Oxidation Of Sulfide Minerals Benefiion Processes

Typical magmatic sulfides are dominated by pyrrhotite and pentlandite with minor chalcopyrite, and the bulk atomic Cu/Fe ratio of these sulfides is typically less than unity. However, there are rare magmatic sulfide occurrences that are dominated by Cu-rich sulfides (e.g., bornite, digenite, and chalcopyrite, sometimes coexisting with metallic Cu) with atomic …

In the gold mining industry, the precious metal is generally found in a sulfide mineral matrix (Podder et al., 2022). Conventional methods such as cyanidation, pyrometallurgy, roasting, and ...

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 MS + H2 = M + …

minerals before oxidation. Weathering results in significant geochemical changes in the oxidation state of a sulfide-bearing mineral deposit because most ore deposits are characterized by minerals containing base metals and reduced Fe and S. Figure 1 shows a schematic model of the components of an oxidizing rock volume containing sulfides and the

The kinetics of the reagent oxidation of a sulfide mineral in a hypochlorite electrolyte, in the temperature range of 22-45 ° C, at atmospheric pressure, has been studied by the rotating disk method.

Purpose Sulfur is distributed widely in soils and sediments. Sulfide oxidation causes acid mine wastewater, toxicity, and corrosion. Manganese oxide minerals usually affect the migration, transformation, and fate of sulfur. To understand the oxidation behaviors of S2− and influence factors, reaction process and kinetics were investigated by using different …

Tailings that have undergone oxidation are ochreous in colour and are apparent across the impoundment. Depletion of sulfide minerals in the shallow tailings, abrupt declines in gaseous-oxygen concentrations in the vadose zone, and elevated concentrations of dissolved sulfide-oxidation products in the tailings pore water are all indicative of sulfide oxidation.

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 minerals.

ns: number of moles of H2SO4 formed by the oxidation of one mole of sulfide mineral s; 98: molecular weight of H2SO4 (g.mol–1); 10: conversion factor for recasting in kg.t–1; Xs: amount of sulfide mineral s in wt%; ws: molecular weight of sulfide mineral s (g.mol–1); m: number of sulfide minerals in the sample.

Surface oxidation of the sulfide minerals negatively affects the flotation performance, i.e., the selectivity and even the recoveries at heavy oxidation conditions. Oxidation may take place during the formation of the ore, during …

The vast majority of works attribute the passivation of the surface of these minerals by the formation of dehydroxides [Fe(OH) 2], oxyhydroxides [FeO(OH) n H 2 O], poorly soluble metal-deficient polysulfide, jarosite [KFe 3 (SO 4) 2 (OH) 6] and sulfur compounds as the main responsible for the low extraction efficiency of refractory ores (Kaksonen et al., 2020, Panda et …

In recent years, advanced oxidation processes (AOPs), especially those based on metal sulfides, have been recognized as one of the most effective techniques for controlling water pollution due to their superior catalytic performance and stability. ... Pyrite (FeS 2) is an abundant sulfide mineral containing structural Fe 2+ and has been ...

the mineral processing and process metallurgy groups of our department and mineral processing department at Boliden Mineral AB are greatly appreciated. The financial support in the form of scholarship from the Iranian Ministry of Sciences, Researches & Technologies (MSRT) and Boliden Company is gratefully acknowledged.

Biogas is a fuel where hydrogen sulfide concentration can reach particularly high levels (Ciahotný and Kyselová, 2019).Sulfate reducing bacteria (SRB), a member of the microbial consortia in anaerobic digestors, actively utilize sulfate in the feed as electron acceptor (Madden et al., 2014).As part of their anaerobic respiration process, SRB produce hydrogen sulfide, …

The results obtained demonstrated that the proposed two-stage process made it possible to increase the bioleaching efficiency, as chemical oxidation can allow to perform the oxidation of refractory sulfide minerals under conditions that promote efficient oxidation of the minerals (high temperature, addition of sodium chloride), but can suppress ...

This oxidation of sulfide at low concentrations may have ecological significance as abiotic oxidation of sulfide is slow with a half-life of 55 days in a trace metal-free solution at pH 12 and 25 ...

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 conductivity and ...

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).

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 metabolism may have …

This hypothesis of an electron transfer via iron cycling is providing a likely explanation of the microbe-mineral interactions on metal sulfide surfaces based on electrochemical processes, as has been described for pyrite oxidation (Rimstidt and Vaughan 2003) and is in agreement with the bioleaching mechanisms (Schippers and Sand 1999 ...

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 is ...

Figure 1 shows plots over pH for one and two-electron transfer reactions for the reaction of sulfide with oxygen, reactive oxygen species and oxidized nitrogen species. In some instances there is no pH dependence for a given reaction, but in most instances there is a significant pH dependence. Figure 1A describes the thermodynamics of sulfide oxidation in one-electron …

One of the main sources of non-ferrous and precious metals is sulfide ores. This paper presents a review of the existing literature on the electrochemical properties of some of the most common industrial sulfides, …

The oxidation of copper sulfide minerals and subsequent leaching of the soluble copper has long been a profitable operation. The chief oxidizing agent is oxygen from the air. This reaction is …

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 behavior of ...

Pressure oxidation process can completely and efficiently dissolve sulfide minerals, and it is not easy to form a passive film on the surface of the minerals. However, pressure oxidation process often has high requirements in equipment, energy cost, safety precaution, operation and maintenance.

Sulfide-mineral oxidation is a complex hydrobiogeochemical process involving the oxidation of metal-sulfide minerals, catalyzed by numerous bacterial and archaeal microbial species, and …

Beneficiation -process of crushing ore, separating minerals, and concentrating valuable minerals -Commonly required material needed to be processed to separate minerals containing useful …

The rates of dissolution of chalcopyrite, galena and sphalerite in the presence of pyrite were determined, respectively, as 18, 31 and 1.5 times more rapid than in single-mineral experiments. These data were consistent with galvanically-promoted mineral oxidation of the other sulphides in the presence of pyrite.

To investigate the oxidation reaction of sulfides, a newly designed infrared (IR) thermographic test protocol was used to visualise oxidising sulfide minerals and to classify the rock types...