摘要
考察了Ｚｎ（Ⅱ）ＮＨ３ＮＨ４ＣｌＨ２Ｏ体系电积锌过程中温度、电流密度、锌浓度对槽电压和电流效率的影响．发现电流密度和温度对槽电压影响显著．用正交试验确定最佳工艺参数为：温度５０℃，电流密度４００Ａ·ｍ－２．在保证电流效率大于９０％的前提下，电解母液中锌浓度可降到１０ｇ·Ｌ－１以下．电能消耗２４６０ｋＷ·ｈ·ｔ－１锌，氨耗０．２５４ｔ·ｔ－１锌．另外，查明了阳极反应为析氮反应，而不是析氧反应．开发Ｚｎ（Ⅱ）ＮＨ３ＮＨ４ＣｌＨ２Ｏ体系电积锌的新工艺对铸锌渣。
In this paper the effects of temperature ,zinc concentration and current density on the current efficiency and the electrolyzer voltage have been examined in the process of electrowinning zinc . It is found that there are not radical effects of other factors on it except radical effectes of temperature and current density on the electrolyzer voltage . So the best process paraments, i. e. temperature 50 ℃, current density 400 A·m -2 , have been chosen . To ensure the current efficiency is above 90%, the minium zinc concentration in the electrowinned liquid can be lower than 10 g·L -1 .Under the best conditions ,the current effieciency is about 95% and the consumption of electric energy and ammonia is about 2460 k·W·h·t -1 and 0.254 t·t -1 respectively . In addition , the mechanism of anodic reaction in the process of electrowinning zinc has been exposed, in which the anodic reaction is not to produce oxygen ,but to escape nitrogen. The development of the new process of electrowinning zinc in the system of Zn(Ⅱ) NH 3 NH 4Cl H 2O is of great significance to the utilization of zinc materials bearing high Cl or Fe such as the casting zinc slags ,the removed iron residues in the zinc hydrometallurgy and zinc oxide ores.
出处
《中南工业大学学报》
CSCD
北大核心
1999年第2期153-156,共4页
Journal of Central South University of Technology(Natural Science)
