Reaction mechanism of molten Na OH decomposing Zn_2SiO_4 in willemite  

作　　者：赵昌明 翟玉春 张崇民 李军丽 李胜利 

机构地区：[1]School of Materials and Metallurgy, University of Science and Technology Liaoning [2]School of Materials and Metallurgy, Northeastern University

出　　处：《Journal of Central South University》2015年第4期1227-1231,共5页中南大学学报（英文版）

基　　金：Project(2007CB613603)supported by the National Basic Research Program of China;Project(51204037)supported by the National Natural Science Foundation of China

摘　　要：Based on the existing form of Zn2 Si O4 in willemite, the chemical precipitation method was used to synthesize Zn2 Si O4.Through the orthogonal experimentation, the reaction conditions of melten Na OH decomposing Zn2 Si O4 were optimized, and the optimal experimental conditions include reaction temperature of 400 °C, reaction time of 4 h, and alkaline-to-ore molar ratio of 20:1.Based on the optimized experiment, on-line detection for the alkali leaching was made by using Raman spectroscopy; XRD was used to analyze the structure of water leaching residue, to explore the reaction mechanism of Na OH decomposing Zn2 Si O4. The results show that during the reaction process, the Si — O bond in Si O4 is destroyed, and the Na OH inserts itself into the silicate lattice,producing an immediate Na2 Zn Si O4 product. After the alkali leaching process, Zn2+ can be separated from the Si O4 array, which can be released out of the silicate in the form of ZnO.Based on the existing form of Zn2 Si O4 in willemite, the chemical precipitation method was used to synthesize Zn2 Si O4.Through the orthogonal experimentation, the reaction conditions of melten Na OH decomposing Zn2 Si O4 were optimized, and the optimal experimental conditions include reaction temperature of 400 °C, reaction time of 4 h, and alkaline-to-ore molar ratio of 20：1.Based on the optimized experiment, on-line detection for the alkali leaching was made by using Raman spectroscopy; XRD was used to analyze the structure of water leaching residue, to explore the reaction mechanism of Na OH decomposing Zn2 Si O4. The results show that during the reaction process, the Si — O bond in Si O4 is destroyed, and the Na OH inserts itself into the silicate lattice,producing an immediate Na2 Zn Si O4 product. After the alkali leaching process, Zn2＋ can be separated from the Si O4 array, which can be released out of the silicate in the form of ZnO.

关 键 词：Raman spectroscopy Zn2SiO4 alkali melting reaction mechanism 

分 类 号：TD982[矿业工程—选矿] O643.12[理学—物理化学]