Arsenic

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.

Recovery of gold from sulfide refractory gold ore: Oxidation …

In view of this fact, arsenic (As) in the sulfide refractory gold ore can be removed preferentially prior to S by controlling the experimental conditions, such as roasting temperature and air flow rate. The benefit of this is that the formation of As 2 O 5 and FeAsO 4 is avoided and improving the removal efficiency of As. Moreover, it also ...

Arsenic | SpringerLink

Native arsenic is relatively rare, while the most common arsenic-bearing mineral is arsenopyrite, FeAsS, which is a ubiquitous component of many sulfidic ore deposits. Other common arsenic sulfides include orpiment As 2 S 3 (yellow), and realgar AsS (red/orange), which occur in hydrothermal veins and are particularly conspicuous in the highly ...

Arsenic removal from copper–silver ore by roasting in …

The copper ore was roasted in air, in nitrogen atmosphere and in vacuum at high temperature. It was found that arsenic was more easily removed in vacuum at lower temperature with shorter time. By ...

Study on thermal decomposition and arsenic removal of a …

The percentage of arsenic removed is 91.2% and the percentage of sulfur retained is 80.1%. The purpose of this paper is to explore a method to treat the silver bearing copper ore with high arsenic content (7.81% As) for feeding the smelter and to verify that the process route is thermodynamically feasible.

Arsenic Removal and Iron Recovery from Arsenic-Bearing …

Extracting iron while minimizing the health and environmental risks associated with arsenic contamination necessitates the removal of arsenic from …

STUDY ON REMOVAL OF COPPER, TIN AND ARSENIC FROM IRON ORE…

The experimental results revealed that the arsenic in arsenopyrite-bearing iron ore can be removed in the form of As2O3(g) in an air or nitrogen atmosphere by a roasting method.

Arsenic Removal from Arsenopyrite-Bearing Iron Ore and Arsenic …

Arsenic is removed in the form of As 2 O 3 (g) by the roasting method, and residual arsenic reacts with oxides in the ore to generate arsenates. (3) The arsenic recovery from dust ash by roasting in the atmosphere of an air or anaerobic atmosphere is difficult, and arsenic easily reacts with oxides to form arsenate and remains in the dust ash.

Solved Arsenic can be extracted from its ores by first

Arsenic can be extracted from its ores by first reacting the ore with oxygen (called roasting) to form solid As4O6, which is then reduced using carbon: As 4 O 6 (s) +6C (s) → As 4 (g) +6CO (g) Predict the direction of the shift of the equilibrium position in response to each of the following changes in conditions. Addition of carbon monoxide.

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) …

Removal of scorodite arsenic from gold ore in the form of …

Abstract. This paper discusses the removal of arsenic scorodite from the gold ore. Kinetic studies on the possibility of removal of arsenic in a compact shape of arsenic sulfide were carried out, which occupies a small volume. The reagent reaction order and activation energy are calculated. The limiting stage of the process occurred in the ...

Intro to Environmental Science Final Flashcards | Quizlet

Study with Quizlet and memorize flashcards containing terms like (Quiz 12) Gold can be removed from ore with a highly toxic chemical called _____ through a series of leaching operations., Some companies have been allowed to walk away from cleaning up their mining operations after extracting gold from a mine due to ____., Where do the majority …

Thermodynamics of arsenic removal from arsenic-bearing …

The effects of different atmosphere and temperature conditions on the equilibrium species and arsenic removal about arsenic-bearing ores from South of China were investigated by HSC Chemistry 5.0 thermodynamic analysis software.And some experiments were made to verify the thermodynamic analysis data.The results show that the increase of Ar and …

Review on arsenic removal from sulfide minerals: An …

Selective removal of arsenic from arsenic-bearing sulfide minerals has the following significance: (i) efficient development and utilization of resources; (ii) reduce …

Removal of arsenic from groundwater using low cost …

Abstract. A low cost ferruginous manganese ore (FMO) has been studied for the removal of arsenic from groundwater. The major mineral phases present in the FMO are pyrolusite and goethite. The studied FMO can adsorb both AS (III) and As (V) without any pre-treatment, adsorption of As (III) being stronger than that of As (V).

Arsenic Removal and Iron Recovery from Arsenic-Bearing …

There is a great quantity of iron ore with arsenic deposited in China, the reserves of which amount to 1.88 billion tons in the homeland as of 1990. ... (20–60 min), the roasted sample is swiftly removed and cooled with water. Utilizing a Davis tube (magnetic tube CXG-08SD, manufactured by Shida automation instrument technology Co., Ltd ...

Arsenic

Arsenic is a natural component of the earth's crust and is widely distributed throughout the environment in the air, water and land. It is highly toxic in its inorganic form. People are exposed to elevated levels of inorganic arsenic through drinking contaminated water, using contaminated water in food preparation and irrigation of food crops ...

The application and mechanism of iron sulfides in arsenic …

Over 99% of arsenic was removed from the smelting wastewater, containing 11.2 g/L of arsenic and 69 g/L of H 2 SO 4 under the optimal condition. Pyrite, moreover, is regarded as the seed crystal providing abundant nucleation sites for scorodite growth and crystallization during the reaction [30] .

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 …

Arsenic Removal from Arsenopyrite-Bearing Iron Ore …

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. Yin et al. and Lu et

Study on thermal decomposition and arsenic removal of a

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 ...

The Extraction of Copper

The method used to extract copper from its ores depends on the nature of the ore. Sulfide ores such as chalcopyrite ( CuFeS2 C u F e S 2) are converted to copper by a different method from silicate, carbonate or sulfate ores. Chalcopyrite (also known as copper pyrites) and similar sulfide ores are the commonest ores of copper.

