菱镁矿混合氯化镁焙烧制备高纯氧化镁

发布时间：2017-12-28 18:16

本文关键词：菱镁矿混合氯化镁焙烧制备高纯氧化镁　出处：《无机盐工业》2016年12期 　论文类型：期刊论文

【摘要】：采用菱镁矿添加无水氯化镁混合焙烧的方式,在较低焙烧温度下制备了高纯度的氧化镁。通过热重-差热(TG-DTA)法分析了菱镁矿的焙烧反应过程,并对焙烧产品进行了X射线衍射(XRD)、扫描电镜(SEM)及纯度分析。与传统焙烧方法制备氧化镁相比,添加氯化镁的焙烧工艺可有效地达到除钙效果。通过机理探讨表明,氯化镁渗透到菱镁矿中起隔断作用,有效增加了菱镁矿的比表面积,降低了焙烧温度,达到了节能降耗的效果。在焙烧温度为650℃、保温时间为1 h条件下,所得氧化镁的纯度可达99.3%,钙杂质质量分数可降至0.07%。
[Abstract]:High purity Magnesium Oxide was prepared by mixed calcination of magnesite with anhydrous magnesium chloride at low calcination temperature. The roasting reaction process of magnesite was analyzed by thermogravimetric differential thermal (TG-DTA) method, and the X XRD (X-ray diffraction), scanning electron microscope (SEM) and purity analysis of the roasted products were carried out. Compared with the traditional calcined Magnesium Oxide, the calcination process of adding magnesium chloride can effectively achieve the effect of removing calcium. Through mechanism discussion, it shows that magnesium chloride penetrates into magnesite and plays a role of partition. It effectively increases the specific surface area of magnesite, reduces the calcination temperature, and achieves the effect of energy saving and consumption reduction. Under the conditions of 650 centigrade calcination temperature and 1 h holding time, the purity of the obtained Magnesium Oxide can reach 99.3% and the mass fraction of calcium impurity can be reduced to 0.07%.
【作者单位】：教育部超重力工程研究中心北京化工大学;
【基金】：国家海洋局海洋公益性科研项目(20100521)
【分类号】：TQ132.2
【正文快照】： 氧化镁是一种重要的无机材料,其纯度是评价其性能的重要指标之一。高纯氧化镁一般指纯度达到99%以上的氧化镁,它具有导热性好、介电损失小、耐腐蚀等特性,在电子通讯、塑料橡胶、航空航天、医疗器材及食品等行业有广泛的应用,同时高纯氧化镁也是制造高纯镁砂、硅钢氧化镁的原

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