the effect of the iron minerals in ores on oxidation of
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the effect of the iron minerals in ores on oxidation of

The effect of the iron minerals in ores on oxidation of ...

高达10%返现  The effect of the iron minerals in ores on oxidation of uranium in acid. G. M. Alkhazashvili, G. M. Nesmeyanova L. N. Kuz'mina Soviet Atomic Energy volume 15, pages 1031–1035 (1963)Cite this article

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Oxidative potential (OP) and mineralogy of iron ore ...

Oxidative potential (OP) and mineralogy of iron ore particulate matter at the Gol-E-Gohar Mining and Industrial Facility (Iran) Environ Geochem Health . 2018 Oct;40(5):1785-1802. doi:

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The effect of heavy oxidation upon flotation and potential ...

May 01, 2006  The oxidation of iron bearing sulfides, such as those found in Merensky type ores, in the presence of either air or air and water precede through a similar mechanism with the preferential loss of iron and subsequent sulfur enrichment of the underlying mineral lattice (Buckley and Woods, 1987, Smart et al., 2003).

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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite

sulfide ores and was used commercially for treating a cobalt-nickel arsenic ore (14). Alkaline pressure oxidation was also used to treat high-acid-consuming mercury gold ore (15). Alkaline pressure oxidation yields a residue composed primarily of iron oxide, which is environmentally safe and compatible with the cyanidation process.

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Ferrous Iron Oxidation - an overview ScienceDirect Topics

The oxidation of elemental sulfur generated to sulfuric acid is critical since the former is deposited on the surface of minerals, creating a passivation effect that prevents the microorganisms from further attacking the metal sulfides present in the ores.

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Some factors that affect beneficiation of sulphide nickel ...

Jun 01, 2007  Ores can be ground autogenously without grinding media in rubber lined mills or with metallic grinding media in steel mills. Therefore, oxidation and the surface properties of sulphides may be different. Process iron can prevent the oxidation of sulphide minerals in many ways. Oxidation makes the slurry more reductive.

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Recrystallization of Fe O During the Induration of Iron ...

Recrystallization of Fe 2 O 3 During the Induration of Iron Ore Oxidation Pellets 331 the dry balls were put into a corundum crucible and pushed into the preheating zone of the furnace step by step, preheated at the given temperature for a given period.

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The effect of surface oxidation of copper sulfide minerals ...

Dec 01, 2011  The industry is well aware of the difficulty in treating copper ores in the presence of clay minerals. In this study, the effect of bentonite on the flotation of chalcopyrite (a primary copper sulfide mineral) and chalcocite (a secondary copper sulfide mineral)

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The effects of ferrous iron, dissolved oxygen, and inert ...

The effects of suspended, inert solids concentration, ferrous iron concentration and dissolved oxygen concentration on the kinetics of iron oxidation by Thiobucillus ferrooxidans are reported. It is shown that the maximum specific growth rate for this organism, oxidizing ferrous iron, is of the order of 0.1 h −1 .

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Effects of dissolved oxygen on the biooxidation process of ...

Nov 01, 2012  Effects of DO on the mineral oxidation The concentration of Fe 2+ and Fe 3+ in solution, the ores oxidation ratio and the biooxidation rate during the biooxidation process at various DO concentrations are shown in Fig. 1 .

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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite

sulfide ores and was used commercially for treating a cobalt-nickel arsenic ore (14). Alkaline pressure oxidation was also used to treat high-acid-consuming mercury gold ore (15). Alkaline pressure oxidation yields a residue composed primarily of iron oxide, which is environmentally safe and compatible with the cyanidation process.

Read More
Recrystallization of Fe O During the Induration of Iron ...

Recrystallization of Fe 2 O 3 During the Induration of Iron Ore Oxidation Pellets 331 the dry balls were put into a corundum crucible and pushed into the preheating zone of the furnace step by step, preheated at the given temperature for a given period.

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The Enhancing Effect of Pyrite on the Kinetics of Ferrous ...

the enhancing effect of pyrite on the kinetics of ferrous iron oxidation by dissolved oxygen by patrick oliver leahy littlejohn b.a.sc., the university of british columbia, 2006

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Effect of Dissolved Oxygen on Pre-Oxidation and ...

