Development of Kinetic Model for Reactions Between Cu-Containing Multicomponent Slag and Liquid Sulfide Using Coupled Re
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IN the copper smelting process, approximately 2 tons of slag are generated as byproduct for every ton of pure copper produced. Copper smelting slag contains less than 2 mass pct of Cu oxide and 30–40 mass pct or more of FexO.[1] Approximately 24.6 million tons of slag are generated globally: approximately 4 million tons in the US, 2 million tons in Japan, and 1.5 million tons in Korea.[2,3] Slag contains more than 40 mass pct of Fe, but since the technology to remove Cu from slag has not been established, more than 500,000 tons of iron resources are left in Korea annually. The amount of slag generated also increases annually because of the lack of copper ore with high Cu content.[4] Part of the copper smelting slag is used as raw material for cement and sand blasting material, but it is mainly used for civil engineering materials or landfills.[5] In any field, the inherent value of the elements contained in slag is perceived as low and are not utilized effectively.
SEUNG-HWAN SHIN is with the Department of Advanced Materials Engineering, Chosun University, 309 Pilmun-daero, Donggu, Gwangju 61452 Korea. SUN-JOONG KIM is with the Department of Materials Science and Engineering, Chosun University. Contact e-mail: [email protected] Manuscript submitted February 20, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS B
Copper smelting slag contains a large amount of fayalite (Fe2SiO4); hence, magnetic separation in iron recovery is limited.[6] It is possible to reduce FexO to Fe through the reduction process using carbon of copper smelting slag, but Cu oxide is also reduced, and Fe contains approximately 1 mass pct of Cu.[7] In steel products, Cu is a harmful element that deteriorates hot workability; Cu is also difficult to remove in the steel smelting process. Therefore, there is a problem inherent with using copper smelting slag as a steel resource for steel production using a simple carbon reduction method. In order to remove Cu from the slag containing Cu2O, Zhang et al. proposed a sulfurization process using FeS (matte) as a sulfur source.[5] Furthermore, Cohen and Blander investigated the behavior of copper in scrap iron and steel using FeS to remove Cu.[8] FeS-based matte can be introduced for sulfurization to concentrate Cu in the slag to the sulfide and finally recover the copper resources. In the case of iron in the slag with low Cu via sulfurization, it can be recovered as iron resources for steel production. In the present study, we propose a coupled reaction model to simulate the reaction between Cu-containing multicomponent slag and FeS-based matte. Previously, the simulation model of the reaction between Mn-containing multicomponent slag and FeS-based matte was developed to recover Mn from the steelmaking slag using thermodynamic data and double-film theory.[9] In the proposed model, the activity coefficient of the oxides
in the multicomponent slag was calculated using regular solution[10] and interaction parameters.[9] The activity coefficients of Cu2O, which was less than 1 mass pct in the slag, and the activi
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