A new alkaline oxidative pressure leaching process was developed to remove arsenic from arsenic and antimony bearing dusts. The effect of NaOH concentration, oxygen partial pressure, temperature, liquid/solid ratio and reaction time on the leaching of arsenic, antimony and lead were investigated. It was found that > 95% of arsenic was ...
We describe a simple and efficient method for solid phase extraction and speciation of trace quantities of arsenic. It is based on the use of functionalized aluminum oxide nanoparticles and does not require any oxidation or reduction steps. The experimental parameters affecting extraction and quantitation were optimized using fractional factorial design methods. Adsorbed arsenic was eluted ...
inorganic arsenic, antimony, arsine gas, stibine gas, benzene soluble poly nuclear aromatic hydrocarbons (PNAH) and sulfuric acid. Lead, antimony, and trace quantities of arsenic are grid materials. Carbon black (which may carry PNAH) is a trace additive to paste. Arsine, stibine and sulfuric
Arsenic Removal Media contains iron oxide based selective resin media. It is a nano-particle based selective resin media designed to remove arsenic (arsenate and arsenite) from water. No backwash is required, will work on both Arsenic III and V in a wide range of …
Arsenic (As) and antimony (Sb) have numerous applications, including the manufacture of plastics, batteries, flame retardants and semiconductor materials [1,2,3].A recent research survey [] indicated that the global annual consumption of Sb was 188,000 tons, about fivefold more than that of As.As a result, anthropogenic emission causes As and Sb concentrations in soils and waters that greatly ...
Process for the removal of arsenic, antimony, tin and other acid oxide producing impurities from copper Download PDF Info Publication number US3262773A. US3262773A US25938563A US3262773A US 3262773 A US3262773 A US 3262773A US 25938563 A US25938563 A US 25938563A US 3262773 A US3262773 A US 3262773A Authority US United States
2.1. Arsenic Removal by Oxidation Techniques. Oxidation involves the conversion of soluble arsenite to arsenate. This alone does not remove arsenic from the solution, thus, a removal technique, such as adsorption, coagulation, or ion exchange, must follow [].For anoxic groundwater, oxidation is an important step since arsenite is the prevalent form of arsenic at near neutral pH [].
Arsenic and antimony removal from water/wastewater. Different technologies have been used and proposed to remove arsenic and antimony from aqueous media. Considering legal limits and toxic effects, the removal of these metalloids from water/wastewater (due to anthropogenic or natural reasons) is mandatory.
Arsenic poisoning is a medical condition that occurs due to elevated levels of arsenic in the body. If arsenic poisoning occurs over a brief period of time, symptoms may include vomiting, abdominal pain, encephalopathy, and watery diarrhea that contains blood. Long-term exposure can result in thickening of the skin, darker skin, abdominal pain, diarrhea, heart disease, numbness, and cancer.
1. Use oxidation filtration to get rid of iron and arsenic traces. Oxidation filters are generally stronger than water softeners and can remove harmful chemicals that are common to well water, specifically arsenic. If your well needs to be treated for arsenic and iron traces, choose an oxidation system to filter your water.
Arsenic. Arsenic is a naturally occurring chemical element that is widely distributed in the Earth's crust. Arsenic levels in the environment can vary by locality, and it is found in water, air, and soil. Arsenic in drinking water is a widespread concern. But, arsenic levels tend to be higher in groundwater sources, such as wells, than from ...
Antimony, like arsenic, has an s 2 p 3 outermost orbital electronic distribution and so has a total of two valence states, Sb(III) and Sb(V), which are the most common Sb species found in the environment. Over the range of environmentally significant pH, Sb(V) mainly occurs in the form of Sb (OH) 6 − under aerobic conditions []. Sb (OH) 6 −, an octahedral framework has a sizeable ionic ...
W ith the development of the scrap-EAF (electric arc furnace) route, the adverse effect of residual elements such as tin, copper, arsenic and antimony from steel scraps has attracted extensive ...
The aim of this study was to assess the efficiency of a granular ferric oxide adsorbent medium to remove arsenic and antimony from drinking water via rapid small-scale column tests (RSSCTs).
1. Introduction. Arsenic and antimony are ubiquitous elements in the environment originating from natural sources as well as human activities. Arsenic is known to be one of the most toxic elements and has serious effects on plants, animals and human health .As a cumulative toxic element, antimony has chemical and toxicological properties similar to those of arsenic.
