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1 edition of The agglomeration of fine material for bacterial heap leaching found in the catalog.

The agglomeration of fine material for bacterial heap leaching

A.J. Southwood

The agglomeration of fine material for bacterial heap leaching

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  • 30 Currently reading

Published by Council for Mineral Technology in Randburg, South Africa .
Written in English


The Physical Object
Pagination33 p.
Number of Pages33
ID Numbers
Open LibraryOL24707105M

  In one embodiment, the invention provides a support for mineral concentrates, the support comprising non-porous polymeric particles between 3 and 20 mm having a specific gravity less than 1, wherein the support is stable in highly corrosive environments, including strong acidic solutions, is resistant to abrasion, and is non-deformable at temperatures up to ° : Juan Rivadeneira Hurtado.   Application of bioleaching to copper mining in Chile. Juan Carlos Gentina* 1 Fernando Acevedo 1 1 Pontificia Universidad Católica de Valparaíso, Facultad de Ingeniería, Escuela de Ingeniería Bioquímica, Valparaíso, Chile *Corresponding author: [email protected] Keywords: dumps, heap leaching, hydrometallurgy, leaching microorganisms, pyrometallurgy. Kawatra, S. K., “Challenges and Opportunities in Ironmaking Processes in North America”, 3rd International Meeting on Ironmaking/2nd International Symposium on Iron . HEAP LEACHING. Heap leaching was introduced in the ’s as a means to drastically reduce gold recovery costs. This process has literally made many mines by taking low grade geological resources and transforming them to the proven ore category. Ore grades as low as oz Au per ton have been economically processed by heap leaching.

Industrial Microbiology. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. hxcalek. Terms in this set (33) What is known as the use of microorganisms on a large-scale to produce products or carry out chemical transformations? Industrial Microbiolgy.


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The agglomeration of fine material for bacterial heap leaching by A.J. Southwood Download PDF EPUB FB2

Based on the extensive experience of heap leaching operations, crushed ore agglomeration can be successfully considered and utilized as a pretreatment step for the heap leaching of ores containing significant amounts of fines and clay minerals.

The drum agglomeration is considered as a pretreatment step for the heap leaching of copper and gold ores whereas the agglomeration of uranium and nickel ores Cited by: Both industries prefer drum to conveyor agglomeration, particularly for clayey ore or ore having a high fines content.

Precious metal heap leaching operations opt for cement in a dosage from The requirements for effective agglomeration, characteristics for an ideal agglomerate and integrated flowsheet of crushed ore agglomeration-heap leaching system are discussed.

For heap leaching operations, the use of cost effective binders for agglomeration is being considered to prevent agglomerate breakdown and to limit the migration of fines.

Copper heap leaching operations frequently require a high level of acid, which makes Cited by: Based on the extensive experience of heap leaching operations, crushed ore agglomeration can be successfully considered and utilized as a pretreatment step for the heap leaching of ores containing.

The application of heap leach technology to recovery of economically important metals, notably copper, gold, silver, and uranium, is wide-spread in the mining industry. Unique to heap leaching is the relatively coarse particle size, typically 12–25 mm top size for crushed and agglomerated ores and larger for run-of-mine dump leaching by: An investigation has been conducted into the nature and rates of the physical, chemical, biological, and thermal processes involved in the heap biooxidation of pyrite from refractory gold ores.

A heap-scale model of the ideal process was developed, aided by a systematic experimental approach, which accounts for the following phenomena.

Grain-Scale Kinetics - The thermal and chemical Cited by: 9. Agglomeration of fine mineral particles as a precursor to heap leaching is an important means of enhancing leaching rates and metal recoveries, particularly in processing low grade ores.

heap leach circuit used in scoping study mining crushing agglomeration ix/sx/rip bacterial heap leaching u precipitation solid/liquid seperation yellow cake dewatering dry yellow cake mo precipitation solid/liquid seperation mos₂ precipitate dry mos₂ concentrate ni precipitation solid/liquid seperation nis precipitate dry nis concentrate.

This paper details an investigation into the feasibility of using agglomerated tailings in a 'dry' aggregate fill for underground mining. A test program began with the agglomeration of tailings materials from Eskay Creek Mine, British Columbia, using Portland cement as a binding agent.

