利用硼镁石矿煅烧高活性氧化镁的试验研究  

Experiment study on preparation of high-activity magnesia by calcination of ascharite minerals

作　　者：徐冬[1] 李刚[1] 张显鹏[1] 郭清富[1] 马丽红[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《材料与冶金学报》2007年第2期122-125,共4页Journal of Materials and Metallurgy

基　　金：辽宁省政府镁资源保护办公室研究项目2005-27

摘　　要：高镁低硅硼镁石矿火法炼镁的实验中,煅烧生矿生成的氧化镁对金属镁的回收率有重要影响.为了得到高活性氧化镁,首先利用差热-热重法分析了高镁低硅型硼镁石矿的受热分解情况,然后测定了在选定煅烧温度及不同恒温时间下硼镁石矿的烧失率和灼减量,并利用柠檬酸法测定氧化镁的活性度,利用X射线衍射分析了在煅烧温度1 223 K、恒温1.0 h后矿石发生烧结.最终确定得到高活性氧化镁的硼镁石矿的煅烧温度范围在1 173～1 223 K、恒温0.5～1.0 h.最佳煅烧条件为煅烧温度1 223 K、恒温0.5 h.In the process of magnesium preparation from ascharite, the magnesia obtained by calcination is very important to the yield of magnesium . In order to obtain light calcined magnesia of high activity, the thermogravimetry method is applied to analyze the decomposition of ascharite minerals under different temperatures. The ignition loss rate of the ascharite minerals is measured for roasting at selected temperature for various holding time, and then the activity of the calcined magnesia is measured with the citric acid method. X-ray diffraction analysis is applied to analyze the sintered roasting product after rosting at 1 223 K for 1.0 h. As results, the suitable calcinations temperature range is 1 173～1 223 K and holding time is 0. 5 ～1. 0h. The optimum Calcinations temperature is 1 223 K and holding time is 0. 5 h.

关 键 词：硼镁石矿 煅烧 氧化镁 活性 

分 类 号：TF046.2[冶金工程—冶金物理化学]