搅拌时间对水合碳酸镁形貌和组成的影响  

Influence of Stirring Time on the Morphology and Composition of Magnesium Carbonate Hydrates

作　　者：郑亚君[1] 党利琴[1] 张智平[2] 雷志斌[1] 陈吉平[2] 

机构地区：[1]辽宁师范大学功能材料化学研究所,辽宁大连116029 [2]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《精细化工》2007年第9期835-838,869,共5页Fine Chemicals

基　　金：国家自然科学基金(20577050);国家重点基础研究计划(2003CB415001)资助课题~~

摘　　要：通过共沉淀法，研究了Mg（NO3）2·6H2O和K2CO3生成水合碳酸镁的形貌和组成随反应初始溶液搅拌时间的变化规律。结果发现，当反应初始溶液的搅拌时间在1～8min变化时，可使产物针状水合碳酸镁的直径控制在0．5～23μm，长度介于2～200μm；通过对产物组成的红外光谱和热重分析，发现当搅拌时间在1～20min变化时，所得产物MgCO3·xH2O（1〈x〈3）中的水分含量也随之发生较大变化。Magnesium carbonate hydrates were facilely synthesized by the precipitation of Mg（ NO3 ）2 · 6H2O and K2CO3in aqueous solutions, and their morphologies and compositions were characterized by SEM, FTIR spectroscopy and TGA. SEM observation demonstrates that the needlelike magnesium carbonate hydrates with variable sizes, ranging from 0.5 to 23 μm in diameter and 2 to 200μm in length, can be synthesized by adjusting carefully the stirring time of the initial reaction solution in the range of 1 -8 min. IR and TG analyses indicate that the stirring time has a significant effect on the content of water of magnesium carbonate hydrates besides their morphologies, and the corresponding composition has a simple formula of MgCO3 · xH2O,in which the value of x is between 1 -3 with the variety of stirring time from 1 to 20 min.

关 键 词：水合碳酸镁 搅拌时间 形貌 组成 功能材料 

分 类 号：TQ132.2[化学工程—无机化工]