化工矿物与加工2025，Vol.54Issue(4)：26-36,11.DOI:10.16283/j.cnki.hgkwyjg.2025.04.004
基于轻烧白云石-水化络合法的氧化镁制备工艺
Preparation process of magnesium oxide based on light burned dolomite-hydration complexation method
摘要
Abstract
China's dolomite resources are widely distributed,abundant in reserves,and easy to exploit,making it an important raw material for the preparation of magnesium series products.Magnesium oxide(MgO)has excellent properties such as fire resistance,insulation and magnetic conductivity,and has been widely used in building mate-rials,electronics,national defense and other fields.At present,the processes for extracting MgO from dolomite as raw material mostly have problems such as complex process,high cost,residue generation and serious pollution.In this paper,MgO was prepared by hydration complex method using light burnt dolomite as raw material.Firstly,Ca and Mg in dolomite were preliminarily separated by hydration method,and then Ca and Mg in hydration products were separated again by complexation process,and finally MgO with high purity was prepared.By investigating the mass fraction ratios of the main coexisting elements Li,Na,Ca,K,Fe,Cu and Mg in light-burned dolomite,the suitable calcination conditions for dolomite powder were determined as follows:calcination temperature of 900℃and calcina-tion time of 3 h.By investigating the mass fraction ratios of Ca to Mg in the hydration products,the suitable hydration conditions for light burnt dolomite were determined as follows:hydration temperature of 90℃,hydration time of 0.5 h,and stirring rate of 80 r/min.By investigating the purity of MgO extracted after complexation,the suitable comp-lexation conditions of hydration products were determined as follows:complexing agent solution pH=10,comp-lexation temperature 50℃,complexation time 20 min,and complexation stirring rate 60 r/min.Under these condi-tions,the purity of MgO extracted from light-burned dolomite reached 96.2%.The process proposed in this study has the advantages of low environmental pollution,low cost and no residue generation,providing a new method for the preparation of high-purity MgO.关键词
白云石/氧化镁/水化反应/络合反应/水化产物/煅烧Key words
dolomite/magnesium oxide/hydration reaction/complexation reaction/hydration products/element mass ratio/calcination分类
化学工程引用本文复制引用
仉崇,刘红伟,林仁鹏,张衡,王晓敏,王永祯..基于轻烧白云石-水化络合法的氧化镁制备工艺[J].化工矿物与加工,2025,54(4):26-36,11.基金项目
中央引导地方科技发展基金项目(YDZJSX2022B003). （YDZJSX2022B003）
