煅烧白云石粉制备微纳米级圆片状氢氧化镁  

Preparation of micro-nano round flake magnesium hydroxide from calcined dolomite powder

作　　者：范天博 胡婷婷 韩冬雪 贾晓辉 赵一波 王新安 郭洪范 李莉 刘云义 FAN Tianbo;HU Tingting;HAN Dongxue;JIA Xiaohui;ZHAO Yibo;WANG Xin′an;GUO Hongfan;LI Li;LIU Yunyi(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Liaoning Provincial Key Laboratory of Chemical Application Technology)

机构地区：[1]沈阳化工大学化学工程学院,辽宁省化工应用技术重点实验室,辽宁沈阳110142 [2]辽宁省化工过程工业智能化技术重点实验室

出　　处：《无机盐工业》2022年第1期29-33,共5页Inorganic Chemicals Industry

基　　金：国家自然科学基金(61102041);辽宁省高校创新团队支撑计划(2013010);国家科技支撑计划(2013BAB09B01);辽宁省教育厅项目(L2013169);辽宁省精细化工协同创新中心资助项目;辽宁省自然科学基金(201602582);辽宁省高等学校创新人才支持计划(LR2018078);辽宁省自然科学基金材料联合基金(20180510007);辽宁省自然科学基金指导计划项目(2019ZD0075);菱镁固废化工材料高值利用技术与基地集成示范(2020YFCI909300);辽宁省教育厅项目(LJKZ0431)。

摘　　要：以白云石为原料,通过氨法制备出高纯度(99.30%)圆片状的阻燃型微纳米级氢氧化镁。探究了反应温度、通氨速率、氨镁物质的量比对氢氧化镁分散性和形貌的影响,确定最佳工艺条件:反应温度为80℃、通氨速率为150 mL/min、氨镁物质的量比为23∶1。用扫描电镜、透射电子显微镜、X射线衍射仪、激光粒度分析仪、热重分析仪和白度仪表征产品的形貌、结构、粒度及稳定性。结果表明制得的圆片状微纳米级氢氧化镁的分散性好、晶型完整、粒度均匀,D_(50)为2.493μm、D_(90)为6.132μm、直径约为5.7μm、厚度约为0.7μm、长厚比约为8∶1。稳定性好、灼烧失量为31.03%、白度为97.4,高于工业氢氧化镁行业标准。Micro-nano-sized high-purity(99.30%)round flake magnesium hydroxide as the flame retardant was prepared from dolomite by ammonia method.The effect of reaction temperature,ammonia-passing rate,ammonia-magnesium molar ratio on the dispersion and morphology of magnesium hydroxide were investigated.The optimal process conditions were determined:reaction temperature was 80℃,ammonia-passing rate was 150 mL/min,and ammonia-magnesium molar ratio was 23∶1.The morphologies,structures,size distributions and stability of products were characterized through scanning electron microscope,transmission electron microscope,X-ray diffractometer,laser particle analyzer,thermogravimetric analyzer and whiteness meter.The results showed that the prepared round flake micro-nano-sized magnesium hydroxide flame retardant had high dispersibility,complete crystal shape,uniform particle size with D_(50)of 2.493μm,D_(90) of 6.132μm,diameter of about 5.7μm,thickness of about 0.7μm and length thickness ratio of about 8∶1.The stability was good,the ignition loss was 31.03%,and the whiteness was 97.4,which was higher than industrial magnesium hydroxide industry standard.

关 键 词：白云石 圆片状氢氧化镁 阻燃剂 

分 类 号：TQ132.2[化学工程—无机化工]