Arsenic
Arsenic is a metalloid element, which, like phosphorus, has two main forms. One is a brittle, gray metallic form and the other is a yellow, non-metallic solid. Yellow arsenic is the more reactive and unstable of the pair. Arsenic is stable, being unaffected by air, water, most acids and alkalis. Arsenic has no liquid phase; the solid sublimes ...
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Mechanism and kinetics of ultrasound enhanced …
1.Introduction. Arsenic is a highly toxic element, which is often associated with valuable metallic minerals such as lead–zinc ore, arsenopyrite, pyrite and water-arsenic zinc ore in nature [1], [2].During mineral extraction and metallurgical processing, …
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Separation and stabilization of arsenic in copper
This study proposes a strategy of using zinc slag to treat CSW from copper smelting. The Fe (Ⅱ) provided by the zinc slag as an in-situ iron donor is oxidized to Fe (Ⅲ) by H 2 O 2. Most of the arsenate is co-precipitated with Fe (Ⅲ), and a small amount of arsenic and ferrihydrite is fixed by complex adsorption.
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Zinc (Zn) Ore | Properties, Formation, Minerals, …
Zinc ore refers to the naturally occurring rock or mineral that contains a significant concentration of zinc. Zinc is a chemical element with the symbol Zn and atomic number 30. It is a bluish-white, lustrous metal …
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The application and mechanism of iron sulfides in arsenic …
1. Introduction. Arsenic is a ubiquitous metalloid element, mainly in the form of different compounds in nature. Arsenic compounds can exist in the soil, sediments, and water and have been characterized as group 1 carcinogens by the International Agency for Research on Cancer (IARC) due to their high toxicity [1], [2].The ecotoxicological studies …
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Chemistry of Arsenic
The cubic form is slightly soluble in water. The solubility of arsenic trioxide in 100 g of water is 1.2 g at 0° C, 2.1 g at 25° C, and 5.6 g at 75° C. It is claimed that the aqueous solutions have a sweet, metallic taste. 664 The rate of dissolution is very low, and several weeks are required to achieve equilibrium.
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Studies on the leaching of an arsenic–uranium ore
With sulfuric acid at a concentration of 180 kg/t ore, complete recovery of both uranium and arsenic was achieved giving undesirable arsenic in the leach liquor. The maximum recovery of uranium and arsenic by leaching with sodium sulfide was only 20% and 18%, respectively. However, 3 M ferric chloride leached approximately 92% U (VI) …
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Determination of arsenic speciation in secondary zinc oxide and arsenic
The species of arsenic in secondary zinc oxide generated from fuming furnace were investigated. The results revealed that there are mainly three types of secondary zinc oxide based on three arsenic species. The main phase of As is As 2 O 3 in type I, zinc arsenite (Zn (AsO 2) 2) in type II and lead arsenate (Pb (As 2 O 6 ), Pb 4 As …
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Arsenic Data Sheet
World Resources: Arsenic may be obtained from copper, gold, and lead smelter flue dust, as well as from roasting arsenopyrite, the most abundant ore mineral of arsenic. Arsenic has been recovered from orpiment and realgar in China, Peru, and the Philippines; has been recovered from copper-gold ores in Chile; and was associated with gold
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Heterotrophic Bacterial Leaching of Zinc and Arsenic from …
Artificial adamite [Zn2(AsO4)(OH)] is a convenient structural model because it is isostructural with other rock-forming minerals in secondary ore deposits formed in cementation zones. Microbial activity in these zones accelerates mineral biogeochemical deterioration and metal release, and our results confirmed that Pseudomonas, …
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A review of copper–arsenic mineral removal from
Hintikka and Leppinen (1995) tested a copper-lead–zinc ore and reported that optimum flotation of copper from this ore was at about 0 mV SHE. Tests on a copper–gold ore containing arsenopyrite indicated arsenic recovery reached a maximum at +150 mV SHE and dropped off over +200 mV SHE. Copper recovery remained high, indicating a …
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Methods for the Determination of Arsenic in Metallurgical …
Pillai et al. proposed a sensitive spectrophotometric method for determining arsenic in various samples, including zinc ores. The method is based on the decoloration of the pinkish-red dye Rhodamine B upon the action of iodine, which is released in the reaction of potassium iodide with arsenic in a slightly acidic medium. ... including ore …
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Arsenic Distribution and Pollution Characteristics
Arsenic comprises about 2–5 mg kg −1 of the Earth's crust. As a compound with other elements such as oxygen, chlorine, and sulfur, arsenic is widely distributed in minerals and ores that contain copper or …
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Source profiling of arsenic and heavy metals in the Selangor …
Arsenic and 5 heavy metals (nickel, copper, zinc, cadmium and lead) were quantitated in surface water (n = 18) and soil/ore samples (n = 45) collected from 5 land uses (oil palm converted from forest, oil palm in peat swamp, bare land, quarry and forest) in the Selangor River basin by inductively coupled plasma mass spectrometry (ICP-MS).
