In the gold mining industry, the exploitation of low-grade refractory deposits generates effluents with high arsenic concentrations. In this study, an additional stage in the processing of an ...
Arsenic, a metalloid that exists by nature, reaches the earth either by natural or anthropogenic events and is considered an emerging pollutant. The existence of arsenic in soil systems is a fate to the environment since it is mobile and being transported to other systems because of its bioavailability and speciation process. Arsenic transformation in …
The removal of arsenic from acidic aqueous conditions is usually achieved in mineral processing and metallurgical operations using lime. This strategy used by some mining companies for arsenic removal focuses on the formation of As 5+, a less toxic chemical species, providing improved environmental outcomes compared with As 3+.
Environmental contamination of arsenic has occurred at historic mine sites in Canada [23,33,61] and around the world [13,35,42]. Many of these mines were in operation when government regulations ...
Arsenic (As) concentrations in soils and waste material in two areas of former As mining and processing: Złoty Stok (Złote Mts.) and Zeleźniak (Kaczawskie Mts.), SW Poland, were measured to assess levels and environmental risk associated with possible increases in arsenic mobility under changing pH …
In this study, high levels of arsenic were found in soil samples and in the waters of the Rico stream, which were influenced by seasonal variation and by proximity to the gold mine, indicating that although the region's soil is rich in arsenic minerals such as arsenopyrite, processing has a great influence on the dispersion of this semimetal ...
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 …
The results of a study on the spatial distribution of arsenic in topsoil (0-5 cm) over the K. Mitrovica region, Kosovo, are reported. The investigated region (300 km(2)) was covered by a sampling ...
This is a former arsenic xide mine and processing plant that closed in 2000 . An estimated 50,000 tons of arsenic residue and 500 tons of rock remain on the site, covering an area of around 53,000 m 2. The site is located at the head of a valley about 5 kilometers (km) upstream from the nearest village.
Arsenic poisoning is a global health issue affecting millions of people worldwide through environmental and occupational exposure, as well as intentional suicide and homicide attempts. Although arsenic …
Mining: Production and Control of Arsenic September 2022 Arsenic is a naturally occurring element found in many rocks and minerals in the earth's crust. It is also classified ... The mining, mineral processing and metallurgical …
The primary anthropogenic sources of arsenic include mining and smelting, farming practices 2 and fossil fuel combustion 3. ... After the initial screening process, we proceeded to extract data ...
Arsenic (As)-contaminated gold mine waste is a global problem and poses a significant risk to the ecosystem and community (e.g., carcinogenic, toxicity). Arsenic concentrations of 77,000 mg/kg and 22,000 mg/kg in mine waste have been reported for Canada and Australia, respectively. Research is investigating environmentally …
The Role of Arsenic in the Mining Industry . The purpose of this briefing is to provide a general overview about the occurrences of arsenic, its economic uses, and its environmental and health impacts. ... order to distinguish between mining, mineral processing, and the metallurgical industries; other human contamination (pesticides, …
This process allows gold to be stabilized in the mineral. However, when the arsenic concentration is low, gold doesn't enter the mineral structure but only forms weak gold-sulphur bonds with the ...
In most cases, arsenic is an unfavorable element in metallurgical processes. The mechanism of arsenic removal was investigated through roasting experiments performed on arsenopyrite-bearing iron ore. Thermodynamic calculation of arsenic recovery was carried out by FactSage 7.0 software (Thermfact/CRCT, Montreal, …
An additional stage in the processing of an arsenopyritic refractory gold ore was studied. • As extraction in NaOH pretreatment was evaluated to avoid metalloid release in the subsequent gold leaching. • Gold, extractions were related to arsenic removal. • It is possible to remove arsenic without altering the subsequent release of gold ...
