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过程工程学报 ›› 2015, Vol. 15 ›› Issue (5): 824-830.DOI: 10.12034/j.issn.1009-606X.215248

• 过程与工艺 • 上一篇    下一篇

浓海水制备氢氧化镁颗粒的水热改性

刘婷婷 孙玉柱 孙泽 宋兴福 于建国   

  1. 华东理工大学化学工程联合国家重点实验室 华东理工大学化学工程国家重点实验室 华东理工大学 国家盐湖资源综合利用工程技术研究中心 华东理工大学资源与环境工程学院 华东理工大学盐湖工业技术研究中心
  • 收稿日期:2015-06-24 修回日期:2015-08-20 出版日期:2015-10-20 发布日期:2015-10-20
  • 通讯作者: 刘婷婷

Hydrothermal Modification of Mg(OH)2 Particles Prepared from Concentrated Seawater

LIU Ting-ting， SUN Yu-zhu, SUN Ze SONG Xing-fu, YU Jian-guo,   

  1. State key laboratory of Chemical Engineering, East China University of Science and Technology National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology College of resource and environmental engineering , the East of China University of Science and Technology Engineering Laboratory of Salt Lake，East China University of Science and Technology
  • Received:2015-06-24 Revised:2015-08-20 Online:2015-10-20 Published:2015-10-20
  • Contact: LIU Ting-ting，

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摘要： 将模拟浓海水和NaOH直接沉淀制备的Mg(OH)2水热处理得到Mg(OH)2阻燃剂粉体，考察了矿化剂和温度对其晶体形貌、结晶性及分散性的影响. 结果表明，在实验温度范围内，碱类矿化剂对晶体形貌的改善优于氯盐矿化剂；矿化剂浓度和水热温度越高，对晶体形貌改善越好，晶体粒径及厚度增加越快，且可减小晶体极性和微观内应变，提高结晶度和分散性. 在水热时间8 h、温度200℃、4.0 mol/L NaOH溶液为矿化剂条件下，可制备出粒度分布均匀、平均粒径约为0.250 mm、厚度约61 nm、团聚指数约为10.95的阻燃型Mg(OH)2.

关键词: 氢氧化镁, 浓海水, 水热改性, 阻燃剂

Abstract: Flame retardant magnesium hydroxide powder was prepared by hydrothermal modification method with magnesium hydroxide powder as raw material that was synthesized by precipitation of simulated concentrated seawater and sodium hydroxide. The effects of mineralizers and temperature on the morphology, crystalline structure and dispersion properties of hydrothermal products were examined. The magnesium hydroxide powder was characterized. The results show that alkali salts are superior to chlorine salts as mineralizers. In the experimental ranges, the higher the mineralizer concentration and temperature, the better the improved crystalline properties of product, such as more regular morphology, larger crystal size, greater plate thickness, less microstrain, superior crystallizability and dispersibility. Magnesium hydroxide particles as flame retardant with primary particle size about 0.250 mm, thickness of 61 nm and agglomeration number 10.95 can be obtained using 4.0 mol/L NaOH as mineralizer under the hydrothermal temperature of 200℃ and hydrothermal time of 8 h.

Key words: magnesium hydroxide, concentrated seawater, hydrothermal modification, flame retardant

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