Materials Reports  2019, Vol. 33 Issue (Z2): 505-511 |
| METALS AND METAL MATRIX COMPOSITES |
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| The Dilution Effect and Slag Shape Structure of Copper Slag Optimized by Melting Step Reduction Method |
| SUN Xuewei1, WANG Yang1,2, HU Jianhang1,2
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1 Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology, Kunming 650093;
2 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093 |
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Abstract The thermodynamics and experimental process of reduction of molten copper slag at high temperature were studied according to the phase composition of copper slag and the process characteristics of molten pool melting. The traditional one-step reduction metal recovery method of copper slag often produces a large number of metal alloys in the products, which reduces the metal recovery rate. In order to avoid improper control of reduction degree to generate metal alloy, this experiment adopted steps reduction method to recover valuable metal copper and iron in copper slag respectively, and analyzed the influence of melting pool temperature, the addition amount of flux CaO and reducing agent carbon powder on the dilution effect of slag, and mastered the transformation of slag type during reduction and dilution process. The results showed that the reduction rate of Cu2O in slag reached 95.36% for the temperature 1 350 ℃, the settling time 40 min, the CaO control amount in slag 22% and the reducing agent charcoal powder 2.29%. When the amount of reducing agent charcoal powder was controlled at 8%, the iron phase deposition rate and metallization rate reached 83.13% and 85.30% respectively. At this time, due to proper control of the dilution conditions, reduction and precipitation of the mixture of copper and iron metals are avoided. The deep dilution of copper and iron phase in slag is realized, and the effect of copper slag dilution is promoted. In addition, in the process of the reduction and dilution, because of the flux CaO and reducing agent carbon powder added, iron oxide in the copper slag were controlled to be gradually reduced, and the slag type was transformed from SiO2-Fe3O4-FeO high viscosity slag system with complex structure to SiO2-Al2O3-CaO ternary slag system with the low viscosity and low melting point. The slag type of the system has been effectively optimized, and it provides a stable slag type for the subsequent resource utilization of copper slag.
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Published: 25 November 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51376085), the National Natural Science Foundation Youth Fund of China (U1602272). |
About author:: Xuewei Sun received her M.S. degree in June 2019 from Kunming University of Science and Technology, focusing on the research of the secondary resources recycling and reuse.
Jianhang Hu, professor. He is the faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology. In December 2007, he received his PhD in metallurgical energy engineering from Kunming University of Science and Technology and was a visiting scholar at the University of Sydney, Australia. In 2011, he was selected as a reserve talent of young and middle-aged academic and technical leaders in Yunnan province. He has won 7 provincial and ministe-rial awards, including the first prize of China Nonferrous Metal Industry Science and Technology Award and the first prize of Provincial Science and Technology award. He has been engaged in the scientific research on the basic theory of technology and applied key technologies in the fields of high-value energy conversion and new energy development. He has published more than 50 papers, 20 papers included by EI and SCI, 4 academic monographs, and more than 40 national patents. |
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