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sulfide mineral oxidation in freshly processed tailings

High Temperature Oxidation (Heating) of Sulfidic Paste Backfill: A ...

through oxidation. The progression of sulfide (pyrite) oxidation and the neutralization of the acid produced from the unaltered to the more oxidized paste samples (yellow) to the red specimens is strongly evidenced by the compositional changes in paste pH, Fesulfides and S 2-, SO 4, and CO2 (Tables 1 to 3). Table 1. Mine A fresh and oxidized ...

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Sulfide mineral oxidation in freshly processed tailings : batch experiments

Tailings consist mostly of different silicates but also sulfides (e.g. pyrite), since 100 % metal recovery is not possible. Freshly processed tailings are deposited in large impoundments. If the mine tailings in the impoundments are exposed to water and oxygen, the sulfides will oxidize and release acidity and metals such as Fe, Cu, Zn, and Pb.

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Controls of H2S, Fe2 +, and Mn2 + on Microbial NO3--Reducing Processes ...

In contrast, the importance of H 2 S as a direct substrate for both denitrification and DNRA is well established (Table 1).In organic-rich lake sediments, sulfate is efficiently reduced to sulfide (Holmer and Storkholm, 2001), which reacts with iron species to sulfur intermediates or FeS (Zopfi et al., 2004).Some nitrate reducers can use both dissolved and particulate forms of reduced sulfur ...

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Sustainability | Free Full-Text | Exploring the Potential for ... - MDPI

Medium and highly sulfidic tailings are high-volume wastes that can lead to severe environmental damage if not properly managed. Due to the high content of sulfide minerals, these tailings can undergo weathering if put in contact with oxygen and water, generating acid mine drainage (AMD).

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DRA-27a. CEMENTATION IN THE QUESTA ROCK PILES - New Mexico Bureau of ...

Weathering or oxidation of pyrite and other sulfide minerals generally requires four components: water, sulfur (sulfide), air (oxygen) and bacteria (McLemore, 2008b) and the result is sulfuric acid, locally called acid drainage (AD), acid mine drainage (AMD), or acid rock drainage (ARD).

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Tailingsfo Backfill of Tailings to Underground Workings

Tailings can be stored below ground in previous worked out voids. The tailings are generally mixed with a binder, usually cement, and then pumped underground to fill voids and help support an underground mine. For example a 'room and pillar' mining operation that uses backfill will be able to extract the insitu pillars containing ore.

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Case Studies Chapter 6 - GARDGuide

The field experiment proved that the technique can effectively limit the transport of sulphide mineral oxidation products in mine tailings impoundments. The experiment reported that the amendments containing a large proportion of labile organic carbon compounds should be used sparingly, as rapid development of reducing conditions can lead to ...

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Iron Control in Zinc Pressure Leach Processes - The Minerals, Metals ...

The zinc pressure leach process depends upon the following simple reactions in which zinc sulfide, pyrrhotite, or iron in sphalerite, galena, and chalcopyrite react with sulfuric acid and oxygen to produce metal sulfates and elemental sulfur. ZnS + H 2 SO 4 + 0.5O 2 —> ZnSO 4 + H 2 O + S°. FeS + H 2 SO 4 + 0.5O 2 —> FeSO 4 + H 2 O + S°.

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Pilot-scale feasibility study for the stabilization of coal tailings ...

Depending on the type of ore-body and associated mineralogy of the surrounding parent rock, tailings may comprise sulfide-bearing minerals, such as pyrite (FeS 2), which can undergo a series of chemically and microbiologically catalyzed oxidation reactions in the presence of air and water to form ferric iron (Fe 3+), acidic protons, and sulfate ...

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Role of calcium and magnesium cations in the interactions between ...

flotation of sulfide minerals (Bruckard et al., 2011). It is because of this reason that the use of freshly ground ore samples is recommended when working with sulfides. In this work the objective was to study the effect of clay minerals on the flotation of pure chalcopyrite, using 0.01M NaCl solutions and seawater. In our tests the samples were

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Geochemical and mineralogical aspects of sulfide mine tailings

Tailings generated during processing of sulfide ores represent a substantial risk to water resources. The oxidation of sulfide minerals within tailings deposits can generate low-quality water containing elevated concentrations of SO 4, Fe, and associated metal(loid)s. Acid generated during the oxidation of pyrite [FeS 2], pyrrhotite [Fe

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Microbial methylation potential of mercury sulfide particles ... - Nature

Mercury sulfide nanoparticles remained bioavailable for methylation during the entire ageing period in this research (0-21 days), and the methylation potential of nanoparticulate mercury was ...

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CLIMATE CHANGE HEALTH Sulfide-ore mining AND human health in Minnesota

mineral oxidation that occurs as part of the sulfide-ore mining process, leaching of sulfate and toxic metals from mine ore and waste rock will continue for centuries. Sulfate and toxic metals will inevitably make their way into surrounding water, soil, fish, birds and mammals, increasing the already existing toxic burden. Threats to fresh ...

