Apparent solubilities of schwertmannite and ferrihydrite in natural stream waters polluted by mine drainage

Yu, Jae‐Young; Heo, Bong; Choi, In‐Kyu; Cho, Jeong-Pil; Chang, Ho‐Wan

doi:10.1016/s0016-7037(99)00261-6

Cited by 219 publications

(134 citation statements)

References 18 publications

Supporting

Mentioning

117

Contrasting

Unclassified

Order By: Relevance

“…The saturation index was calculated by means of the computer program REACT (Bethke, 1998) using the database (thermoµminteq.dat) with apparent solubility of schwermannite estimated from Yu et al (1999). Thus, the decrease in Sb concentration suggests that there was no mineralization involving Sb.…”

Section: Resultsmentioning

confidence: 99%

Natural attenuation of antimony in mine drainage water

et al. 2007

View full text Add to dashboard Cite

In this study, we investigated the natural attenuation of antimony (Sb) in the drainage water of an abandoned mine. Drainage water, waste rocks, and ocherous precipitates collected from the mine were investigated in terms of their mineralogy and chemistry. The chemistry of the drainage water was analyzed by measuring pH, oxidation-reduction potential (ORP), and electric conductivity on site as well as by inductively coupled plasma mass spectrometry and ion chromatography. As the drainage flowed downstream, the pH decreased rapidly from 7.05 to 3.26 and then increased slowly to 3.50. In a section where the pH increased, ocherous precipitates occur on a drainage water channel. We determined Sb levels in the drainage water, and the distribution of Sb in the mineral phases of waste rocks and precipitates was estimated by means of a sequential extraction procedure. The results of these investigations indicated that Sb, which is generated by the dissolution of stibnite (Sb 2 S 3 ) and secondary formed Sb minerals in waste rocks, was attenuated by iron-bearing ocherous precipitates, especially schwertmannite, that form over time in the drainage water. The Sb concentrations in the ocherous precipitates were up to 370 mg/kg, whereas the Sb concentrations in the drainage water downstream were below background levels (0.6 µg/L). Bulk distribution coefficients (K d ) for this Sb adsorption to the precipitates ranges up to at least 10 5 L/kg.

show abstract

Section: Resultsmentioning

confidence: 99%

Natural attenuation of antimony in mine drainage water

et al. 2007

View full text Add to dashboard Cite

show abstract

“…These so-called "ochre precipitates" consist of Fe-phases precipitated from the AMD. In contrast with other well crystallized products of pyrite oxidation, such as hematite or goethite, these mine drainage minerals (MDM; Murad et al, 1994) consist of poorly crystallized oxyhydroxides and oxyhydroxysulphates of fibrous to spherical morphology such as ferrihydrite and schwertmannite, in addition to jarosite and goethite, showing extremely small particle size (b 1 nm spherical particle diameter) (Bigham et al, 1990(Bigham et al, , 1996Carlson and Schwertmann, 1981;Dold, 2003;Fukushi et al, 2003;Kawano and Tomita, 2001;Majzlan et al, 2004;Murad et al, 1994;Nordstrom and Alpers, 1999;Regenspurg et al, 2004;Williams et al, 2002;Yu et al, 1999), which greatly enhance the reactive surface area, allowing the metal adsorption to these mineral phases.…”

Section: Discussionmentioning

confidence: 99%

An integrative assessment of environmental degradation of Caveira abandoned mine area (Southern Portugal)

