菱镁矿气泡模板法制备三水碳酸镁晶体及其生长机理

刘珈伊; 王余莲; 时天骄; 王琪浩; 朱益斌; 张俊; 于雨; 袁志刚

doi:10.13779/j.cnki.issn1001-0076.2022.02.015

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

摘要

摘要: 以菱镁矿为原料，采用气泡模板法制备三水碳酸镁(MgCO₃·3H₂O)晶体，探究CO₂、空气、N₂三种气泡对晶体物相组成与形貌的影响。结果表明: CO₂、空气、N₂辅助下，所得产物为形貌不同的三水碳酸镁晶体，N₂气泡对产物形貌具有调控作用。当通入尺寸为1 μm的N₂气泡60 min时，获得光滑棒状与放射状晶体; N₂气泡通入时间为120 min时，产物为多面体状与放射状晶体。N₂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。

Abstract: Nesquehonite (MgCO₃·3H₂O) crystals were prepared by the method for bubble template using magnesite as raw material. The effects of CO₂, air and N₂ 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 CO₂, air and N₂. When N₂ bubbles with a size of 1 μm 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 N₂ 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.

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