قائمة الطعام
The results showed that sufficiently stable crystal scorodite could be achieved under the condition of initial arsenic concentration of 10 g/L, pH 3.0–4.0, …
In this paper, a scheme is proposed for the treatment of arsenic-containing lead slime by the combination of acid pressure oxidation leaching and forming scorodite. On the basis of thermodynamic calculations, the effects of six factors including acid concentration, oxygen partial pressure (pO2), liquid to solid ratio (L/S), agitating …
The results showed that the residual arsenic content is 0.32–0.19%, and the removal rate of arsenic is 84.87–91.90% at 1153 K and the range of holding time is …
Tin anode slime (TAS) is a high-value waste produced by electrolytic refining of crude tin. In order to reduce the discharge of harmful waste and realize rational recycling, a process of removing arsenic from TAS by vacuum distillation was proposed, and theoretical and experimental studies were carried out. The saturated vapor pressure of …
The project supports the Anderson Dam Seismic Retrofit Project's construction of an outlet tunnel next to the dam, allowing more water to be released during a storm or other emergency. If you have questions about the project, please contact neighborhood liaison Tony Mercado at tmercado@valleywater or 408-630-2342.
The maximum increase in water level was found to be 3.46 m, 2.54 m and 4.7 m respectively for the check dam, percolation pond with three percolation wells and combined structure arrangement after 2 years of artificial recharge. The zone of influence was obtained as 400 m, 600 m and 500 m respectively for the check dam, percolation …
Anode slime is an important material of recycling precious metals. Up to now, treating the arsenic- and antimony-rich anode slime by conventional processes has the following problems: its economic and environmental effect is less than satisfactory, and the removal effect of arsenic and antimony from anode slime in present processes is …
Both of these types of mine dumps have problems in contaminated run-off and percolation to groundwater. The. ... both at the abandoned slimes dam and at the active slimes dam. The extremely high levels of arsenic are a particular cause for concern. DISCUSSION Results suggest four principal challenges to water quality management in the ...
Testing the rice before and after cooking showed that coffee-pot percolation removed about half the arsenic, and that the lab apparatus removed around 60–70%. In some cases, the technique ...
pH plays an important role in scorodite formation in arsenic leaching solution of anode slime. Scorodite can be produced at pH lower than 5.0. High-crystalline scorodite can be obtained in the ...
1. Introduction. Arsenic contamination in groundwater has risen to alarming levels around the world [1], [2].Chronic intake of arsenic-contaminated drinking water in excess of 0.01 mg L −1 (WHO standard) has major health repercussions since it causes skin lesions, high blood pressure, diabetes, bladder and lung cancer, and non …
Abstract: This present study investigated the issue of gold mine tailings dams as a potential source of arsenic and other trace elements contamination and their dissolution into the adjoining environmental media in Obuasi Municipality of Ghana. One active (Sanso tailings dam) and two abandoned (Pompora and Dokyiwa) mine
Under the optimal conditions, the leaching rate of arsenic from lead slime reached 99.10% and the arsenic content of the leaching residue was about 0.80%. After a decontamination procedure, the ...
Panthi G, Choi J, Jeong S-W. Evaluation of Long-Term Leaching of Arsenic from Arsenic Contaminated and Stabilized Soil Using the Percolation Column Test. Applied Sciences . 2021; …
A process was proposed for removing and stabilizing arsenic (As) from anode slime. The anode slime with high arsenic concentration was pretreated by circular alkaline leaching process. Then, the arsenic in the leaching solution can be further precipitated as a form of scorodite crystalline (FeAsO 4 ·2H 2 O). In the precipitating …
The aim of the present study is to selectively extract antimony and arsenic from decopperization slime through alkaline sulfide hydrometallurgy with a view to recycle the obtained solid residue ...
The results demonstrated that AA adsorption dams could be applied for emergency treatments of small- or medium-sized rivers contaminated with As and met the discharge requirement of the Surface Water Quality Standards criteria III in China. A batch of lab-based adsorption experiments were performed to investigate the arsenic (As) …
Herein, we present a method to separate arsenic from lead slime and stabilize arsenic by forming scorodite. The results indicate that initial pH plays an important role.
Abstract. A process was proposed for removing and stabilizing arsenic (As) from anode slime. The anode slime with high arsenic concentration was pretreated by circular alkaline leaching process. Then, the arsenic in the leaching solution can be further precipitated as a form of scorodite crystalline (FeAsO 4 ·2H 2 O).
Volatiles such as As 2 O 3, PbS, and BiSe were placed in lead smelting plants, and the Ag and Au in the residue were placed in copper anode slime for extraction of precious metals, which greatly improved the efficiencies for recovering valuable metals from anode slime and avoided emission of arsenic-containing waste gas and wastewater.
Under the optimal conditions, the leaching rate of arsenic from lead slime reached 99.10% and the arsenic content of the leaching residue was about 0.80%. After a decontamination procedure, the ...
In this study, a new technology was proposed for removing and stabilizing arsenic from anode slime. The anode slime with high arsenic concentration was …
Therefore, an effective and clean pretreatment method for selectively separating arsenic from scrap copper anode slime containing high arsenic and tin via oxygen-enriched roasting followed by acid leaching was proposed. The volatilization rate of arsenic was only 1.13% under the optimum oxygen-enriched roasting parameters. The …
Study with Quizlet and memorize flashcards containing terms like An artesian well occurs when _____. an aquifer is trapped under pressure between two layers that are less permeable a water-bearing porous layer of rock, sand, or gravel has accumulated groundwater over a long period of time there are several aquifers that have merged …
Therefore, a new technology for treating arsenic-rich anode slime was proposed in this paper, namely the two-step process of vacuum dynamic evaporation (VDE) and vacuum dynamic flash reduction (VDFR).
The aim of the present study is to selectively extract antimony and arsenic from decopperization slime through alkaline sulfide hydrometallurgy with a view to recycle the obtained solid residue within the copper smelter, and also regenerate the sulfide lixiviant during the process. Rechtschaffner experimental design was used to evaluate the joint …
On the other hand, available arsenic content in soil decreased with increasing dose of iron slime. Available arsenic concentration in soil is declined by 34.6, 45.9 and 46.7% from their respective ...
Under the optimal conditions, the leaching rate of arsenic from lead slime reached 99.10% and the arsenic content of the leaching residue was about 0.80%. After a decontamination procedure, the ...
The main aims of percolation tanks are to reserve surface runoff from the catchments and stabilize the percolation process of the stored water into the soil sub-strata with a view to increasing ...
A cleaning process, including the steps of alkaline leaching, precipitation of lead and stabilization of arsenic, was proposed for separation of arsenic from lead anode slime generated in lead smelter before valuable metals recycling.
حقوق النشر ©2000- 2024 شركة شنغهاي زينيث
