SONG Bei 1 ， LIU Chao 1 ， ZHENG Shuilin 1 ， WANG Tongtong 1 ， ZHAO Jian 1 ， LI Li 2
（School of Chemical and Environment Engineering, China University of Mining and Technology (Beijing), Beijing 100083; 2. Zhongfei Geological Engineering Exploratim Academy, Beijing 100102, China）
Abstract: Taking the sulfuric acid extract of asbestos tailings as raw materials， magnesium hydroxide was prepared by ammonia precipitation method after oxidation and removing iron. The effect of ammonia amount, reaction temperature and reaction time on the preparation of magnesium hydroxide was studied. The magnesium hydroxide samples were characterized. The results show that the optimal conditions of preparing magnesium hydroxide using sulfuric acid extract of asbestos tailings are that the ammonia volume is 150 mL needed by 200 mL acid infusion, the reaction temperature is 70 ℃ and the reaction time is 40 min. Under the optimal conditions, the purity of prepared magnesium hydroxide is 93.31%, the median particle size d50 is 8.42 μm, the specific surface area is 35.14 m2/g and the whiteness is 98.6% . It can be drawn from X ray diffraction analysis that the magnesium hydroxide well crystallizes.
Keywords: asbestos tailing; acid leaching solution; ammonia; magnesium hydroxide
中图分类号：TD98 文献标志码：A
文章编号：1008-5548（2014）02-0072-03
DOI:10.13732/j.issn.1008-5548.2014.02.017
收稿日期：2013-09-30， 修回日期：2013-10-31，在线出版时间：2014-05-04。
第一作者简介：宋贝(1987—)，男，博士研究生，研究方向为无机非金属矿物材料。 电话：13701386534，E-mail：songbeiii@163.com。
通信作者简介：郑水林(1956—)，男，博士，教授，研究方向为资源综合利用与非金属矿深加工、粉体制备与表面处理、非金属矿物材料与环境材料。 E-mail：shuilinzh@sina.com。