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Sulfuric Acid Leaching of High-Arsenic Dust from Copper Smelting …
Reduction smelting has been carried out in shaft furnaces and ore-roasting furnaces [2, 3], yielding polymetallic mattes and dust with a high arsenic content. ... During leaching, an attempt was made to extract as much arsenic, zinc, and copper in the solution and obtain a cake suitable for lead production. A series of tests was performed to ...
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Arsenic
Arsenic with magnesium, manganese and zinc forms the silicate Mcgovernite. Arsenic is used with lead (0.5% As) in making lead shot. It makes the metal harder than the pure lead and improves the properties of the molten material. The shot is formed by pouring the molten material through a screen at the top of a tower and allowing it to solidify ...
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Distribution of Arsenic in the Environment
Arsenic in Sedimentary Rocks . It should be noted that a higher than average content of arsenic is commonly found in sandstones, shales, and coals associated with uranium …
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Mixed sulphide–oxide lead and zinc ores: Problems …
In Iran, mixed sulphide–oxide lead and zinc ores comprise about 10% of all the country's lead and zinc resources. There is great potential to exploit many well …
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Arsenic Removal from Lead Concentrate-Containing …
Arsenic is one of the most hazardous pollutants for both environment and human health [1, 2], generated from the mining activity for processing of different ores such as lead, zinc, copper, gold, and nickel [3,4,5].Therefore, arsenic should be captured and stabilized by strict control to prevent any destructive effects in the environment [6, 7].As a …
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Mechanism and kinetics of ultrasound enhanced removal of arsenic …
Arsenic is a highly toxic element, which is often associated with valuable metallic minerals such as lead–zinc ore, arsenopyrite, pyrite and water-arsenic zinc ore in nature [1], [2]. During mineral extraction and metallurgical processing, significant quantities of arsenic-containing slag and soot are generated [3].
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Improvement of processing technology for rebellious …
Carlin-type gold ore was a typical kind of refractory gold ore, characterized by low grade, generally finely trapped in pyrite and arsenopyrite, high sulfur and arsenic in flotation concentrate ...
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CERCLA IMMINENT HAZARD
environment. arsenic, and lead. Build up of radon gas. Eagle Mine CO Copper, silver, and zinc NA Contaminated with heavy Contaminated Wind-blown particles Fish populations have mining. Zinc ore metals. with heavy from a tailings pile declined in the river near roasting. metals. threatens nearby middle the mine. Soils school. contaminated with ...
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Arsenic Removal from Lead Concentrate-Containing …
Arsenic is one of the most hazardous pollutants for both environment and human health [ 1, 2 ], generated from the mining activity for processing of different ores …
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Lead and Zinc Smelting
the type of ore used as a charge. In the pyromet-allurgical process, ore concentrate containing lead, zinc, or both is fed, in some cases after sin-tering, into a primary smelter. Lead concentra-tions can be 50–70%, and the sulfur content of sulfidic ores is in the range of 15–20%. Zinc con-centration is in the range of 40–60%, with sulfur
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Characterization of arsenic oxidation and uranium
Therefore, the recovery of isolates with the potent ability to resist and oxidize As from U ore might play an important role in toxic metal bioremediation including U. Keywords Uraniumore .Arsenic-resistantbacteria .Arsenicoxidation .Uraniumremoval .16SrRNAgene .Bioremediation Introduction Uranium (U) and arsenic (As) are naturally occurring ele-
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Arsenic Distribution and Pollution Characteristics
Arsenic is abundant in the earth's crust and has been found in more than 300 minerals in nature. As a compound with other elements such as oxygen, chlorine, and sulfur, arsenic is widely distributed in minerals and ores that contain copper or lead. ... In the smelting of copper or lead–zinc ore, larger amounts of acidic wastewater are ...
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Zinc Ore
Zinc is used for the galvanising process, to protect steel in construction, transportation and products. It is also used as an alloying element with copper. Zinc is produced from ore …
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Arsenic Toxicity: Where is Arsenic Found?
Arsenic is released into the air by volcanoes, through weathering of arsenic-containing minerals and ores, and by commercial or industrial processes. Arsenic occurs naturally in the earth's crust, and much of its …
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Sphalerite: The primary ore of zinc and a collector's gem.
Sphalerite is the most commonly encountered zinc mineral and the world's most important ore of zinc. ... Minor amounts of manganese and arsenic can also be present in sphalerite. Sphalerite crystals: Gem-quality crystals of yellow sphalerite from the Balmat-Edwards Zinc District of New York. Specimen is about 2.75 x 1.75 x 1.5 centimeters in size.
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Pollution Source Distribution of Arsenic in the Typical …
The percentage of arsenic in SZO distributed in F1 is 8.99%, and it is classified in the low-risk category. Sample S, MS2, and WS with arsenic in F1 of 8.57%, 8.42%, and 1.70%, respectively, are categorized as low risk to the environment and MS1 with 0.84% of arsenic in F1 as no risk.
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