The presence of pyrites in many ore deposits, and its reaction with water and oxygen to form iron sulfate and sulfuric acid, creates an important source of acid. Copper based nanoparticles have shown excellent anticancer activity as well as have been long used for radio-imaging. Both are constructed of acid resistant concrete and contain anodes (connected in parallel) interleaved with anodes (also connected in parallel). Therefore, the Me–S–Cl–H2O system is also a subject of theoretical studies, although not so frequently as the Me–S–H2O systems [72–74]. Their crystal structures usually consist of alternating hexagonal layers of monosulfide and disulfide anions with Cu cations in trigonal and tetrahedral interstices. The principal difference lies in what occurs at the anodes: oxygen evolution at the electrowinning anodes, dissolution of copper – the reverse of reaction [1], at the electrorefining anodes. TABLE 30.6. Evans, in Reference Module in Materials Science and Materials Engineering, 2016. J.W. High-purity cobalt metal is electrowon from cobalt sulfate electrolyte. The estimated flotation stage recoveries and the feed mass flow rates are given in Table 1. Typical operating conditions for copper electrorefining cells are (Habashi 1998): 100–200 Amps m−2 at a cell voltage of 0.3 V with an electrolyte of 40 g L−1 of copper and 150–200 g l of sulfuric acid. But it is more often used to clear sewer lines of invasive tree roots, which can burst pipes and lead to costly repairs if left untreated. In order to determine these effects, detailed simulations of the behavior of the main mineral component of the metallic inclusions in the slag, i.e., cubanite, were carried out. Frank K. Crundwell, ... William G. Davenport, in Extractive Metallurgy of Nickel, Cobalt and Platinum Group Metals, 2011. INHALATION: Remove to fresh air, keep warm and quiet, give oxygen if breathing is difficult. TABLE 30.2. Most minerals require the application of both an acidic environment and an oxidizing agent to leach copper as Cu2+. Copper sulfate is also used in order to help with public health and safety. Sketch of a copper electrorefining cell from (Evans and DeJonghe 2002). Note the sulfate roasting, the precipitation of cobalt hydroxide and the redissolution of the cobalt hydroxide followed by cobalt electrowinning. In solutions with a high copper content above 0.1 M Cu the copper chloride CuCl is stable. The data are approximate. Alternatively stainless steel cathode blanks are used as described above under Copper Electrowinning. Industrial Cobalt Electrowinning Details∗. On-stream particle size and on-stream X-ray fluorescence analyses are key components of this automatic control. In this example, the production of a copper concentrate is investigated. It is designed to give soluble sulfate calcine rather that insoluble oxide calcine. Felipe D. Sepulveda, ... Edelmira D. Gálvez, in Computer Aided Chemical Engineering, 2012. Experimental procedure involves the reaction of 15 ml Triton X-100, 25 ml A glance at Table 1 shows that there is little tendency for the iron in the electrolyte to co-deposit with the copper; copper deposition is thermodynamically much more favorable. Other leaching methods include ammonia leaching, which is used for certain copper oxide ores. Common Names and Synonyms: Cuprous sulfide. Pourbaix diagram of the Cu–Fe–S–O–H2O system at 25 °C. E–pH diagram of the Cu–S–Cl–H2O system at 25, 100 and 150 °C, the activity of sulphur-containing substances is equal to 10−1 M, the activity of copper- containing substances of 10−6 M and the unit activity of chlorides and the total pressure of 0.1 MPa. [11][12]. Copper Sulfide is a crystalline solid used as a semiconductor and in photo optic applications. It has the chemical compound Cu2S. Research done by Havlik (2008) and others (Peters, 1977) has demonstrated that cubanite is not stable in a hypergenic environment and in the presence of water and oxygen is converted at a fast rate into chalcopyrite according to reaction equation: whereas the formed chalcopyrite in the same environment will undergo further conversion into bornite according to reaction equation: Bornite is a more stable copper and iron sulphide in a hypergenic environment than cubanite and chalcopyrite. On the other hand, copper (II) sulfide finds applications in solar cells, superionic conductors, photodetectors, electroconductive electrodes, photothermal conversion devices, microwave protective coating, active radio wave absorbers, gas sensors and radiation polarizer… E–pH diagram of the Cu-S-Cl-H2O system for 100 °C, the activity of sulphur-containing substances of 10−1 M, the activity of copper-containing substances of 10−1 and 10−2 M at the unit activity of chlorides. Seek medical attention. EC#: 215-271-2. With increasing temperature the amount of the copper complexes in the system varies. Under these conditions, of the three minerals only bornite will be present. The input is high-purity cobalt sulfate electrolyte ~20 g/L Co2+. Its principal employment is in agriculture, and, up to a generation or so ago, about its only uses in industry were as a mordant for dyeing and for electroplating. Copper disulfide is a metallic conductor due to the incomplete occupancy of the sulfur p band. 1. Investigations of covellite (CuS) indicate that there are other metastable Cu-S phases still to be fully characterised.