A basic principle of many processes for extracting copper and nickel from sulfide ores is to overlay the molten ore or matte with a lime–silica–iron oxide slag and blow with air or oxygen. Some of the iron present in the ore oxidizes and as a result, partitions to the slag phase, while some of the sulfur is carried off as sulfur dioxide.

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Sulfide (British English also sulphide) is an inorganic anion of sulfur with the chemical formula S 2− or a compound containing one or more S 2− ions. Solutions of sulfide salts are corrosive. Sulfide also refers to chemical compounds large families of inorganic and organic compounds, e.g. lead sulfide and dimethyl sulfide. Hydrogen sulfide (H 2 S) and bisulfide (SH −) are the conjugate ...

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Differences Between Sulfides And Oxides Mining has always been a popular business sector in industry. Because of mining, we get to enjoy different jewelries that are made to be durable even over a long period of time. Research has shown that in 2011 mining earned approximately 805 million dollars for the government, which an increase of 114 million dollars from […]

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72 intergrowths between sulfide and associated gangue silicate and oxide minerals. Textures and 73 intergrowths in massive ores, semi-massive breccia ores and other variants of sulfide-74 dominated ores will be described in a forthcoming companion paper.

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Oxide–sulfide copper ore was sampled from the ore body Cerovo C1 (south deposit) and used in this study. The chemical composition of the ore sample is pre-sented in Table 1. From Table 1, it can be seen that the high copper concentration is in the sample, as well as

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A Pyhäsalmi mine excavates sulfide ore from volcanogenic massive sulfide deposits. The volcanogenic massive sulfide ore type is the most exploited type in Fennoscandia Shield.[ 16 ] The ore of Pyhäsalmi contains copper (Cu), zinc (Zn), iron (Fe), and sulfur (S).

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(a) calcining the granular sulfide ore at a temperature of 500° to 900° C. with addition of gas containing free oxygen to produce a gold-containing, metal oxide-containing solids mixture and an SO 2-containing exhaust gas; (b) forming an aqueous sulfite solution by contacting the SO 2-containing exhaust gas with an aqueous solution;

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Investigation of the sorption of heavy metals (e.g. As, Mo, Hg) and radionuclides (U, Tc) by pyrite surfaces has identified a number of complex reactions that lead to sorption. For example, in the sorption of Cd 2+, surface reconstruction and disproportionation occurs, leaving a mixture of sulfide and oxide products (Bostick et al. 2000).

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Sulphide ores of copper are insoluble in dilute sulphuric acid leaching solutions, but a very high extraction can be obtained if the copper ore is in the oxidized condition. The problem is to convert the sulphide into the oxide form. This can be done

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There are two main types of copper ore of interest: copper oxide ores and copper sulfide ores. Both ore types can be economically mined, but they are processed in different ways. Copper sulfide ...

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an intensely altered and leached Fe oxide-rich gossan (the remains of the original massive sulfide) that extends upward to the paleosurface. Studies of hydrothermal sulfide mounds and chimneys on oceanic spreading axes reveal a second type of gossan forma-tion: oxidation of sulfide minerals by interaction with oxygen-rich ambient seawater.

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The sulfide minerals are a class of minerals containing sulfide (S 2−) or disulfide (S 2 2−) as the major anion.Some sulfide minerals are economically important as metal ores.The sulfide class also includes the selenides, the tellurides, the arsenides, the antimonides, the bismuthinides, the sulfarsenides and the sulfosalts. Sulfide minerals are inorganic compounds

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copper content if the copper oxide zone developed is to be of potential ore grade, and requires also that removal of copper be minimal. Distinction between these protore environments is significant in exploration for copper oxide and supergene sulfide enrichment targets because prospects dominated by reactive rock units are likely

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Sample Questions. Ques: Why do the sulfide ores ensure the roasting process, and carbonate ore is calcined? (2 marks) Ans: In the roasting process, sulfide ore heats in the air and converts to metal oxide. But, in the case of carbonate ore, the moisture and carbonate are eliminated through the calcination process.

