Doctoral Dissertations
Alternative Title
Phase equilibria and thermodynamic modelling of the lead-sulfur-oxygen system and applications to direct lead smelting
Abstract
"Bullion-slag-S02(or 02)/N2 reaction systems in the Pb-S-0 system were investigated using the submerged injection technique at different temperatures. A thermochemical model was established for the Pb-S-0 system with experimental results and other thermodynamic data. The model was developed with the aid of a computer program called STEPSOL, which can simulate either a steady-state or stepwise bath-smelting reactor. The thermochemical model comprises ΔG°1 for all species present in the reaction system, a bullion model:
lnγS = -11000/T + 6.020 + (420/T - 1 .452) XS + ( 117 /T - 3.207)(XS)2
lnγPb = (-1173/T + 0.618)(XS)2
and a slag model:
γPbS04 = -4900/T + (10207/T) XPbS04 - (8403/T)(XPbS04)2
lnγPbO = (-4822/T)(XPbS04)2
It was found that pure PbS could be converted to very low sulfur bullion without oxidizing metallic lead into slag, using a unique controlled-oxidation process. This finding led to the proposition of a novel degangue-matte oxidation process for the production of metallic lead from a clean Missouri concentrate. The process is based on new process chemistry and has the potential of producing very low sulfur bullion and discard slag. Several process routes were discussed. Processing could be a batch or continuous process"--Abstract, p. iii
Advisor(s)
Arthur E. Morris
Committee Member(s)
David G.C. Robertson
Mark E. Schlesinger
John L. Watson
Robert E. Moore
Department(s)
Materials Science and Engineering
Degree Name
Ph. D. in Metallurgical Engineering
Publisher
University of Missouri--Rolla
Publication Date
Spring 1993
Pagination
xiii, 131 pages
Note about bibliography
includes bibliographical references (pages 125-130)
Rights
© 1993 Weishi Mang, All rights reserved.
Document Type
Dissertation - Restricted Access
File Type
text
Language
English
Thesis Number
T 6544
Print OCLC #
29300503
Recommended Citation
Mang, Weishi, "Phase equilibria and thermodynamic modelling of the Pb-S-O system and applications to direct lead smelting" (1993). Doctoral Dissertations. 1025.
https://scholarsmine.mst.edu/doctoral_dissertations/1025
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