Silva

Durães

Reis

et al. 2015

Journal of Geochemical Exploration

View full text Add to dashboard Cite

Since the end of the 1990s the Portuguese Iberian Pyrite Belt (IPB) is a typical European post-mining region with significant problems related to acid mine drainage (AMD), metal dispersion, mine waste management and unsafe mining infra-structures. The Portuguese government is providing particular attention on the sulphide abandoned mines and doing considerable investments on the mining recovery all over the country. The former Caveira mine was closed in the 1980s. It is considered an extremely impacted site due to the dimension of the areas affected by mining activities. Tailings, mine addicts and associated waste rock dumps, resulting from 129 years of pyrite and Cu exploitation, are spread along the Grândola stream. Despite the semi-arid climatic conditions of the area, the tailings are considerably eroded by the surficial waters, particularly during rainfall events. The past mining and smelting activities have resulted in severe contamination of the Grândola stream and its tributary by AMD (pH b 2) as well as degradation of surrounding stream sediments, soils and vegetation. In order to evaluate possible environmental risks, a sediment and surface water survey was carried out downstream the Caveira mine. The acidic effluent and mixed stream water show high Al, As, Ca, Cd, Cu, Fe, Hg, Mg, Mn, Ni, Pb and SO 4 concentrations, with several of these contaminants exceeding local and/or surface water quality standards. The data show a strong seasonal variation of surface water quality with poorer water quality during the dry and rainy seasons caused by evaporation and efflorescent salt dissolution, respectively. The variable flow regime at the local streams causes dilution of AMD rich in trace metals reaching background within 14 km downstream. The potential toxicity of stream metal concentrations was determined using cumulative criterion unit (CCU) scores and the modified AMD index (MAMDI), which highlighted As, Cd, Cu, Pb and Zn as the major sources of potential chronic stream toxicity, with emphasis on winter season. Although the threshold of the likely harm to aquatic life is exceeded at all sites, the two indexes highlight differences relating to the extension of contamination effects. The Average Index of Toxicity (AIT) showed that sediment contamination is very high even when the distance to mine promoted a decreasing in water metal concentrations, which are being precipitated in the sediments due to pH increase.

show abstract

“…In the waters precipitating the brownish yellow schwertmannite, SO 4 species occurs mostly as free SO 4 2-ions with less amounts of AlSO 4 + , CaSO 4(aq) and MgSO 4(aq) ( (Yu, et al, 1999).…”

Section: Geochemical Computationsmentioning

confidence: 99%

Seasonal change of mineral precipitates from the coal mine drainage in the Taebaek coal field, South Korea.

Kim

Choo

2003

Geochem. J.

View full text Add to dashboard Cite

The seasonal change of the precipitates from the acid coal mine drainages is remarkable in the Taebaek coal field in the middle eastern part of the Korean peninsula. The mineral precipitates in the creeks show various colors such as brownish yellow, white, and reddish brown, depending on the chemical conditions of stream waters. The brownish yellow precipitate consist maily of schwertmannite, the white one of poorly crystalline Al-sulfate, and the reddish brown one of ferrihydrite. Neutralization of acid mine drainage took place by mixing with unpolluted waters and/or buffering by dissolution of carbonate or aluminosilicates. The main factors leading to the seasonal change of precipitates are precipitation of hydroxide mineral, water mixing from adjacent unpolluted branch streams, and water-rock interaction. tion of AMD and its impact on the stream waters may depend on the pyrite content and its oxidation rate.The dissolved species may precipitate in the stream bottom under control of the chemical conditions of the streams. Potential chemical reactions in AMD include sulfide mineral oxidation and dissolution, non-sulfide mineral dissolution and precipitation, coprecipitation, acid neutralization, and ion exchange (Yu, 1996a). The geochemical and mineralogical problems met in the coal mine drainage have been studied by many workers in Korea (Chon et al

show abstract

Apparent solubilities of schwertmannite and ferrihydrite in natural stream waters polluted by mine drainage

Cited by 219 publications

References 18 publications

Natural attenuation of antimony in mine drainage water

Natural attenuation of antimony in mine drainage water

An integrative assessment of environmental degradation of Caveira abandoned mine area (Southern Portugal)

Seasonal change of mineral precipitates from the coal mine drainage in the Taebaek coal field, South Korea.

Contact Info

Product

Resources

About