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US20080274026A1 US11/928,229 US92822907A US2008274026A1 US 20080274026 A1 US20080274026 A1 US 20080274026A1 US 92822907 A US92822907 A US 92822907A US 2008274026 A1 US2008274026 A1 US 2008274026A1 Authority US United States Prior art keywords sulfide zinc aqueous solution ions copper Prior art date Legal status (The legal status is …


Antimony and iron probably turned into Sb(V)-O-Fe(II) and Sb(V)-O-Fe(III) through complexation or co-precipitation in the presence of S. oneidensis. It was speculated that secondary minerals formed bidentate mononuclear edge-sharing complexes.


Precipitation Process. a refining process in which the sulfides of a metal ore react with a precipitating agent—metallic iron. The precipitation process is the most commonly used method for refining antimony ores in the USSR. Antimony is reduced by iron in the reaction Sb 2 S 3 + 3Fe = 2Sb + 3FeS, which at 1000°-1100°C is an irreversible ...


The oxidation of ferrous ions, in acid solution, by resting suspensions of Thiobacillus ferrooxidans produced sediments consisting of crystalline jarosites, amorphous ferric hydroxysulfates, or both. These products differed conspicuously in chemical composition and infrared spectra from precipitates formed by abiotic oxidation under similar conditions. The amorphous sediments, produced …


Sequential Precipitation of Iron, Copper, and Zinc from Wastewater for Metal Recovery ... Antimony, and Zinc by Acid and Saline Leaching. Journal of Environmental Engineering August 2014 . Effects of Iron on Chemical Sulfide Oxidation in Wastewater from Sewer Networks.


The antimony-iron sulfide system in general does not produce alloys below 540 °C from traditional solid-state methods. However, single source precursors have been known to produce unexpected products that arise from kinetically trapped polymorphs. In this paper, we test the efficacy of this approach toward the Fe-Sb-S system. Antimony and iron diethyldithiocarbamate complexes of the form Sb ...


Melting points of common materials. Melting point of steel: 1425-1540 °C / 2600-2800 °F Melting point of gold: 1064 °C / 1947.5 °F Melting point of copper: 1084 °C / 1983 °F Melting point of iron: 1538 °C / 2800 °F Melting point of lead: 327.5 °C / 621 °F Melting point of silver: 961 °C / 1761 °F. Download Reference Sheet:


Antimony, compd. with iron (2:1) 1. EINECS 234-669-7. Antimony, compound with iron (2:1) DTXSID2065175


Iron is one of the most abundant metals of the Earth's crust. It occurs naturally in water in soluble form as the ferrous iron (bivalent iron in dissolved form Fe 2+ or Fe(OH) +) or complexed form like the ferric iron (trivalent iron: Fe 3+ or precipitated as Fe(OH) 3).The occurrence of iron in water can also have an industrial origin ; mining, iron and steel industry, metals corrosion, etc.


Iron precipitation started when antimony precipitation was almost complete. It was not possible to confirm the formation of Sb 2 O 5 by XRD. However, Sb 2 O 5 is very insoluble, 0.02 g·L − 1 Sb at 35 °C ( Baes and Mesmer, 1986 ), and since iron was retained in solution this is the likely phase as Sb 2 O 3 was not detected.


EiC July 2008 - Feature - Antimony revisited. Antimony lives in the neighbourhood of arsenic and shares similar traits ... not found alone'.2 Indeed, antimony is usually found as the sulfide ore, stibnite, Sb2S3, ... 250 years earlier.4 The process involved roasting stibnite to form the oxide, ... in which stibnite was reduced directly to metallic antimony by reaction with iron.


Antimony hydroxide precipitation. To remove antimony from wastewater, titanium hydroxide can be used as a precipitating reagent. The reaction is: This is carried out in a pH range that goes from 5 to 8.5 and it also manages to reduce the concentration to a value 100 times lower than the initial one. Cesium precipitation with tetraphenylborate


@article{osti_6796566, title = {Trace element removal by iron adsorption/coprecipitation: Process design manual}, author = {Merrill, D T and Diepolder, P R and Bluestein, M and Parker, D S}, abstractNote = {The iron adsorption/coprecipitation process can remove many inorganic priority pollutants to the extremely low concentrations now being required by federal …


precipitation. Prior to precipitation. ferrous sulphate is added to reduce chromium from hexavalent to trivalent state and also. to form stable complex ferrocyanides with cyanide. This batch study was carried out to evaluate the minimum pH range for the minimum solubility of metal hydroxide precipitation. All the metals (Cu. Ni. Zn.


