Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution

作     者：DU GaoXiang1,3, ZHENG ShuiLin2 & DING Hao1 1 School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China 2 School of Chemical and Environment Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China 3 Hebei Qinghe Refractory Group Co. Ltd., Xingtai 054804, China 

作者机构：School of Materials Science and Technology China University of Geosciences (Beijing) Beijing China Hebei Qinghe Refractory Group Co. Ltd. Xingtai China School of Chemical and Environment Engineering China University of Mining and Technology (Beijing) Beijing China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2009年第52卷第1期

页      面：204-209页

核心收录：

学科分类：081902[工学-矿物加工工程] 0819[工学-矿业工程] 08[工学] 

基　　金：Supported by the National Natural Science Foundation of China (Grant No.50674080) 

主　　题：asbestos tailing acid leaching residue sodium hydroxide process optimization 

摘      要：Silica is the major component of the acid leaching residue of asbestos tailing. The waterglass solution can be prepared by the reaction of the residue with sodium hydroxide aqueous solution. Compared to the high temperature reaction method, this process is environmental friendly and low cost. In this paper, the reaction process of the residue and the sodium hydroxide aqueous solution is optimized. The optimum reaction process parameters are as follows: the usage of sodium hydroxide is 26.4 g/100 g acid leaching residue, the reaction temperature is 90℃, the reaction time is 1 h, and the ratio of the liquid/solid is 2.0. The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium hydroxide the ratio of the liquid/solid the reaction time the reaction temperature. The significance sequence to the leaching ratio of SiO2 is the ratio of the liquid/solid the usage of sodium hydroxide the reaction time the reaction temperature. The significance sequence to the modulus of the sodium silicate is the ratio of the liquid/solid the usage of sodium hydroxide the reaction time the reaction temperature. Under the optimum conditions, the leaching ratio of the SiO2 is 77.5%, and the modulus of the sodium silicate is 3.15. The XRD analysis result indicates that the major components of the alkali leaching residue are serpentine, talc, quartz and some albite.