摘要
基于石棉尾矿中富含氧化镁组分的特点,在矿物学特征研究基础上,采用硫酸铵焙烧法提取氧化镁,利用浸出液硫酸镁制备碱式碳酸镁。采用XRD、SEM、FT-IR和TG-DTA对不同温度条件下所获得的产物的物相、形貌、分子振动光谱和热效应变化等特征进行了分析和表征。结果表明:利用硫酸铵焙烧产物的浸取液,在低于65℃的水溶液中所制备的产物为针状水合碳酸镁;在高于85℃时制备的产物为片状碱式碳酸镁;在75℃温度时形成短柱状或颗粒状水合碳酸镁和片状碱式碳酸镁的混合物。对水合碳酸镁加热,在100℃脱去部分水合水和二氧化碳后转变为片状碱式碳酸镁。研究结果对石棉尾矿的资源化利用和环境保护具有一定的理论和实际意义。
Based on the characteristics of magnesium oxides which are very abundant in the chrysotile asbestos tailing and mineralogical research on asbestos tailings,the authors employed the ammonium sulfate calcination method to extract magnesium from asbestos tailing,and used the leaching liquid as the raw material to prepare the basic magnesium carbonate.The influence of the reaction temperature on the phase,morphology and structure of the product during the preparation of the basic magnesium carbonate were characterized by means of XRD,SEM,FT-IR and TG-DTA.The results indicated that the products were needle-like magnesium carbonate hydrate at the temperatures below 65℃,flake-like magnesium carbonate hydrate at the temperatures higher than 85℃,and short column-like or granule-like magnesium carbonate hydrate and flake-like magnesium carbonate hydrate at 75℃.Heated magnesium carbonate hydrate would remove part of H2O and CO2,which turned into flake-like basic magnesium over 100℃.Research performed in this paper has some theoretical and practical significance for environmental protection and comprehensive utilization of chrysotile asbestos tailings.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2013年第6期911-917,共7页
Acta Petrologica et Mineralogica
基金
四川省科技厅项目(11zs2003)
固体废物处理与资源化教育部重点实验开放基金(12zxgk04)
西南科技大学研究生创新基金(13ycjj25)
关键词
石棉尾矿
水合碳酸镁
反应温度
碱式碳酸镁
asbestos tailing
magnesium carbonate hydrate
reaction temperature
basic magnesium carbonate
