Solubilities and stabilities of ferric arsenate compounds

Krause, E.; Ettel, V.

doi:10.1016/0304-386x(89)90028-5

Cited by 246 publications

(79 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…iron precipitation of a high density sludge (HDS). The iron precipitation approach requires increasing the pH with an alkaline reagent such as hydrated lime and subsequently coprecipitating As with amorphous ferric oxyhydroxide (8)(9)(10). HDS is a benchmark procedure in acidic mine drainage treatment (11) and widely used in China.…”

Section: Introductionmentioning

confidence: 99%

Arsenite and arsenate adsorption on coprecipitated bimetal oxide magnetic nanomaterials: MnFe2O4 and CoFe2O4

Zhang

Niu

Cai

et al. 2010

Chemical Engineering Journal

503

156

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Arsenite and arsenate adsorption on coprecipitated bimetal oxide magnetic nanomaterials: MnFe2O4 and CoFe2O4

Zhang

Niu

Cai

et al. 2010

Chemical Engineering Journal

503

156

View full text Add to dashboard Cite

“…Los resultados obtenidos indicaron que este co-precipitado consta de dos componentes: Fe(OH) 3 La estabilidad y solubilidad de los compuestos formados en este proceso es un tema en discusión; sin embargo, actualmente es aceptada la precipitación de arsénico como un arsenato férrico básico, FeAsO 4 ·Fe(OH) 3 , formado por co-precipitación con el ión férrico, mientras que el arsenato férrico simple, FeAsO 4 , formado con una razón molar 1:1, es relativamente soluble a pH neutro. El arsenato férri-co básico con razones molares de tres o más, es estable en un amplio rango de pH [25][26][27] . Las caracterís-ticas de compuestos férricos, lantánicos y compuestos de arsenato férrico-lantánico, formados a temperatura ambiente en pH ácido y alcalino, fueron investigadas por Nanor et al [28] mediante estudios de potencial zeta, difracción de rayos X (DRX) y con microscopía de barrido electrónico (MEB).…”

Section: I In Nt Tr Ro Od Du Uc Cc Ci Ió óN Nunclassified

Eliminación de arsénico mediante flotación por adsorción coloidal utilizando flóculos de Fe(OH)<sub>3</sub> en un sistema de flotación por aire disuelto

Pavez¹,

Palacios²,

Aguilar³

2009

Rev. metal.