Arsenic and cation metal removal from copper slag using a …

Copper is normally generated from copper ore through the hydrometallurgical process, in which a large amount of copper slag (CS) containing various heavy metals could be produced ... arsenic can be removed from the CS and recovered in the form of arsenic acid; 3) after treatment, the heavy metal speciation can be mainly observed in the form of ...

Assessment of health risks due to arsenic from iron ore lumps …

Abstract. In 2011, an artificial hook-shaped peninsula of 128 ha beach area was created along the Dutch coast, containing thousands of iron ore lumps, which include arsenic from natural origin. Elemental arsenic and inorganic arsenic induce a range of toxicological effects and has been classified as proven human carcinogens.

Environmental Science chapter 12 Flashcards | Quizlet

Sandstone. Study with Quizlet and memorize flashcards containing terms like Gold ore can be removed ore with a highly toxic chemical called cyanide through series of leaching operations., What kind of movement does the heat within the core and mantle direly generate?, The location of plate boundaries is most helpful is predicting the. and more.

Removal of Arsenic From Ground Water Using Low Cost Ferruginous

A low-cost ferruginous manganese ore (FMO) was studied for the 126 removal of arsenic from groundwater (Chakravarty, et al., 2002). The major mineral phases 127 present in the FMO were pyrolusite ...

Arsenic Removal from Arsenopyrite-Bearing Iron Ore and …

The experimental results revealed that the arsenic in arsenopyrite-bearing iron ore can be removed in the form of As 2 O 3 (g) in an air or nitrogen atmosphere by a roasting method. The efficiency of arsenic removal through roasting in air was found to …

Study on thermal decomposition and arsenic removal of a …

The percentage of arsenic removed is 91.2% and the percentage of sulfur retained is 80.1%. The purpose of this paper is to explore a method to treat the silver bearing copper ore with high arsenic content (7.81% As) for feeding the smelter and to verify that the process route is thermodynamically feasible. The feasibility of the process …

A review on sources, identification and treatment strategies for …

Ore reservoirs whereby Arsenic has been primarily found in sulphide resources like arsenopyrite and pyrite might have been correlated also with occurrence of metalloid in ... (> 125 g/mol). The amount of Arsenic removed was unaffected by applying pressure and a rise in feed water temperatures reduced Arsenic elimination by a tiny …

Review on arsenic removal from sulfide minerals: An …

Arsenic removed by Fe 3+ has two principles: (i) quick neutralization of Fe 3+ leads to the formation of ferrihydrite; (ii) Fe 3+ can react with AsO 4 3-to form FeAsO 4. ... Beneficiation of a gold bearing enargite ore by flotation and As leaching with Na-hypochlorite. Miner. Eng., 18 (8) (2005), pp. 849-854. View PDF View article View in ...

Mechanism research on arsenic removal from arsenopyrite …

The mechanism of arsenic removal during a sintering process was investigated through experiments with a sintering pot and arsenic-bearing iron ore …

Arsenic removal strategy in the processing of an …

An additional stage in the processing of an arsenopyritic refractory gold ore was studied. • As extraction in NaOH pretreatment was evaluated to avoid metalloid …

A critical review on arsenic removal from water using iron …

Overall, iron-based adsorbents offer significant potential towards developing adsorbents for arsenic removal from water. The recent developments on iron-based adsorbents such as iron oxyhydroxides nanoparticles, zero-valent iron, bimetallic oxides, and iron oxyhydroxide-doped composite materials are fully discussed in this review. Go …

Mining: Production and Control of Arsenic

Arsenic is a naturally occurring element commonly found as an impurity in sulfide-bearing mineral ores and volcanic rocks. Arsenic is widely distributed in rocks, soil, natural waters, and in small amounts in most living things. Arsenic is a critical mineral for a variety of uses, especially in gallium-arsenide semiconductors for solar cells ...

Leaching of molybdenum and arsenic from uranium ore and …

A sequential, selective extraction procedure was used to assess the effects of sulfuric acid milling on the geochemical associations of molybdenum and arsenic in a uranium ore blend, and the tailings derived therefrom. The milling process removed about 21% of the molybdenum and 53% of the arsenic initially present in the ore. While about one-half of …

Arsenic removal strategy in the processing of an …

In this study, an additional stage in the processing of an arsenopyritic refractory gold ore was studied. Arsenic extraction in an alkaline pretreatment was …

Arsenic removal from copper-silver ore by roasting in …

The copper ore was. e roasted in air, in nitrogen atmosphere and in vacuum at high temperature. It was found that arsenic was more easily removed in vacuum at lower temperature with shorter time. By suitably adjusting the main reaction conditions, almost 98.97% arsenic could be removed, while most of the sulfur was particularly retained in …

Arsenic Removal and Iron Recovery from Arsenic-Bearing …

This work aims to investigate the feasibility of recovering weak magnetic iron minerals and eliminate arsenic from arsenic-bearing iron ores through CMR-LMS technology, in …

A review of copper–arsenic mineral removal from

The common copper–arsenic bearing minerals in copper ores, enargite (Cu 3 AsS 4) and tennantite (Cu 12 As 4 S 13 ), contain significant amounts of copper; 48.4% and 51.6% respectively. Removal of these minerals from the concentrate removes valuable metal, hence income. There is a dearth of literature concerning the selective removal of ...

Extracting antimony from high arsenic and gold-containing stibnite ore

The cathode plate is periodically removed from the electrolytic cell and stripped to obtain metal antimony (Sb > 98%). Download : Download high-res image (151KB) Download : Download full-size image; Fig. 14. The flowsheet of SE for the extraction of antimony from the high arsenic and gold-containing stibnite ore.