采用碳化-沉淀法制备纤维状纳米Mg(OH)_2的研究  

Preparation of Fiber-Shaped Nano-Mg(OH)_2 with Carbonization-Precipitation Method

作　　者：刘家祥[1] 欧龙[1] 勇昕[1] 

机构地区：[1]材料电化学过程与技术北京市重点实验室,北京化工大学材料科学与工程学院,北京100029

出　　处：《无机化学学报》2014年第5期1068-1072,共5页Chinese Journal of Inorganic Chemistry

基　　金：武钢矿业有限责任公司重点科技创新课题资助项目

摘　　要：本文以轻烧自云石粉料为原料，用碳化法制备出碱式碳酸镁，酸化后以氨水为沉淀剂，用化学沉淀法制得Mg（OH）2，用乙二胺对制得的Mg（OH）2进行后处理，制得纤维状纳米Mg（OH）2。用SEM、XRD和TG－DTA对制得的Mg（OH）2进行表征。XRD结果表明重结晶温度180℃以上可以得到具有完整晶体结构的Mg（OH）2。SEM结果显示Mg（0H）2颗粒的尺寸随着乙二胺加入量的增大而增大。当Mg（OH）2的重结晶时间超过21h后，可以得到直径20－30nm，长度400～700nm的纤维状Mg（OH）2。TG-DTA表明Mg（OH）2在318～416℃分解为MgO。In this paper, light-burned dolomite was used as the raw material to prepare fibroid nano-Mg（OH）〉 First of all, basic magnesium carbonate （BMC） was prepared by carbonizing light-burned dolomite. Secondly by adding ammonia water used as precipitator to BMC which was acidulated, Mg（OH）2 was prepared by chemical precipitation method. At last, ethanediamine was used to reprocess Mg（OH）2 to control the recrystallization for fibroid nano-Mg（OH）〉 The fibroid nano-Mg（OH）2 was characterized by SEM, XRD and TG-DTA methods. The XRD results indicated that the fibroid nano-Mg（OH）2 with perfect crystal were obtained when the recrystallization temperature was above 180 ℃. SEM analysis showed that the grain size increased with the increase of ethanediamine. The effect of recrystallization time on the Mg（OH）2 crystal showed that fibroid nano-Mg（OH）2, with 20-30 nm in diameter and 400-700 nm in length, were observed after 21 hours heating retreatment. The TG DTA results showed that Mg（OH）2 would decompose to MgO at temperature range of 318～416 ℃

关 键 词：轻烧白云石 碳化法 氢氧化镁 颗粒形貌 乙二胺 

分 类 号：O614.22[理学—无机化学]