Concentration and distribution of trace elements in some coals from Northern China

Song, Dangyu; Qin, Yong; Zhang, Junying; Wang, Wenfeng; Chen, Zheng

doi:10.1016/j.coal.2006.04.001

Cited by 73 publications

(36 citation statements)

References 28 publications

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“…As mentioned above, the distribution and modes of occurrence of Cd, Cr, and Pb in different coals varies significantly; the occurrence of Cd, Cr, and Pb in the environment are Cd (II), Cr (VI), and Pb (II), respectively (Song et al, 2007). With rising furnace temperature during coal burning, these trace elements will become part of the flue gas, and react with surrounding gases.…”

Section: Release Rates From Different Coal-fired Facilitiesmentioning

confidence: 99%

“…The remaining flue gas will be emitted into the atmosphere through the stack. Field tests have demonstrated that the removal efficiency by different types of PM and SO 2 control devices varied substantially (Song et al, 2007;Dai et al, 2008;Zhang et al, 2010). In this study, we assume the arithmetic mean values of those reported in available references as the average removal efficiencies by different PM and SO 2 control devices, as shown in Table 2 and Table S6 in the supplementary materials.…”

Section: Removal Efficiencies Of Pm and So 2 Control Devicesmentioning

confidence: 99%

“…Even when present at only parts per million levels in coal, hazardous elements can result in tons of pollutants discharged into the environment (von Storch et al, 2003). Previous studies have indicated the modes of occurrence, contents and distributions of Cd, Cr, and Pb varied substantially among provinces, sources, and even the coal of the same seam (Bai, 2003;Song et al, 2007;Li et al, 2006;Lu et al, 1995;Zhou et al, 2010).…”

Section: Average Content Of CD Cr and Pb In Coalmentioning

confidence: 99%

See 2 more Smart Citations

Temporal and spatial variation characteristics of atmospheric emissions of Cd, Cr, and Pb from coal in China

Tian

Cheng

et al. 2012

Atmospheric Environment

215

107

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Section: Release Rates From Different Coal-fired Facilitiesmentioning

confidence: 99%

Section: Removal Efficiencies Of Pm and So 2 Control Devicesmentioning

confidence: 99%

Section: Average Content Of CD Cr and Pb In Coalmentioning

confidence: 99%

See 1 more Smart Citation

Temporal and spatial variation characteristics of atmospheric emissions of Cd, Cr, and Pb from coal in China

Tian

Cheng

et al. 2012

Atmospheric Environment

215

107

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“…28,29 resultados e discussão geoquímica do carvão a tabela 2 apresenta as concentrações de 15 constituintes químicos do carvão da área de estudo e os seus fatores de concentração (FC) 35 o incremento substancial do ph (de 3,2 em aNa1 para 4,6 em aNa2) e decréscimo no Eh (de 625 para 445 mV) na Dam pós-tratamento com Cao condicionaram a diminuição nas concentrações de todos os elementos da água, exceto Ca, mg e Sr que aumentaram (tabela 3). o incremento destes elementos em aNa2 deve ser contribuição do agente neutralizante (Cao), um produto industrializado a partir de rochas calcárias da Bacia do Paraná.…”

Section: Introductionunclassified

Processos físico-químicos em drenagem ácida de mina em mineração de carvão no sul do Brasil

