Column Leaching Experiments and Mass Balance Modeling Simulating In-Situ Leaching within the Oxide Zone of the Florence Porphyry Copper Deposit, Pinal County, Arizona
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azu_td_hy_0194_sip1_w.pdf
Author
Brewer, Michael D.Issue Date
1998Committee Chair
Bassett, Randy
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The University of Arizona.Rights
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.Abstract
Column leaching experiments were conducted to simulate in-situ leaching processes and to provide information on the mechanisms and extent of copper recovery, acid consumption, and chemical composition of recycled raffinate. Two 1.52-meter by 0.30-meter columns, each loaded with approximately 150 kilograms of copper oxide ore from the Florence porphyry copper deposit, were leached with a dilute sulfuric acid solution for 84 days. Computer simulation of the saturation state and aqueous mass transfer of predominant elements during the column tests was performed using EQ3NR, an aqueous solution speciation-solubility modeling code and the geochemical mass balance modeling code NETPATH. These modeling codes were used to quantify the amount of minerals dissolved and precipitated in the columns during the column leaching experiments. NETPATH mass balance models containing Cu-montmorillonite and chrysocolla as sources of copper match observations of pre-leach material. Cu-montmorillonite contributed 55% and 34% of the dissolved copper in the columns effluent.Type
Thesis-Reproduction (electronic)text
Degree Name
M.S.Degree Level
mastersDegree Program
Hydrology and Water ResourcesGraduate College