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Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite, where it occurs in both the chemically bonded state and as nano-size grains of metallic gold. During roasting or pressure oxidation, the sulfide matrix is destroyed and essentially all the gold is converted to the metallic form. The liberated gold is readily dissolved in conventional cyanide media ...

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Answer (1 of 5): The concentrated ore ( received after crushing and floating) is roasted in a furnace in the presence of a current of air. Sulphur is oxidized to SO2 and impurities of arsenous and antimony are removed as volatile oxides. The following reaction takes place. 2CuFeS2 + O2 —- Cu2S ...

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of sulfide ore and around 5.26 g of oxide ore powder were added into 100 ml of the leach solutions in the flasks. Individually and laboratory flask containing slurry density of 5% (5 g ore in 100 ...

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With a simple sulfide ore like chalcocite, once the sulfur has been burned off as sulfur dioxide (SO2) and the copper sulfide thus converted to copper oxide, the oxide can be reduced with charcoal, described above (Thompson 1958: 4). How the Indians happened on the roasting of sulfide ores may never be known. Obviously

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copper production from the mixed oxide-sulfide ore was observed to be directly impacted within the month when the method was at times replaced with the standard methods. Discussion of Test Work The boiling ferric sulfate method was developed as a laboratory tool used to mimic the actual chemical leaching behavior in the heap leach process.

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Molybdenum sulfide is the principal ore mineral to obtain molybdenum, a metal commonly used in alloys like stainless steel. This sulfide has a dark gray, metallic appearance and is very soft which ...

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A metal oxide is generally less stable than the metal sulphide. A metal oxide is generally less stable than the metal sulfide. Thus, reduction of metal oxide is easier than the reduction of metal sulfide. Hence, a sulfide ore is first converted into it's oxide before reduction. This process is known as roasting.

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Molybdenite is recovered from either primary molybdenite or copper sulfide ore by flotation, after the ore has been crushed and ground to a suitable size. Several stages of grinding and reflotation ... removes sulfur and converts the sulfide to oxide. The flue gas contains products of combustion, SO2, and may contain rhenium or selenium.

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and Ore R eserves". Chris De -Vitry consents to the inclusion in the report of the matters based on his information ... Simberi – Oxide and Sulphide . Page | 1 . Project Summary . The Simberi Gold Project is located on Simberi Island in the Tabar Islands Group situated in the New Ireland Province of Papua New Guinea (PNG), approximately 80 ...

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The Kansanshi mixed copper sulfide-oxide ore contains significant proportions of fine material manifesting in a variety of processing challenges. This paper presents the work which was carried out to evaluate the efficacy of desliming in improving the flotation response of the ore. Two modes of desliming were investigated, namely; sieving and elutriation after which the deslimed material was ...

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A sulfide ore is first converted into its oxide before reduction. This ...

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Unformatted text preview: OXIDATION ROASTING OF A COPPER SULFIDE ORE INTRODUCTION Pyrometallurgy deals with the heat treatment of ore, which lead to physical and chemical transformations of the minerals and allow the extraction of valuable metals.Chalcopyrite is a brass-yellow mineral with a chemical composition of CuFeS2. Roasting is essentially a surface reaction in which the oxide layer ...

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sulfide or laterite (oxide) resources. Historically production has been dominated by sulfide ores but future production is increasing shifting to laterite ores. The principal reason for this historically is that sulfide ores are easier to process, through conventional mining, smelting and refining, compared to laterite ores which ...

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The present invention discloses a new process for leaching sulfide minerals consisting of leaching crushed ore in a vat reactor, wherein the leaching solution is fed with an ORP value close to the upper limit suitable for leaching and the exiting leaching solution leaves the reactor with an ORP above the lower limit suitable for leaching the ore.

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The smelter for sulfide ores produces sulfur dioxide gas. This is scrubbed from the flue gases to make sulfuric acid for leaching copper from oxide ores. Scrubbing sulfur dioxide also protects the environment. A by-product of the smelting and converting furnaces is sulfuric acid. In what looks like a lucky coincidence, sulfuric acid is needed ...

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There are two main copper ore types of interest, copper oxide ores and copper sulfide ores. Both ore types can be economically mined, however, the most common source of copper ore is the sulfide ...

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