Bioleaching: metal solubilization by microorganisms ...

5.2.1Dump leaching. Dump leaching is the oldest process. The size of the dumps varies considerably and the amount of ore may be in the range of several hundred thousand tons of ore. The top of the dump is sprinkled continuously or flooded temporarily .

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Recovery of copper by dump leaching with use of bacteria ...

The ore piles in the proximity of the Vlaikov Vrah mine, Bulgaria, contain about thirty million tons of waste low-grade copper sulphide and mixed ores. In 1972 industry began using these ores for recovering copper by means of microbial leaching.

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Alumina recovery from copper dump leaching liquors using a ...

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Welcome to CDC stacks | Alumina recovery from copper dump ...

"The U.S. Bureau of Mines investigated the separation of aluminum from copper dump leaching liquors using a supported liquid membrane. Aluminum was selectively transported through porous polypropylene impregnated with di ( ethylhexyl) phosphoric acid in an aliphatic diluent.

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Processing Gold Ores Using Heap Leach-Carbon Adsorption ...

Information Circular 8770 Processing Gold Ores Using Heap Leach-Carbon Adsorption Methods By H. J. Heinen, D. G. Peterson, and R. E. Lindstrom UNITED STATES DEPARTMENT OF THE INTERIOR Cecil D. Andrus, Secretary BUREAU OF MINES

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Gold and Silver Leaching Practices in the United States

Gold and silver heap and dump leaching operations in the Western United ... eta1 values are recovered from cyanide leach solutions using either zinc precipitation or charcoal adsorption. Potential problems that may hamper on block development of a leaching operation are poor

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Bacterial leaching of ores and other materials

Bacterial ore leaching can be applied to extract heavy metals from low grade ores, industrial wastes and other materials on an industrial scale by different procedures: dump leaching, in situ leaching, tank leaching, leaching in suspension. Sulfidic copper and uranium ores are the principle ores leached in several countries.

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Producing Copper Nature's Way: Bioleaching

In 2001, bioleaching constituted approximately 10% of Chilean copper production and heap and dump leaching, in general, constituted approximately 30% of Chilean production. 2 The first Chilean plant to be put into operation was S.M. Pudahuel. The plant was initiated in 1982 using the Thin Layer Bacterial leach process (TLB) - a water saving ...

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Relationship between particle size distribution and ...

Using dump leaching as the case study, the objective of this research was to determine the particle size distribution and quantify the effect of particle size distribution on the porosity of highly heterogeneous dump leach pads.

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Formative mechanism of preferential solution flow during ...

WU Ai-xiang, et al: Formative mechanism of preferential solution flow during dump leaching • 591 • movement of the ore particle could be rolling or free fall motion. The speed of the coarse ore is greater than that of the fine ore because of the

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Bioleaching: metal solubilization by microorganisms | FEMS ...

5.2.1 Dump leaching. Dump leaching is the oldest process. The size of the dumps varies considerably and the amount of ore may be in the range of several hundred thousand tons of ore. The top of the dump is sprinkled continuously or flooded temporarily .

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Recovery of copper by dump leaching with use of bacteria ...

In 1972 industry began using these ores for recovering copper by means of microbial leaching. The present paper discusses the results obtained during, the year period of the industrial copper dump) leaching operation. The flowsheet is presented and each separate component of the complex production process is described.

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Application of aerial image analysis for assessing ...

The operation produces copper cathodes using heap and dump leaching, solvent extraction, and electrowinning. This study aimed at investigating the particle size distribution of the dump leach pad, which was constructed via end dumping of the run-of-mine ore using haulage trucks without further crushing of the ore.

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dump leaching method - sonexafrica.co.za

Dump leaching is an industrial process to extract precious metals and copper from ores. Dump leaching is similar to heap leaching, however in the case of dump leaching ore is taken directly from the mine and stacked on the leach pad without crushing where, ...

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LeachingStudies - USGS

Results showed that the leaching potential of historical mine-waste samples is achieved in a relatively short period of time. Although some metal concentrations increase over time, the geochemical trend and the fingerprint are effectively established using the minute Field Leach Test.

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Gold and Silver Leaching Practices in the United States

Gold and silver heap and dump leaching operations in the Western United ... eta1 values are recovered from cyanide leach solutions using either zinc precipitation or charcoal adsorption. Potential problems that may hamper on block development of a leaching operation are poor

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Dump Leaching Copper Recovery - 911metallurgist.com

Dump leaching of low-tenor ores is a simple procedure whereby leach solution is distributed over the top of the dump to dissolve the copper minerals as the solution percolates through the bed. The enriched leach liquor is collected at the base of the dump, treated to recover the copper, and recycled to the dump…

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Copper Electrorefining - Last step - Department of Chemistry

The leaching of the "oxide" materials is relatively easy and relies on dump, vat and agitation leaching using dilute sulfuric acid solutions. Both the Asarco Ray Mine and the Silverbell Mine are leaching low-grade copper with weakly acidic solutions.

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Alumina Recovery from Copper Dump Leaching Liquors Using a ...

The U.S. Bureau of Mines investigated the separation of aluminum from copper dump leaching liquors using a supported liquid membrane. Aluminum was selectively transported through porous polypropylene impregnated with di ( ethylhexyl) phosphoric acid in an aliphatic diluent.

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Leaching and recovery of platinum group metals from UG ...

