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Minerals 2016, 6(4), 119; doi:10.3390/min6040119

Iron Recovery from Discarded Copper Slag in a RHF Direct Reduction and Subsequent Grinding/Magnetic Separation Process

1
Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing Shenwu Environment & Energy Technology Corp., Beijing 102200, China
*
Author to whom correspondence should be addressed.
Academic Editor: Massimiliano Zanin
Received: 4 August 2016 / Revised: 16 October 2016 / Accepted: 20 October 2016 / Published: 3 November 2016
View Full-Text   |   Download PDF [4265 KB, uploaded 3 November 2016]   |  

Abstract

Studies on the direct reduction of carbon-bearing pellets made from discarded copper slag have been conducted in this paper. They include the influences of reduction coal content, limestone content, industrial sodium carbonate content, reduction temperature, reduction time and layers of carbon-bearing pellets on reduction effect. Finally, the optimum conditions have been obtained. The pilot scale experiment results show that the optimum conditions are the mass proportion of discarded copper slag, reduction coal, limestone and industrial sodium carbonate of 100:25:10:3, the reduction temperature of 1280 °C for the reduction time of 35 min, three layers (approximately 42 mm) of carbon-bearing pellets—this was the basis on which the pilot tests in a rotary hearth furnace (RHF) were conducted. The iron products obtained from the pilot tests under such conditions have an iron grade of 90.35% with an iron recovery rate of 89.70%. The mechanism research based on the analysis results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) indicates that fayalite (2FeO·SiO2) and magnetite (Fe3O4) in the copper slag are reduced into metallic Fe in the direct reduction (DR) process, and the mass and heat transfer become stronger from the bottom to the top layer of the pellets, resulting in a rising iron recovery rate. View Full-Text
Keywords: rotary hearth furnace; discarded copper slag; layers of carbon-bearing pellets; direct reduction rotary hearth furnace; discarded copper slag; layers of carbon-bearing pellets; direct reduction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Cao, Z.; Sun, T.; Xue, X.; Liu, Z. Iron Recovery from Discarded Copper Slag in a RHF Direct Reduction and Subsequent Grinding/Magnetic Separation Process. Minerals 2016, 6, 119.

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