The objective of this study is to develop a model which describes the heap leaching process for gold extraction from non-refractory ores. The model considers the cyanidation reaction in a bed of uniformly sized spherical porous mineral particles, through which the leaching solution trickles. The leaching agents diffuse into the porous particles to react with the grains of metallic gold.
hydrometallurgy ELSEVIER Hydrometallurgy l997) I-20 Model for heap leaching of gold ores by cyanidation A.E. Schez-Chac *,G.T. Lapidus Departamento de Ingenieria de Procesos a Hidrlica, Uniuersidad Automa Metropolitana -- 1. tapalapa. Apdo. Postal 55-532, Mico. D.F. 09340, Mexico Received 5 January 1996; accepted 27 June 1996 Abstract The objective of this study is to develop a model
The mined ore is usually crushed into small chunks and heaped on an impermeable stone or clay lined leach pad where it can be irrigated with a leach solution to dissolve the valuable metals. While sprinklers are occasionally used for irrigation, more often operations use drip irrigation to minimize evaporation, provide more uniform distribution of the leach solution, and avoid damaging the exposed mineral. The solution then percolates through the heap and leaches both the target and other minerals. This process
Heap leaching is a low-cost technology used in industrial mining to recover precious metals such as gold and uranium, along with several other highly sought after metals like copper, from their primary resources (ores and minerals). For many decades, there has been a growing demand for heap leaching due to its environmental benefits. Heap leaching provides mining operators with a benign
Heap leaching involves stacking of metal-bearing ore into a heap on an impermeable pad, irrigating the ore for an extended period of time with a stone solution to dissolve the sought-after metals, and collecting the leachant as it percolates from the base of the heap. Heap leaching is performed in different configurations, each with certain advantages and disadvantages. Gold and silver are
A model of cyanide heap leaching of copper–gold ores which accounts realistically for each of these four processes will be presented and validated against experimental data in a subsequent paper. As inferred from the above, this model must contain at least the following elements in order to represent the true behavior of copper–gold ores under cyanide heap leaching conditions in a
Modelling and simulation of gold ore leaching S. BELLEC*, D. HODOUIN*, C. BAZIN*, M.R. KHALESI*, C. DUCHESNE† *Department of mining, metallurgical and material engineering †Department of stone engineering Laval University, Quebec, QC, Canada A leaching model for gold ore that takes into account the impact of cyanide and oxygen
Heap leaching of caliche ore is carried out by the stacking of ROM (Run-Of-Mine) material, where the particle size distribution covers a wide range, from a few millimeters up to several decimeters, even diameters about 1 m. During the leaching, the multiple soluble species of caliche, which can reach total fractions larger than 40%, are dissolved at different rates, mainly controlled by their
1. Introduction. Heap leaching is an efficient method for the extraction of metals from low grade ores. As early as 1950s, Portugal began to use heap leaching for extraction of uranium from low grade uranium ore and was considered to be the earliest user of heap leaching for uranium ().But it did not get wide application, since there were large amounts of high grade uranium ores at that time.
Heap leaching is BAT for suitable ores because it allows the economical processing of ore that would otherwise be uneconomic under con ditions that can technically achieve regulatory acceptable levels of environmental risk mitigation. All of the materials used in heap leaching process and industry specifications of materials are
Heap leaching is used to extract gold, copper, silver, uranium, and iodine. This method was first employed to extract copper at the Bluebird mine in the US in the early 1960s, and then by several gold mines in the western parts of the US a few years later. Since then, heap leaching has been adopted successfully by many mines across the world.