High-temperature thermodynamics of ZnO–NH4Cl–H2O system

Journal of Materials Research and Technology

卷:9

Yafei Jie¹  Yongming Chen²  Shenghai Yang³  Duoqiang Zhao³  Jing He³  Chaobo Tang³ 

[1] School of Metallurgy and Environment, Central South University, National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, 410083, China;

[2] Corresponding author.;

关键词: Zinc hydrometallurgy;    Ammonium chloride;    High-temperature thermodynamics;    Ion entropy;   

DOI  :  

来源: DOAJ

【 摘 要 】

On the basis of the principles of simultaneous equilibrium, conservation of mass, and aqueous electronic charge neutrality and the correspondence principle of ion entropy, the high-temperature thermodynamics of the ZnO–NH4Cl–H2O system was studied to predict solubility and construct Zn species distribution. The model was constructed precisely by using the MATLAB program. The total Zn2+ concentration in the solution was affected significantly by temperature and total ammonium concentration. ZnNH3Cl3− was the predominant species in the ZnO–NH4Cl–H2O system. The solubility of zinc diammine chloride in NH4Cl solution (>2 mol·L−1) in the temperature range of 303–353 K was determined using equilibrium experiments, which had results that agreed well with the theoretical value. The data and high-temperature thermodynamic model used in this paper are reliable.

【 授权许可】

Unknown