h） and the quartz sand addition（ excess of 5%,10%,and 15% by mass percent） on the synthesis of cordierite were studied by XRD,infrared spectroscopy and SEM. The results show that as the firing temperature increases and the soaking duration prolongs,more cordierite forms. The maximum cordierite can be achieved by synthesizing at 1 380 ℃ for 8 h. With the same firing schedule,the excessive quartz sand addition cannot enhance the purity of cordierite but can improve the density of cordierite. The microstructure shows that excess quartz sand can form melting phases covering on the surfaces of the cordierite particles.

关 键 词：堇青石 镁橄榄石 矾土 石英砂 

分 类 号：TQ175[化学工程—硅酸盐工业]