Impacts of ultrasound on leaching recovery of zinc from low grade zinc oxide ore

Green Processing and Synthesis

article

Shiwei Li¹  Weiheng Chen¹  Shaohua Yin¹  Aiyuan Ma¹  Kun Yang¹  Feng Xie¹  Libo Zhang¹  Jinhui Peng¹ 

[1] State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology;Yunnan Provincial Key Laboratory of Intensification Metallurgy;National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology;Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology

关键词: ammonia leaching;    low grade zinc oxide ore;    ultrasound;    zinc recovery;   

DOI  :  10.1515/gps-2015-0036

来源: De Gruyter

【 摘 要 】

On the basis of an experiment on ultrasonic enhanced ammonia leaching of low grade zinc oxide ores, the effects of the total ammonia concentration, the ratio between the NH 3 concentration ( C NH 3 ) and that of ammonium sulfate (NH 4 ) 2 SO 4 ( C (NH 4 ) 2 SO 4 ), and the ultrasound power on zinc leaching rate were studied. The results showed that the leaching efficiency of zinc observably increased with the increase of the total ammonia concentration, and that the ratios between C NH 3 and C (NH 4 ) 2 SO 4 can remarkably affect the zinc extraction from the low grade zinc oxide ores. When the ratio between C NH 3 and C (NH 4 ) 2 SO 4 is 2 to 1, the leaching rates of zinc are observably improved. The ultrasound can improve the leaching efficiency of zinc, and its effect was especially pronounced when the NH 3 concentrations were low. The higher ultrasound power cannot sensibly improve the leaching rate of zinc, but it can improve the leaching speed and shorten the leaching time. Under the optimized conditions - total ammonia concentration of 8 mol/l, ratio between C NH 3 and C (NH 4 ) 2 SO 4 of 2 to 1, and ultrasound power of 600 W – 83.33% of zinc is recovered.

【 授权许可】

CC BY