Secondary copper sulfide enrichment is widely accepted today as resulting from oxidation of copper sulfide minerals, downward migration of soluble copper sulfates, and precipitation as copper sulfide by reaction with primary sulfide minerals. Chalcopyrite is replaced preferentially to pyrite. Examples of sulfide enrichment above the water table ...

For copper sulfide ore, ... ore: A naturally occurring mineral containing valuable elements (often metals) which can be extracted from the surrounding mineral at a profit. ore reserve: A concentration or deposit of minerals in the earth's crust which is valuable and can be mined at a profit.

The refractory primary copper sulfide chalcopyrite is the most economically relevant copper mineral due to its abundance. Currently, copper is efficiently extracted from chalcopyrite by pyrometallurgical processes that are energy and water demanding. ... Despite its widespread use there have been limited studies into the processes occurring ...

The concentration of sodium thiosulphate has a strong impact on the preparation of copper sulfide because it acts as a reducing agent which leads to the oxidation of copper from Cu 2+ to Cu 1+.Thus, the impact of Na 2 S 2 O 3 ·5H 2 O on the properties of copper sulphide has been studied. The ratio of copper sulphate and …

Copper (I) sulfide, Cu2S, [2], MW 159.15, is naturally occurring as the blue or gray mineral chalcocite, [2]. Copper (I) sulfide or copper glance is insoluble in water but decomposes in nitric acid and concentrated sulfuric acid. Copper (I) sulfide is prepared by heating mixtures of copper and sulfur in a hydrogen atmosphere ...

Mixed oxide and sulfide copper ores are leached following the same process stages as in Figure 4. Also, some sulfidic ores that are too lean to treat by flotation are also leached in heaps or dumps. ... Bacterial leaching is being developed to operate much more effectively than that occurring naturally. Effective bacteria in sulfide leaching ...

Copper sulfide ores are typically the most profitable copper ore type to mine. That is because they have high copper content, and the copper in them can more …

Copper also forms an important series of alloys with aluminum, called aluminum bronzes. Beryllium copper (2 percent Be) is an unusual copper alloy in that it can be hardened by heat treatment. Copper is a part of many coinage metals. Long after the Bronze Age passed into the Iron Age, copper remained the metal second in use and …

This is true of relatively low value metals such as copper; for the precious metals commonly occurring as sulfides, or associated with them, the mineable concentrations (grades) are very much lower.

The material also provided aid to the redox reaction occurring on the surface of the electrode, which may be due to the lone pair of electrons present in the N and S atoms. 4.3.3. CuS-Based Mixed Metal Oxides . ... Mallick and co-workers reported on a copper sulfide (Cu 2 S)-based non-enzymatic glucose sensor with a detection limit of …

The Huangshandong intrusion comprises a massive unit and a layered unit (Fig. 2 a, Gao et al., 2013).The massive unit is dominantly made up of gabbronorite, whereas the layered unit is mainly composed of lherzolite, olivine gabbro, hornblende gabbro, and gabbrodiorite (Fig. 3).Sulfide mineralization occurs in the basal portion of …

In porphyry copper deposits, the sulfide mineralogy is composed of hypogene and supergene sulfides; the former represented by a variety of primary minerals, such as chalcopyrite and pyrite; the latter occurring as a replacement of primary sulfides throughout the supergene enrichment zone, usually in the form of secondary chalcocite …

Copper (Cu) ore is a naturally occurring mineral deposit that contains copper in varying concentrations. It is an important industrial metal that has been used by human civilizations for thousands of years due to its excellent electrical and thermal conductivity, high ductility, and resistance to corrosion. ... Copper-Nickel Sulfide …

The first undisputed site in which naturally-occurring copper was made into various artifacts is at Çayönü in Southeastern Turkey, which dates to the late eighth ... or a copper sulfide or copper oxide ore with charcoal produced elemental copper must have been a revelation – heating the sulfide ores was likely not a pleasant experience ...

Copper Sulfide. Definition. Copper sulfide is a crystalline solid used as a semiconductor and in photo optic applications. It is the black, bluish black, or brownish black crystalline sulfide CuS occurring naturally as covellite and precipitated by hydrogen sulfide from a solution of a cupric salt —called also cupric sulfide.