Jan 01, 2017  This impeding effect can be alleviated by leaching at low pH or adding lead salt. Using oxygen and lead together can make synergistic effect in oxidation of sulfide minerals and can enhance gold extraction. Depending on the mineralogical characteristics of the ore, the optimum DO and lead concentrations can be optimized.

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

fide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. Pyrometallurgical oxidation by roasting is encountered with environmen-tal limitations; thus hydrometallurgical methods are preferred. These methods include pressure oxidation (Long and Dixon, 2004), bio–oxidation (Hansford and Chapman,

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

Pressure oxidation typically operates at moderate temperature and pressure, temperatures of 60˚C to 80˚C and an oxygen pressure of 60 to 80 psi. Under these con- ditions, the sulfide sulfur is oxidized to sulfate. 1.2. Alkaline Oxidation . Arsenopyrite has an economic importance, when there is more of it than gold in the ore. Oxidation of ...

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Oxidative Hydrometallurgy of Sulphide Minerals

The oxidation of sulfide ores by ozone can occur by dissolution of sulfide species and the formation sulfate ion, as suggested by Elorza et al. Then, the global reaction of the pyrite

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Minerals Free Full-Text Mechanism for the Bio ...

This work investigated the effects of Fe3+, H+ and adsorbed leaching bacteria on the bioleaching of pentlandite. Collectively, an integrated model for the oxidation and decomposition of pentlandite was built to describe the behaviors of different components in a bioleaching system. Proton ions and ferric ions could promote the break and oxidation of Ni-S and Fe-S bonds. The iron-oxidizing ...

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Ore Deposits Formed by Oxidation and Supergene Enrichment ...

The effects oxidation may, however, _____ far below the one of oxidation. metallic content As the cold, dilute, leaching solutions trickle downwards, they may lose a part or all of their _____ within the zone of oxidation to give rise to oxidized ore deposits.

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Effect of iron minerals on cyanide leaching_Henan KaiLide ...

Iron sulfide minerals have active chemical properties and can react with cyanide solution and the oxidation products of iron sulfide minerals can also react with cyanide solution. Pyrite, marcasite and pyrrhotite are common minerals in gold ores.

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The Effect of Hydrogen Peroxide on Leach Dump Bacteria

Dec 27, 2018  The addition of H2O2 is intended to accelerate the oxidation of iron and reduced minerals and not necessarily to replace existing bacterial activity. The purpose of this study is to examine the effect of on the activity of T. thiooxidans and T. ferrooxidans and investigate methods of reducing observed detrimental effects. Experimental The Organisms

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Sulfide Mining and Human Health - Save the Boundary

iron ore (taconite or ferrous) mining because it has the potential to generate acidic pH. Copper and nickel typically are bound to sulfur in rock. Because of this sulfur bond, they are described as sulfide minerals.3 The chief iron-bearing minerals in iron mining are iron oxides and iron carbonate,4 neither of which are sulfide minerals.

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Effect of magnetite on mineral phase formation in ...

Abstract. Mineral phase formation behavior in the sintering process is one of the most important factors for quality and productivity of iron ore sinter. As resource of high-grade hematite ore is exhausting, it is expected that hematite ore can replaced by magnetite in iron-making. So that, the purpose of this study is to investigate the effect ...

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Effects of Iron Ores on the Combustion Behavior of Coke ...

ing iron ore sintering process, which was called fuel NOx. NO was the majority of the fuel NOx, accounting for about 95%.5,6) CO and NO formed simultaneously during the solid fuel combustion process, and Hida 7–9) found that the et al. Effects of Iron Ores on the Combustion Behavior of Coke and NOx Emission during Sintering Process

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Iron ore - Wikipedia

Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the form of magnetite (Fe 3 O 4, 72.4% Fe), hematite (Fe 2 O 3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe), limonite (FeO(OH)n(H 2 O), 55% Fe) or siderite (FeCO ...

