arsenic minerals sulphides
Arsenic sulfide may refer to Arsenic trisulfide As 2 S 3 the mineral orpiment Tetraarsenic tetrasulfide As 4 S 4 the mineral realgar ball mill barring procedure in nigeria price
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arsenic minerals sulphides
Arsenic trisulfide is the inorganic compound with the formula As 2 S 3 It is a bright yellow solid that is insoluble in water It is a bright yellow solid that is insoluble in water It also occurs as the mineral orpiment Latin auripigment which has been used as a pigment called Kings yellow
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arsenic minerals sulphides
Realgar and orpiment are very similar minerals They are both arsenic sulfides and members of the monoclinic crystal system They form in the same geological environments and can be closely associated in the same deposits They have similar physical properties and similar histories of use by man Because of these similarities we decided to describe realgar and orpiment in a single article
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arsenic minerals sulphides
The effects of arsenic and antimony sulphide minerals on the extraction of gold from a synthetic ore consisting essentially of free gold and glass sand were investigated The amount of mineral added in each test was such that the synthetic ore assayed 025 As or 025 Sb
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arsenic minerals sulphides
Arsenopyrite FeAsS orpiment As 2 S 3 and realgar AsSAs 4 S 4 are the most common arsenic sulfide minerals occurring primarily in hydrothermal and magmatic ore deposits Arsenic is commonly found in sulfidebearing mineral deposits especially with gold mineralization
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arsenic minerals sulphides
THE MINERAL ARSENOPYRITE Uses Important ore of arsenic minor source of gold and as mineral specimens A major ore of arsenic Arsenopyite can contain a small amount of gold as an impurity Although an ore of arsenic it is not intentionally mined for that reason
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arsenic minerals sulphides
The sulfide minerals are a class of minerals containing sulfide S 2− or persulfide S 2 2− as the major anion Some sulfide minerals are economically important as metal ores The sulfide class also includes the selenides the tellurides the arsenides the antimonides
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arsenic minerals sulphides
Minerals with the formula MAsS and MAs 2 M Fe Ni Co are the dominant commercial sources of arsenic together with realgar an arsenic sulfide mineral and native elemental arsenic An illustrative mineral is arsenopyrite Fe As S which is structurally related to iron pyrite
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arsenic minerals sulphides
Arsenic is an elusive element with a mysterious ability to change color behavior reactivity and toxicity For example two arsenic sulfide minerals redcolored realgar As 4S 4 and bright yellow orpiment As 2S 3 were described by the ancient Greeks but they considered them to be two entirely different substances Irgolic 1992
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arsenic minerals sulphides
Several other lesscommon minerals contain arsenic including orpiment realgar and enargite which are arsenic sulfides Most arsenic is obtained not from an ore mineral of arsenic but as a byproduct in the treatment of gold silver copper and other metal ores
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arsenic minerals sulphides
Arsenic remediation by formation of arsenic sulfide minerals in a continuous anaerobic bioreactor Lucia RodriguezFreire a Sarah E Moore a Reyes SierraAlvarez a Robert A Root b Jon Chorover b and James A Field a
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arsenic minerals sulphides
Although arsenic is present in more than 200 mineral species the most common one is arsenopyrite which is an iron arsenic sulfide FeAsS As deposits of arsenopyrite become exposed to the atmosphere usually through mining the mineral slowly oxidizes converting the arsenic into oxides that are more soluble in water leading to acid mine drainage AMD Akai et al 2004 Appelo and Postma 2004
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arsenic minerals sulphides
Relation to Mining The most common arsenic mineral is arsenopyrite a compound of iron arsenic and sulfur Several other lesscommon minerals contain arsenic including orpiment realgar and enargite which are arsenic sulfides Most arsenic is obtained not from an ore mineral of arsenic but as a byproduct in the treatment of gold silver
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arsenic minerals sulphides
Arsenic and Antimony Sulphide Minerals in Cyanidation The successful cyanidation of gold ores containing appreciable amounts of arsenic or antimony sulphide minerals such as orpiment realgar and stibnite is usually difficult or even impossible
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arsenic minerals sulphides
Concurrent microbial reduction of arsenate As V and sulfate SO 4 2 can result in the formation of poorly soluble arsenic sulfide minerals ASM The objective of this research was to study As biomineralization in a minimal iron environment for the bioremediation of Ascontaminated groundwater using simultaneous As V and SO 4 2 reduction
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arsenic minerals sulphides
The two minerals are almost indistinguishable by ordinary means although gersdorffite is much more common Gersdorffite forms a solid solution series with cobaltite meaning the nickel and cobalt in the two minerals are substitutable Both minerals are found in magma derived sulfide deposits
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arsenic minerals sulphides
The structure of arsenopyrite is characterized by iron atoms octahedrally coordinated by three arsenic and three sulfur atoms and linked through both edges and corners FIG 2 Each arsenic or sulfur atom is tetrahedrally coordinated to three iron atoms and to one sulfur or arsenic atom to form As–S2 dimers
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arsenic minerals sulphides
In addition the standard depressants such as lime cyanide sulphide and permanganate are ineffective as the flotation responses of arsenicbearing minerals are similar to other copper sulphide
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arsenic minerals sulphides
Arsenic minerals pose a problem for copper flotation concentrates since they are often associated with copper minerals display similar flotation behaviour to copper minerals and therefore report to final copper flotation products Despite extensive research the rejection of
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arsenic minerals sulphides
Arsenic contents were less than 2000 ppm in the lead and zinc concentrates Copper concentrate assayed 503 As since the major copper minerals were in tennantite form copper arsenic sulphide mineral In flotation tests nontoxic reagents such as metabisulphite caustified starch and activated carbon were used to depress minerals in
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arsenic minerals sulphides
