Hydrometallurgical Process for Zinc Recovery from CZO Generated by the Steelmaking Industry with Ammonia-Ammonium Chloride Solution

被引：17

作者：

Yang, Shenghai ^{[1
]}

Zhao, Duoqiang ^{[1
]}

Jie, Yafei ^{[1
]}

Tang, Chaobo ^{[1
]}

He, Jing ^{[1
]}

Chen, Yongming ^{[1
]}

机构：

[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

来源：

METALS | 2019年 / 9卷 / 01期

关键词：

crude zinc oxide; steel dust; ammonia-ammonium chloride; zinc; secondary resource; EXTRACTION; REMOVAL;

D O I：

10.3390/met9010083

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this research, some experimental steps were investigated to recover zinc contained in crude zinc oxide (C.Z.O.). In the first stage, the C.Z.O. was treated in NH3-NH4Cl-H2O solution to dissolve the metals. The optimized leaching conditions in batch experiments were obtained: agitation speed 250 rpm, concentration of ammonia and ammonium chloride 2.5 mol/L and 5 mol/L, respectively, time 30min, temperature 40 degrees C, and L/S = 6 mL/g. The extraction percentage of zinc was over 81% under the optimized leaching conditions. The kinetic study indicates that zinc extraction from the C.Z.O particles was very rapid. In the second stage, the solution from the leaching process was purified by adding zinc dust to the solution. The Cu, Cd, Pb, Sb, and As could be reduced to levels of 0.03, 0.09, 0.87, 0.22, and 0.12 mg/L after the purification process. Finally, the electrowinning process was used to recover dissolved Zn from the final solution. The zinc content in the electrowon zinc was more than 99.99%.

引用

页数：11