Percolation Leaching of a Chalcopyrite-Bearing Ore at Ambient and Elevated Temperatures W ith Bacteria . By B. W. Madsen and R. D. Groves . UNITF.D STATES DEPARTMENT OF THE INTERIOR . Report of Investigations 8827 . Percolation Leaching of a Chalcopyrite-Bearing Ore at A mbient and Elevated Temperatures With Bacteria . By B. W. Madsen and R. D ...
This invention relates to the recovery of precious metals such as gold, silver, copper, and uranium by percolation or heap leaching, and in particular relates to the treatment of ores of these ...
The present work addresses the problem of improving the percolation properties of heap leaching piles of clay, slime-oxidised and mixed ores. These ores are prone to colmatation, which hinders percolation of the solution through the ore layer. Laboratory tests on percolation leaching were carried out using a 2 m column having an internal diameter of 190 mm, loaded …
Unstratified and artificially stratified samples of oxide-copper ore were percolated with water followed by acid leaching in a custom-made laboratory apparatus.
The leaching rate for copper ore was increased from 50% to 60% by adding surfactant into the leaching solution. According to the figure, addition of surfactant improved the permeability of the ore and also improved the leaching rate. ... The effects of simulated stacking phenomena on the percolation leaching of crushed ore, Part 1: Segregation ...
The present work addresses the problem of improving the percolation properties of heap leaching piles of clay, slime-oxidised and mixed ores. These ores are prone to colmatation, which hinders percolation of the solution through the ore layer. Laboratory tests on percolation leaching were carried out using a 2 m column having an internal …
1. Introduction. Heap leaching is a low-cost, flexible hydrometallurgical process for recovering valuable metals from low-grade ores (Nosrati et al., 2012).In this process, the ore bed must be porous and permeable to permit flow of the leach solution (Lewandowski and Kawatra, 2009a).However, fine particles usually migrate into the porous structures and clog the natural …
solids) and increases percolation of acid into solids at differ-ent agitation speeds [1, 5]. Buffle plates, in addition to agita-tors, may be used to maximize slurry mixing [6]. Com-pressed air leaching in pachuca tanks is the most common method for leaching copper ore [7-9]. Non-oxidative leach-ing of copper in the absence of oxygen has been ...
The technical feasibility of treating exotic copper ore with an acid cure using concentrated H2S04 is studied. Applications in a conventional percolation leaching circuit for unaltered ore and in a conventional agitation leaching circuit for altered ore are examined. The main effects of an acid cure are to inhibit silica dissolution and to increase the sedimentation rate of agitated pulps.
Heap leaching accounts for approximately 17% of global gold and 21% of global copper production, respectively (Marsden and Botz, 2017; Basov, 2015).It is the only economic technology available to extract value metals from low-grade ores; however, the slow rate of recovery is a major drawback, and in most cases is related to heap permeability (Petersen, …
Heap leaching of copper oxide ores usually incorporates the use of sulphuric acid (H 2 SO 4) and water to bind fines to larger ore particles during the agglomeration process. In addition, …
This paper outlines a comprehensive, cost-effective testing program for the acid-ferric sulfate heap leaching of oxide, supergene and primary copper ores.
Thus, owing to well-developed dual pore structure, desirable liquid retention and better leachability, the ore agglomeration has been widely utilized to recover copper metals …
in a total estimate of 60 million tons of copper ore reserves, with an average grade of 1.63 % [17]. There are many studies published in the literature on the leaching of non-Jordanian copper ores using various lixiviant. For example, Madsen et al. [19], developed a shrinking core model to describe the leaching of copper from sulfide ores
leaching of ore. Techniques and processes must be developed for leaching various metals from ore and host rock without the high cost of mining and subsequent environmental problems. …
The dissolution of carbonate gangue minerals, which are often ubiquitous in copper deposits, leads to the consumption of large amounts of acid during the leaching of such ores, which can make the process uneconomical (Habashi, 1970, Habashi, 1980, You-Cai et al., 2013).Table 1 shows the acid consumption and estimated time to complete the dissolution of …
The current state and future directions of percolation leaching in the Chinese mining industry: challenges and opportunities. Miner. Eng., 125 ... Evaluation of stucco binder for agglomeration in the heap leaching of copper ore. Miner. Eng., 24 (2011), pp. 886-893, 10.1016/j.mineng.2011.03.024. View PDF View article View in Scopus Google Scholar.
