Study of decomposing carbonyl slag

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. 2; pp. 477 - 482
• Main Author: 陈爱良 孙培梅 赵中伟 李洪桂 陈星宇
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2006; School of Metallurgical Science and Engineering, Central South University, Changsha 410083,China%School of Chemical Engineering and Technology, China University of Mining and Technology, Beijing 100083, China
• Subjects: carbonyl slag; cobalt; copper; leaching rates; low oxygen pressure leaching; nickel; reclaiming efficiency; 有色金属; 综合利用; 羰基矿渣; nickel; reclaiming efficiency; low oxygen pressure leaching; leaching rates; copper; cobalt; carbonyl slag
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(06)60082-4

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 rain; 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.