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oxidation of sulfide minerals benefiion processes
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Sulfidic Mine Wastes
Selective oxidation of sulfide minerals occurs as one sulfide mineral is preferentially leached over another (Abraitis et al. 2004; Evangelou 1995; Evangelou and Zhang 1995; Hita et al. 2006; Kwong et al. 2003; Liu et al. 2008b; Nordstrom and Alpers 1999a; You et al. 2007). This galvanic protection process is the same as that for …
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Application of natural mineral materials in advanced oxidation
Owing to the cycle of metal redox pairs mediated by S species, the iron sulfide minerals present more superior catalytic activity than iron oxide minerals towards H 2 O 2, ... To improve the efficiency of Fenton or Fenton-like oxidation process, photo-Fenton oxidation process introducing ultraviolet or visible light into the reaction system …
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Sulfide Minerals
Reduced sulfur bonds as an anion with a significant range of metals (M) to form sulfide minerals of the general form M a S b, although two or more metals exist in many sulfide minerals.Sulfosalt minerals are a more complex subset of sulfide minerals of the general form M a X b S c, where X is typically one or more of the semimetals (As, …
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Roles, mechanism of action, and potential applications of …
S can exist in different oxidation states, creating various reduced S compounds consisting of elemental S (S 0), sulfite (SO 3 2−), sulfide (S 2−), thiosulfate (S 2 O 3 2−), and tetrathionate (S 4 O 6 2−).SOB can oxidize reduced S compounds using diverse enzymatic systems (Fig. 2), which can be categorized into (1) sulfide oxidation …
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Thermodynamics and Kinetics of Sulfide Oxidation by …
Introduction. The oxidation of hydrogen sulfide is arguably one of the most important processes in the environment as the oceans have been suboxic or anoxic and euxinic (i.e., sulfidic) for long spans of geologic time (Canfield and Raiswell, 1999; Turchyn and Schrag, 2006).These are the oceans in which eukaryotes evolved and sulfur …
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Recovery of gold from sulfide refractory gold ore: Oxidation …
Especially for sulfide refractory gold ores, in order to recover gold, many oxidation pretreatment technologies were proposed including pyrometallurgical and hydrometallurgical processes, and a comprehensive summary of the respective pretreatment technologies is summarized in Table 1. An important feature of these …
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The oxidation of sulphide minerals
Coal pyrolysis desulfurization and the pretreatment of gold-bearing sulfide concentrates always involve the decomposition and oxidation of pyrite, which are complicated processes owing to the large number of …
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Minerals | Free Full-Text | Gold Extraction from a …
Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous pressure …
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Oxidative Hydrometallurgy of Sulphide Minerals
In this Chapter, we will treated the use of ozone and advanced oxidation process, including microwave system, as methods to improve or to help the leaching of different sulphide …
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Sulfide Mineral Oxidation
Sulfide-mineral oxidation is a complex hydrobiogeochemical process involving the oxidation of metal-sulfide minerals, catalyzed by numerous bacterial and archaeal …
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Recovery of gold from sulfide refractory gold ore: Oxidation …
The oxidation processes used for these pretreatments involve biological oxidation, high pressure oxidation, and roasting (Donato et al., 2007; Qin et al., 2021). With the development of the ...
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Electrochemistry of sulfide mineral flotation | Mining, …
The use of various electrochemical techniques to study mechanisms of sulfide mineral-flotation reagent interactions is briefly reviewed in this paper. Prior to such studies it is desirable to thermodynamically determine solution conditions favorable for formation of hydrophobic species deemed to be responsible for flotation. The thermodynamic …
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Full article: The Direct Leaching of Nickel Sulfide Flotation
The CESL process is a medium temperature pressure oxidation process taking place under an oxygen pressure of 1379 kPa (gauge) and temperature above the …
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Pyrite Oxidation Mechanism by Oxygen in …
The mechanism of the initial steps of pyrite (100) surface oxidation was investigated in detail by means of density functional theory/plane-wave calculations. Pyrite oxidation is related to many …
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In situ oxidation of sulfide minerals supports widespread …
The δ 34 S values of dissolved sulfate vary from −5.3‰ to +19.4‰, which are 3.0-26.4‰ higher than those of coexisting sulfide (Table 1).The Δ 33 S of dissolved sulfate vary from −0.40‰ to +0.50‰, which are either identical to or slightly lower (for up to 0.18%) than those of coexisting dissolved sulfide. In contrast, the CAS of the Malmani …
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Roasting of Sulfide Minerals
In addition to common metals like copper, lead, zinc, and nickel, a number of other metals such as antimony, bismuth, cadmium, cobalt, mercury, and molybdenum occur as sulfide minerals. In the extraction of metals from sulfides, roasting is applied to achieve different objectives depending on the overall process flow sheet.