Thereafter, a series of backfill tests were conducted in which agglomerates, river aggregate, and tailing Author: Karen Chovan. Large particle effect in chemical/biochemical heap leach processes-A review Article in Minerals Engineering Vol(11)– September with Reads How we measure 'reads'.

Leaching. Most copper leaching is done by piling broken ore (∼% Cu) into flat-surface, 3–10m high, 10 4 –10 5 m 2 heaps of ore and then sprinkling dilute sulfuric acid lixiviant on to the heap surface. The lixiviant trickles down through the heap and leaches copper from its minerals to produce a pregnant leach solution containing 1–5kg Cum −3.

Bacterial Leaching Biotechnology in the Mining Industry Preston Devasia and K A Natarajan Bacterial leaching is the extraction of metals from their ores using microorganisms. Microbial technology offers an eco­ nomic alternative for the mining industry, at a time when high-grade mineral resources are being depleted.

Why Bacterial Leaching. Application of bioleaching to copper mining in Chile Keywords: dumps, heap leaching, hydrometallurgy, leaching microorganisms, pyrometallurgy.

Agglomeration of the fine solids with the coarser fraction results in a homogeneous heap of high porosity facilitating the downCited by: The bacterial activity is maximized at a pH of –2, a temperature of ∼30°C, and an adequate O 2 supply.

The rate of leaching and the overall copper recovery are maximized by optimizing the conditions for diffusion control: crush size, acid curing, agglomeration, heap permeability, lixiviant composition, aeration, and bacterial activity.

The oxidized material was subsequently removed for further processing. An outcrop allowed for depth dependent sampling of altogether 36 samples at three sites over the complete depth of 6 m. The fine fraction was removed from the host rock and sent to the laboratory for analysis of the microbial community.

The pH ranged between and Copper heap leach operations often suffer from reduced efficiency due to long leach times and variable recoveries. Surfactants have been considered as an option in increasing the leachability of ores.

Improvements in overall copper extraction have been noted with their use, though testing has only been conducted on a limited scale. The molecular function of surfactants in heap leaching has not Author: Kush Shah. Microbial Leaching (Bioleaching, Biomining) Microbial leaching is the process by which metals are dissolved from ore bearing rocks using microorganisms.

For the last 10 centuries, microorganisms have assisted in the recovery of copper dissolved in drainage from water. Although time-consuming, it is cheap and versatile enough to be applied at any stage of a beneficiation operation, from the in situ leaching of material to the leaching of a sulphide concentrate The beneficiation of fine coal by M.

F Dawson (Book). The authors describe the opportunities of low-grade sulfide ores and mine waste processing with heap and bacterial leaching methods. By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in severe climatic conditions.

The paper presents perspectives for heap leaching of sulfide and mixed ores from the Udokan (Russia Cited by: 2. Heap leaching accounts for a fifth of global copper production, sourced primarily from porphyry ores, yet metal recoveries are often not optimal.

Gangue, and its interaction with acid, plays an important role in such processes. Thus, a proper understanding of gangue minerals present in the ore, their textural relationships relative to particle size distribution, reactivity with acid under Cited by: 1. Conventional bacterial leaching requires both fine grinding and the presence of iron-oxidizing bacteria to generate the ferric ions in leach solution that attack minerals (Chadwick, b).

Strictly speaking, the use of microorganisms and biological processes for the extraction of metals involves bioleaching, which is the oxidation and leaching. 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. The lack of a clear understanding of the rate of chalcocite (Cu₂S) and covellite (CuS) leaching in the presence and absence of bacteria has been a limitation on the optimization of hydrometallurgical processes for the recovery of copper from these minerals.

In order to enhance the performance of heaps and other leaching processes for these minerals, there is a need to examine the conditions Cited by: Hydrometallurgy proudly takes its place as the most up-to-date, comprehensive book published in this field.

Following the tradition of the previous international symposiums, this resource tackles the newest in primary and secondary resource recovery with sections on environmental hydrometallurgy, research and industrial applications, base and precious metals, and leaching.

heap leach showsgribouteam. Heap leaching Wikipedia. Heap leaching is an industrial mining process used to extract precious metals copper uranium and other compounds from ore using a series of chemical reactions that absorb specific minerals and reseparate them after their division from other earth materials.

