Doctoral Dissertations

Alternative Title

Phase equilibria and thermodynamic modelling of the lead-sulfur-oxygen system and applications to direct lead smelting


Weishi Mang


"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


Arthur E. Morris

Committee Member(s)

David G.C. Robertson
Mark E. Schlesinger
John L. Watson
Robert E. Moore


Materials Science and Engineering

Degree Name

Ph. D. in Metallurgical Engineering


University of Missouri--Rolla

Publication Date

Spring 1993


xiii, 131 pages

Note about bibliography

includes bibliographical references (pages 125-130)


© 1993 Weishi Mang, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type




Thesis Number

T 6544

Print OCLC #


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