Introduction: Vat leaching is a widely utilized extraction technique in the field of hydrometallurgy, specifically for the recovery of valuable minerals from low-grade ores. This process involves the percolation of a leaching …
The results of the percolation leaching experiments showed that the most rapid increase in copper recovery occurred in the first ten days for the Sayak and Bayskoye ore samples. At the same time, a significant amount of …
The test provides a complete characterization of the potential hydrodynamic response of an ore sample under percolation leaching such as saturated ... K.A., Readett, D.J., Bos, J.L., 2000. Hydrometallurgical Processing of Copper Ores—Heap Leach, Solvent Extraction and Electrowinning at Girilambone Copper Company, MINPREX, Melbourne, …
Analogous to Ghorbani et al. (2013), copper leaching kinetics is described by: (9) X ̇ Cu (t) = k C acid 1-X Cu (t) α φ where X Cu is the extent of extraction as a mass fraction of the total copper content, α is the mass fraction of copper that is extractable at particle scale under the leaching conditions (i.e. being exposed to leach ...
Vat Leaching Copper Ore. ... Ores may be separated into sand and slime, and the sand leached by upward or downward as well as upward and downward percolation of cyanide solutions. Leaching practice has decreased in recent years with the development of closed-circuit grinding and now is seldom incorporated in new plants.
Percolation Leaching of a Chalcopyrite-Bearing Ore at Ambient and Elevated Temperatures W ith Bacteria . ... Leaching and copper recovery. Bacterial inoculation ... Top view of leaching column showing solution distribution system Copper extraction from ore at ambient temperature Ferric iron concentration in leach solution during ambient ...
Percolation leaching of fragmented ground is covered, as well as true and modified in situ teaching. Solution mining of gold, copper and uranium ores, several slats extracted from …
• A lower leaching of copper: 80 % after 3 hours; • A very low leaching of cobalt: I 0-13 Ofr,; • Acid consumption depends on the leaching duration. 2.2 Percolation Leaching Tests Percolation tests were carried out in laboratory colunms. Different parti ele sizes were tested : mi nus I Omm, mi nus 15mm and minus 20mm.
The copper contents in the solutions was from 22 to 26 grs/l. The iron contents in ferrous ions fluctuated between 2 and 5 grs/l, the highest figures corresponding to the starting solution. Washing of the Solutions. The solutions from the leaching process contain more or less Fe2O3 or Al2O3 which depends on the characteristics of the ore being ...
applied the mixed kinetics model to the leaching, by percolation method, of low-grade chalcocite-covellite ore using sulfuric acid as lixiviant.Few studies have been done on the leachability of …
AbstractThe general feasibility of ammoniacal percolation leaching of copper sulphide ores has been demonstrated. The rates are comparable to those of conventional ferric sulphate-sulphuric acid systems, but without the attendant problems of carbonate or iron dissolution, For the ore column heights studied, the copper leaching rate increased approximately as the square root …
Another 1 kg of the ore sample was ground down using a series of roller mills and then pulverised to dimensions of less than 10 μm for chemical and mineralogical analyses. 2.4. Percolation column leaching Percolation column leaching tests were conducted in two types of columns: small laboratory column and large semi-pilot column.
This proves that this percolation leaching is diffusion controlled leaching. For the leaching process to be completed, it will require a longer leaching time to leach all the copper metal in the ore. As per this experiment, the copper …
Percolation leaching of fragmented ground is covered, as well as true and modified in situ teaching. Solution mining of gold, copper and uranium ores, several slats extracted from evaporates and brines, and sulfur are discussed. Mineral teaching chemistry and kinetics, hydrology (including flow equations for various wellfields and other fluid ...
Investigations were carried out in columns by percolation of leaching solution through the ore layer. Besides copper, the contents of iron, silicon, magnesium and calcium were determined in output leaching solutions. The X-ray analysis of initial sample and solid residues upon leaching was carried out.
