氢氧化镁制备活性MgO及MOC的工艺研究  

Study on the Technology of Preparing Active MgO and MOC from Magnesium Hydroxide

作　　者：阿旦春 肖学英[1] 文静[1] 董金美[1] 郑卫新[1] 常成功[1] A Danchun;Xiao Xueying;Wen Jing;Dong Jinmei;Zheng Weixin;Chang Chenggong(Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining,Qinghai,China;University of Chinese Academy of Sciences,Beijing,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院青海盐湖资源综合高效利用重点实验室,青海省盐湖资源化学重点实验室,青海西宁810008 [2]中国科学院大学,北京100049

出　　处：《矿产综合利用》2022年第3期17-26,57,共11页Multipurpose Utilization of Mineral Resources

基　　金：青海省科技成果转化专项(2019-GX-165);西宁市重大科技专项(2019-Z-08)

摘　　要：柴达木地区盐湖镁资源储量丰富,伴随锂和钾资源的开发利用会副产大量的富镁副产物。为提高盐湖镁资源利用率,本文以MgCl_(2)与电石渣制备的Mg(OH)_(2)为原料,研究煅烧工艺对煅烧产物粒径、比表面积、活性MgO含量、凝结时间的影响,并以煅烧产物为原料制备MOC试件,研究煅烧温度和原料配比对MOC试件的影响。研究结果表明:随煅烧温度的升高和保温时间的延长,煅烧产物的比表面积逐渐降低,粒径呈先降低后增加的趋势;随煅烧温度升高和保温时间的延长,煅烧产物中活性MgO含量逐渐增加,煅烧产物的凝结时间逐渐延长。当原料的煅烧温度为600℃,活性MgO与MgCl_(2)摩尔比为6,MgCl_(2)溶液波美度为27时MOC试件抗压强度较高,且抗压强度随龄期延长而逐渐增加。The salt lakes in Qaidam area are rich in magnesium resources.Along with the development and utilization of lithium and potassium resources a large amount of magnesium-rich by-products will be produced as by-products.In order to improve the utilization rate of magnesium resources,this article uses Mg(OH)_(2)prepared from calcium carbide slag and MgCl_(2)as raw materials to study the effect of the calcination process on the particle size,specific surface area,reactive MgO content and setting time of the calcined product.MOC specimens were prepared from the calcined products.The effects of calcining temperature and raw material ratio on the MOC specimens were studied.The results of the study show that the specific surface area of the calcined product decreases gradually with the increase of the calcination temperature and the extension of the holding time,and the particle size tends to decrease first and then increase.With the increase of calcination temperature and the extension of holding time,the reactive MgO content in the calcined product and the setting time of the calcined product increases gradually.When the calcination temperature of the raw material is 600℃,the molar ratio of reactive MgO to MgCl_(2)is 6,and the Baume degree of the MgCl_(2)solution is 27,the compressive strength of the MOC specimen is high,and the compressive strength gradually increases with age.

关 键 词：氯氧镁水泥 氢氧化镁 煅烧工艺 原料配比 抗压强度 

分 类 号：TD989[矿业工程—选矿]