菱镁矿气泡模板法制备三水碳酸镁晶体及其生长机理  

Preparation and Growth Mechanism of Nesquehonite Crystal Crystals by Bubble Template Method with Magnesite

作　　者：刘珈伊 王余莲[1] 时天骄 王琪浩 朱益斌 张俊 于雨 袁志刚[1] LIU Jiayi;WANG Yulian;SHI Tianjiao;WANG Qihao;ZHU Yibin;ZHANG Jun;YU Yu;YUAN Zhigang(School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, Liaoning, China)

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159

出　　处：《矿产保护与利用》2022年第2期114-119,共6页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金(51804200)。

摘　　要：以菱镁矿为原料,采用气泡模板法制备三水碳酸镁(MgCO_(3)·3H_(2)O)晶体,探究CO_(2)、空气、N_(2)三种气泡对晶体物相组成与形貌的影响。结果表明:CO_(2)、空气、N_(2)辅助下,所得产物为形貌不同的三水碳酸镁晶体,N_(2)气泡对产物形貌具有调控作用。当通入尺寸为1μm的N_(2)气泡60 min时,获得光滑棒状与放射状晶体;N_(2)气泡通入时间为120 min时,产物为多面体状与放射状晶体。N_(2)气泡充当泡界模板,晶体沿着气泡表面生长形成新的棒状三水碳酸镁分枝,最终构筑成不规则多面体状和放射状三水碳酸镁晶体。Nesquehonite(MgCO_(3)·3H_(2)O)crystals were prepared by the method for bubble template using magnesite as raw material.The effects of CO_(2),air and N_(2) bubbles on the phase composition and morphology of the crystals were investigated.The results showed that the products obtained are nesquehonite crystals with different morphologies under the assistance of CO_(2),air and N_(2).When N_(2) bubbles with a size of 1μm are introduced for 60 min,the obtained products are smooth rod-like and radial crystals;when bubbles are introduced for 120 min,the obtained products are polyhedral and radial crystals.The N_(2) bubbles were used as bubble boundary templates,and the crystals grew along the surface of the bubbles to form new rod-like branches of nesquehonite.Finally,irregular polyhedral and radial nesquehonite crystals were constructed.

关 键 词：菱镁矿 三水碳酸镁 气泡 机理 

分 类 号：TD985[矿业工程—选矿] TQ132.2[化学工程—无机化工]