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Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery. The fine coating of a iron compound definitely appears to be a key component of the inability of cyanide to efficiently leach low grade pyritic ores.
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Copper ore is classified into three groups; primary copper sulfide, copper oxide and secondary copper sulfide. Leaching copper from primary copper sulfide, such as chalcopyrite, with sulfuric acid takes longer time than from copper oxide and secondary copper sulfide. As such, an oxidant is required to extract copper from chalcopyrite. In this study, column leaching tests were carried out using ...
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The commonly reported leach reaction of a sulfide mineral with nitric acid in conjunction with sulfuric acid is shown below. 3MeS (s)+ 2HNO3 (aq) + 3H2SO4 (aq) Æ 3MeSO4 + 3S° (s) + 2NO (g) + 4H2O (1) However, it is postulated that the actual reaction species is NO+ and not NO3- (47,50).
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Sulphide copper minerals chalcocite, covellite and chalcopyrite, which are mostly present in sulphide ores of copper, can be leached only in the presence of oxidants, or with the help of bacteria from the genus Acidithiobacillus(formerly Thiobacillus), which are isolated from mine water. They were later identified as
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Yet there is a growing case for leaching sulfides from lower grade ore bodies and especially for those ore bodies containing problematic elements like arsenic, which make smelting less economical. Smelting is increasingly expensive because, in general, smelters require a content of more than 25 per cent copper.
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The sulfide ore minerals including chalcopyrite (CuFeS 2 ), sphalerite (ZnS), galena (PbS) provide the major sources of the world's base metals (Cu, Zn, Pb, respectively), whereas pyrite is virtually ubiquitous as a metalliferous mineral in sulfide ore deposits (Crang and Vanghan, 1994).
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Sulfide mining (also known as metallic mining) refers to mining operations which remove metals, such as copper, nickel, platinum and others, from sulfur bearing ores. ... spent ore as waste product. 26 Vat leaching uses a series of enclosed tanks rather than an exposed heap. Vat leaching allows for greater recovery of metals, but is more costly ...
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This can be done by giving the sulphide ore an oxidizing-sulphatizing roast. Copper sulphate is soluble in water, so acid will be saved in the leaching process if copper sulphate is present. From assays of the pregnant liquor the percentage extractions of the copper present in the calcine were calculated.
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chalcocite. Together with dump leaching of mine waste, heap leaching contributes about 20% of annual world copper production (Watling, 2006). The leaching of several low-grade nickel sulfide ores has also been investigated in pilot-scale heaps (Watling, 2008), including test heaps at Radio Hill, Western Australia and at Talvivaara, Finland.
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Which of the following are sulphide ores? Therefore copper pyrites is a sulphide ore.. Which of the sulphide ores Cannot be successfully concentrated by flotation process? Galena (PbS), sphalerite (Zn,Fe)S, chalococite (Cu2S) Althrough argentite (Ag2S) is a sulphide ore, it is not concentrated by froth flotation process since its silver content is low. It is better concentrated by leaching ...
Get priceAcid leaching (e.g. sulfide ore) Chemistry [ edit] Leaching is done in long pressure vessels which are cylindrical (horizontal or vertical) or of horizontal tube form known as autoclaves. A good example of the autoclave leach process can also be found in the metallurgy of zinc. It is best described by the following chemical reaction:
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Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery. The fine coating of a iron compound definitely appears to be a key component of the inability of cyanide to efficiently leach low grade pyritic ores. Perhaps there is some room here for a pretreatment, to ...
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The present invention discloses a new process for leaching sulfide minerals consisting of leaching crushed ore in a vat reactor, wherein the leaching solution is fed with an ORP value close to the upper limit suitable for leaching and the exiting leaching solution leaves the reactor with an ORP above the lower limit suitable for leaching the ore.
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A method for leaching one or more target metals from a sulfide ore and/or concentrate containing such, the method comprising the steps of: (a) Exposing the ore and/or concentrate to an aqueous solution of chlorine-based oxidising species in which the hypochlorous acid comprises at least 10 mol % of the chlorine-based oxidising species; (b) Allowing and/or facilitating the oxidation of the ...
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SummaryMicrobiological leaching of complex sulfide ore material was evaluated in percolators at 4, 10, and 20°C. The onset of leaching was associated with an increase in redox potential and a decrease in pH. Copper from chalcopyrite was leached at a slow rate at each test temperature compared with the leaching of zinc from sphalerite and nickel from pentlandite.
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Abstract The purpose of the work was to quantitatively characterize temperature effects on the bacterial leaching of sulfide ore material containing several sulfide minerals. The leaching was tested at eight different temperatures in the range of 4 of 37C.
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The leaching behavior of minerals from a pyrrhotite-rich pentlandite ore during heap leach- ing. Elsevier. Minerals Engineering, volume 119, pp. 116-125. DOI: 10.1016/j.mineng.2018.01.025 View at Publisher [Publication 3]: Arpalahti, Antti; Lundstrom, Mari. 2019. Dual aeration tests with heap leaching of a pyrrhotite-rich pentlandite ore. Elsevier.
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Abstract The evolution of microbial populations involved in simulated‐heap leaching of a polymetallic black schist sulfide ore (from the recently‐commissioned Talvivaara mine, Finland) was monitored in aerated packed bed column reactors over a period of 40 weeks.
Get priceBiological sulfur oxidation is the most commonly used process in the heap leaching of copper sulfides. Ore is agglomerated (fine particles attached to larger ones with concentrated H2SO4 solution)...
