Phase Equilibria Study of Tin-containing Slag

Xiaoyong Xu (2011). Phase Equilibria Study of Tin-containing Slag MPhil Thesis, School of Chemical Engineering, The University of Queensland.

       
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Author Xiaoyong Xu
Thesis Title Phase Equilibria Study of Tin-containing Slag
School, Centre or Institute School of Chemical Engineering
Institution The University of Queensland
Publication date 2011-06
Thesis type MPhil Thesis
Supervisor Peter Hayes
Evgueni Jak
Total pages 154
Total colour pages none
Total black and white pages 154
Subjects 09 Engineering
Abstract/Summary With the continuously increasing amount of E-waste scrap generated in the world and the use of lead-free solder materials, it is becoming a critical issue to develop a suitable process for the recovery of precious metals (Cu, Sn and Ag, Au, PGM’s) from the secondary sources. The chemistry of primary tin smelting is principally described by the seven component system SnO-SnO2-FeO-Fe2O3-CaO-Al2O3-SiO2, which represents the logical starting point for the development of tin smelting for E-waste. A critical review of the scientific literature available on the experimental phase equilibria of the tin-containing systems has shown that the phase equilibria in these systems are not well defined. In particular further experimental data are required to fully characterise this system at tin-iron alloy saturation and at fixed oxygen partial pressures. The high vapour pressures of tin species under tin smelting conditions necessitate the use of improved experimental methodologies to determine the phase equilibria in tin-containing systems. In the present study, the primary phase substrate support techniques combined with the use of the electron X-ray microprobe analysis have been used, and phase equilibrium investigations and liquidus determinations have been carried out on the following systems (the notation “SnO” and “FeO” are used here to indicate that tin and iron species are present in these systems in more than one oxidation state): 1) “SnO”-Sn 2) “SnO2”-CaO-SiO2 in air 3) “SnO”-SiO2 in equilibrium with tin metal 4) “SnO”-CaO-SiO2 in equilibrium with tin metal 5) “SnO”-“FeO” in equilibrium with Sn-Fe alloy 6) “SnO”-SiO2-“FeO” in equilibrium with Sn-Fe alloy 7) “SnO”-SiO2-“FeO” in equilibrium with Sn-Fe alloy, tridymite and at fixed oxygen partial pressures at 1473 K The experimental data obtained in the present study have been presented in the form of the new phase diagrams in the tin-containing systems and provide the basis for the development of slag system for the treatment of E-waste. These fundamental data also provide experimental information that can be used in the determination of thermodynamic databases with which to characterise phase relations over a wide range of compositions important to recover the electronic waste and the industrial tin smelting processes.
Keyword E-waste
tin smelting
phase equilibria
liquidus

 
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Created: Mon, 17 Oct 2011, 09:08:45 EST by Mr Xiaoyong Xu on behalf of Library - Information Access Service