In the following data the elimination from metal containing 100 of copper is seen to be 0.209 of arsenic and 0.118 of antimony, which would represent 0.104 per cent, of arsenic and 0.059 per cent, of antimony on the slag produced, so that it is probable that the greater part of the eliminated arsenic and antimony are present in the slag.
Trace elements, as important components of the environment, play crucial roles in the functioning of life. Some elements such as arsenic (As), mercury (Hg) and antimony (Sb) can be highly toxic to various life forms, while some others are probably considered to be essential, but they can become toxic at …
The geochemistry of antimony has similar traits to arsenic and often coexists with arsenic in the natural environment (Arai, 2010; Wilson and others, 2010). Both trace elements most commonly occur ...
The second part of a literature review on the deportment of trace toxic elements in gold processing by cyanidation is presented. Part 1 of this review collated the relevant information on trace element mineralogy, aqueous solution chemistry and toxicity for lead, cadmium, mercury, arsenic, antimony, bismuth, selenium, and tellurium.
1. Introduction. Antimony (Sb) is widely used in a variety of products such as batteries, flame retardants, textiles, plastics, ammunition, ceramic opacifiers, and glass decolorizers, .Antimony and its compounds have been regarded as pollutants of priority interest by the United States Environmental Protection Agency (USEPA) and the European Union (EU) .
A process for removal of trace impurities of hydrides of arsenic, phosphorus, antimony, silicon, and boron and sulfur and oxygenates and compounds containing these impurities from a hydrocarbon stream comprising contacting the hydrocarbon stream with an adsorbent material selected from the group consisting of zeolites and promoted alumina to adsorb compounds containing sulfur and/or …
inorganic trace contaminants such as arsenic and antimony are not retained by a typical MF or UF membrane.7 Modification of such a membrane, i.e. by iron oxides, can remove the trace con-taminant by adsorption onto the secondary membrane, while the primary membrane achieves high overall water quality by fil-tering out suspended particles.8
The most stable forms of Sb(III) are as antimony hydroxide, also known as trioxoantimonic acid (III) (H 3 SbO 3 ) and antimonous acid Sb(OH) 3 (or antimony III hydroxide) which exists across a ...
In some instances, pre-treatment of sulfide concentrates (such as copper) is required to selectively remove antimony/arsenic impurities to make it more suitable for pyrometallurgical processing ...
Antimony is a member of group 15 of the periodic table, one of the elements called pnictogens, and has an electronegativity of 2.05. In accordance with periodic trends, it is more electronegative than tin or bismuth, and less electronegative than tellurium or arsenic.Antimony is stable in air at room temperature, but reacts with oxygen if heated to produce antimony trioxide, Sb 2 O 3.
US1964781A US479075A US47907530A US1964781A US 1964781 A US1964781 A US 1964781A US 479075 A US479075 A US 479075A US 47907530 A US47907530 A US 47907530A US 1964781 A US1964781 A US 1964781A Authority US United States Prior art keywords antimony mass temperature gold contained Prior art date Legal status (The legal status is an assumption and is not a …
Arsenic and antimony are important trace elements in magmatic-hydrothermal systems, ... ƒ> the nickel-nickel oxide buffer, NNO). The partitioning of Sb is independent of O2 ... The remove rate of the FeOC material was 165 nmole day-1 g-1 (dry weight of
Antimony is a trace constituent in most of the arsenic-bearing phases in the Giant mine tailings, namely the roaster iron oxides, calcium-iron arsenate, iron oxyhydroxides, copper-iron arsenate, and lead arsenate. Data from this study show that each of the roaster iron oxide grains analyzed through EMPA contained up to 2.7 wt% antimony .
A new alkaline pressure oxidative leaching process (with NaNO3 as the oxidant and NaOH as the alkaline reagent) is proposed herein to remove arsenic, antimony, and lead from bismuth-rich and arsenic-rich lead anode slime for bismuth, gold, and silver enrichment. The effects of the temperature, liquid-to-solid ratio, leaching time, and reagent concentration on the leaching ratios of arsenic ...
Antimony is generally associated with arsenic in sulfide ores . As a result, combined pollution of Sb(III) and As(III) has been investigated [63] . In case of this scenario, the fabricated adsorbent [email protected] was utilized to simultaneously remove both contaminants.