流化床脱水制无水氯化镁工艺研究  

Study on the Hydrochloride Complex Salt and Production of Anhydrous Magnesium Chloride in Fluidized Bed

作　　者：杨金鑫[1,2] 党杰[2] 吴玉龙[2,3] 杨明德[2] 袁建军[1] 多尼[2] 

机构地区：[1]天津科技大学天津市海洋资源与化学重点实验室,天津300457 [2]清华大学核能与新能源技术研究院,北京100084 [3]精细陶瓷北京市重点实验室,北京100084

出　　处：《盐业与化工》2012年第4期10-15,共6页Jounral of Salt and Chemical Industry

基　　金："十一五"国家科技支撑项目(No2008BAB35B05)

摘　　要：水氯镁石(六水氯化镁)脱水制无水氯化镁是盐湖镁资源利用的关键环节,复盐法是水氯镁石脱水的重要方法,由复盐合成、造粒及流态化热分解等步骤组成。采用热分析技术(TG-DTG)研究了复盐热解过程。结果显示,复盐热解主要分为两个阶段:第一个阶段脱去六个结晶水;第二个阶段脱去盐酸苯胺助剂,热重结果为后续实验提供理论依据。实验首先通过均匀液滴喷射技术(振动造粒)制备得到六水氯化镁-盐酸苯胺复盐颗粒。然后在流化床中进行复盐热分解脱水、脱助剂得到无水氯化镁。通过实验探索得到水氯镁石复盐流态化热分解的最佳工艺参数:脱水氮气流量1.6 m3/h～1.8 m3/h、脱盐酸苯胺氮气流量1.0 m3/h～1.2m3/h、脱水温度300℃、脱水时间0.5 h、脱盐酸苯胺温度350℃、脱盐酸苯胺时间1 h。Preparation of anhydrous magnesium chloride by dehydration of bischofite （ mag- nesium chloride hexahydrate） is the key point to the use of magnesium resources in salt lake. Doub- le salt method is an important method for bischofite dehydration with promising application pros- pects. It is composed of double salt synthesis, granulation and fluidization thermal decomposition, Behavior of double salt thermal decomposition is studied by the TG - DTG technique. The results show that the thermal decomposition of double salt can be divided into two steps ： six crystallized wa- ters are eliminated at first; and then, aniline hydrochloric is removed. TGA results offer the theoret- ical foundation for the follow - up thermal decomposition in fluidized bed. In the experiment, bischofite - aniline hydrochloride double salt particles are obtained by uniform droplet spray technol- ogy （vibration granulation）. And then, the crystal water and the additives are removed in fluidized bed. Finally, anhydrous magnesium chloride is obtained. Optimal process parameters of complex＇ s fluidized thermal decomposition can be obtained by experiment, which is as follows： nitrogen flow of dehydration and hydrochloride aniline taking off is 1.6 m3/h - 1.8 m3/h and 1.0 m3/h-1.2 m3/ h respectively, dehydration temperature is 300℃, for O. 5 h, temperature of hydrochloride anilinetaking off is 350℃ for 1 h.

关 键 词：六水氯化镁 盐酸苯胺 复盐 振动造粒 流化床 

分 类 号：TQ115[化学工程—无机化工]