کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4769291 | 1425533 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A novel approach of preparing ZnO from ammoniacal leaching solution with high chlorine levels based on thermodynamic analysis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Thermodynamic calculations for Zn(II)âNH3 â ClââH2O system have been presented based on free energy minimization algorithms and simultaneous equilibrium principle. Independent predominance diagrams was constructed as a function of Zn(II), NH3, Clâ concentrations versus pH, which indicates that Zn(NH3)2Cl2(s) is the most likely solid phase in near-neutral zinc solutions with high ammonia and chlorine levels. The precipitation trend of Zn(NH3)2Cl2(s) derived from experiments were consistent with the prediction by theoretical calculation. Pure ZnO(s) was successfully synthesized by a two-step hydrolysis approach, in which Zn(OH)1.6Cl0.4(s) was firstly produced from the hydrolytic deamination of Zn(NH3)2Cl2(s) and ZnO(s) was then obtained by the further hydrolytic dechlorination of Zn(OH)1.6Cl0.4(s). Both temperature and water amount played an important role on the hydrolysis procedure. Zn(NH3)2Cl2(s) can be transformed to Zn(OH)1.6Cl0.4(s) completely at room temperature with liquid-solid ratio higher than 9:1, and Zn(OH)1.6Cl0.4(s) can be thoroughly converted to ZnO(s) at 80 °C with liquid-solid ratio of 5:1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 171, August 2017, Pages 306-311
Journal: Hydrometallurgy - Volume 171, August 2017, Pages 306-311
نویسندگان
Huazhen Cao, Zefeng Zhang, Liankui Wu, Guoqu Zheng,