Leaching and recovery of platinum group metals from UG concentrates yields were not good (less than 40 per cent). Platinum leaching was particularly poor with cyanide (ambient

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In-situ and dump leaching technology: Application to ...

using in-situ or dump leaching. A flowsheet of this technology is given in Fig. 1 which shows also the recovery of uranium and the lanthanides present

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heap leaching sulfide gold processing cheap - aelabworld.co.za

 · Heap leaching is an industrial mining process to extract precious metals, copper, uranium, and range from 30% of contained (run of mine dump leaching sulfide copper ores) to over 90% for the easiest to leach ores (some oxide gold ores).

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Dump leaching - Wikipedia

Dump leaching is an industrial process to extract precious metals and copper from ores. Dump leaching is similar to heap leaching, however in the case of dump leaching ore is taken directly from the mine and stacked on the leach pad without crushing where, ...

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The effect of sodium chloride on the dissolution of ...

the trickle leaching of chalcopyrite by acidified ferric sulfate solutions is limited to temperatures above about 50~ Since dump leaching is done using effluent temperatures below 50~ large chloride-ion additions would not appear to be beneficial to dump leaching. 1. J. T.

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Visualization of flow behavior during bioleaching of waste ...

With increasing use of dump leaching technology, it is clear that deep insight into the effects of the driving parameters including chemical, physical, microbial factors, and their interactions, is the key to successful implementation and improvement of the technology (Pradhan et al., 2008).

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Alternative Methods for Copper Recovery from Dump Leach ...

The Bureau of Mines conducted large-scale laboratory copper ore leaching tests to enable improving copper recovery from large dump- leaching operations. This was done by comparing leaching progress when copper was recovered from recycled leach liquor either by cementation or by solvent extraction.

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Alumina recovery from copper dump leaching liquors using a ...

Add tags for "Alumina recovery from copper dump leaching liquors using a supported liquid membrane". Be the first.

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Application of aerial image analysis for assessing ...

The operation produces copper cathodes using heap and dump leaching, solvent extraction, and electrowinning. This study aimed at investigating the particle size distribution of the dump leach pad, which was constructed via end dumping of the run-of-mine ore using haulage trucks without further crushing of the ore.

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Science Break: Metal Leaching | Mar. 2017 | CSEG RECORDER

Dump leaching is relatively cheap, so is commonly used for low grade ores. After a year or two, a typical low grade ore will yield ~50% of its metal in this way. Dump leaching operations, if not done properly, can result in significant environmental damage.

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Waste Dump Leaching Copper

Dump leaching is an important supplement to open pit-mill production of copper, providing about 1.0 percent of the total copper recovered. Because dump leaching is slow and incomplete, much copper remains in the dumps after leaching has been terminated.

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A Simplified Economic Filter for Open-Pit Mining and Heap ...

States use heap- and dump-leaching methods exclusively. The two approaches considered are (1) an empirical model which relates mining costs to mining rates using data from recently developed or proposed copper mines; and (2) the original Camm (1991) models, updated using appropriate cost inflators. The cost models of O’Hara and

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Alternative Methods for Copper Recovery from Dump Leach ...

The Bureau of Mines conducted large-scale laboratory copper ore leaching tests to enable improving copper recovery from large dump- leaching operations. This was done by comparing leaching progress when copper was recovered from recycled leach liquor …

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Energy and Environmental Profile of the U.S. Mining Industry 5

Energy and Environmental Profile of the U.S. Mining Industry 5 Copper For nearly 5,000 years, copper was the only metal known to man. It remains one of the ... autoclaving, chlorination, dump and in situ leaching, ion exchange, solvent extraction, electrowinning, and precipitation. Crushing and grinding is the most energy intensive.

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A Simple Field Leach Test for Rapid Screening and ...

leaching of the non-grid composites, using the Field leach Test, and data from grid composites from the same sites that were leached in the laboratory using modified EPA Method 1312 (SPLP) and the laboratory version of the Field Leach Test. COLLECTION …

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Copper Dump Leaching and Management Practices That ...

2) Dump leaching and heap leaching are distinguished by the use of liners. Dump leaching refers to the leaching of low-grade ore that has been deposited directly on the existing topography. The pregnant leach solution is typically collected in unlined natural drainage basins.

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HEAP LEACHING - metsim.com

Screen-shot of a dump leach built in METSIM using actual survey data. Each cell . is individually controlled based on stacking sequence and leaching cycles. As with any simulation, model verification is key to the success of the model.

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1.1 PHASES OF A MINING PROJECT - Home | ELAW

electrowinning, leaching, precipitation, and amalgamation (often involving the use of mercury). Wastes from these processes include waste rock dumps, tailings, heap leach materials (for gold and silver operations), and dump leach materials (for copper leach operations). Leaching involving the use of cyanide is a kind

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Alumina Recovery From Copper Dump Leaching Liquors Using …

ALUMINA RECOVERY FROM COPPER DUMP LEACHING LIQUORS USING A SUPPORTED LIQUID MEMBRANE By S. P. Sandoval1 and L. E. Schultze2 ABSTRACT The U.S. Bureau of Mines investigated the separation of aluminum from copper dump leaching

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Producing Copper Nature's Way: Bioleaching

Agitated leaching - intermediate- to high-grade, chalcopyrite concentrates are deposited in a tank and leached using mechanical agitation. (Experimental only) The raw material type also determines the type of microorganisms involved: Waste dump leaching uses mesophilic (ambient temperature) microorganisms, i.e., bacteria.

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Bacterial leaching of ores and other materials

Bacterial ore leaching can be applied to extract heavy metals from low grade ores, industrial wastes and other materials on an industrial scale by different procedures: dump leaching, in situ leaching, tank leaching, leaching in suspension. Sulfidic copper and uranium ores are the principle ores leached in several countries.

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