Solubility of hemimorphite in ammonium sulfate solution at 25 °C  

25°C时异极矿在硫酸铵溶液中的溶解度(英文)

作　　者：李琴香[1] 胡慧萍[1] 曾德文[1] 陈启元[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第7期2160-2165,共6页中国有色金属学报（英文版）

基　　金：Foundation item:Project(2007CB613601)supported by the National Basic Research and Development Program of China;Project(511340071)supported by the National Natural Science Foundation of China

摘　　要：The solubility of natural hemimorphite in ammonium sulfate solution was measured by isothermal solution method at 25 °C and the dissolved residue of hemimorphite was investigated by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM） and Fourier transform infrared spectroscopy （FTIR） methods. The results show that zinc and silica in hemimorphite simultaneously dissolve in ammonium sulfate solution. The solubility of zinc in solution increases rapidly from 4.5381 mmol/kg in 0.5469 mol/kg ammonium sulfate solution to 11.5083 mmol/kg in 3.7038 mol/kg ammonium sulfate solution. The solubility of silica in solution increases slowly from 2.5509 mmol/kg in 0.5469 mol/kg ammonium sulfate solution to 7.2891 mmol/kg in 3.7038 mol/kg ammonium sulfate solution. The dissolved residue is the characteristic of hemimorphite Zn4Si2O7（OH）2·H2O based on the results of the XRD, SEM and FTIR. Thus, no phase transition occurs in the dissolution process of hemimorphite in ammonium sulfate solution.采用等温法测定了25°C时异极矿在硫酸铵溶液中的溶解度,并利用X射线衍射、傅里叶转换红外光谱及扫描电子显微镜分析了溶解湿渣的性质。结果表明:异极矿中的锌、硅同时溶解在硫酸铵溶液中且随着硫酸铵浓度的增加,溶液中锌的浓度从4.5381mmol/kg迅速增加到11.5083mmol/kg,硅的浓度从2.5509mmol/kg缓慢增加到7.2891mmol/kg。结合X射线衍射、傅里叶转换红外光谱以及扫描电子显微镜的结果,证实了在溶解过程中无相变发生,湿渣的组成仍为异极矿。

关 键 词：HEMIMORPHITE ammonium sulfate silicic acid SOLUBILITY 

分 类 号：TF111.31[冶金工程—冶金物理化学]