摘要
以重镁水（Mg（HCO3）2）溶液为原料,采用热解法制备碱式碳酸镁。用X射线衍射（XRD）、扫描电子显微镜、热重-差热分析（TG-DTA）和比表面积仪对其进行表征,研究了影响反应诱导期、重镁水分解率、碱式碳酸镁形貌和比表面积的因素。结果表明：提高反应温度、降低反应压力,可以缩短反应诱导期,促进重镁水分解。反应压力为0.10 MPa、反应温度为40℃、分解时间0.5 h时,重镁水分解率为30.51%;升高温度至70℃,分解率为66.43%,比表面积随温度升高先增大后减小;在0.03 MPa和70℃时,重镁水的分解率为91.2%,随温度升高产品比表面积减小,产品形貌变化趋势为：棒状-片状颗粒-花球状。XRD和TG-DTA表征显示产品化学组成为：4MgCO3·Mg（OH）2·4H2O。
Basic magnesium carbonate was prepared via pyrolyzing magnesium bicarbonate solution. The parameter influences on the induction period, decomposition rate of magnesium bicarbonate solution, morphology and specific surface area of basic magnesium carbonate were investigated. The prepared samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy and thermogravimetry-differential thermal analysis（TG-DTA） and specific surface area analysis, respectively. The results show that increasing the reaction temperature, and decreasing the reaction pressure can shorten the induction period and promote the decomposition of Mg（HCO3）2. The decomposition rate is 30.51% at 0.1 MPa and 40 °C for 0.5 h. When the temperature increases to 70 °C, the decomposition rate is 66.43 %. The specific surface area firstly increases and then decreases with the increase of temperature. The decomposition rate is 91.2% at 0.03 MPa and 70 °C. The specific surface area decreases and the product morphology becomes rod, flaky, and flower-globose when the temperature increases. Based on the analysis by XRD and TG-DTA, the chemical composition is 4 MgCO3·Mg（OH）2·4H2O.
作者
常睿璇
丁珂
孙晓君
李会杰
黄娜娜
仇龙
高恩军
刘云义
李雪
CHANG Ruixuan1, DING Ke1, SUN Xiaojun1, LI Huijie1, HUANG Nana 1, QIU Long1, GAO Enjun1, LIU Yunyi1,2, LI Xue1,2(1. Liaoning Key Laboratory of Chemical Application, College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China; 2. Liaoning Collaborative Innovation Center of Fine Chemical Industry, Shenyang 110142, Chin)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2018年第7期922-928,共7页
Journal of The Chinese Ceramic Society
基金
辽宁省自然科学基金项目(L2015020609)
辽宁省创新团队项目(LT2013010)
沈阳市科技局项目(F16-208-6-00)
关键词
诱导期
低压热解
比表面积
形貌
induction period
low temperature pyrolysis
specific surface area
crystal morphology
