化工环保2024，Vol.44Issue(3)：427-431,5.DOI:10.3969/j.issn.1006-1878.2024.03.017
热处理温度对菱镁尾矿合成Mg2SiO4-MgAl2O4-MgO复相砂的影响
Influenceof heat treatment temperature on synthesis of Mg2SiO4-MgAl2O4-MgO complex sand from magnesite tailings
摘要
Abstract
Mg2SiO4-MgAl2O4-MgO complex sand was synthesized byadding 12%(w)Al2O3 to magnesite tailingsby means of the solid phase method.The influenceof heat treatment temperature on the mineral phase composition and microstructure of the synthesized complex sand was investigated.The results show thatMg2SiO4-MgAl2O4-MgO complex sand can be synthesized at a heat treatment temperature of 1 400-1 600℃,and the increase inheat treatment temperature will enhance thecontent of magnesium-aluminum spinel in complex sand and improve the development degree of magnesium-aluminum spinel and forsterite crystals.Complex sand synthesized at 1 600℃has a well-developed crystal structure,with the highest density.After heat treatment at 1 400℃,the sample is loose and has a large number of pores.Forsterite is distributed in the pore wall,and magnesium-aluminum spinel is distributed in the pores.With the increase inheat treatment temperature,the forsterite and magnesium-aluminum spinel crystals rapidly grow.At the same time,the Fe3+and Ca2+impurities in the magnesite tailings will form solid solutions with the forsterite and magnesium-aluminum spinel.The increase in heat treatment temperature and the formation of solid solutions promote the sintering densification of the sample,increase the bulk density,and decrease the apparent porosity.关键词
菱镁尾矿/热处理温度/复相砂/镁橄榄石/镁铝尖晶石/显微结构Key words
magnesite tailings/heat treatment temperature/complexsand/forsterite/magnesium-aluminum spinel/microstructure分类
资源环境引用本文复制引用
林浩鑫,田琳,刘晓妍,解重重,宋博,李国华..热处理温度对菱镁尾矿合成Mg2SiO4-MgAl2O4-MgO复相砂的影响[J].化工环保,2024,44(3):427-431,5.基金项目
国家自然科学基金项目(U20A20239). （U20A20239）
