The first method is called Arsenic Removal Using Bottom Ash (ARUBA). Bottom ash, a widely available waste material from coal-fired power plants, is coated with iron rust, which binds to arsenic. The arsenic can then be removed from the water through settling and/or filtration. The second method is called ElectroChemical Arsenic Remediation (ECAR).
The harmful components of ore, such as arsenic, are increasing year by year and decreasing the copper grade, therefore there is a strong need to improve the separation of arsenic from copper ore. The effect of grinding as a result of chemical activation caused by mechanochemical treatment was evaluated by XRD and X-ray absorption spectroscopy ...
It was found that sulphidization roasting of oxidized scorodite‑gold ore helps to remove scorodite arsenic in the sulfide form, which is safe. Removal of arsenic in sulfide form from …
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 …
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 sulfur was particularly retained …
Arsenic bearing minerals such as enargite (Cu 3 AsS 4) are a rich source of copper. Enargite contains 48 wt% of copper, compared to chalcopyrite (CuFS 2) which contains 34 wt% copper. In addition, any separation of arsenic bearing minerals from copper ones will result in some copper non-arsenic bearing species reporting to the high arsenic ...
The arsenic content of copper ore for smelting is increasing in recent years. ... A sharp decrease of residual arsenic in the sample was observed around 873 to 923 K and almost all arsenic was removed by volatilization from the sample over 973 K. Residual arsenic content in the sample was 0.019 wt% at 973 K and 0.004 wt% at 1173 K. XAFS ...
There is a global need to develop low-cost technologies to remove arsenic from water for individual water supply. In this study, a purified and enriched waste material (treated magnetite waste, TMW) from the Trai Cau's iron ore mine in the Thai Nguyen Province in Vietnam was examined for its capacity to remove arsenic.
Over 90% of arsenic in the starting materials was removed within 1–3 h for materials with arsenic content from 1 to 4 wt.% and within 3–6 h for materials with arsenic content over 4–10 wt.%.
Removal and recovery of high levels of arsenic (As) in copper smelting wastewater present a great environmental challenge. A novel approach was investigated for the first time using TiO 2 for As adsorptive removal from wastewater and subsequent spent adsorbent regeneration and As recovery using NaOH.
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 the copper ore. It was …
the mechanism of arsenic removal during a sintering process was investigated through experiments with a sintering pot and arsenic-bearing iron ore containing arsenopyrite; …
Accordingly, up to 98% of arsenic was removed under optimum selective leaching conditions (30 g/L of sulfide sodium, 5 g/L of sodium hydroxide, at 85 °C, 15 min, and L/S ratio = 7). To immobilize arsenic from alkaline leaching, the precipitation method was used by finding optimum conditions (at Fe/As = 3, 25 °C and 12 h).
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 …
About half achieved the WHO standard of 10 µg/L. * 14 technologies tested at the or community level (in Argentina, Bangladesh, Chile, China, India, and Nicaragua) achieved arsenic removal efficiency levels …
Instrumental analysis indicated that efficient arsenic removal onto natural ferruginous manganese ore was due to the combination of the oxidation of manganese, complexation of ferric hydroxide and the adsorption of ·OH on the manganese ore. Keywords: Arsenic Natural ferruginous manganese ore Adsorption Mechanism
There is a global need to develop low-cost technologies to remove arsenic from water for individual water supply. In this study, a purified and enriched waste material …
The results showed that the most important digestion variables were temperature and concentrations of NaHS and NaOH. Over 97% of arsenic and 92% of antimony could be removed in 10 min of digestion using 8.9 M NaOH and excess of NaHS at 80 °C. The subsequent water leaching was performed at 80°C for 20 min. Keywords Arsenic removal NaHS-NaOH
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...
Desorption of arsenic followed by regeneration of sorbents has been discussed. Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates. Arsenic concentrate treatment and disposal obtained is briefly addressed. This issue is very important but much less discussed. Publication types
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. Table 4 indicates that more than stoichiometric NaOH was …
Steady-state experiments were conducted on arsenic (V) removal from contaminated groundwater using two different grades of bauxite ore, with RB found to be the better adsorbent compared to FB, and the kinetics of the As (V) adsorption could be best explained by pseudo-second-order rate equation. Expand 6 View 3 excerpts, cites background Save Alert
The Balkhash Mining-Metallurgical Combine (USSR) have since introduced a process for removing arsenic from copper electrolysis solutions (27) by precipitating TiOHAsO4 and a method for "regenerating" a "sorbent" (which …
Figure 2.2 indicates that the arsenic removal efficiency in the absence of chlorine increases steeply from 15% to 80% as the pH changes from 9 to 11 when the arsenic concentration of …
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 …
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. The...
The results indicated that the arsenic compound changed from sulfide, in the original sample, to oxide after grinding. As a result of oxidation, the arsenic was easy to dissolve in a water and alkaline solution, and optimized …
Silica usually being present in the furnace-charge, arsenic may be eliminated by this action. Ter-sulphides of arsenic and bismuth remaining in the calcined ore may be volatilized when heated to the smelting temperature. …
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 …
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 …