三水碳酸镁法制备碱式碳酸镁过程研究

发布时间：2018-04-27 20:50

  本文选题：菱镁矿 + 碱式碳酸镁　； 参考：《矿产保护与利用》2017年04期

【摘要】：以菱镁矿为原料,先合成MgCO_3·3H_2O晶须,并以此为前驱体,制备了高纯414型碱式碳酸镁,主要研究机械搅拌作用对结晶过程的影响。利用X射线衍射(XRD)和扫描电镜(SEM)分析了碱式碳酸镁物相组成及微观形貌。结果表明,搅拌有助于加快相转变进程,热解温度70℃,搅拌作用下,60 min时,MgCO_3·3H_2O全部转变为形貌均匀的多孔棒状4MgCO_3·Mg(OH)_2·4H_2O;而无搅拌作用下,90 min时MgCO_3·3H_2O全部转变为多孔玫瑰花状4MgCO_3·Mg(OH)_2·4H_2O微球。4MgCO_3·Mg(OH)_2·4H_2O晶体中,Mg~(2+)呈现两种不同的正八面体配位,MgO_6正八面体通过共顶点和共棱的方式连接而成,分别沿[100]和[001]方向快速生长,最终形成球状或棒状形貌。
[Abstract]:Using magnesite as raw material, MgCO_3 3H_2O whisker was synthesized and used as precursor to prepare high purity 414-basic magnesium carbonate. The effect of mechanical stirring on crystallization process was studied. The phase composition and microstructure of basic magnesium carbonate were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that stirring helps to accelerate the phase transition process, and the pyrolysis temperature is 70 鈩，

本文编号：1812302