Preparation of high pure nano-magnesium hydroxide from bittern and lime

• 作 者: DUZhenlei;HaiHaibo;LiAOYong;CUIWenhao;ShanJunjie;LiQing;JIJunrong;JINJing;LIUShirui;
• 机 构: College of Chemical & Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazh
• 出 处: 第五届全国化工年会
• 发表日期: 2008年期

This paper presents a new technics process of preparation of high pure magnesium hydroxide from bittern and lime. At the temperature of 20℃～95℃，put milk of lime and bittern into a reactor simultaneity at a certain speed and keep the PH value of the slurry between 8.0.～10.0. After the reaction finishing，continue to stir the slurry for 1h-4h. Then filtrate the slurry and treat the cake with specific romoving calcium technidue. Then dry the cake at the temperature of 105-120℃ for 5h. The content of magnesium hydroxide in the product is more than 98％，while calcium oxide content lower than 0.5％. Decomposition temperature is 394℃，TGA is 30.9％，Specific Surface Area is 39.2m2/g. The product morphology is characterized by scanning electron microscopy and the result indicates that the product is lamellar and the particle size is about 80nm. This production process issimple and is a relatively clean synthesis technology line and production cost is low. The quality of products meet the state industry standard and foreign enterprise standard.