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OA10080A - Sulfide roasting with lime - Google Patents Sulfide roasting with lime Download PDF Info Publication number ... OAPI Prior art keywords lime sulfur minerais space reactor space Prior art date Application number OA60274A Inventor Willem P C Duyvesteyn Manual R Lastra Original Assignee Bhp Utah Int Inc
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Abstract. 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-forming minerals. Several factors control the oxidation rate including: the oxidant type, sulfide morphology, microbial action, and trace element contents.
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Roasting destroys sulfide grains and exposes gold to cyanide. This method also forms low-melting compound coatings on gold grains, which hinders leaching and …
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Publisher Summary. Circulating fluidized-bed (CFB) technology has been successfully applied to the roasting of refractory gold ores and concentrates on both pilot plants (200, 350 and 700mm furnace inner diameters) and commercial CFB roasting plants. The CFB provides conditions for enhanced heat and mass transfer, supporting …
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The total sulfur was 5.7% and the sulfide sulfur was 5.6%. Gold and silver grade of Comp #2 was 1.2 g/t and 8.8 g/t, respectively. Copper and arsenic concentrations were lower than 0.07% and 0.03%. Total sulfur was 5.0% with 4.9% sulfide sulfur. The gold recovery from the Sand Farming was comparable to POX and roasting.
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SEM analysis was carried out to complete the study of the phase change of compounds in the oxidation of mineral sulfides. Roasting of refractory gold ore with a composition of 180 kg NaClO 3 and 180 kg water/ton ore reached a temperature of 470 °C at a microwave power of 400 watts for 30 minutes. Total oxidized sulfur reached 90.6%, …
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This roasting plant, since closed down, was equipped with eight standard 70-spindle Edwards roasters, though only four were finally in use. Fuel was supplied to four ports on each furnace in the form of pulverized lignite of 8500 B.t.u. value prepared at a central plant. About 7 tons of fuel … See more
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As usual the reaction mechanism may occur in several stages: Adsorption of oxygen at the surface of the sulfide mineral particles. Incorporation of oxygen in the lattice of the mineral after release of electrons. O2 = O2 − + 2e and neutralization of sulfide ion …
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Eight-ton batches are fed to the mixer. Sufficient lime is added for the proper degree of alkalinity. Then additional cyanide solution is pumped in to bring the strength to 0. 03 per cent. The batch is then stirred for 4 hr. and then discharged into an agitator vat. The mixer handles two batches per day.
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Many gold deposits contain finely disseminated gold particles in iron sulfide minerals such as pyrite. These minerals are called refractory gold ores because of the presence of gold, which occurs either as disseminated fine gold particles—typically <1 µm [] or as fine particles of gold encapsulated in the ore host [2,3].In certain ores, extraction …
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In this study, the oxidation roasting pre-treatment technique was used to treat the Carlin-Type gold ore. This included a two-stage roasting process: the arsenic was removed in the first roasting process, …
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1. Introduction. Roasting plays an important role in pyrometallurgical and hydrometallurgical routes to enable the extraction of metals from sulfidic minerals through oxidation into their respective sulfate and/or oxide minerals (Prasad and Pandey, 1998) (Wulandari et al., 2020).In pyrometallurgy, roasting is widely applied as a pretreatment, …
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Acid pressure oxidation is generally believed to be the most effective pretreatment for refractory sulfide gold ores and concentrates, although it is ineffective for some ores. For such ores and concentrates (usually those containing both carbonaceous and sulfide materials), roasting remains the most effective pretreatment before cyanidation. …
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Roasting is a key pyro-metallurgical technology for a vast number of ores and concentrates. Over the past years considerable research and development efforts have focused on expanding the application window of roasting. Materials that previously needed to be separated from roasting feeds can now be blended with roaster feed after special …
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Sulfurization Roasting. It is a roasting process with sulfur dioxide as the reactant. 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 mainly includes the following processes: $$ 2mat {MeS}+3 {mat …
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Highlights. •. A complete process of gold recovery from sulfide refractory gold ore was proposed. •. The recovery efficiency of Au was increased by adding pyrite …
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Abstract. Gold roasting is a process, applicable to refractory ores and concentrates that contain sulfide sulfur, organic carbon, and potentially arsenic. Removal of these compounds is necessary to achieve high gold recovery (>90%) during cyanide leaching. Gold roasting is typically a metallurgical fluidized bed process.
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Gold Mining Equipment,Gold ore crusher ... roasting gold sulfides with lime in rock springs wyoming united states. ... 500T-600T Medium Hard Rock/Hard Rock; … gold tables for sale in south africa Gold Shaking Tables - Xtruder 255 by MSI Mining. ... gold ore roasting using lime in rock springs wyoming united states. types of gold mining in ...
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Oxidative roasting is used extensively to pretreat base and precious metal-bearing materials and to oxidize iron sulfides to generate sulfur dioxide for fixation with …
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roasting gold sulfides with lime (14 Jun 2012) Gulin supply Mining and construction equipment for mineral handling. The crushing, screening, washing, grinding equipment in stationary, portable, tracked type is available. Also turnkey projects of …
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The fine gold particles which are locked inside non-porous sulfide minerals cannot be extracted due to hindrance of the reaction between gold and cyanide ions, while the presence of naturally occurring carbonaceous matters (i.e. elemental carbons, organic carbons or hydrocarbons) can lead to adsorption of the dissolved aurocyanide complex …
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The roasting process effectively converts the contained sulfide minerals to SO 2 gas, and carbonaceous matter to CO 2 gas, thereby expelling both sulfur and carbon from the treated material and ...
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With a "sweet" roast, the calcine usually yields a high gold extraction with low lime and cyanide consumption. Mispickel in the raw …
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Lime comes out of ground as limestone, add heat you get Quicklime (3/8 minus) Quicklime plus water, you get hydrated lime. Notes: Material gets very hot during …
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The main causes of refractory gold ores are submicroscopic gold, the Au-Ag tellurides, and very fine-grained gold (<10 µm) locked in sulfides. Other types of problem gold ores include copper-gold ...
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@article{osti_5830393, title = {Controlling CO sub 2 emissions in the roasting of gold concentrate}, author = {Nyavor, K and Egiebor, N O}, abstractNote = {This paper reports that acid pressure oxidation is generally believed to be the most effective pretreatment for refractory sulfide gold ores and concentrates, although it is ineffective …
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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 …
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WebOptions to Treat Refractory Orpdf - Albion Process, roasting gold sulfides with lime, Smelting and Roasting Gold and Silver sulfide Ores to recover values... Know More. ALTA Gold 2012 E. high carbonate and arsenic content and an ore with high silver, bio oxidation and roasting, for specific ores, and these estimated costs and ore sulfide
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DOI: 10.1016/j.mineng.2020.106304 Corpus ID: 216158124; The influence of lime and sodium hydroxide conditioning on sulfide sulfur behaviour in pyrite flotation @article{John2020TheIO, title={The influence of lime and sodium hydroxide conditioning on sulfide sulfur behaviour in pyrite flotation}, author={Joseph John and Clinton L. Evans …
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Abstract—Gold and silver are capable of forming stable natural compounds with different elements. For gold 36 minerals are known: 10 in the class "Native metals, intermetallic compounds" and 26 in the class "Sulfides (selenides, tellurides, arsenides, antimonides, bismuthides)." For silver, 194 minerals are registered in the MMA, …
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