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Chemical and Mineralogical Analysis of Reformed Slag during Iron Recovery from Copper Slag in the Reduction Smelting

Urtnasan Erdenebold Jei-Pil Wang Wang

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 809-818 | DOI: 10.24425/amm.2021.136385

Keywords Copper slag fayalite pig iron reformed slag

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Abstract

Copper slag is usually a mixture of iron oxide and silicon dioxide, which exist in the form of fayalite (2FeO·SiO2), and contains ceramic components as the SiO2, Al2O3 and CaO depending on the initial ore quality and the furnace type. Our present study was focused on manufacture of foundry pig iron with Cu content from copper slag using high-temperature reduction smelting and investigate utilization of by-products as a reformed slag, which is giving additional value to the recycling in a replacement of raw material of Portland cement. Changes of the chemical and mineralogical composition of the reformed slag are highly dependent on the CaO concentration in the slag. The chemical and mineralogical properties and microstructural analysis of the reformed slag samples were determined through X-ray Fluorescence spectroscopy, X-Ray diffractometer and Scanning Electron Microscopy connected to the dispersive spectrometer studies.

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Authors and Affiliations

Urtnasan Erdenebold

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ORCID:

Jei-Pil Wang Wang

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ORCID:

Pukyong National University, Department of Metallurgical Engineering, Busan, Republic of Korea

Recovery of Pig Iron from Copper Smelting Slag by Reduction Smelting

U. Erdenebold H.-M. Choi J.-P. Wang

Archives of Metallurgy and Materials | 2018 | vol. 63 | No 4 | 1793-1798 | DOI: 10.24425/amm.2018.125106

Keywords copper slag reduction pig iron fayalite recovery

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Abstract

Copper slag is a by-product obtained during smelting and refining of copper. Copper smelting slag typically contains about 1 wt.% copper and 40 wt.% iron depending upon the initial ore quality and the furnace type. Main components of copper slag are iron oxide and silica. These exist in copper slag mainly in the form of fayalite (2FeO ·SiO2). This study was intended to recover pig iron from the copper smelting slag by reduction smelting method. At the reaction temperature of below 1400°С the whole copper smelting slag was not smelted, and some agglomerated, showing a mass in a sponge form. The recovery behavior of pig iron from copper smelting slag increases with increasing smelting temperature and duration. The recovery rate of pig iron varied greatly depending on the reaction temperature.

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Authors and Affiliations

U. Erdenebold

H.-M. Choi

J.-P. Wang