Campaner¹,

Luiz-Silva²

2009

Quím. Nova

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Recebido em 11/3/08; aceito em 14/8/08; publicado na web em 18/12/08PhySICo-ChEmICal PRoCESSES IN aCID mINE DRaINaGE IN Coal mINING, SoUth BRazIl. acid mine drainage generated from coal mine showed a ph of 3.2, high concentrations of So 4 2− , al, Fe, mn, zn and minor as, Cd, Co, Cr, Cu, Ni and Pb. the major reduction in the concentration occurred for al, as, Cr, Fe and Pb after the treatment with Cao. the evolution of these acid waters within the tributary stream showed decreasing concentration for all soluble constituents, except al. this natural attenuation was controlled by ph (6.4 to 10.8) as a result of concurrent mixing with tributary stream and reaction with local bedrock that contains limestone. aluminum increasing concentration during this evolution seems to be related to an input of al-enriched waters due to the leaching of silicate minerals in alkaline conditions. Keywords: acid mine drainage; metal contamination; treatment with Cao. introdução Drenagem ácida de mina (Dam) é um grave problema oriundo das atividades de mineração, tanto de metais quanto de carvão, por causar a degradação da qualidade de águas superficiais e subterrâneas, solos e sedimentos. a Dam é gerada especialmente pela oxidação de minerais de sulfeto e tem alta capacidade de lixiviação de elementos presentes no minério e nas rochas circundantes à área minerada. Estas drenagens são caracterizadas por ph baixo, alta condutividade e altas concentrações de al, Fe, mn, entre outros metais e metalóides, que auxiliam na acidez destas drenagens, uma vez que podem sofrer reações de hidrólise. 1 os minerais presentes nas rochas explotadas, o tipo e a quantidade do sulfeto oxidado condicionam os níveis de contaminação por metais e metalóides associados com a Dam, e são específicos de cada ambiente. 1,2 Dentre os sulfetos freqüentemente encontrados e que podem produzir drenagem ácida estão a pirita (FeS 2 ), arsenopirita (FeasS), calcopirita (CuFeS 2 ) e calcocita (Cu 2 S), sendo a primeira a mais comum. 3 o reconhecimento dos riscos ambientais da Dam tem conduzido ao desenvolvimento de várias técnicas para minimizar o impacto destas correntes ácidas nos ecossistemas. os sistemas convencionais de neutralização de Dam que utilizam reagentes alcalinos (e.g. Cao e CaCo 3 ) são os mais empregados em áreas de mineração. Estes sistemas consistem no aumento do ph e na remoção de metais na forma de hidróxidos. a principal característica da neutralização com reagentes alcalinos é a formação de resíduos (lama) decorrentes do processo de precipitação dos sólidos. Em geral, o processo de precipitação de constituintes químicos é em função do ph. Entretanto, outros fatores podem contribuir neste processo, como força iônica, temperatura, Eh, estado de oxidação dos metais, concentrações dos metais em solução e suas interações com sólidos precipitados. 4 Estudos prévios apontaram que a eficiência da neutralização por reagentes carbonáticos é fortemente influenciada por elevadas concentrações de ferro em solução. 5,6 o revestimento das partículas dos reagentes...

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“…According to Orem and Finkelman, (2003), most of the inorganic elements in coal are associated with detrital minerals but in some coals epigenetic mineralization is important. Trace elements in coal have been studied by a number of authors in different countries (Finkelman, 1982;Karayigit et al, 2000;Pollock et al, 2000;Ren et al, 1999;Song et al, 2007). Previous studies on trace elements in Nigerian coal revealed their occurrence (Olajire et al, 2007), composition (Ndiokwere et al, 1983), characteristics (Sonibare et al, 2005), and association (Ewa, 2004;Ewa and Adetunji, 1996).…”

Section: Introductionmentioning

confidence: 99%

Major oxides and trace element distributions in coal and coaly shale seams in the Enugu escarpment of South-Eastern Nigeria.

Ogala¹,

Omo-Irabor²,

Finkelman³

et al. 2010

Glo Jnl Geo Sci

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Elemental distributions in nine (9) sub-bituminous coal and four coaly shale samples from the Anambra Basin, southeastern Nigeria were determined using FUS-ICP and TD-ICP spectrometry. Of the major oxides in these samples, SiO 2 and Al 2 O 3 indicate the prevalence of quartz and clay minerals. The strong statistical correlation between SiO 2 and Al 2 O 3 indicates a common source, likely detrital. The strong correlation between the other major oxides with both SiO 2 and Al 2 O 3 indicates that all of these elements have a common detrital source. However, epigenetic carbonates and syngenetic or epigenetic sulphides may also be present. The concentrations of most trace elements in these coals are unremarkably, falling well within the range for U.S. and World coals. These data do not indicate any potential for economic by-product, potential technological problems or environmental or health concerns.

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Concentration and distribution of trace elements in some coals from Northern China

Cited by 73 publications

References 28 publications

Temporal and spatial variation characteristics of atmospheric emissions of Cd, Cr, and Pb from coal in China

Temporal and spatial variation characteristics of atmospheric emissions of Cd, Cr, and Pb from coal in China

Processos físico-químicos em drenagem ácida de mina em mineração de carvão no sul do Brasil

Major oxides and trace element distributions in coal and coaly shale seams in the Enugu escarpment of South-Eastern Nigeria.

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