Copper Sulfide. Copper sulfides (and native copper) are leached by Fe3+, also assisted by direct bacterial action:(14.11a)2FeS2+7O2+2H2O→2Fe2++2SO42−+2H2SO4(14.11b)O2+4Fe2++4SO42−+2H2SO4→4Fe3++6SO42−+2H2O(14.11c)Cu2S+10Fe3++15SO42−+4H2O→2Cu2++10Fe2++12SO42−+4H2SO4. …

Volume 61: Sulfide Mineralogy and GeochemistryDavid J. Vaughan, editor. 2006 i-xiii + 714 pages. ISBN 0-93; ISBN13 978-0-93. The importance of sulfide minerals in ores has long been, and continues …

Copper sulfide (CuS) is a naturally occurring vulcanized mineral with metallic conductivity and a peculiar crystal structure that gives it favorable properties (Yin et al., 2019). Compared with the conventional metal oxide activators, CuS would be more effective in activating PMS, ...

The most successful copper heap leaching operations have been those processing copper oxides and secondary copper sulphides (Table 1).Chalcocite (Cu 2 S) is the main copper sulphide mineral mined at bioleaching operations. Some of the chalcocite heap operations began as oxide (chemical) leach operations and were converted to …

The regions of stability of each copper sulfide depends on the copper-to-sulfur ration in the total system. The diagram based on metastable copper sulfides and sulfur accounts for results of electrochemical studies at chalcocite surfaces. ... The TK diagram, which is an E h-pH-i contour map, can be used to evaluate the kinetics of the ...

Copper accumulates mainly at the surface of soils, where it binds tightly and persists. Copper sulfate is highly soluble in water and it can bind to sediments. Copper is regulated by plants because it is an essential …

In a typical procedure, copper sulfide colloids were obtained by mixing 5 mL of CuSO 4 solution (2 mM) and 5 mL of sodium sulfide solution whose concentration varied from 2 to 8 mM. The reaction media became brown in a few seconds; it was agitated for 5 min and then left unstirred with or without access of air. All the hydrosols were …

Research has shown that the reaction of copper with sulfide in the form of AVS to form insoluble copper sulfide is a key process that mitigates the bioavailability and toxicity of copper in sediments and influences its fate in natural systems (Berry et al. 1996; Di Toro et al. 1992, 2001b). Settling represents the primary metal source to the ...

It is formed by oxidation of copper sulfide ores and so is commonly found near the surface. Cuprite is found in Europe, Australia, Arizona, southwest Africa, and South America. Hardness 3.5–4; relative density 6.1. ... Copper poisoning is rare, occurring mainly in people who drink home-made alcohol distilled using copper tubing. Symptoms of ...

Three copper sulphide leaching and refining processes are d iscussed: total. pressure oxidation, ferric sulphate leaching and copper chloride leaching. Ferric sulphate leaching and. copper ch ...

Abstract. Over the past few years, considerable attention has been paid to biomedical applications of copper sulfide nanostructures owing to their enhanced physiochemical and pharmacokinetics characteristics in …

The novel mechanisms of formation and conversion of copper sulfide nanoparticles underline the role of sulfur species; this is important for understanding the …

Technical Report: Cadmium sulfide/copper ternary heterojunction cell research. Second quarterly technical progress report, June 1-August 31, 1979 ... Rapid diffusion processes occurring at the high substrate temperatures are described as precluding the use of thick selenide layers highly deficient in In as part of the cell structure. Growth of ...

The sulfide mineralization is hosted within the carbonaceous phyllite and banded impure marble of the Paleoproterozoic sequence of the Delhi Supergroup but …

oxygen in the sulfide solution, the oxidation of Cu to copper sulfide would still be the predominant process, as copper sulfide is more stable in a sulfide solution than copper oxide, based on thermodynamic data ( ΔG°=−101.46kJ/mol for the conversion from Cu 2OtoCu 2Sinsulfidesolutionsat 298K[7]: Cu O(s) + SH (aq) Cu S(s) + OH (aq)→ 2 − ...

Therefore, we succinctly designed and fabricated the novel triadic silica gel-supported copper sulfide (CuS) nanocomposites for ultrasensitive detection of Cr (VI). CuS nanocomposites in a solid phase system were successfully applied to extract Cr (VI) in reference materials, such as food and water samples. Cr (VI) were detected by use of …

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) …