The viscous behavior of FeOt-Al2O3- SiO2 copper smelting slags

Hyun Shik Park; Su Sang Park; Il Sohn

doi:10.1007/s11663-011-9512-7

The viscous behavior of FeO_t-Al₂O₃- SiO₂ copper smelting slags

Hyun Shik Park, Su Sang Park, Il Sohn

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

Understanding the viscous behavior of copper smelting slags is essential in increasing the process efficiency and obtaining the discrete separation between the matte and the slag. The viscosity of the FeO_t-SiO ₂-Al₂O₃ copper smelting slags was measured in the current study using the rotating spindle method. The viscosity at a fixed Al₂O₃ concentration decreased with increasing Fe/SiO ₂ ratio because of the depolymerization of the molten slag by the networkmodifying free oxygen ions (O_2-) supplied by FeO. The Fourier transform infrared (FTIR) analyses of the slag samples with increasing Fe/SiO₂ ratio revealed that the amount of large silicate sheets decreased, whereas the amount of simpler silicate structures increased. Al ₂O₃ additions to the ternary FeO_t-SiO ₂-Al₂O₃ slag system at a fixed Fe/SiO ₂ ratio showed a characteristic V-shaped pattern, where initial additions decreased the viscosity, reached a minimum, and increased subsequently with higher Al₂O₃ content. The effect of Al ₂O₃ was considered to be related to the amphoteric behavior of Al₂O₃, where Al₂O₃ initially behaves as a basic oxide and changes to an acidic oxide with variation in slag composition. Furthermore, Al₂O₃ additions also resulted in the high temperature phase change between fayalite/hercynite and the modification of the liquidus temperature with Al₂O₃ additions affecting the viscosity of the copper smelting slag.

Original language	English
Pages (from-to)	692-699
Number of pages	8
Journal	Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume	42
Issue number	4
DOIs	https://doi.org/10.1007/s11663-011-9512-7
Publication status	Published - 2011 Aug

Bibliographical note

Funding Information:
This study was supported partially by the Brain Korea 21 (BK21) Project at the Division of the Humantronics Information Materials, LS-Nikko Copper Inc., the National Science Foundation of Korea Project No.2010-8-0581, and the Ministry of Knowledge Education Project No.2010-8-0972. Special appreciation is given to Professor D.J. Min for his continued support and helpful comments.

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/s11663-011-9512-7

Cite this

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title = "The viscous behavior of FeOt-Al2O3- SiO2 copper smelting slags",

abstract = "Understanding the viscous behavior of copper smelting slags is essential in increasing the process efficiency and obtaining the discrete separation between the matte and the slag. The viscosity of the FeOt-SiO 2-Al2O3 copper smelting slags was measured in the current study using the rotating spindle method. The viscosity at a fixed Al2O3 concentration decreased with increasing Fe/SiO 2 ratio because of the depolymerization of the molten slag by the networkmodifying free oxygen ions (O2-) supplied by FeO. The Fourier transform infrared (FTIR) analyses of the slag samples with increasing Fe/SiO2 ratio revealed that the amount of large silicate sheets decreased, whereas the amount of simpler silicate structures increased. Al 2O3 additions to the ternary FeOt-SiO 2-Al2O3 slag system at a fixed Fe/SiO 2 ratio showed a characteristic V-shaped pattern, where initial additions decreased the viscosity, reached a minimum, and increased subsequently with higher Al2O3 content. The effect of Al 2O3 was considered to be related to the amphoteric behavior of Al2O3, where Al2O3 initially behaves as a basic oxide and changes to an acidic oxide with variation in slag composition. Furthermore, Al2O3 additions also resulted in the high temperature phase change between fayalite/hercynite and the modification of the liquidus temperature with Al2O3 additions affecting the viscosity of the copper smelting slag.",

author = "Park, {Hyun Shik} and Park, {Su Sang} and Il Sohn",

note = "Funding Information: This study was supported partially by the Brain Korea 21 (BK21) Project at the Division of the Humantronics Information Materials, LS-Nikko Copper Inc., the National Science Foundation of Korea Project No.2010-8-0581, and the Ministry of Knowledge Education Project No.2010-8-0972. Special appreciation is given to Professor D.J. Min for his continued support and helpful comments.",

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