0086-21-58386256
To recover gold from sulfide ores, various methods such as flotation, roasting, pressure oxidation, or bioleaching may be used. These methods aim to break down the sulfide minerals and liberate ...
The surface conversion of sulfide mixtures from a sulfide/sulfide to an oxide/sulfide system facilitated separation using the oxide collector Flotinor FS-2. Therefore, the approach of applying selective surface oxidation of mineral mixtures by low-temperature plasma pretreatment seemed to be a promising strategy for improving the separation ...
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 …
Canadian Mineralogist Vol. 18,pp. 365-372(1980) OXIDATIONOF SULFIDEMINERALS. V. GALENA,SPHALERITE AND CHALCOGITE H.F. STEGBR eup L.E. DESJARDINS
Although the sulfide minerals have been depleted in the very shallow tailings, the modelling suggests that sulfide oxidation will continue for hundreds and possibly thousands of years. The combination of sulfide minerals, principally pyrrhotite, that is susceptible to weathering processes and the relatively dry, coarse-grained nature of the ...
Magmatic concentration 2. Hydrothermal process 3. Sublimation process b) Sedimentary process- 1.Sedimentary deposit 2.Oxidation and supergene enrichment 3. ... processes and activities of thermal springs beneath bodies of water. They are predominantly accumulations of sulfide minerals that precipitate from hydrothermal fluids on or below the ...
Overall, these novel isotopic results demonstrate that geological processes can provide a steady long-term sulfate source in deep fracture fluids by in situ oxidation of sulfide minerals in their host rocks, and thereby a mechanism to sustain the terrestrial subsurface biosphere, even in deep, high-temperature, long-isolated water systems. Thus ...
The oxidation of copper sulfide minerals during grinding and their interactions with clay particles. Author links open overlay panel ... bitumen and other valuable minerals have a deleterious effect on the mineral flotation process. They are naturally fine-grained with particles of colloidal sizes and may coat the mineral surface in a way ...
1. Introduction. Covellite (CuS) is one of the most common secondary copper minerals in nature (Hidalgo et al., 2020; Yin et al., 2018; Zhang et al., 2020).In both sulfate and chloride leaching systems, CuS is classified as an intermediate product during the oxidation process of chalcocite (Cu 2 S) (Aracena et al., 2019; Fang et al., 2018; Miki et al., 2011; Niu …
It focuses on the hydrothermal interactions between acidified copper sulfate solution and sulfide minerals, which are of key significance for the hydrothermal enrichment process, including the main copper minerals (CuFeS 2, Cu 5 FeS 4, CuS, Cu 2 S) and those (e.g., ZnS, FeS 2, and PbS) that are often associated with copper concentrates as ...
The behavior of heavy metals during sulfide weathering in terrestrial settings has been studied in detail. Examples of those findings are as follows: leached base metals (e.g., Cu), owing to the oxidation of pristine sulfide outcrops, usually transport downward to form high-grade supergene metal deposits (e.g., Reich and Vasconcelos, 2015; Zammit et al., 2015); …
Oxidation of sulfide minerals releases sulfuric acid and dissolved metals, with iron sulfides pyrite (FeS 2) and pyrrhotite (Fe (1−x) S) recognized as the most common acid …
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 Minerals in the Presence of …
Results are useful to clarify the hydrogeochemical paths involved in the release and attenuation of pollutants, improving our understanding of stream responses to …
In situ oxidation of sulfide minerals supports widespread sulfate reducing bacteria in the deep subsurface of the Witwatersrand Basin (South Africa): Insights from multiple sulfur and oxygen isotopes Long Li, Siwen Wei, Barbara Sherwood Lollar, Boswell Wing, Thi H. Bui, Shuhei Ono, Maggie C.Y. Lau Vetter, Tullis C. Onstott, Thomas L. Kieft ...
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.
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 + …
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 dolomites show much higher …
behaviour of these minerals is supported by solid state diffusion as the rate limiting step. 2. Introduction Sulfide minerals are the main sources of non-ferrous metals (Vaughan, 2006). Pyrometallurgical treatment of these minerals has been traditionally used in industrial practice. Although these methods have many advantages, they are ...
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.
The exposure to air does not involve the formation of ferric sulfate or elemental sulfur in the first layers of these two sulfide minerals. PbS surface undergoes an oxidation into lead sulfate without preliminary formation of lead oxide; surface layers of ZnS change very slowly into sulfate. Decreasing rate of surface sulphation of these ...
The interest in metal sulfide precipitation has recently increased given its capacity to efficiently recover several metals and metalloids from different aqueous sources, including wastewaters and ...
Sustained sulfide oxidation by physical erosion processes in the Mackenzie River basin: Climatic perspectives ... A strong correlation between sulfide oxidation rates and mechanical erosion rates suggests that the exposure of fresh mineral surfaces is the rate-limiting factor of sulfide oxidation in the subbasins investigated. The chemical ...
Sulfide-mineral oxidation is a complex hydrobiogeochemical process involving the oxidation of metal-sulfide minerals, catalyzed by numerous bacterial and archaeal microbial species, and …
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 grain diameter size fractions of 45–106 μm and 106–150 μm were used, chosen based on optimal run duration in prior sulfide kinetics research (McKibben and Barnes, 1986, McKibben et al., 2008).To avoid erroneously high specific surface areas and initial dissolution rates that could be caused by fine powders adhering to the fresh mineral surfaces …
To better understand its impact on the leaching of gold, silver and sulfide minerals, an initial study of the role of NBS in the cyanidation of gold was undertaken and has been reported in the previous paper (Nicol et al., 2023).The approach is largely electrochemical in nature given that this reagent is almost certainly an alternative oxidant to dissolved oxygen …
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 ...
As a result of pyrite oxidation, stable species (polysulfides, S x 2−, and thiosulfates, S 2 O 3 2−) are generated, which possess oxidizing and coordinating abilities in …
Enter the email address you signed up with and we'll email you a reset link.