The iron concentration in the hot acid leach solution will be reduced from some 10-25 g/l Fe to 0.5-1 g/l Fe. The iron may be removed quantitatively if necessary, but it is most likely of advantage to leave a small amount for precipitation as ferric hydroxide due …


Antimony (Sb) is an element in the group XV that has allotropic modifications ... reactive iron-based reactive media mixture, namely, the activated iron media (AIM), and ... oxidative precipitation of Fe(OH) 2 in term of crystal structure and composition. When


Saeidnia, S., Asadollahfardi, G. & Khodadadi Darban, A. Simulation of adsorption of antimony on zero-valent iron nanoparticles coated on the …


proportional to the arsenic or antimony concentration. 2.3 The typical detection limit for this method is 1.0 µg/L. 3.0 INTERFERENCES 3.1 Very high (>4000 mg/L) concentrations of cobalt, copper, iron, mercury, and nickel can cause analytical interferences through precipitation as reduced metals and associated blockage of transfer lines and ...


For example, iron precipitation will largely remove manganese from the water at pH 8 due to co-precipitation, but only if the iron concentration in the water is much greater than the manganese content (about 4 times more or greater). If the iron concentration in the AMD is less than four times the manganese content, manganese may not be removed ...


Antimony(III/V) removal via co-precipitation with iron has been considered with optimal pH, dose and kinetics being determined. The effect of selected anions – Cl −, SO 4 2− and PO 4 3− – have also been considered, the latter present due to a prior uranium removal step.


Iron Precipitation: Rich sulfide ore or liquated an timony sulfide (crude antimony) is reduced to metal by iron precipitation This is illustrated in equation 6. This process consisting of heating


Because much of qualitative analysis involves selective precipitation and then separation of the two phases, it is convenient to represent an analytical scheme in the form of a flow chart. For example, a simple flow chart is shown below for separating a known mixture of Ag+(group I), Cu2+(group II), and Ca2+ (group IV) ions. The addition of ...


A method for selectively processing a polymetallic oxide solution containing a plurality of base metals comprising at least one of: Cu, Co, Ni, Zn associated with iron, comprising acid leaching the solution; recovering a filtered leachate; oxidizing the leachate; and adjusting the pH of the leachate in presence of a complexing agent; wherein the acidic solution is one of: i) a hydrochloric ...


The coprecipitation of arsenic and antimony in the precipitation of iron, chromium, molybdenum, and tungsten can be inhibited by introducing a certain amount of hydrofluoric acid. This decreases the specific surface and porosity of the precipitates and inhibits the coprecipitation process.


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Antimony - Wikipedia

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.


Through this rapid oxidation the solubility of the iron falls from the Fe+2 curve to the Fe+3 curve shown on Figure 5. As the iron drops out of solution, it incorporates the heavy metals in a dense iron matrix as it forms. The metals are "occluded" in the iron solids due to their close association with the iron prior to its precipitation.


at pH 5.8 to 6.7, lost iron by oxidation and precipitation of ferric hydroxide at a rate governed by the diffusion of oxygen through the water. An aliquot of the natural water, acidified to pH 1.6, lost no ferrous iron after 3 months.


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Antimony - public.asu.edu

Solutions of antimony(III) chloride in HCl react when added to excess water to form the basic, white, insoluble salt SbOCl. SbCl 4 ­ (aq) + H 2 O(l) <==> SbOCl(s) + 2H + (aq) + 3Cl ­ (aq) Reducing Agents: In the presence of HCl, either aluminum or iron will reduce Sb …


Antimony (Sb(V)) in Sb mine drainage has adverse effects on the receiving water environments. This study for the first time demonstrated the feasibility of using sulfate-reducing bacteria (SRB) to convert sulfate ions in SMD into sulfides that reduce Sb(V) to Sb(III) and to …


The present method thus allows selective precipitation of iron, arsenic and antimony from an acidic solution containing a plurality of metals of value from the group of Cu, Zn, Co, Ni, Mg and Na by pH adjustment in the presence of a complexing agent. The acidic solution may be a hydrochloric acid solution or a sulfuric acid solution at a pH ...


Figure 8 - The Processes of a Conventional Metals Precipitation Treatment Plant 1. Rapid Mix The goal of the rapid mix operation is to first raise the wastewater pH to form metal hydroxide particles, as discussed above. After the addition of caustic, the next step is to add aluminum or iron salts, or organic polymers (coagulants)


Oxyhydroxides of iron, manganese and aluminum minerals have been recognized as naturally occurring Sb sequestrating agents in the environment. Antimony is also immobilized in the natural environment via precipitation with alkali and heavy metals resulting extremely stable mineral phases, such as schafarzikite, tripuhyite and calcium antimonates.


The smelting method of the sulphide ore is the iron precipitation method and oxide ore or poor ore may also be treated by the other methods. High purity antimony (99.98% Sb) is made by electrolysis. Reverberatory furnace is used for the iron precipitation method and cottrell electric apparatus was set to catch the flue dust.