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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 2    April 2006

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Study of decomposing carbonyl slag
CHEN Ai-liang(陈爱良)1, SUN Pei-mei(孙培梅)2, ZHAO Zhong-wei(赵中伟)1,
LI Hong-gui(李洪桂)1, CHEN Xing-yu(陈星宇)1

1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Chemical Engineering and Technology, China University of Mining and Technology,Beijing 100083, China

Abstract:A new technology was put forward to deal with the carbonyl slag at low acidity and low oxygen pressure in the kettle. With the orthogonal experiments for analyzing the sequence of four factors and some single factor experiments for the best conditions. The best conditions are used for extracting nickel, cobalt and copper and enriching precious metals: the cupric ion concentration is 5 g/L; and pH=6; the sulfur coefficient is 1.4; the oxygen pressure is 0.08 MPa; the time bubbling oxygen is 20 min; the ratio of liquid to solid is 8:1; the leaching time is 2 h; the heating time is 2.5 h. The leaching rates of nickel and cobalt are more than 98% and that of copper is above 97%. Nickel and cobalt can be separated efficiently from copper and precious metals from the carbonyl slag. Moreover, its leaching liquor has less copper. Nickel and cobalt can be reclaimed only once. During the whole process, the leaching rates of Au and Ag are more than 99.9%, while other precious metals are still in the residue without any loss.

 

Key words: carbonyl slag; nickel; cobalt; copper; low oxygen pressure leaching; reclaiming efficiency; leaching rates

ISSN 1672-7029
CN 43-1423/U

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