Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Arsenopyrite, FeAsS

Arsenic is widely dispersed in nature found in the minerals arsenopyrite, FeAsS orpiment, AS2S3 realgar, AS2S2 loUengite, FeAs2 enargite, CuS ... [Pg.61]

Arsenic trioxide is obtained by roasting the mineral arsenopyrite, FeAsS, in air at 650 to 700°C. It is also obtained as a by-product during the smelting of... [Pg.71]

Arsenopyrite (FeAsS), an arsenosulfide, is the most common arsenic mineral on Earth (Welch et al., 2000), 597. The mineral occurs in a variety of hydrothermal deposits and some metamorphic and intrusive igneous rocks Table 2.5 (Klein, 2002), 369. As mentioned earlier in this chapter, the crystalline structure of... [Pg.15]

Arsenopyrite FeAsS Arsenosulfide Hydrothermal deposits, intrusive igneous rocks, metamorphic rocks, microbial precipitates... [Pg.16]

Schaufuss, A.G., Nesbitt, H.W., Scaini, M.J. et al. (2000) Reactivity of surface sites on fractured arsenopyrite (FeAsS) toward oxygen. American Mineralogist, 85(11-12), 1754-66. [Pg.66]

Under anoxic conditions in the subsurface, precipitation/coprecipitation, sorption, and dissolution reactions in hydrothermal fluids commonly involve realgar (AsS or AS4S4), arsenopyrite (FeAsS), arsenian pyrite (FeS2), and especially orpiment (AS2S3). Orpiment dissolves in reducing and low H2S hydrothermal waters at temperatures up to at least 300 °C as shown in the following reaction (Webster and Nordstrom, 2003, 110) ... [Pg.91]

Pokrovski, G.S., Kara, S. and Roux, J. (2002) Stability and solubility of arsenopyrite, FeAsS, in crustal fluids. Geochimica et Cosmochimica Acta, 66(13), 2361-78. [Pg.224]

Lead arsenate — PbHAs04 Arsenopyrite — FeAsS Arsine — ASH3... [Pg.238]

Arsenosulfide A mineral or other compound containing both arsenide and sulfide as the major anions. Arsenopyrite (FeAsS) is an arsenosulfide mineral (compare with thioarsenic). [Pg.440]

Arsenic is found primarily as sulfides in orpiment, As2S3, realgar, AS4S4, and arsenopyrite, FeAsS, but it also occurs as arsenolite, As406. Arsenic compounds have been known since antiquity, and orpiment, which is yellow, was probably used as a yellow pigment. [Pg.301]

Sulfide minerals are one of the most important natural sources of arsenic in groundwater. Oxidation of arsenopyrite (FeAsS), in analogous fashion to pyrite (FeS2), may release high coneentrations of arsenie into solution. [Pg.130]

Aerobic mineral oxidation resulting in mineral degradation and product mobilization Aerobic bacterial oxidation of elemental sulphur (S°), of various mineral sulphides such as pyrite (FeS2), chalcopyrite (CuFeS2), arsenopyrite (FeAsS), sphalerite (ZnS), cobalt sulphide (CoS) and nickel sulphide (NiS) to corresponding metal sulphates, and of uraninite (UO2) to U02 are examples in which oxidizable minerals undergo dissolution of one or more of their constituents, which are thus mobilized (see Ehrlich, 2002a). [Pg.6]

On an industrial scale realgar has been prepared by the reaction between sulfur and an excess of elemental arsenic or AS2O3. Other commercial procedure involves the sublimation of a mixture of pyrites (FeS2), arsenopyrite (FeAsS), or the heating of arsenical pyrites, but these methods yield an impure product. [Pg.235]

Marcasite-type (orthorhombic) Arsenopyrite-type (orthorhombic) Loellingite-type (orthorhombic) Marcasite (FeS,) Ferroselite (FeSe,), etc. Arsenopyrite (FeAsS), gudmundite (FeSbS), safflorite (CoAs,) loellingite (FeAs,), FeSb etc. [Pg.275]

Marcasite (FeSj), arsenopyrite (FeAsS), loellingite (FeASj), and related minerals... [Pg.299]

Fig. 6.19. Schematic one-electron energy-band diagram for arsenopyrite, FeAsS (or safflorite CoAs,) (after Goodenough, 1972). Fig. 6.19. Schematic one-electron energy-band diagram for arsenopyrite, FeAsS (or safflorite CoAs,) (after Goodenough, 1972).
The possibility of using brine to slurry the ore in the presence of an oxidizer such as chlorine in order to extract metals from the more common sulfide minerals has been studied by Strickland and co-workers (Jl, S12, S13). The reactions of acid chlorine solutions with galena (PbS), pyrite (FeSj), sphalerite (ZnS), chalcocite (CujS), covellite (CuS), chalcopyrite (CuFeSs), bornite (CusFeSi), pyrrhotite (FeS), and arsenopyrite (FeAsS) were examined with respect to their reaction rates and mechanisms. [Pg.23]

The chief minerals of arsenic include orpiment, As S (from Latin anripigmentum, yellow pigment), realgar, AsS (a red substance), arseno-lite, As Op, and arsenopyrite, FeAsS. Arsenic trioxide (arsenious oxide) is obtained by roasting ores of arsenic. The element is made by reducing the trioxide with carbon or by heating arsenopyrite ... [Pg.456]

The oxidation of arsenopyrite [FeAsS] releases both sulfur and arsenic. Buckley and Walker (1988) studied the oxidation of arsenopyrite in alkaline and in acidic aqueous solutions. In air, the mineral reacted rapidly, and the oxidation of arsenic to As(III) was more rapid than the oxidation of iron on the same surface. Only a small amount of sulfur oxidation occurred. Under acidic conditions, the mineral formed sulfur-rich surfaces. [Pg.4701]

See other pages where Arsenopyrite, FeAsS is mentioned: [Pg.263]    [Pg.548]    [Pg.574]    [Pg.649]    [Pg.275]    [Pg.362]    [Pg.289]    [Pg.39]    [Pg.294]    [Pg.497]    [Pg.315]    [Pg.465]    [Pg.450]    [Pg.157]    [Pg.281]    [Pg.336]    [Pg.53]    [Pg.447]    [Pg.275]    [Pg.6]    [Pg.229]    [Pg.245]    [Pg.9]    [Pg.19]    [Pg.72]    [Pg.4239]    [Pg.4561]    [Pg.4573]    [Pg.4713]   


SEARCH



Arsenopyrite

© 2024 chempedia.info