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Most arsenic is obtained not from an ore mineral of arsenic, but as a by-product in the treatment of gold, silver, copper, and other metal ores. Environmental laws require that arsenic be removed from ores, so that it does not enter the environment in effluent gases, fluids, or solids.
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22.07.2017· Leaching of High-Grade Ore. The effects of NaOH concentration, oxygen pressure, temperature, reaction time, and percent solids on extraction of arsenic from ore A are given in table 4. The ore contains 61 pct arsenopyrite, and the stoichiometric NaOH for complete extraction of arsenic is 1.88 mol of NaOH per 100 g ore according to equation 1.
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Arsenic Removal from Arsenopyrite-Bearing Iron . Arsenic can be removed from arsenic-bearing ore by a roasting or sintering method due to the volatile nature of arsenic and its compounds ; thus, some scholars have explored the appropriate arsenic removal conditions by
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New Technology for Arsenic Removal from Mining Effluents. Journal of Materials Research and Technology, 2012. Jorge Langsch. Marcelo Fernandes Costa. Paulo Morais. Jorge Langsch. Marcelo Fernandes Costa. Paulo Morais. Download PDF. Download Full PDF Package. This paper. A short summary of this paper.
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Natural iron ores were tested as adsorbents for the removal of arsenic from contaminated water. Investigated parameters included pH, adsorbent dose, contact time, arsenic concentration and presence of interfering species. Iron ore containing mostly hematite was found to be very effective for arsenic
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2019-12-18· Arsenic contamination of drinking water is a serious water quality problem in many parts of the world. In this study, a low-cost manganese oxide ore from Vietnam (Vietnamese manganese oxide (VMO)) was firstly evaluated for its performance in arsenate (As(V)) removal from water. This material contains both Mn (25.6%) and Fe (16.1%) mainly in the form of cryptomelane and goethite minerals.
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But high arsenic-containing copper ore or concentrate has disadvantage environmentally and economically because arsenic is harmful and should be treated decently in metallurgical process. In this paper, the fundamental experiment for the elimination of arsenic from copper concentrate by volatilization process as sulfide using heat treatment is discussed.
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Arsenic can be removed from arsenic-bearing ore by a roasting or sintering method due to the volatile nature of arsenic and its compounds [12]; thus, some scholars have explored the appropriate arsenic removal conditions by performing roasting or sintering experiments.
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2017-05-25· The method based on oxidation-coagulation-adsorption at optimized pH (OCOP) using NaHCO 3, KMnO 4 and FeCl 3 as pH conditioner, oxidant and coagulant, respectively, is an efficient and low-cost method for removal of arsenic from groundwater that has been gaining popularity in India. In a recent modification of OCOP, coexisting ferrous iron of water was utilized in order to lower the dose of
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The milling process removed about 21 of the molybdenum and 53 of the arsenic initially present in the ore. time on extraction of arsenic from arsenopyrite need to be investigated. Once the ores are fully roasted, and the sulfur is driven off, the extraction of the gold or silver from the ore
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The Economics Of Removing Arsenic From Copper Concentrates –Demonstration of the process continues – new ores, optimising flowsheet, US$7.80 /lb As removed for smaller plants Concentrate Treated 2.5% As 40,000 tpa 200,000 tpa 400,000 tpa Opex
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A process and apparatus for the removal of arsenic values from an ore concentrate includes the steps of leaching the concentrate with a solution which dissolves the arsenic, separating undissolved residue therefrom, acidifying the arsenic pregnant solution to precipitate arsenic and other mineral values as insoluble salts and treating the arsenic barren solution to regenerate sulfur and sodium
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Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal.Arsenic is a metalloid.It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry.. The primary use of arsenic is in alloys of lead (for example, in car
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Nickel matte containing at least about 28% sulfur is refined with respect to arsenic, antimony or bismuth by contacting molten matte with gaseous chlorine to chlorinate and volatilize arsenic, antimony or bismuth from the nickel matte. Advantageously, the molten nickel matte is provided with a halide flux to minimize volatilization of any nickel chloride that is formed.
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[8] Arsenic can also be leached out of some metal ores by cyanide or acid rock drainage but can be captured and removed from wastewater before it is released into the environment. [12] Arsenic is also present in coal used to generate electricity. When coal is burned, ash is produced which contains most of the naturally occurring arsenic.
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A process and apparatus for the removal of arsenic values from an ore concentrate includes the steps of leaching the concentrate with a solution which dissolves the arsenic, separating undissolved residue therefrom, acidifying the arsenic pregnant solution to precipitate arsenic and other mineral values as insoluble salts and treating the arsenic barren solution to regenerate sulfur and sodium
Get PriceIn experiments using a chalcopyritic copper concentrate containing 2.2% arsenic as enargite, 94% of the arsenic was removed when the concentrate was baked at 85 °C for 10 min by using 2.5 times the stoichiometric Na 2 S requirement for arsenic dissolution. Copper dissolution was
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Ferrum manganese composite materials (1-3μm) had been successfully synthesized by low-cost ferruginous manganese ore in wet granulation to treat the arsenic wastewater effectively. The experiment showed when the cement content was 10%, the amount of saw dust was 5% and roasting temperature was 250°C, the composite materials was able to meet the demand of the particles strength and the
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11.04.2017· The mechanism of arsenic removal during a sintering process was investigated through experiments with a sintering pot and arsenic-bearing iron ore containing arsenopyrite; the corresponding chemical properties of the sinter were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), and scanning electron microscopy (SEM) coupled with
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Adsorption and removal of arsenic from water by iron ore mining waste Water Sci Technol. 2009;60(9):2301-8. doi: 10.2166/wst.2009.667. Authors Tien Vinh Nguyen 1, Thi Van Trang Nguyen, Tuan Linh Pham, Saravanamuth Vigneswaran, Huu Hao Ngo, J Kandasamy, Hong Khanh Nguyen, Duc Tho Nguyen. Affiliation 1 Faculty of
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