Volume 1, Number 1 (2016)
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Home > Journals > SCIREA Journal of Metallurgical Engineering > Archive > Paper Information

Sulfuric acid leaching of sulfide slag of Sarcheshmeh copper reverberatory furnace

Volume 1, Issue 1, October 2016    |    PP. 12-27    |PDF (630 K)|    Pub. Date: October 29, 2016
239 Downloads     1421 Views  

Author(s)
Hossein Aghajani, Materials Engineering Department, University of Tabriz, Tabriz, Iran.
Jalil Vahdati Khaki, Department of Metallurgy and Materials Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
Masoud Goudarzi, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran.
Naser Hosseini, Materials Engineering Department, University of Tabriz, Tabriz, Iran.

Abstract
Reverberatory furnace slag is a material that is created from metal smelting processes and it is usually assumed as a waste material in these processes. In this research, hydrometallurgical extraction of copper from Sarcheshmeh reverberatory furnace slag has been investigated. Firstly, studies were carried out to determine the chemical composition of the slag by X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) analysis. Slag was crushed and sieved by different meshes. Then, sulfuric acid leaching was performed on the slag with +60, +80, +100, +120 and -120 mesh numbers at 27, 40, 65, 80 and 100℃ leaching temperatures, respectively. Leaching solvent concentrations was set as 1.02, 2.04, 3.06, 4.08 and 5.1 mole.liter-1 for 15, 30, 45, 60, 90, 105and 120 minute leaching time and 100, 200, 300 and 400 rpm stirring speed. In order to determine the copper percentage in the leaching solution, Atomic Absorption Spectroscopy (AAS) has been utilized. Also, the leaching mechanism was studied utilizing different kinetic models. Finally, In order to increase the efficiency of the leaching process, the effect of mechanically activation, Ag+ addition (as a catalyst ion) and a roasting process before leaching have been studied. Results showed that the best efficiency was coordinated with -120 mesh particle size, 4.08 mole/liter acid concentration, 80℃, 100 rpm stirring speed. Also, mechanism studies show that the chemical reaction at the interface was the controlling factor and the activation energy for the dissolution reaction was 4.95 kj/mol.

Keywords
hydrometallurgy; sulfuric acid; reverberatory slag; leaching; kinetics.

Cite this paper
Hossein Aghajani, Jalil Vahdati Khaki, Masoud Goudarzi, Naser Hosseini, Sulfuric acid leaching of sulfide slag of Sarcheshmeh copper reverberatory furnace, SCIREA Journal of Metallurgical Engineering. Vol. 1 , No. 1 , 2016 , pp. 12 - 27 .

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