Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate

›› 2010, Vol. 18 ›› Issue (6): 948-953.

Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate

薛娟琴, 卢曦, 杜业威, 毛维博, 王玉洁, 李京仙

School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

收稿日期:2010-03-22 修回日期:2010-07-16 出版日期:2010-12-28 发布日期:2010-12-28
通讯作者: XUE Juanqin, E-mail: huagong1985@163.com
基金资助:
Supported by the National Natural Science Foundation of China (50874087,50978212);the Key Projects in the National Science and Technology Pillar Program (2009BAA20B02)

Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate

XUE Juanqin, LU Xi, DU Yewei, MAO Weibo, WANG Yujie, LI Jingxian

School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

Received:2010-03-22 Revised:2010-07-16 Online:2010-12-28 Published:2010-12-28
Supported by:
Supported by the National Natural Science Foundation of China (50874087,50978212);the Key Projects in the National Science and Technology Pillar Program (2009BAA20B02)

摘要/Abstract

摘要： The feasibility of oxidation leaching process of nickel from nickel sulfide ore and the form of different components in the lixivium has been studied at first. The method of leaching nickel sulfide concentration directly by oxidants with existence of ultrasonic has been advanced. The process of leaching nickel from nickel sulfide concentration by using the system of persulfate and silver has been determined. The influence of different factors on the leaching rates of nickel,such as with and without ultrasonic,the concentration of Na₂S₂O₈,liquid-solid ratio and the concentration of AgNO₃ have been explored. The results show that:(1) in the oxidative leaching system,nickel can be leached completely as Ni²⁺ or NiSO₄(aq.) from nickel sulfide concentration in theory;(2) the nicopyrite can not exist steadily in the persulfate acid leaching system,but Ni2+can. Meanwhile,sulfur may be existed steadily in the leaching process;(3) nicopyrite with much lower electrostatic potential may be leached earlier than chalcopyrite and sideropyrite;and(4) the overall reaction rate of the leaching process can be enhanced with ultrasonic radiation,but it does not change the mechanism of leaching. The more oxidant concentration or higher liquid-solid ratio is,the higher leaching percentage of nickel. The leaching percentage of nickel can be increased significantly by adding a small amount of AgNO₃ during the leaching processes. Under the same conditions,the higher concentration of AgNO₃ is,the higher leaching yields of nickel will be obtained.

关键词: nickel sulfide concentration, potential-pH diagram, direct oxidation, leaching, ultrasonic

Abstract: The feasibility of oxidation leaching process of nickel from nickel sulfide ore and the form of different components in the lixivium has been studied at first. The method of leaching nickel sulfide concentration directly by oxidants with existence of ultrasonic has been advanced. The process of leaching nickel from nickel sulfide concentration by using the system of persulfate and silver has been determined. The influence of different factors on the leaching rates of nickel,such as with and without ultrasonic,the concentration of Na₂S₂O₈,liquid-solid ratio and the concentration of AgNO₃ have been explored. The results show that:(1) in the oxidative leaching system,nickel can be leached completely as Ni²⁺ or NiSO₄(aq.) from nickel sulfide concentration in theory;(2) the nicopyrite can not exist steadily in the persulfate acid leaching system,but Ni2+can. Meanwhile,sulfur may be existed steadily in the leaching process;(3) nicopyrite with much lower electrostatic potential may be leached earlier than chalcopyrite and sideropyrite;and(4) the overall reaction rate of the leaching process can be enhanced with ultrasonic radiation,but it does not change the mechanism of leaching. The more oxidant concentration or higher liquid-solid ratio is,the higher leaching percentage of nickel. The leaching percentage of nickel can be increased significantly by adding a small amount of AgNO₃ during the leaching processes. Under the same conditions,the higher concentration of AgNO₃ is,the higher leaching yields of nickel will be obtained.

Key words: nickel sulfide concentration, potential-pH diagram, direct oxidation, leaching, ultrasonic

薛娟琴, 卢曦, 杜业威, 毛维博, 王玉洁, 李京仙. Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate[J]. , 2010, 18(6): 948-953.

XUE Juanqin, LU Xi, DU Yewei, MAO Weibo, WANG Yujie, LI Jingxian. Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate[J]. , 2010, 18(6): 948-953.

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Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate

Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate

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