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pre leaching for sulfide ore

A model for the bacterial leaching of copper sulfide ores in ...

Ore particle mass balances Considering the shrinking core model including external and internal mass transfer resistances (Braun et al., 1974; Madsen et al., 1975), the rate of leaching of the sulfide minerals contained in an ore particle at any point in the column can be stated as: 4nr .2, (Fe 3+ ) - 2 (11) - RcuFeS2 0iorlLG_~+D_~e~ i rio ...

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What is the best method for sulfide copper leaching?

One of the important subject in copper sulfide leaching, Ore Characterisation and related method. Bacteria Heap Leaching and Oxidative bacterial heap leaching two methods that apply for low grade ...

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Heap Leaching Oxide and Sulfide Copper Ores

Table of ContentsExperimentalOres used in this StudyAssaying of SamplesLaboratory StudiesProcedures Used in Laboratory StudiesExperimental DataDiscussion of ...

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Acid leaching of oxidesulfide copper ore prior the flotation ...

leaching process has achieved a better economic result. In the present study the leaching of oxide-sulfide copper ore was considered, and a modification of the existing process was performed by inserting the leach-ing process between the ore milling and the flotation sections. Therefore, a higher overall efficiency of the

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In situ recovery of copper sulfide ores: Alternative process ...

Dissolution of sulfide ores requires oxidative leaching conditions, then ISR can be conducted by applying bacterial leaching, a technology which is established in the copper industry for the treatment of copper sulfide ores in heaps and dumps (Ghorbani et al., 2016; Petersen, 2016). Therefore, the choice of the permeability stimulation approach which defines the leaching circuit, the efficiency of copper recovery and the process economics (operation size, capex, opex), needs to take into ...

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Sulphide Gold Ore Treatment by Leaching and Flotation Process

Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return. This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an ...

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Guides For High-sulfide Gold Processing

High sulfide gold ore refers to a certain gold ore with 20% -30% of gold wrapped by sulfide (mainly pyrite). Because most of the gold in high-sulfide gold ore exists in the form of sulfide-encapsulated gold, when using direct leaching process, the consumption of gold leaching agent and cost of gold leaching production will increase, and gold processing efficiency is not good.

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Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous Media

Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of agglomerated ore; the ...

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Recovery of Silver, Gold, and Lead From a Complex Sulfide Ore ...

byproduct lead from a complex sulfide ore using an acid system at atmospheric pres­ sure and moderate temperature. The pro­ posed method consists of--I. Leaching a sulfide ore with an acidic FeC13 solution to form insoluble silver and lead chlorides. A portion of the zinc is also extracted: Ag2S + 2 FeC13 + 2 AgCl (A)

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Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous Media

Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of agglomerated ore; the ...

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Heap bioleaching of a low-grade nickel-bearing sulfide ore ...

All the results suggest that the pre-leaching stage is a typical chemical leaching process. The pH value of the off-solution steadily decreased from pH 5.5 to pH 2 over 70 days and stabilized at pH 1.72.2 after 80 days of sulfuric acid pre-leaching which created ideal conditions for bacteria growth at the next stage.

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Study of the leaching and pore evolution in large particles ...

A long-term leach investigation was undertaken on particles of a sulfide ore to determine the nature of solution transport into large particles and to identify the primary roles concentrations of acid and oxidant on controlling solution transport.

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Sulfide Ore Processing « TCB Metals and Refining

Processing Sulfide Ores Historically, miners have shipped their sulfide concentrates to overseas smelters that have little to no regulations or emissions controls. However, with the implementation of the Mercury Export Ban of 2008 and the high costs of installing equipment to prepare sulfide ores for cyanide leaching, many companies are ...

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Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous Media

Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of agglomerated ore; the ...

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Copper heap leach development not as easy as it looks ...

Heap leaching has become increasingly popular in the copper industry for treating oxide and secondary sulphide ores, and is now being extended to primary sulphide ores. The ability to use heap ...

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A model for the bacterial leaching of copper sulfide ores in ...

Ore particle mass balances Considering the shrinking core model including external and internal mass transfer resistances (Braun et al., 1974; Madsen et al., 1975), the rate of leaching of the sulfide minerals contained in an ore particle at any point in the column can be stated as: 4nr .2, (Fe 3+ ) - 2 (11) - RcuFeS2 0iorlLG_~+D_~e~ i rio ...

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Improvements in gold ore cyanidation by pre-oxidation with ...

Here, the leaching of a sulfide ore (32% Fe, 2% Cu) is investigated using a mixture of sulfuric acid and hydrogen peroxide (0.15 M H2SO4 and 0.5 M H2O2), in proportions forming a slurry 10% w/w.

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PRE-FLOTATION LEACHING OF POLISH CARBONATE COPPER ORE

Pre-flotation leaching of Polish carbonate copper ore 87 Fig. 1. A selective chemical decomposition of carbonate-sulfide intergrowths during non-oxidative leach-ing with sulphuric acid (Luszczkiewicz and Chmielewski, 2006) Leaching of the flotation feed with H 2SO 4 reduces the size of particles due to lib-

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Mining and Extraction: Oxide Ores - processes for extracting ...

Extraction of sulfide ores is covered in more detail in Copper Mining and Extraction: Sulfide Ores (1114), but is introduced here because an important by-product of this process is used for the extraction of oxide ores. Pyroprocessing Sulfide Ores Provides Acid for Leaching. The process used to treat sulfide copper ores begins at the mine ...

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Improvements in gold ore cyanidation by pre-oxidation with ...

Usually the kind of gold ores containing sulphidic minerals depending on the sulphide content and mineralogy can be pre-treated by oxidation steps prior to cyanidation, converting the sulphides to oxides or sulphates, in some cases enhancing the opening up of the ore. Experts in the field propose that pre-oxidation is used for two reasons: (i) to oxidize and breakdown sulphide minerals to expose encapsulated gold; and (ii) to passivate the sulphide minerals by oxidizing the surface ...

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pretreatment of refractory ores in gold leaching process congo

Processing technologies for gold-telluride ores | SpringerLink. This study deals with provided that gold is coarse enough to the alkaline sulfide leaching as an Gold ores are commonly classi- be physically and economically liber- alternative pretreatment method fied as free-milling and refractory for antimonial refractory gold and ated. ores based on the metallurgical per- silver bearing ores.

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Sulfide Ore Processing « TCB Metals and Refining

Processing Sulfide Ores Historically, miners have shipped their sulfide concentrates to overseas smelters that have little to no regulations or emissions controls. However, with the implementation of the Mercury Export Ban of 2008 and the high costs of installing equipment to prepare sulfide ores for cyanide leaching, many companies are ...

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