The rates of oxidation of arsenopyrite and chalcopyrite by Fe³⁺ at concentrations of 10⁻² to 10⁻⁵ molal with a pH near 2 and temperatures of 0 to 60°C, conditions similar to those found in weathering sulfide ore deposits, have been determined. The rate equations for 25°C are:
dn<sub>Fe</sub>3+/dt = 1.9±0.4 x 10⁻⁷ (A) (m<sub>Fe</sub>3+)<sub>0.43±0.01</sub>
dn<sub>Fe</sub>3+/dt = 1.5±0.4 x 10⁻³ (A) (m<sub>Fe</sub>3+)<sub>0.94±0.04</sub>
for chalcopyrite and arsenopyrite respectively. The E<sub>a</sub> of chalcopyrite is 63±2 kJ mol⁻¹ (40 - 60°C). The E<sub>a</sub> of arsenopyrite varied with temperature from 18±2 kJ mol⁻¹ (0 - 25°C) to -6±2 kJ mol⁻¹(25 - 60°C). / M.S.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/106187 |
| Date | January 1987 |
| Creators | Gagen, Patrick M. |
| Contributors | Geology |
| Publisher | Virginia Polytechnic Institute and State University |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | vi, 47 leaves, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 16679395 |
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