Preparation of metallic iron powder from copper slag by carbothermic reduction and magnetic separation. (2nd July 2016)

• Record Type: Journal Article
• Authors: Long, H.; Meng, Q.; Chun, T.; Wang, P.; Li, J.
• Is Part Of: Canadian metallurgical quarterly. Volume 55:Number 3(2016:Jul.)
• Page Start: 338
• Page End: 344
• Publication Date: 2016-07-02
• Subjects: Copper slag -- Carbothermic reduction -- Magnetic separation -- Metallic iron powder; Metallurgy -- Periodicals; 669.05
• DOI: 10.1080/00084433.2016.1181313
• Languages: English
• ISSNs: 0008-4433

Abstract

Abstract : Copper slag is a solid waste that has to be treated for metals recovery. In order to recover iron from copper slag, the technology of carbothermic reduction and magnetic separation was developed. During the reduction roasting, additive CaO reacted with Fe2 SiO4 of copper slag, forming CaO·SiO2 and 2CaO·SiO2, which ameliorates the separation between iron and other minerals during magnetic separation. Meanwhile, additive CaF2 improved the growth of iron grains, increasing the iron grade and iron recovery. The metallic iron powder obtained contained 90.95 wt-% TFe at 91.87 wt-% iron recovery under the optimum conditions, which can be briquetted as a burden material for steel making by electric arc furnace to replace part of scrap.