Studies on the curing and leaching kinetics of mixed copper ores

Heap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents. An enriched solution containing the targeted metal is collected at the bottom. This technique involves complex chemical/...

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Main Author: Barriga Vilca, Abrahan
Language:English
Published: University of British Columbia 2013
Online Access:http://hdl.handle.net/2429/44500
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spelling ndltd-LACETR-oai-collectionscanada.gc.ca-BVAU.-445002013-06-05T04:21:33ZStudies on the curing and leaching kinetics of mixed copper oresBarriga Vilca, AbrahanHeap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents. An enriched solution containing the targeted metal is collected at the bottom. This technique involves complex chemical/electrochemical reactions and transport processes. Among the main features of this method of extraction include low capital and operative cost, modularity, and relatively high inventory of solutions. The need to optimize a heap operation has led to research studies in order to understand and interpret the chemistry and transport involved in a heap leach. These scientific investigations are focused on mathematical expressions of the reactions and transport phenomena of the minerals and reagents from the particle scale to the bulk scale. However, it was envisaged that pretreatment of these minerals are not accounted for in existing mathematical models of heap leaching. Sulfuric acid curing is a pretreatment to accelerate the extraction kinetics of copper ores and is widely used in copper operations. The curing process involves the addition of a highly concentrated sulfuric acid to the copper ore during agglomeration. Then, chemical reactions already begin prior to irrigation of the heap, transforming the initial copper species into new copper species which are easier to solubilize once the leach solution is provided to top of the heap. The present study aims to provide a means for the systematic integration of the curing pretreatment and the subsequent leaching process. The numerical implementation of the model is done using the Matlab programming language. The focus of this curing and leaching model is to represent the leaching kinetics of each mineral species, which involves solution of a system of ordinary differential equations. The numerical parameters of the proposed curing and leaching kinetic model were found from a set of laboratory experiments. Additionally, novel methods for determining the optimum agglomeration moisture, the optimum sulfuric acid dose for acid curing, and the relevant solute transport parameters were employed. The resulting model can be applied for design, scale-up, and optimization of a new or existing commercial heap leach operation.University of British Columbia2013-05-21T18:28:43Z2013-05-22T09:10:52Z20132013-05-212013-11Electronic Thesis or Dissertationhttp://hdl.handle.net/2429/44500eng
collection NDLTD
language English
sources NDLTD
description Heap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents. An enriched solution containing the targeted metal is collected at the bottom. This technique involves complex chemical/electrochemical reactions and transport processes. Among the main features of this method of extraction include low capital and operative cost, modularity, and relatively high inventory of solutions. The need to optimize a heap operation has led to research studies in order to understand and interpret the chemistry and transport involved in a heap leach. These scientific investigations are focused on mathematical expressions of the reactions and transport phenomena of the minerals and reagents from the particle scale to the bulk scale. However, it was envisaged that pretreatment of these minerals are not accounted for in existing mathematical models of heap leaching. Sulfuric acid curing is a pretreatment to accelerate the extraction kinetics of copper ores and is widely used in copper operations. The curing process involves the addition of a highly concentrated sulfuric acid to the copper ore during agglomeration. Then, chemical reactions already begin prior to irrigation of the heap, transforming the initial copper species into new copper species which are easier to solubilize once the leach solution is provided to top of the heap. The present study aims to provide a means for the systematic integration of the curing pretreatment and the subsequent leaching process. The numerical implementation of the model is done using the Matlab programming language. The focus of this curing and leaching model is to represent the leaching kinetics of each mineral species, which involves solution of a system of ordinary differential equations. The numerical parameters of the proposed curing and leaching kinetic model were found from a set of laboratory experiments. Additionally, novel methods for determining the optimum agglomeration moisture, the optimum sulfuric acid dose for acid curing, and the relevant solute transport parameters were employed. The resulting model can be applied for design, scale-up, and optimization of a new or existing commercial heap leach operation.
author Barriga Vilca, Abrahan
spellingShingle Barriga Vilca, Abrahan
Studies on the curing and leaching kinetics of mixed copper ores
author_facet Barriga Vilca, Abrahan
author_sort Barriga Vilca, Abrahan
title Studies on the curing and leaching kinetics of mixed copper ores
title_short Studies on the curing and leaching kinetics of mixed copper ores
title_full Studies on the curing and leaching kinetics of mixed copper ores
title_fullStr Studies on the curing and leaching kinetics of mixed copper ores
title_full_unstemmed Studies on the curing and leaching kinetics of mixed copper ores
title_sort studies on the curing and leaching kinetics of mixed copper ores
publisher University of British Columbia
publishDate 2013
url http://hdl.handle.net/2429/44500
work_keys_str_mv AT barrigavilcaabrahan studiesonthecuringandleachingkineticsofmixedcopperores
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