Service Online. Copper Heap Leaching Common for oxides and low-grade secondary sulphides (Bacterial-assisted heap leaching common for chalcocite (Cu2S) and covellite (CuS) where bacterial activity assist in ferrous to ferric oxidation and direct conversion of sulphur. Ores containing high levels of acid-consuming.

The heap leaching operations inthe western D.S.A. arethelargest exploiting bacterial leaching asameans of metal-winning. There are also other techniques of bacterial leaching which are lesswidely employed, or which show promise asfuture methods for extracting metals.

These arediscussed below. HEAP LEACHING The large tonnages ofwaste rock and. This is a good paper on the effect of pretreating a coarse chalcopyrite ore with chloride and nitrate salts.

The results will be of general interest to the copper heap leaching community. There were only two things which I believe should be corrected: Line The authors state that pyro processing consumes more water and energy than hydro Cited by: 1.

Bacterial leaching of ores and other materials R. Näveke, Institut für Mikrobiologie, Technische Universität Braunschweig, Fed. Rep. Germany: Summary In nature sulfidic ores are decayed by weathering under the influence of oxygen and water.

Microbiological investigations reveal that certain bacteria are the main agent in this process. Examples are copper heap leaching on the edge of the Great Sandy Desert, northwestern Australia, nickel/copper heap leaching in sub-arctic conditions or copper leaching in the tropics.

Typical irrigation rates per square meter of surface are in the range 5–10 Lh − by: 6. Heap leaching from low-grade ores has become a major contributor to the total global production of copper, gold, silver, and uranium cr ip t (Padilla et al., ).

Heap leaching also has been considered for zinc (Lizama et al., ; Petersen and Dixon, ) and nickel (Carlsson and Büchel, ; Shakir et us. Start studying Advanced Treatments / Chapter Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Bioleaching is the extraction of metals from their ores through the use of living is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt.

Both oxide and sulfide ores can be leached, though the leach cycles are much different and sulfide leaching requires a bacterial, or bio-leach, component. In leaching, both heap leaching and in-situ leaching, produced million metric tons of copper, 22 percent of world production.

EPA / HEAP LEACH TECHNOLOGY AND POTENTIAL EFFECTS IN THE BLACK HILLS EPA Contract No. Work Assignment No. 1 Prepared For U.S. Environmental Protection Agency Water Management Division State Programs Branch 18th Street, Suite Denver, Colorado Septem Prepared By Engineering-Science Design-Research.

Heap Leaching Since the 's and early 's, heap leaching has developed into an efficient way to beneficiate a variety of low-grade, oxidized gold ores. Compared to tank leaching, heap leaching has several advantages, including simplicity of design.

At/y two-stage heap leach process has been used at Mt Leyshon Gold Mine, 24 km south of Charters Towers, northern Queensland, since Augusttreating copper/gold ore. The process employs a first stage bacterial heap leach to remove the copper prior to ore neutralisation and a second stage heap leach gold extraction using cyanide.

Indirect bacterial leaching in this process the microbes are not in direct contact with minerals, but leaching agents are produced by these microbes which oxidize the ores. There are three commercial process used in bioleaching; a. Slope leaching b. Heap leaching c.

In situ leaching 8. In heap bioleaching, acidophilic extremophiles contribute to enhanced metal extraction from mineral sulphides through the oxidation of Fe(II) and/or reduced inorganic sulphur compounds (RISC), such as elemental sulphur or mineral sulphides, or the degradation of organic compounds derived from the ore, biota or reagents used during mineral processing.

The impacts of variable solution acidity Cited by: 6. Hydrometallurgy - Proceedings of the Sixth International Symposium Details Following the tradition of the previous international symposiums, this resource tackles the newest in primary and secondary resource recovery with sections on environmental hydrometallurgy, research and industrial applications, base and precious metals, and [email protected]{osti_, title = {Geothermal enhancement of mineral processing in Nevada: Final report, Ap J }, author = {Flynn, T and Trexler, D T and Hendrix, J L}, abstractNote = {This report reviews mineral recovery techniques practiced at active mines throughout Nevada and determines those that may be enhanced by the application of geothermal heat energy from a nearby.

Topic 5: Mining Methods Part I-Surface mining Hassan Z. Harraz [email protected] This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.

Permission of the author and publisher is required for any other usage.