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The mineralogy of the ore and leached residues was examined to assist with results interpretation. 2. Materials and Methods 2.1. Copper-nickel sulfide ore 5The mixed sulfide ore consisted of a mainly silicate matrix (~80-90%), with pyrrhotite (Fe1-xS, where x varies from 0 to 0.125), chalcopyrite (CuFeS2) and pentlandite ( (Fe,Ni)9S8).
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The self-heating of sulfide ores is an unsteady process with positive persistence and obvious mutation, so the possibility of self-heating of sulfide ores can be determined according to the change characteristics of Hurst index. ... "Experimental and theoretical study on strengthening leaching of sulfide ores by surfactants," Transactions ...
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Biochemical leaching is now a well-established commercial process for treating gold ores in which the gold is enclosed within sulfide minerals. Biochemical oxidation of the sulfide minerals releases the gold and allows it to be leached by the chemicals used in conventional gold leaching.
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SX-EW, or the Solvent Extraction - Electrowinning approach to lateritic ore beneficiation, is a hydrometallurgical method that relies on leaching, extractants, and electrowinning to produce nickel from ore. This process is often referred to as Leach Solvent Extraction - Electrowinning for its employment of a leaching step.
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Dump leaching enables maximum recovery of valuable metal from any ore, but makes possible exploitation of very low grade Cu and U ores. Continuous extraction processes are possible where a continuously growing bacterial culture is fed with pyritic ores (or FeSO 4 or other sulphide) and continuous metal solubilization proceeds.
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Thiobacillus and Leptospirillum are characterized by the oxidation of sulphide minerals in acidic environment and temperature values less than 35°C, with regard to area of application these two are mostly used in dump and tank leaching of metal from sulphide based mixed ores [20, 21]. The other group of genus Sulphobacillus used under the same ...
Get pricesulphide ore [15, 16, 17]. The hydrometallurgical extraction by leaching involves the use of HF, HCl and H 2SO 4 to win the metal into solution from which they can be profitably recovered. The paper presents laboratory report on leach study of a particular ZnS ore using a range of concentrated acid. The authors carried out this work as prelude
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A low grade sulphide ore leaching could be contemplated using an oxidative / bacterial heap leach. Another option is to concentrate the sulphides using flotation, then atmospheric or pressure...
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Flotation-roasting-cyanidation leaching process for high-sulfide gold ore The symbiotic relationship between gold and sulfide in high-sulfide gold ore is close, and most of the gold is wrapped in sulfide, so the gold recovery rate of direct leaching will be extremely low.
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a method for leaching one or more target metals from a sulfide ore and/or concentrate containing such, the method comprising the steps of: (a) exposing the ore and/or concentrate to an aqueous solution of chlorine-based oxidising species in which the hypochlorous acid comprises at least 10 mol % of the chlorine-based oxidising species; (b) .
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Approximately 94% of the total ore will be processed via oxidation and heap leach, with the remainder being processed via traditional heap leach (with no pre-oxidation). Most oxide and transitional...
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gations into the leaching of nickel sulfide flotation concen-trates at ambient pressure are reviewed in Part III of this series. The processing of whole nickel sulfide ores is not the subject of this review and bioleaching of whole Ni and Cu- Ni sulfide ores has been previously covered by Watling (2008).
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Finally, after 200 days, the ore completes the leaching cycle and allows the company to obtain recoveries of 70% copper or more. Alan Muchnik, VP Strategy & Innovation for Antofagasta Asked if the company is eyeing even higher recoveries that can compete with the levels Cuprochlor is achieving on secondary sulphides, Muchnik said it was all ...
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The present invention is a method of leaching copper from a copper sulfide ore by a process of leaching a layer of stacked ores, wherein the leaching solution containing Fe (III) ion and other...
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Copper, zinc, gold, etc. can be recovered from sulfide ores by microbial leaching. Mineral solubilization is achieved both by 'direct (contact) leaching' by bacteria and by 'indirect leaching' by ferric iron (Fe(3+)) that is regenerated from ferrous iron (Fe(2+)) by bacterial oxidation. Thiobacillus ferrooxidans is the most studied organism in ...
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Rosenbaum, J B, and McKinney, W A. IN SITU RECOVERY OF COPPER FROM SULFIDE ORE BODIES FOLLOWING NUCLEAR FRACTURING.. Country unknown/Code not available: N. p., 1970. Country unknown/Code not available: N. p., 1970.
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The material used for leaching was lean finely-disseminated, copper-nickel ore difficult to enrich with a nickel content of 0.32%, including sulfide of 0.26%, copper 0.11%, whose mineral composition is represented by pentlandite (0.8%), chalcopyrite (0.3%), pyrrhotite (5.8%), and silicates.
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NORTH AMERICA. In North America, FCX operates seven open-pit copper mines — Morenci, Bagdad, Safford, Sierrita and Miami in Arizona, and Chino and Tyrone in New Mexico; and two molybdenum mines — Henderson and Climax in Colorado. Molybdenum concentrate, gold and silver are also produced by certain of FCX's North America copper mines. FCX ...
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Biologically Assisted Copper Secondary Sulfide Ore Leaching in the Presence of Chloride Abstract: Mining operations today face a difficult challenge in terms of water availability, with most of these deposits located in arid areas where fresh water is scarce.
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the gold. This work studies a method of removing problematic components in an ore that can occlude gold from leaching solution, thereby hindering gold extraction. Specifically, the method studied uses forced aeration in a slurry under high pH, ambient pressure conditions to oxidize iron-sulphide-containing gold ores taken from a mine in China.
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Jun 2, 2022Leaching is the separation of the ore or the metal from other impurities by treating the former with a suitable reagent. Bauxite is an oxide ore of Aluminium that is found in the earth's crust. There are mainly three ways of leaching Bauxite:- Hall's process, Baeyer's process and Serpek's process.
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