DOI: 10.1016/S1875-1121(06)09016-X Corpus ID: 140148438; Arsenic in soils in the areas of former mining and mineral processing in Lower Silesia, southwestern Poland @article{Karczewska2007ArsenicIS, title={Arsenic in soils in the areas of former mining and mineral processing in Lower Silesia, southwestern Poland}, author={Anna …
The results of a study on the spatial distribution of arsenic in topsoil (0–5 cm) over the K. Mitrovica region, Kosovo, are reported. The investigated region (300 km2) was covered by a sampling grid of 1.4 km × 1.4 km. In total, 159 soil samples were collected from 149 locations. Inductively coupled plasma–mass spectrometry (ICP-MS) was applied for the …
The case of the Giant mine illustrates how a large, long-lived Au mine has resulted in a complex regional legacy of As contamination and an estimated remediation cost of almost one billion Canadian dollars (AANDC 2012). The mine, located a few km north of the city of Yellowknife on the shore of Great Slave Lake (Figs. 1, 2) produced more than 7 million …
It is well known that microorganisms can dissolve different minerals and use them as sources of nutrients and energy. The majority of rock minerals are rich in vital elements (e.g., P, Fe, S, Mg and Mo), but some may also contain toxic metals or metalloids, like arsenic. The toxicity of arsenic is disclosed after the dissolution of the mineral, …
Here, the release risks of Tl and As from both NESRs and AESRs in a typical Tl As sulfide mining area were investigated. In a single leaching process, AESRs released 10.4 % of total Tl (157 μg L −1) and 32.5 % of total As (4089 μg L −1), 2–3 orders of magnitude higher than NESRs. Prolonged multiple leaching tests revealed notable and ...
1. Introduction. Regularly characterized by high solubility and significant toxicity at low concentrations, arsenic (As) is highly toxic [1], [2], [3].Statistics show that China has ∼71 of arsenic reserves worldwide [4], and over 30 Mt of arsenic waste are created each year from mining processing of Cu/Pb/Zn ores [5].Arsenic typically …
Arsenic has become a worldwide environmental challenge in the metals and mining industry. Hence, arsenic in the process streams must be immobilized properly prior to the discard of waste. The initial step for arsenic fixation is the oxidation of trivalent arsenic in order to improve both arsenic removal and stability of the final arsenical ...
Arsenic has become a worldwide environmental challenge in the metals and mining industry. Hence, arsenic in the process streams must be immobilized properly …
Arsenic is a naturally occurring element commonly found as an impurity in metal ores, and is produced commercially for use in pesticides, wood preservatives, and metal alloys. …
Arsenic-containing process water was internally recycled at local wood treatment plants where chromated copper arsenate (CCA) was used2. SME supports increased recycling …
The results of a study on the spatial distribution of arsenic in topsoil (0-5 cm) over the K. Mitrovica region, Kosovo, are reported. The investigated region (300 km(2)) was covered by a sampling grid of 1.4 km × 1.4 km. ... Arsenic in surface soils affected by mining and metallurgical processing in K. Mitrovica region, Kosovo Int J Environ ...
Microbial arsenic transformations play essential roles in controlling pollution and ameliorating risk. This study combined high-throughput sequencing and PCR-based approaches targeting both the 16 S rRNA and arsenic functional genes to investigate the temporal and spatial dynamics of the soil microbiomes impacted by high arsenic …
Arsenic is a poisonous element found within minerals at many of the world's copper mines. As a consequence of sulphide ore …
Arsenic may, however, accumulate in soils not only from natural, but also from anthropogenic sources, such as mining the As-rich metal ores, air-borne emissions and waste discharges from metal processing facilities, and burning of fossil fuels, as well as use of wood-preservatives and agricultural application of arsenical pesticides (Adriano ...
People involved in the mining, processing or smelting of arsenic ores and people involved in the manufacture or use of arsenic-containing pesticides often inhaled arsenic on the job. Their risk of developing lung cancer was high, and even higher if they also smoked cigarettes. Tobacco itself contained high levels of arsenic until recently, due ...
Arsenic in dust and aerosol generated by mining, mineral processing and metallurgical extraction industries, is a serious threat to human populations throughout the world. Major sources of contamination include smelting operations, coal combustion, hard rock mining, as well as their associated waste products, including fly ash, mine wastes …
Bulk chemical analysis results of the arsenic-gypsum solids coprecipitated at different pHs and initial arsenic concentrations before and after ascorbic acid treatments are shown in Fig. 1.Arsenic content in the coprecipitated solid (black legends) was highly dependent on the precipitation pH and aqueous arsenic concentration.
DST has also successfully demonstrated its GLASSLOCK arsenic stabilization process at an operating copper smelter in Namibia and is now finalizing the detailed engineering for a GLASSLOCK circuit ...
Introduction. Arsenic (33 As) is a metalloid contained at an average concentration of 1.5 ppm in the Earth's crust, consisting of the 53rd most abundant …
The study of the geochemical behavior of arsenic in mining areas and the microbial remediation of arsenic pollution have great potential and are hot spots for the prevention and remediation of arsenic pollution. ... (mining waste rocks, tailings, and smelting slag) produced in the process of ore mining, beneficiation, and smelting. The …