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CORE

Tailings consist mostly of different silicates but also sulfides (e.g. pyrite), since 100 % metal recovery is not possible. Freshly processed tailings are deposited in large impoundments. If the mine tailings in the impoundments are exposed to water and oxygen, the sulfides will oxidize and release acidity and metals such as Fe, Cu, Zn, and Pb.

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ACS Symposium Series (ACS Publications) - American Chemical Society

SOLUBILITY AND SORPTION CONTROL IN FORMATION OF SULFIDE-OXIDATION PRODUCTS Influence of Siderite on the Pore-Water Chemistry of Inactive Mine-Tailings Impoundments C. J. Ptacek David W. Blowes Chapter 13, 172-189 DOI: 10.1021/bk-1994-0550.ch013 Publication Date (Print):December 20, 1993 Abstract PDF ABSTRACT

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Geochemical and mineralogical aspects of sulfide mine tailings - CORE

Tailings generated during processing of sulfide ores represent a substantial risk to water resources. The oxidation of sulfide minerals within tailings deposits can generate low-quality water containing elevated concentrations of SO 4, Fe, and associated metal(loid)s. Acid generated during the oxidation of pyrite [FeS 2 ], pyrrhotite [Fe (1-x)

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Sulfide mineral oxidation in freshly processed tailings: batch ...

With these initial conditions in consideration, the aim of this laboratory study was to investigate the abiotic and microbial sulfide oxidation rates in freshly processed pyrite-rich tailings. These tailings originated from 1.9 Ga old stratiform Zn-Cu ores in the Skellefte district sulfide ore field ( Skelleftefältet, 65°N 20°E) in northern Sweden.

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Simulation of pyrite oxidation in fresh mine tailings under near ...

It could be concluded that the near-neutral pH in the tailings has no decreasing effect on the rate of sulphide oxidation, but does reduce the concentrations of dissolved elements in the drainage water due to the formation of secondary minerals. This means that sulphide oxidation rates may be underestimated if determined from drainage alone.

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Nuorivaara, Ted; Björkqvist, Anna; Bacher, John; Serna-Guerrero ...

For this purpose activators and collectors are necessary. Activator adsorption on sulfide minerals and the subsequent xanthate adsorption to the activated mineral surface have been extensively studied [16-20]. With respect to tailings desulfurization, the most common approach is the activation of pyrite with Cu following two subsequent steps [20]:

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Acid production potentials of massive sulfide minerals and lead-zinc ...

Acid drainage is considered as one of the most significant environmental problems associated with the mining industry (Johnson & Hallberg 2005; Pérez-Ostalé et al. 2016).This highly contaminating drainage containing hydrogen, sulfate and metal ions may form and become excessive due to microorganism-catalyzed oxidation as a result of water and air exposure to massive sulfide minerals and ...

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Gold and Silver - Us Epa

corrosive nature of the oxidizing agent. Bio-oxidation of sulfide ores employs bacteria to oxidize the sulfur-bearing minerals. This technique is currently used on an experimental basis at the Homestake Tonkin Springs property in Nevada. Roasting of sulfide ores involves heating the ores in air to convert them to oxide ores and break up their

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Using Chromium Reducible Sulfur to Predict Acid Formation Potential

Sulfide minerals, such as pyrite, undergo oxidation by reaction with ... notably coal and deep sulfide intrusions into fresh rock, do contain most of the total sulfur as sulfide minerals (especially pyrite), others do not. ... Number of Samples Sample Type Mine/Mineral Type 5 Process tailings Nickel -copper 6 Tailings Gold 10 Waste rock Iron 6 ...

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Processes of metastable-mineral formation in oxidation zones and mine ...

Introduction. Oxidation zones and mine wastes are critical zones of ore deposits, either in situ or after human-driven re-deposition, respectively. The critical zone is a near-surface environment, a thin layer connecting atmosphere and geosphere (Küsel et al., Reference Küsel, Totsche, Trumbore, Lehmann, Steinhäuser and Herrmann 2016).Within the critical zone, metal cycling, mineral ...

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Geochemical Assessment of Potential Waste Rock and Tailings

The Master Composite tailings sample has an EC of 308 µS/cm. Consistent with fresh waste rock, tailings are expected to generate low-salinity contact water (run-off and seepage). Due to the moderate to high total S (and sulfide) concentration, the potential for sulfate-derived salinity (from sulfide oxidation) is moderate to high.

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Thermoacidophilic bacteria isolated from Sarcheshmeh low-grade copper ...

through biological oxidation by microorganisms [3, 4]. The materials remaining in the process of isolating valuable parts from non-valuable components are called tailing [5]. Over time, mineral resources will be finished and mineral tailings, of which the main part is a low-grade copper ore, acquire value.

