The sulphide ore is roasted with sodium chloride in air. Metal sulphides are converted to chlorides that can be separated from the unaffected gangue material. ... obtained during the oxidation of ...
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a From the data given below construct relevant portion of the predominance area diagram of Ni–S–O system:$$ mathrm{NiS} left(mathrm{s}right)+frac{3}{2}{mathrm{O}}_2left(mathrm{g}right)=m...
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The roasting of sulfide ores and concentrates is one of the most important steps in pyrometallurgical metal production from primary raw materials, due to the necessity of excess …
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Metal sulfide is described as another big group of photocatalyst materials used for the reduction of CO 2.The photocatalysts of metal sulfide involves CdS, ZnS, MnS, Cu x Ag y In z Zn k S solid solutions, and Cu 2 ZnSnS 4, which have been utilized for photoreduction of CO 2 in different solvents. Metal sulfides have small band gaps with higher VB as compare to metal oxides, …
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Chlorinated roasting is a process of adding chlorination agents (Cl 2, NaCl, CaCl 2, etc.) to react with metals, metal oxides, and sulfides in cyanide tailings to produce metal chlorides with ...
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Download Citation | 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 ...
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In roasting, air in large amounts, sometimes enriched with oxygen, is brought into contact with the sulfide mineral concentrate. This is done at elevated temperatures when oxygen combines with sulfur to form sulfur dioxide and with the metal to form oxides, sulfates and so on.
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There are several different types of roast, each one intended to produce a specific reaction and to yield a roasted product (or calcine) suitable for the particular processing operation to follow. The roasting procedures are: Oxidizing roasts - which remove all or part of the sulfur from sulfide metal compounds, replacing the sulfides with oxides.
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In the extraction of metals from sulfides, roasting is applied to achieve different objectives depending on the overall process flow sheet. Such objectives include one or more of the …
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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 + …
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In many hydrometallurgical processes, particularly in which bioleaching of chalcopyrite or oxidative leaching of bornite and covellite are not capable of leaching metals efficiently, roasting is a key pretreatment step for conversion of sulfides into oxides before acid or ammoniacal leaching can be carried out efficiently (Shamsuddin, 2016).
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Zinc Dead roasting Total sulfur elimination ZnS Pure metal oxide, sulfuric acid, steam (power generation) Non-ferrous metals, sulfuric acid, energy, iron oxide Dead roasting, low temperature roasting Total sulfur elimination Pyrite, tailings, metal sulfides (e.g. Cu, Co, Ni, Zn sulfides), gold ores Metal oxides (Ag, Au, Co, Cu,
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During the roasting process of double-refractory ores in the presence of oxygen, the main reactions are the combustion of the carbonaceous material and sulfides. From: Gold Ore Processing (Second Edition), 2016. About this page. Add to Mendeley Set ... Also, there is a tendency to lose some metal ions from the fiber's outer surface (Lu et al ...
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Roasting is gas/solid reaction in which sulphide is converted to oxide or sulphate or even to metal. Whether roast product is oxide or sulphate or partially sulphide would depend on temperature …
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Following the sulfur roasting process, the resulting products consist of Li 2 SO 4 or Li 2 CO 3, which is soluble in water, along with metal oxides or metal sulfides like MnO, MnS, NiS, Ni 3 S 2, Co 3 S 4, and Co 9 S 8, which are insoluble in water. Consequently, water leaching presents itself as an environmentally friendly approach for the ...
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It is usually used for roasting sulfide ores to oxidize certain metal sulfides into sulfates that are easily soluble in water. If Me represents the metal, the sulfurization roasting …
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oxidation of metal sulfides has the benefit that low temperatures and pressures are required, leading to lower capital costs (Anderson and Nordwick, 1996; Anderson, 2001). The biggest problem with partial oxidation of metal sulfides is that sulfur containing streams cannot be readily treated using cyanidation, making difficult to recover the gold.
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By contrast, sulfidation roasting is a more commercially feasible process to obtain metal sulfides with sufficient particle size and good crystalline structure 31, because high temperature favors the formation and growth of mineral crystals, and hence shows better results for the metal recovery from low-grade oxide ores or smelting wastes by ...
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Therefore, the roasting reaction mechanism might be quite complex due to the variety of reactants. However, most researchers agree that the direct reactions between ammonium sulfate and minerals (metal oxides or sulfides) are mainly …
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In the extraction of metals from sulfides, roasting is applied to achieve different objectives depending on the overall process flow sheet. Such objectives include one or more …
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In this study, sulfidic tailings of Neves Corvo Cu-Zn-Pb-mine (Portugal) underwent conventional roasting (CR) and microwave-assisted roasting (MR) to compare the effect of …
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Many investigators have studied the kinetics of roasting of metal sulfides. By and large, roasting of zinc sulfide is carried out at and above 800 C to produce zinc oxide [2ZnS (s) + 3O2 (g) ¼ …
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The sulfidation roasting −flotation technology is currently widely employed and highly advanced due to the exceptional hydrophobicity and excellent floatability exhibited by metal sulfides [22]. The metal oxides and hydroxides are initially transformed into metal sulfides through the process of sulfidation roasting, followed by subsequent ...
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