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The oxidation of sulphide minerals
Under mild oxidising conditions, such as an air atmosphere and heating rates of 10–20°C min −1, the oxidation occurs as a sequence of reactions usually controlled …
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Electrochemistry of Flotation | SpringerLink
The main contents are as follows. (1) The electrochemical reaction of collector-sulfide ore mineral. In the process of flotation, when the sulfide collector (including xanthate, black catching agent, and sulfur-nitrogen agent) contacts with the sulfide mineral surface, the collector is oxidized in the anode region of the mineral …
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Oxidation of Sulfide Minerals in Benefication Processes
Results of recent experimental studies and modern theoretical concepts are combined in this volume to provide a comprehensive analysis of sulfide mineral oxidation processes. Introductory chapters discuss the properties of sulfide minerals and various investigative techniques, followed by chapters on oxidation mechanisms and the …
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Analysis of Oxidation of Sulfide Minerals in Copper–Nickel …
The oxidation-induced alteration of properties of sulfide minerals is analyzed. The air-and-gas content and thermodynamic parameters of mine air are experimentally …
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Mineralogy-dependent sulfide oxidation
Tracking the S oxidation pathway in sulfide-bearing mine waste-rock piles is complicated by variations in water content, O 2 and Fe 3+ concentrations, microbial diversity, mineralogy, the occurrence of a variety of S species associated with incomplete oxidation, and nonlinear coupling between physicochemical processes. Synchrotron …
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Transformation of minerals and mobility of heavy metals …
In addition, small amounts of gypsum and residual pyrite were observed in the SS sample (Fig. S5), confirming that gypsum is a relatively stable sulfate in weakly alkaline seawater and that pyrite is galvanically protected as a result of a high rest potential relative to other common sulfide minerals during the oxidation process (Fallon et al ...
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Full article: The Direct Leaching of Nickel Sulfide Flotation
The Activox® process is essentially a low temperature (80–110°C), pressure oxidation process utilizing oxygen gas as the oxidant, whereby base metals are leached from the concentrate whilst sulfide is oxidized to elemental sulfur, thus reducing the oxygen requirement for leaching versus high temperature, high pressure oxidation …
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[PDF] Roasting of Sulfide Minerals
In addition to common metals like copper, lead, zinc, and nickel a number of other metals such as antimony, bismuth, cadmium, cobalt, mercury, and molybdenum occur as sulfide minerals. Sulfides are not reduced with the most widely used reducing agents, carbon and hydrogen, because the free energy change for the reactions 2MS + C = 2M + CS2 and …
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Oxidation of Sulfide Minerals in Benefication Processes
1. Properties of Sulfide Minerals Methods of Investigation of Sulfide Mineral Oxidation Processes 2. Electrode Kinetics and Oxidation Mechanism 3. Mutual Influence of Sulfide Minerals on Their Oxidation 4. Estimates of the Thermodynamic Stability of Sulfide Minerals Under Oxidizing Conditions 5. Oxidations of Sulfide …
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Potential Processing Routes for Recovery of Platinum Group …
The beneficiation of platinum group metals (PGMs) from pristine (unweathered) sulfide ores has conventionally been conducted through froth flotation, …
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Oxidation of Sulfide Minerals in Benefication Processes …
Author: A Abramov Publisher: CRC Press ISBN: 9789056995706 Category : Science Languages : en Pages : 336 Download Book. Book Description Results of recent experimental studies and modern theoretical concepts are combined in this volume to provide a comprehensive analysis of sulfide mineral oxidation processes.
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4.3: Weathering
Remember that the most common minerals in Earth's crust are the silicate minerals. Many silicate minerals form in igneous or metamorphic rocks. The minerals that form at the highest temperatures and pressures are the least stable at the surface. Clay is stable at the surface and chemical weathering converts many minerals to clay (figure 6).
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Thermodynamics and kinetics of sulfide oxidation by …
Introduction. The oxidation of hydrogen sulfide is arguably one of the most important processes in the environment as the oceans have been suboxic or anoxic and euxinic (i.e., sulfidic) for long spans of geologic time (Canfield and Raiswell, 1999; Turchyn and Schrag, 2006).These are the oceans in which eukaryotes evolved and sulfur …
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Biomining (Mineral Bioleaching, Mineral Biooxidation)
The term bioleaching refers to the conversion of an insoluble metal (usually a metal sulfide, e.g., CuS, NiS, ZnS) into a soluble form (usually the metal sulfate, e.g., CuSO 4, NiSO 4, ZnSO 4).As the metal is extracted into water, this process is called bioleaching. Because this process involves oxidation, it may also be termed biooxidation.
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Bacterially mediated mineral formation; insights into …
DOI: 10.1515/9781501509247 Corpus ID: 130607958; Bacterially mediated mineral formation; insights into manganese(II) oxidation from molecular genetic and biochemical studies
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The critical role of minerals in persulfate-based advanced oxidation …
Nowadays, the persulfate-based advanced oxidation processes receive more and more attention due to high efficiency, strong controllability, easy operation, and economic competitiveness, which is generally employed for the efficient degradation of organic contaminants. ... Copper sulfide (CuS) minerals, possessing metallic …
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Investigation of cleaner sulfide mineral oxidation …
Bio-oxidation technology for leaching sulfide mineral of refractory gold concentrate is cleaner than conventional methods. Although liquid agitation can maintain cells and particles in suspension, thereby improving the mass transfer efficiency of oxygen, carbon dioxide, and nutrients, it also generates shear stress, which can reduce bio …
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Sulfide Mineralogy and Geochemistry
Such mineral processing (beneficiation) involves crushing and grinding of the ores to a very fine grain size in order to liberate the valuable metal-bearing (sulfide) minerals which can then be concentrated.
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5.2: Chemical Weathering
Oxidation is another very important chemical weathering process. The oxidation of the iron in a ferromagnesian silicate starts with the dissolution of the iron. ... A special type of oxidation takes place in areas where the rocks have elevated levels of sulfide minerals, especially pyrite (FeS 2). Pyrite reacts with water and oxygen to form ...
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Metal Sulfide Reactions
The process of arsenopyrite oxidation can occur via several mechanisms, depending on what one assumes is the oxidizing agent and what oxidation state one assumes the products are in. ... A key step in the reactions of all the sulfide minerals is that they release iron as ferrous ion (Fe 2+). Oxygen present in the water can then oxidize Fe 2 ...