Humid oxidation of pyrite
department or school: Applied Science, Faculty of
department or school: Materials Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Stenhouse, James Fairley
issued: 2012-03-05T17:55:03Z
issued: 1950
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: A study of the humid oxidation of pyrite, that is, oxidation of pyrite in aqueous medium under oxygen pressure, was undertaken to learn something of the reaction kinetics and mechanism Involved in the primary humid oxidation reactions. The method of investigation is based on measuring the oxygen consumption by the reaction and using this measurement to determine the reaction rates. Experimentally, this measurement is accomplished by recording the change in pressure in an oxygen storage bottle feeding the reaction. Based on the experimental results of this Investigation, a model for the oxidation process is proposed. During the reaction, a stable oxide layer forms on the surface of the pyrite particle and in the model for the oxidation process, the following steps are proposed: 1. Adsorption of oxygen molecules to the surface of the particle and dissociation of the molecules to atoms on the surface. 2. Transfer of electrons from sulfur atoms, through the oxide layer, to adsorbed oxygen atoms. 3. Interstitial diffusion of sulfur ions through the oxide layer to the surface of the particle. 4. Reaction between sulfur ions and oxygen on the surface and desorption of the products of this reaction into solution. 5. Diffusion of lattice defects created at the pyrite oxide interface by sulfur removal to the surface of the particle and diffusion of oxygen atoms into the oxide layer. The mathematical expressions which are developed for the effect of reaction variables are based on this model and are supported by experimental results.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/41135
note: HUMID OXIDATION OF PYRITE. by JAMES FAIRLEY STENHOUSE A thesis submitted i n p a r t i a l f u l f i l m e n t the requirements f o r the degree of MASTER OF APPLIED SCIENCE i n the Department of Mining and Metallurgy at the University of B r i t i s h Columbia THE UNIVERSITY OF BRITISH COLUMBIA September, 1 9 5 0 . ABSTRACT. A study of the humid oxidation of p y r i t e , that i s , oxidation of p y r i t e i n aqueous medium under oxygen pressure, was undertaken to learn something of the reaction k i n e t i c s and mechanism Involved i n the primary humid oxidation reactions. The method of investigation i s based on measuring the oxygen consumption by the reaction and using t h i s measurement to determine the reaction rates. Experi-mentally, t h i s measurement i s accomplished by recording the change in pressure i n an oxygen storage b o t t l e feeding the reaction. Based on the.experimental r e s u l t s of t h i s Investigation, a model for the oxidation process i s pro-posed. During the reaction, a stable oxide layer forms on the surface of the p y r i t e p a r t i c l e and i n the model for the oxidation process, the following steps are. proposed; 1. Adsorption of oxygen molecules to the surface of the p a r t i c l e and d i s s o c i a t i o n of the molecules to atoms on the surface. 2. Transfer of electrons from sulfur atoms, through the oxide layer, to adsorbed oxygen atoms. 3. I n t e r s t i t i a l d i f f u s i o n of sulfur ions through the oxide layer to the surface of the p a r t i c l e . ^. Reaction between sulfu r ions and oxygen on the surface and desorptlon of the products of t h i s reaction into solution. 5. D i f f u s i o n of l a t t i c e defects created at the p y r i t e oxide interface by sulfur removal to the surface of the p a r t i c l e and d i f f u s i o n of oxygen atoms into the oxide layer. The mathematical expressions which are developed f o r the e f f e c t of reaction variables are based on t h i s model and are sup…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0106621
language: eng
degree discipline: Metals and Materials Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
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.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/41135