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

fide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. Pyrometallurgical oxidation by roasting is encountered with environmen-tal limitations; thus hydrometallurgical methods are preferred. These methods include pressure oxidation (Long and Dixon, 2004), bio–oxidation (Hansford and Chapman,

Read More
Oxidative Hydrometallurgy of Sulphide Minerals

The oxidation of sulfide ores by ozone can occur by dissolution of sulfide species and the formation sulfate ion, as suggested by Elorza et al. Then, the global reaction of the pyrite

Read More
Ore deposits formed by oxidation and supergene enrichment

Ore Deposits Formed by Oxidation and Supergene Enrichment When ore deposits are exposed to the oxidation zone they are weathered and altered with the country rocks. The surface waters oxidize many ore minerals and yield solvents that dissolve other minerals. An orebody thus becomes oxidized and generally leached of many of its valuable materials down to the groundwater table, or to ...

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Effect of Sodium Chloride on Ferrous Iron Oxidation and ...

Biomining is the utilization of acidophilic iron- and/or sulfur-oxidizing microorganisms for metal extraction from low-grade sulfide ores and mineral concentrates. This microbial process of metal recovery has been proven to be a cost-effective and sustainable technology. However, acidophilic microorganisms are extremely sensitive to chloride ions present in biomining operations through the ...

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Oxidative Hydrometallurgy of Sulphide Minerals

oxidation of pyrite, one of the most abundant minerals on earth. In general, under oxidant condition and low pH, pyrite oxidation proceeds through two basic steps: In the first step, the dissolution of pyrite to ferrous ions in an acid medium proceeds through the formation of an iron-deficient or a sulfur-rich layer rather than elemental sulfur.

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WO2004083468A1 - Method for preventing oxidation of ...

A method for suppressing the oxidation of sulfide minerals in a sulfide ore, which comprises adding an antioxidant containing an organic acid having a carboxyl group as a primary component and also containing a vegetable polyphenol to the sulfide ore accumulated in a stock pile or an accumulation spot for waste stones. The method allows the suppression of the oxidation of sulfide minerals in a ...

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IRON ORE1 - USGS

IRON ORE. 1 (Data in thousand metric tons, usable ore, unless otherwise noted) Domestic Production and Use: In 2020, mines in Michigan and Minnesota shipped 98% of the usable iron ore products, which were consumed in the steel industry in the United States with an estimated value of $4.1 billion, a decrease from $4.4 billion in 2019.

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Gold Metallurgy Leaching in Cyanicides

Jul 14, 2016  Optimize Gold Leaching Recovery with Chromium Minerals. Lead Chromite (PbCrO4)5. Cyanidation as applied to ordinary gold and silver ores is a relatively simple process. When cyanicides {cyanide-consuming elements) are encountered in small amounts in the treatment of such ores, the various schemes already discussed, such as use of a lead salt ...

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Thermodynamic Modelling of Iron Ore Sintering Reactions

Silico-ferrite of calcium and aluminum (SFCA) is one of the most commonly-produced phases in fluxed iron-ore sintering, and has long been regarded as an important bonding phase in industrial sinters. It is thus considered to have a significant effect on sinter quality. In this study, a solid solution model and database has been developed for the SFCA phase, and has been incorporated into the ...

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Mineralogy: magnetite hematite – minerals of the week #2 ...

Feb 28, 2011  The first mineral on our tour was quartz. Most weeks, we’ll only cover one mineral, but there was a very strong push to include magnetite hematite when I polled the blogosphere, so I chose to add both. Both magnetite (Fe3O4) hematite (Fe2O3) are iron oxides. However, the oxidation state of iron (Fe) is not the same for both minerals.

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Effect of iron(II) and manganese(II) on oxidation and co ...

Thompson, G. and Senanayake, G. (2018) Effect of iron(II) and manganese(II) on oxidation and co-precipitation of cobalt(II) in ammonia/ammonium carbonate solutions during aeration - An update and insight to cobalt losses in the Caron process for laterite ores. Hydrometallurgy, 181 . pp. 53-63.

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

Pressure oxidation typically operates at moderate temperature and pressure, temperatures of 60˚C to 80˚C and an oxygen pressure of 60 to 80 psi. Under these con- ditions, the sulfide sulfur is oxidized to sulfate. 1.2. Alkaline Oxidation . Arsenopyrite has an economic importance, when there is more of it than gold in the ore. Oxidation of ...

Read More
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