View full text Add to dashboard Cite

E El li im mi in na ac ci ió ón n d de e a ar rs sé én ni ic co o m me ed di ia an nt te e f fl lo ot ta ac ci ió ón n p po or r a ad ds so or rc ci ió ón n c co ol lo oi id da al l u ut tl li iz za an nd do o f fl ló óc cu ul lo os s d de e F Fe e( (O OH H) ) 3 3 e en n u un n s si is st te em ma a d de e f fl lo ot ta ac ci ió ón n p po or r a ai ir re e d di is su ue el lt to o ( (• •) ) O. Pavez * , J. M. Palacios * , C. Aguilar 2** R Re es su um me en n En el presente trabajo se estudió el efecto de la relación Fe/As sobre la eliminación de arsénico aplicando flotación por adsorción coloidal en aguas con distintos contenidos de arsénico. Como coagulante se utilizó cloruro férrico y dodecil sulfato de sodio como colector, y las soluciones fueron preparadas con trióxido de arsénico. Los resultados obtenidos muestran que el rango de pH 4-5,5 es el más adecuado para la eliminación de arsénico, aumentando el porcentaje de eliminación con el incremento de la concentración inicial de Fe(III) en la solución. Por otra parte, a medida que disminuye la concentración inicial de arsénico en la solución se requiere una mayor proporción de Fe/As para su eliminación. Además, se mostró que para soluciones conteniendo 13,73 mg/l, 1,71 mg/l y 0,105 mg/l de As, se necesitan relaciones Fe/As de 6:1, 18:1 y 800:1 para lograr una eliminación de arsénico desde la solución del orden de 95 %. P Pa al la ab br ra as s c cl la av ve eArsénico; Eliminación; Flotación por aire disuelto; Relación Fe/As.A Ar rs se en ni ic c r re em mo ov va al l b by y u us si in ng g c co ol ll lo oi id da al l a ad ds so or rp pt ti io on n f fl lo ot ta at ti io on n u ut ti il li iz zi in ng g F Fe e( (O OH H) ) 3 3 f fl lo oc c i in n a a d di is ss so ol lv ve ed d a ai ir r f fl lo ot ta at ti io on n s sy ys st te em m A Ab bs st tr ra ac ct tIn the present work, the influence of Fe/As ratio on the As removal, from aqueous solutions, applying flotation by colloidal adsorption was studied. Ferric chloride was used as coagulant and dodecil sulfate as collector, and arsenic trioxide was utilized to preparing the solutions. The obtained results show that the highest arsenic removal was accomplished in the range of pH between 4 and 5,5, and the increasing of the initial concentration of Fe(III), increases the removal of arsenic from the solution. However, with the decreasing of the initial concentration of arsenic in the solution, it is required a larger Fe/As ratio for its removal. For solutions containing: 13,73, 1,71 and 0,105 mg/L of arsenic, it was shown that to remove around 95% of the dissolved arsenic, a Fe/As ratios of approximately 6/1, 18/1 and 800/1, respectively, are required. K Ke ey yw wo or rd ds s I IN NT TR RO OD DU UC CC CI IÓ ÓN NEl arsénico es un elemento que forma parte de la corteza terrestre y se encuentra diseminado en pequeñas cantidades en la naturaleza. Su presencia en el agua puede ocurrir por disolución natural de pequeños depósitos geológicos, la descarga de efluentes industriales y la sedimentación de material parti...

show abstract

“…Moreover, in a subsequent publication, the same researchers (Paktunc et al, 2004) reported different As-Ca coordination numbers for the same phase (arseniosiderite), namely 2.44, 3.60 and 5.5, thus creating more uncertainty as to the true molecular identification of arseniosiderite and how it is distinct at the local molecular level to yukonite. The stability of arseniosiderite in terms of arsenic leachability was first investigated by Krause & Ettel (1989) who found that after 197 days in water, ~ 6-7 mg/L As was released into solution at pH 6.85. Swash & Monhemius (1994) also tested the arsenic release of arseniosiderite samples for 7 days and found them it to give release ~0.5-0.7 mg/L As over the pH range 5-9.…”

Section: Introductionmentioning

confidence: 99%

“…At ambient temperature and pressures, poorly crystalline Fe(III)-As(V) solids (Krause & Ettel, 1989;Langmuir et al, 1999;Jia & Demopoulos, 2005, 2007 are produced by co-precipitation, which consist of ferric arsenate and arsenate-adsorbed onto ferrihydrite. (Langmuir et al, 1999;Jia & Demopoulos, 2005, 2007 These co-precipitates are produced from high Fe (III) to As(V) molar ratio solutions (typically >3) by lime neutralization (Riveros et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…This can be done for example at elevated temperatures, near the boiling point of water (80-95 °C) and under controlled supersaturated conditions. (Singhania et al, 2005;Fujita et al, 2008) Crystalline Scorodite is at least 100 times less soluble than its amorphous counterpart (FeAsO4 · xH2O[am]) (Krause and Ettel, 1989;Langmuir et al, 2006;Bluteau & Demopoulos, 2007) and given its high arsenic content (in comparison to the Fe (III)-As(V) co-precipitates as mentioned above) has been advocated for the fixation of arsenic-rich wastes. (Filippou & Demopoulos 1997;Fujita et al, 2008) At even higher temperatures (>100 °C, the hydrothermal precipitation range) during autoclave hydrothermal processing of copper (Berezowsky et al, 1999) and gold (Dymov et al, 2004) sulphide feedstock's, other crystalline phases than Scorodite are reported to form some of which exhibit equal or better stability than Scorodite (Swash & Monhemius, 1994;Dutrizac & Jambor, 2007.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation