Investigation has been carried out for arsenic removal from a silver bearing copper ore. The copper ore was roasted in nitrogen atmosphere (> 99%) at temperatures ranging from 923.15 K to1123.15 K. By suitably adjusting the main reaction conditions, nearly 98% arsenic was removed at 1053.15 K for 3 h in nitrogen atmosphere, while most of the ...
1.1.1 Arsenic-Containing Minerals. 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 lead. There are hundreds of arsenic minerals known in nature.
EXAFS fit parameters for solutions of arsenic salts and ore dissolution in 1ChCl:2EG. Solute ... The low dissolution rate for the arsenic containing minerals despite the small band gap seems to suggest the formation of a passivating species in the oxidation process, potentially elemental arsenic, which has been observed. ...
Arsenic appears to significantly decrease the rate of mineral dissolution. The reason for studying these 5 minerals is that they are problematic gangue minerals which can complicate the recovery of higher value technology metals, particularly through the …
In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds ...
Arsenic release and transport during oxidative dissolution of spatially-distributed sulfide minerals. J Hazard Mater. 2021 May 5;409:124651. doi: …
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 ...
In this study, an additional stage in the processing of an arsenopyritic refractory gold ore was studied. Arsenic extraction in an alkaline pretreatment was evaluated to avoid metalloid release in the subsequent gold thiosulfate leaching stage, without affecting precious metal extraction. Experiments were conducted with different …
Arsenic dissolution as a function of leaching time for enargite ore (sample (5)) with arsenic content of 8.32 wt.% and that of sample (5 + 2) blended mixture with arsenic content at 3.0 wt.%. Pulp density of mix sample was increased to 1000 g/L and leaching was conducted at 80 °C.
In order to elucidate the mechanism of asbolane dissolution, the laterite ore was incubated in sterile acidic growth medium under aerobic conditions, in the absence or presence of Fe 2+. After seven days incubation, Mn concentration in the absence of added ferrous iron was 7.4 ± 1.1 mg/L and 35.6 ± 0.3 mg/L when ferrous iron was added. ...
[8] The majority of the arsenic released by all sources end up in the soil and the ocean. [8] Since valuable metals such as copper and gold can also be found in sulfide mineral deposits, mining exploration companies will often look for soil and water with a naturally high arsenic content as a means of locating an ore body.
Some studies showed that the dissolution of Sb-bearing ore minerals is thought to contribute significantly to the Sb pollution in water draining zones. The kinetics of the mobilization of Sb from stibnite, Sb 3 O 6 OH and Sb 2 O 3 under environmental conditions has been studied in detail by Biver and Shotyk, 2012, Biver and Shotyk, 2013 .
Arsenopyrite is a hard metallic iron arsenic sulfide with steel gray to silver-white color, and the major source of arsenic. The mineral in purest form contains 46.0% As, 34.3% Fe, and 19.7% S, which turns it chemically toxic. The mineral is associated with sulfide orebodies and gold deposits. Arsenopyrite is the major source of arsenic ...
, Hongbo Zhao a b., Tatiana Abashina c., Mikhail Vainshtein c. Add to Mendeley. https://doi/10.1016/j.mineng.2021.107133 Get rights and content. …
The arsenic and iron removal ratios are higher in the presence of EG, indicating EG can promote the oxidative dissolution of arsenopytite and pyrite. Fig. 9 a Effect of ethylene glycol on removal ratios of arsenic and iron (H 2 SO 4 1.0 mol/L, H 2 O 2 2.0 mol/L, 30 min and 20 °C).
An alkaline pH, or the reduction of As(V) to As(III), released substantial proportions of arsenic into solution. Under moderately reduced soil conditions (0-100 mV), arsenic solubility was controlled by the dissolution of iron oxyhydroxides. Arsenic was coprecipitated (as As(V)) with iron oxyhydroxides and released upon their solubilization.
New approaches based on direct oxidative/reductive dissolution of As from enargite could result in significant contributions to Cu biohydrometallurgy. ... Baglin, E. Biooxidation of an arsenic-bearing refractory gold ore. Miner. Eng. 1995, 8, 147–158. [Google Scholar] Breed, A.W.; Glatz, A.; Hansford, G.S.; Harrison, S.T.L. The effect of As ...
Arsenic poses an environmental and human health threat to people in gold mining communities in Ghana. Over the years, limited studies have documented the sources and occurrence of As from gold mining spoils (Table 4.1 ), and these studies have mainly focused on the southwestern mining region of the country.
Reduction of groundwater is the main mechanism causing the dissolution of arsenic in Cenozoic aquifers; the major host phase is iron oxyhydroxides/oxides ... Typically, during chemical weathering of arsenic ore deposits and subsequent soil formation, arsenic host phases change as follows: arsenopyrite and löllinite in the ore …
In this manner, the dissolution of arsenic is improved, with only a slight decrease in the the gold extraction (1,6%) and without contamination of the thiosulfate …
Arsenic is dispersed widely in nature and is the 47 th most abundant element among the 88 known natural elements. The average crustal abundance is 1.5 ppm, with higher concentrations in reduced shales and coals. It is concentrated in many metal-bearing mineral deposits being a chalcophile element. It occurs in many metallic deposits …
In most cases, the release of arsenic from sediment was caused by microbial reductive dissolution of arsenic-bearing iron (III) minerals with organic …
1.3.1 Arsenosulfides. Arsenopyrite (FeAsS), orpiment (As2 S 3 ), and realgar (AsS/As 4 S 4) are the most common arsenic sulfide minerals, occurring primarily in hydrothermal and magmatic ore deposits. Arsenic is commonly found in sulfide-bearing mineral deposits, especially with gold mineralization. Orpiment, due to its golden color, was used ...
Methane can increase groundwater arsenic contamination by triggering the dissolution of arsenic-bearing iron oxide minerals by methane-oxidizing microorganisms, according to microcosm experiments ...
This study investigated whether arsenopyrite (FeAsS), the principal arsenic ore, undergoes oxidation–dissolution at a rate that is relevant to crop growth, and evaluated the availability of the ...
The formation of arsenic-bearing acid mine drainage (AMD) via the oxidation of arsenopyrite refuse ore has attracted significant attention. Pyrite, as main a concomitant mineral, is a crucial factor that affects the (bio)dissolution of arsenopyrite, but there are still some points on the detailed action mechanism under normal environmental conditions …
Dissolution of Arsenic in the Environment. Authors: Muhammad Hanif Salim. Murdoch University. Abstract and Figures. Arsenolite (As2O3) and scorodite …
Dissolution and the release of minerals containing arsenic into the groundwater are the major natural sources of arsenic. In nature, arsenic is mainly present in ore mineral products and arsenopyrite FeAsS accounts for the largest proportion of arsenic-enriched ores, following the realgar AsS or orpiment As 2 S 3 (Siddiq et al. …
Arsenolite (As 2O 3) is generally regarded as highly soluble; solubility studies show that arsenolite dissolution can yield 12 g/L dissolved As. Our empirical observations have …