Arsenic also can be released into groundwater as a result of human activities such as mining and from its various uses in industry in animal feed as a wood preservative and as a pesticide In drinkingwater supplies arsenic poses a problem because it is toxic at low levels and is a known carcinogen
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arsenic minerals sulphides
Oxidises slowly in air and is then covered with a thin crust of tiny arsenolite crystals Used in bronzing pyrotechny insecticides and poisons and as a doping agent in transistors Gallium arsenide is used as a laser material to convert electricity directly into coherent light Arsenic and its compounds are poisonous
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arsenic minerals sulphides
Aug 21 2013 · The main ore minerals in VMS deposits are unsurprisingly sulphides including pyrite iron sulphide sphalerite zinc sulphide chalcopyrite copperiron sulphide and galena lead sulphideVMS deposits contain minor amounts of silver and gold plus a large variety of other elements including cobalt tin selenium manganese arsenic tellurium antimony and mercury among others
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arsenic minerals sulphides
The Mineral arsenopyrite Important European localities for Arsenopyrite include Panasqueira Portugal Freiberg Saxony Germany Trepca Kosovo former Yugoslavia and several of the ore deposits in the Cornwall area in England In South America fine Arsenopyrite crystals have come from Potosi Bolivia and the Pachapaqui District
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arsenic minerals sulphides
Recent research has demonstrated promising results showing the possibility of separating arseniccopper sulphides from other copper minerals by controlling the potential of the flotation pulp
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arsenic minerals sulphides
Arsenic trisulfide is the inorganic compound with the formula As 2 S 3 It is a bright yellow solid that is insoluble in water It is a bright yellow solid that is insoluble in water It also occurs as the mineral orpiment Latin auripigment which has been used as a pigment called Kings yellow
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arsenic minerals sulphides
Most widespread minerals containing Arsenic This list of minerals containing Arsenic is built from the locality database This is based on the number of localities entered for mineral species and is therefore slanted towards minerals interesting to collectors with less coverage of common rockformingminerals so it does not give an undistorted distribution of Arsenic mineral species
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arsenic minerals sulphides
The oxidation rate of arsenic minerals and nonarsenic minerals has been compared in a series of papers to explain the selective flotation of arsenic minerals from other sulfide minerals According to Iwasaki et al 1988 nickel arsenide Ni 11 As 8 is much more easily oxidized than pyrrhotite pentlandite chalcopyrite and cubanite
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arsenic minerals sulphides
Arsenic can exist in sulfide minerals either as a dominant mineralforming element or as an impurity Arsenic release into nature is a slow process as a result of mineral weathering however physical forces such as grinding crushing and pulverization from mining activities greatly increase the release rate
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arsenic minerals sulphides
Arsenic is released into the environment naturally through the weathering oxidation and erosion of sulfide minerals 1 These sulfide minerals can form soils with very high concentrations of arsenic and the arsenic can dissolve in water 1 An estimated 25 of arsenic emissions into the atmosphere come from natural sources mostly volcanoes
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arsenic minerals sulphides
The formation of secondary mineral phases on the surfaces of Asbearing sulfides may retard the mobility of As and potentially decrease the acidity Therefore passivation of mineral surfaces with a mineral coating may be a reasonable strategy to minimize the affects of surface mining
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arsenic minerals sulphides
Realgar αAs4S4 is an arsenic sulfide mineral also known as ruby sulphur or ruby of arsenic It is a soft sectile mineral occurring in monoclinic crystals or in granular compact or powdery form often in association with the related mineral orpiment As2S3
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arsenic minerals sulphides
St Peter Sandstone contains arsenicrich minerals When sulfide minerals common in this rock are exposed to oxygen in the air – either at the water table elevation or from drilling activity – chemical reactions solubilize these minerals and lead to very high levels of arsenic in water exceeding 100 ppb or 10 times the ES In lowoxygen
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arsenic minerals sulphides
Arsenic and antimony are probably volatilized as sulphides but the greater part of both is concentrated in the resulting regulus Bismuth and its sulphides which may be reduced from the oxides and sulphates formed in the calcination are volatilized in considerable proportions during the smelting operation
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arsenic minerals sulphides
Metal sulfides are the most important group of ore minerals Here we review what is known about their compositions crystal structures phase relations and parageneses Much less is known about their surface chemistry their biogeochemistry or the formation and behaviour of ‘nanoparticle’ sulfides whether formed abiotically or biogenically
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arsenic minerals sulphides
Realgar is an important ore of arsenic It is used in the manufacturing of fireworks and was historically used as a red pigment Realgar is also an important collectors mineral and the transparent gemmy forms are especially desired
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arsenic minerals sulphides
On average about 61 percent of the sulphide minerals were present as pyrite while about 35 percent was present as arsenopyrite Arsenic was essentially only associated with arsenopyrite with the exception of Ore 7 which had about 28 percent associated with ironarsenic oxides
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arsenic minerals sulphides
During the formation of sedimentary rocks arsenic is carried down by precipitation of iron hydroxides and sulphides In a moist climate arsenic sulphides are easily oxidized become watersoluble are washed out of the sediment particles by meteoric precipitation and are transported with run off
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arsenic minerals sulphides
Sulfide mineral They also are the ore minerals of most metals used by industry as for example antimony bismuth copper lead nickel and zinc Other industrially important metals such as cadmium and selenium occur in trace amounts in numerous common sulfides and are recovered in refining processes
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