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Process for Recovering Gold and Silver From Refractory Ores

The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates. Inventors: Hillier, Daniel (Oakville, CA) Gorain, Barun (Toronto, CA) Mcmullen, Jacques (Oakville, CA) Application Number: 12/208968 Publication Date:

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Current Situation on Flotation of Cu-Pb-Zn Sulfide Ore - Atlantis Press

For a sulfide ore with high oxidation degree and fine particle disseminated, the partial preferential flotation process was adopted[4]. Namely, the copper and lead bulk concentrate was selected firstly and got separated. Then the zinc concentrate was obtained from the flotation tailings. Some better process indicators were acquired.

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Microbial Oxidation of Sulfide Tailings and the Environmental ...

An important source of heavy metal contamination, sulfide tailings are usually disposed of in open-air impoundments and thus are exposed to microbial oxidation. Microbial activities greatly enhance sulfide oxidation and result in the release of heavy metals and the precipitation of iron (oxy)hydroxides and sulfates.

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Heavy metal release and acid generation during the oxidation of sulfide ...

The sulfide minerals in the waste rock produce H + during the oxidation process, where massive amounts of heavy metals are released from the waste rock along with the production of acid. The process is influenced by various factors, among which the role of oxidizing agents should not be underestimated. (Carl and Janet, 1991).

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Surficial weathering of iron sulfide mine tailings under semi-arid climate

formation whose rate is of similar magnitude to the naturally-occurring fresh rock reveal rate and the top soil loss rate (ca. 21 Gt/yr; Wilkinson and McElroy, 2007; Lottermosser, 2010). 1.1. Weathering of sulfide tailings Tailings weathering begins with the oxidative dissolution of pyrite-rich wastes and the

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Solid-phase products of bacterial oxidation of arsenical pyrite ...

The U.S. Department of Energy's Office of Scientific and Technical Information

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Keweenaw Bay Indian Community - USGS

What are sulfide minerals? Metallic sulfide minerals - minerals formed by the chemical combination of metals and sulfur within an intrusive magma Metallic sulfide minerals, when exposed to oxygen/air and moisture, form sulfuric acid and dissolved metals -basically when metal sulfides are subjected to oxidizing conditions

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Chapter 1 INTRODUCTION - University of Pretoria

Pyrrhotite is known to be a reactive mineral which is highly prone to oxidation (Rand, 1977; Belzile et al., 2004). The downstream consequences of this during minerals beneficiation may be quite severe, an example of which is the Nickel Rim site in Sudbury described by Johnson et al. (2000). The Nickel Rim site is actively suffering from the ...

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Mineralogical, Geochemical and Isotopic Study of The Active Tailings ...

Incipient pyrite alteration was observed at the surface already two weeks after deposition; pyrite grains also in the youngest layers showed small oxidation rims. This process seemed to lower the pH at the surface of the tailings impoundment. New tailings deposition renewed in a 4-weeks rhythm the alkaline conditions at the surface.

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Summary of Stibnite Gold Project Geochemical Characterization Program ...

laboratories. The general process separates sulfide minerals from the crushed ore generating a sulfide concentrate and a gangue mineral flotation tailing. The sulfide concentrate goes through a pressure oxidation (POX) vessel to oxidize the sulfides and then sent to ais cyanidation circuit to extract the gold

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Short Term Sulfate Release Rates and Sulfide Oxidation Mechanisms for ...

During the experiment, Mg-rich carbonates neutralized any acid that was generated by the oxidation of sulfide minerals in the tailings which caused the pH of the rinse waters to remain alkaline over the ten to twelve week experimental period. Both Mg and alkalinity increased with increasing SO 4

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IMPC 2014 - Gecamin Digital Publications

Online proceedings. Welcome to IMPC 2014 online articles. This publication contains a selection of articles carefully reviewed by a technical committee composed of experts from the field. You can directly access the articles in this publication using the search box on the left.

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Pyrite oxidization accelerates bacterial carbon sequestration in copper ...

Polymetallic mine tailings contain sulfide minerals (e.g., pyrite), and the oxidation of these sulfide minerals leads to 45 a decrease in pH, also known as mine tailing acidification. With decreased pH, the relative abundances of the Euryarchaeota and Actinobacteria phyla were found to significantly increase (Chen et al., 2013;Liu et al., 2014).

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Minerals | Free Full-Text | Desulfurization of the Old Tailings at the ...

Environmental desulfurization of tailings is one technology that has gained popularity in the last two decades. This method consists of separating sulfide minerals from mine tailings using froth flotation. The resulting desulfurized fraction can be managed separately [ 29, 30] or backfilled in underground mines [ 31 ].

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Acid Mine Drainage (AMD) and its control by Partha D Sharma -

Conditions for microbial oxidation - The important requirements in the microbial oxidation of sulphide minerals are (i) an energy source and (ii) adequate supply of O2, CO2 and essential nutrients....

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