硅酸盐通报2018，Vol.37Issue(5)：1600-1604,5.
微晶菱镁矿制备硅钢氧化镁前驱体除钙工艺研究
Ca-Removing in the Preparation of the Precursor of Silicon-steel Grade Magnesium Oxide from Microcrystalline Magnesite
金汝 1刘百宽 2冯润棠 1田晓利 2李志勋 2杨树2
作者信息
- 1. 西安建筑科技大学材料与矿资学院,西安 710055
- 2. 濮阳濮耐高温材料(集团)股份有限公司技术中心,濮阳 457100
- 折叠
摘要
Abstract
Magnesium hydroxide (MH) emulsion was prepared using microcrystalline magnesite as raw material by lightly calcination and digestion.It is found that Ca impurities can be effectively removed by adding MgCl2 .In this paper, the Ca-removing effects of MgCl 2 content, reaction time, reaction temperature, calcination temperature and sintering time during the whole process of impurity removal was investigated .The experimental results showed that the Ca-removing effect on light burned magnesium was obviously improved by mixing MgCl2 .The preparation of high-purity MH precursor which contained 99.45％ of magnesium oxide and 0.20％ of calcium oxide includes the following steps :(1)calcining the microcrystalline magnesite at 920 ℃ for 2 h; (2)hydrating the light burned magnesium to be slurry ; (3)adding 8％ of MgCl2 into the slurry and reacting for 1.5 h.It is also proved that the Ca removal could be finished in a wide temperature range, and achieved a better and stable result in indoor environment .关键词
微晶菱镁矿/除钙/氯化镁/高纯氧化镁Key words
microcrystalline magnesite/Ca removal/magnesium chloride/high-purity magnesium oxide分类
化学化工引用本文复制引用
金汝,刘百宽,冯润棠,田晓利,李志勋,杨树..微晶菱镁矿制备硅钢氧化镁前驱体除钙工艺研究[J].硅酸盐通报,2018,37(5):1600-1604,5.
