摘要
以低品位菱镁矿与天然硅石为原料制备镁橄榄石材料。研究了低品位菱镁矿轻烧氧化镁粉引入量对制备的镁橄榄石材料中镁橄榄石的晶胞常数、微观结构及常温性能的影响。用X射线衍射(XRD)和扫描电镜(SEM)对试样的相组成和显微结构进行了研究。利用X′pert plus软件对试样中镁橄榄石相的晶胞常数进行分析。结构与性能分析结果表明:低品位菱镁矿中氧化镁与天然硅石中二氧化硅在高温条件下通过固相反应可以制备出以镁橄榄石为主晶相的镁橄榄石材料。随着低品位菱镁矿轻烧氧化镁粉引入量的增加,镁橄榄石材料中镁橄榄石相的晶胞常数和晶胞体积有增加趋势。同时,随着方镁石相在镁橄榄石材料中的脱溶作用,镁橄榄石材料的体积密度和强度逐渐降低,显气孔率和吸水率逐渐增加。
Forsterite material was prepared with low-grade magnesite and natural silica as raw materials.Effect of the adoption amount of light calcined magnesia powder from low-grade magnesite on lattice constant, microstructure, and room temperature performance of forsterite material was studied.XRD and SEM were used to characterize the sample＇s phase composition and mierostructure.The lattice constant of the forsterite phase in the sample was analyzed by X＇Pert plus software. Structure and properties analysis results showed ,forsterite material with forsterite as the main crystal phase could be prepared through solid reaction at high temperature between magnesia in low-grade magnesite and silica from natural silica.With the increase of light calcined magnesia powder from low-grade magnesite, the lattice constant and lattice volume of forsterite phase in the forsterite material presented increasing trend.Meanwhile ,the bulk density and cold crush strength of the samples were gradually on the decline, yet the apparent porosity and water absorption of the samples were gradually increasing due to the periclase＇s desol- vation role in the forsterite material.
出处
《无机盐工业》
CAS
北大核心
2012年第9期48-50,共3页
Inorganic Chemicals Industry
基金
辽宁科技大学大学生训练计划项目(LNKD0701)
鞍山市百千万科技创新项目(2011MS04)
关键词
低品位菱镁矿
硅石
镁橄榄石
固相反应
low-grade magnesite
natural silica
forsterite
solid reaction
