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- Oxidation kinetics of lead sulfide
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UBC Theses and Dissertations
Oxidation kinetics of lead sulfide Constantineau, Jean Pierre
Abstract
This project is a theoretical and experimental study of the oxidation kinetics of lead sulfide. Experimental intrinsic kinetic data applicable to the pre-ignition oxidation of lead sulfide particles has been undertaken to enable a better understanding of flash smelting processes through modelling. A thorough literature review has shown that the knowledge needed for modelling the oxidation of lead sulfide is limited even though numerous studies have already been done on the subject. The main objectives of this project were to obtain the activation energy of the oxidation of lead sulfide in the presence of sulfur dioxide as well as the reaction order with respect to the oxygen and sulfur dioxide concentrations. Experiments were performed to verify the effect of temperature, oxygen and sulfur dioxide concentrations on the reaction rates of lead sulfide oxidation. Between 250 and 450°C, under an atmosphere of 20.4% O2 and 2.7% SO2, the observed activation energy is 36.8 +/- 5.6 kJ/mol. The reaction order with respect to the oxygen concentration is fractional. Sulfur dioxide does not seem to have an effect on the initial oxidation rates. In all cases, lead sulfate was the oxidation product. The observations can be explained by a reaction mechanism that includes adsorption and ionic diffusion through the sulfate layer. A new type of diagram describing gas-solid reactions has been created. These diagrams unite thermodynamics and kinetics into a new tool that should be useful for many metallurgical and chemical systems. These diagrams are created from predominance diagrams by applying a mathematical transformation derived from kinetic equations. The diagrams, called modified predominance diagrams, predict the reaction product for given kinetics conditions and atmospheric compositions. The approach presented to modify the predominance diagrams can also be used for hydrometallurgical systems to modify Eh-pH diagrams. Their applicability for this purpose, has, however, not been verified. [Scientific formulae used in this abstract could not be reproduced.]
Item Metadata
Title |
Oxidation kinetics of lead sulfide
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1999
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Description |
This project is a theoretical and experimental study of the oxidation kinetics of lead sulfide.
Experimental intrinsic kinetic data applicable to the pre-ignition oxidation of lead sulfide
particles has been undertaken to enable a better understanding of flash smelting processes
through modelling.
A thorough literature review has shown that the knowledge needed for modelling the
oxidation of lead sulfide is limited even though numerous studies have already been done on
the subject. The main objectives of this project were to obtain the activation energy of the
oxidation of lead sulfide in the presence of sulfur dioxide as well as the reaction order with
respect to the oxygen and sulfur dioxide concentrations.
Experiments were performed to verify the effect of temperature, oxygen and sulfur dioxide
concentrations on the reaction rates of lead sulfide oxidation. Between 250 and 450°C, under
an atmosphere of 20.4% O2 and 2.7% SO2, the observed activation energy is 36.8 +/- 5.6
kJ/mol. The reaction order with respect to the oxygen concentration is fractional. Sulfur
dioxide does not seem to have an effect on the initial oxidation rates. In all cases, lead sulfate
was the oxidation product. The observations can be explained by a reaction mechanism that
includes adsorption and ionic diffusion through the sulfate layer.
A new type of diagram describing gas-solid reactions has been created. These diagrams unite
thermodynamics and kinetics into a new tool that should be useful for many metallurgical and
chemical systems. These diagrams are created from predominance diagrams by applying a
mathematical transformation derived from kinetic equations. The diagrams, called modified
predominance diagrams, predict the reaction product for given kinetics conditions and
atmospheric compositions.
The approach presented to modify the predominance diagrams can also be used for
hydrometallurgical systems to modify Eh-pH diagrams. Their applicability for this purpose,
has, however, not been verified. [Scientific formulae used in this abstract could not be reproduced.]
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Extent |
6501381 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-06-12
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0078596
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1999-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.