[1]. Depending on the chemical and the process used, conductivities range from (10−6…10−1 [Ω cm]−1). Some copper sulfides are economically important ores. It is widely used in agriculture as a fungicide in fruit and vegetable farming.It is available as a dust, wettable powder, and as a liquid. The anodes are electrolytically refined in cells sketched in Figure 8. CAS#: 1317-40-4 %: 100. For instance, anhydrous copper sulfate can be used as a dehumidifying agent. This is cast into slab-like anodes. Elemental copper found in nature can be leached by either oxygen or ferric ion: All copper sulfides require the presence of Fe3+ and O2 as oxidizing agents for leaching to occur. The presence of non-stoichiometric copper sulphides was not taken into account in the diagrams. The chemical properties of copper sulfide are provided in the table below: Common Names and Synonyms: Cupric sulfide. A typical structure is cell-core or side-by-side bi-component structure. [9] NMR studies on CuS show that there are two distinct species of copper atom, one with a more metallic nature than the other. Most of the copper ores mined today are oxide or sulfide ores. FIGURE 30.7. K. NowińskaA. IDENTIFICATION. In many cases, the copper sulfate test is used as a pass/fail examination of a passivation process on a part or stock material, but it can also be used as a test to determine if passivation is necessary in the first place. Both minerals and synthetic materials comprise these compounds. Fig. The pregnant solution goes to solvent extraction to separate Cu2+ from Co2+ and eventually to copper electrowinning and cobalt electrowinning. COPPER SULFIDE . EC#: 244-842-9. Typical operating conditions for copper electrorefining cells are (Habashi, 1998): 100–200 A m-2 at a cell voltage of 0.3 Vwith an electrolyte of 40 g l-1 of copper and 150–200 g l-1 of sulfuric acid. The stability of bornite is determined by a relatively narrow range of pH values and very narrow range of Eh values, nearly irrespective of the seasonal temperature (Figure 2): Figure 2. pH–Eh diagrams for Cu–Fe–S–H2O system. Zdzisław, in Reference Module in Materials Science and Materials Engineering, 2017. In chemistry, a "binary copper sulfide" is any binary chemical compound of the elements copper and sulfur. Eng.,19', 204 (2006). The leaching of copper sulfide and copper oxide ores entails partial dissolution to cupric sulfate with sulfuric acid and iron sulfate. One path is as follows: In this case, at high pH (>8) and low Eh (≈−0.59…−0.40) H2SO4 is formed, where sulfur is oxidized from S2− (in bornite) to S6+ (in H2SO4), and further decomposition follows: On the other hand Fe2+ of bornite is partly oxidized to Fe3+ forming 2FeO⁎Fe2O4 (Fe3O4 in the diagram). Copper sulfate is used to test blood for anemia. The activity of copper-containing substances in the solution is 10−3 M and the activity of sulphur-containing substances is equal to 10−1 M at a total pressure of 0.1 MPa. Expert control systems help to optimize the performance of flotation plants. Although many textbooks (e.g. Column flotation cleaner cells are particularly effective at giving a high Cu grade in the concentrate. In comparison with the previously discussed diagrams, the diagrams of the Cu–S–Cl–H2O system are characterised by the presence of a large area of stability of univalent chlorine complexes of copper. W. G. Mumme, R. W. Gable, V. Petříček, Canadian Mineralogist; (2012); 50; 423-430. −5 °C – pH=6.1÷11.0 (∆pH=4.9); Eh=−0.59÷−0.29 (∆Eh=0.30). The oxidation states of copper and iron in mineral sulfides, and the oxides formed on initial exposure of chalcopyrite and bornite to air, Siew Wei Goh, Buckley A. N. Lamb R.N., Rosenberg R. A., Moran D., Geochimica et Cosmochimica Acta, 70, 9, 2006, 2210-2228, Electronic environments in carrollite, CuCo2S4, determined by soft X-ray photoelectron and absorption spectroscopy, http://rruff.geo.arizona.edu/doclib/hom/villamaninite.pdf, Copper sulfides mineral information and data, https://en.wikipedia.org/w/index.php?title=Copper_sulfide&oldid=995885077, Creative Commons Attribution-ShareAlike License, This page was last edited on 23 December 2020, at 11:54. The resulting Fe2+ is reoxidized to Fe3+ by O2. 6. This substance is mainly used as a pesticide in agricultural or nonagricultural practices to help eliminate bacteria, algae, roots, plants, snails and fungi. In electroplating processes. Table 5.8. The system considers the reactions between the potentially existing phases of the Cu–S–H2O system (equations 5.185–5.208) and ions and substances containing chlorine, Table 5.8. 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