An investigation of Acid Rock Drainage (ARD) occurrence in a gold mine located in a Southeastern Brazil region

Capanema, Luciana Xavier de Lemos; Ciminelli, Virgínia S. T.

doi:10.1590/s0370-44672003000300010

Cited by 8 publications

(5 citation statements)

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“…A presença de cádmio, cromo, cobalto, cobre, níquel e chumbo também foi detectada, mas em concentrações menores. [23], que observaram valores elevados de potencial redox favorecem a oxidação de materiais sulfetados, com a decorrente diminuição do pH da água lixiviada. Esse fato está associado ao pH mais elevado do meio, que inibe a oxidação da pirita, reduz a solubilidade dos metais e favorece os processos de adsorção de compostos metálicos na matéria mineral [24,25].…”

Section: Resultsunclassified

Estudo De Ensaios Estáticos E Cinéticos Na Previsão E Prevenção Da Drenagem Ácida De Mineração, Com O Uso De Escória De Aciaria Elétrica Do Forno Panela Com Rejeito De Carvão

Machado¹,

Freitas²,

Villetti³

et al. 2014

ABM Proceedings

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ResumoOs rejeitos gerados na mineração de carvão, sob condições atmosféricas e a possível presença de bactérias acidofílicas proporcionam a oxidação primária do sulfeto de ferro, formando sulfatos e ácido sulfúrico. Com a redução do pH da água, ocorre a mobilização de metais contidos no material, gerando a drenagem ácida de mina (DAM). A DAM causa um impacto nocivo na qualidade da água superficial ou subterrânea. Uma das tecnologias de prevenção da geração da DAM consiste no método de aditivos alcalinos. Assim, o objetivo do presente trabalho foi avaliar o controle da DAM pela mistura de rejeito de carvão com escória de aciaria elétrica do forno panela. A metodologia utilizada baseou-se nos ensaios estáticos e ensaios cinéticos. Os resultados demonstram que o rejeito de carvão gera DAM. Contudo os problemas ambientais podem ser em grande parte resolvidos pela mistura do rejeito com a escória na proporção acima de 10:10. Os ensaios cinéticos demonstram que, nessa condição, ocorre aumento do pH e redução do potencial redox e sulfatos na água lixiviada. Desta forma, a disposição conjunta de escória de aciaria elétrica do forno panela com rejeito de carvão é uma alternativa viável para o controle da geração de DAM em minerações de carvão. Abstract The waste generated in coal mining, under atmospheric conditions and the possible presence of acidophilic bacteria provides the primary oxidation of iron sulfide, forming sulfates and sulfuric acid. With the reduction of the water pH, the mobilization of metals contained in the material occurs, generating acid mine drainage (AMD). The AMD causes an adverse impact on surface or groundwater quality. One of the technologies to prevent the AMD is the alkaline additives method. The objective of this study was to evaluate the AMD control by mixing tailings with the ladle slag of electric steelmaking. The used methodology was based on static tests and kinetic assays. The results demonstrate that coal tailings generates AMD. However, the environmental problems can be largely solved by mixing the waste with the slag in the ratio of 10:10. The kinetic experiments demonstrate that, in this condition, there is an increase of pH and a reduction on the redox potential and in the sulphate in the leach water. Thus, the combined disposal of ladle slag of electric steelmaking with coal waste is a viable alternative to control the generation of AMD in coal mining.

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Section: Resultsunclassified

Estudo De Ensaios Estáticos E Cinéticos Na Previsão E Prevenção Da Drenagem Ácida De Mineração, Com O Uso De Escória De Aciaria Elétrica Do Forno Panela Com Rejeito De Carvão

Machado¹,

Freitas²,

Villetti³

et al. 2014

ABM Proceedings

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“…However, the presence of slag, in both ratio of the 1:1 and 1:1.5, increased the pH, decreased the Eh, and reduced the concentration of metals and sulfate in the leachate. This condition inhibits the oxidation of pyrite, reduces the solubility of the metal and promotes the adsorption of metal compounds on mineral matter [22][23][24].…”

Section: Resultsmentioning

confidence: 99%

Ladle Slag of Electric Steelmaking as Alkaline Agent on Controlling of Acid Mine Drainage Generation

Machado¹,

Freitas²,

Villetti³

et al. 2013

JEP

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Commercial coal production in the southern region of Brazil (comprising the Paraná, Santa Catarina, and Rio Grande do Sul states) has been occurring since the beginning of the twentieth century. Regarding the Santa Catarina coalfields, about 60% -65% of the ROM coal is discharged at dump deposits as waste. These wastes can lead to the formation of acid mine drainage (AMD), a source of ground and surface water pollution. One of the technologies used for preventing AMD consists of the alkaline additive method. Thus, the aim of this work was to study, at laboratory scale, the DAM control by blending coal waste with a metallurgical slag. A coal-tailing sample was collected from a coal mine, and the slag was obtained from a semi-integrated steel plant. Static tests were carried out by the acid-base account method to determine the balance between the acid-producing and acid-consuming (neutralizing) mineral components of the samples. Kinetic tests were conducted in humidity cells, following the ASTM D 5744-96 method, for a period of 80 weeks. The results showed that the coal tailing generates AMD. However, environmental problems can be minimized by mixing the coal waste with the metallurgical slag in 1:1 or 1:1.5 proportions. The kinetic experiments proved that, in this condition, the lixiviation presents a higher pH and a lower concentration of acidity, metals, and sulfate. Finally, it is possible to conclude that the blending slag in coal tailing deposits can be a viable alternative for DAM control in coal mining.

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“…Indeed, comparative studies between methods have reported different ANC values. For example, Capenema and Ciminelli (2003) identified the modified Sobek method as more accurate when characterising three sulphidic ore samples. Morin (2009) reported that Sobek ANC values when compared to modified methods showed variations (either higher or lower) 40-60% of the time when properly conducted.…”

Section: Acid Base Accountingmentioning

confidence: 99%

A critical review of acid rock drainage prediction methods and practices

Parbhakar-Fox

Lottermoser

2015

Minerals Engineering

148

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An investigation of Acid Rock Drainage (ARD) occurrence in a gold mine located in a Southeastern Brazil region

Cited by 8 publications

References 0 publications

Estudo De Ensaios Estáticos E Cinéticos Na Previsão E Prevenção Da Drenagem Ácida De Mineração, Com O Uso De Escória De Aciaria Elétrica Do Forno Panela Com Rejeito De Carvão

Estudo De Ensaios Estáticos E Cinéticos Na Previsão E Prevenção Da Drenagem Ácida De Mineração, Com O Uso De Escória De Aciaria Elétrica Do Forno Panela Com Rejeito De Carvão

Ladle Slag of Electric Steelmaking as Alkaline Agent on Controlling of Acid Mine Drainage Generation

A critical review of acid rock drainage prediction methods and practices

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