Use of Steel Slag Leach Beds for the Treatment of Acid Mine Drainage

Simmons, Jennifer; Ziemkiewicz, Paul; Black, D. Courtney

doi:10.1007/s102300200024

Cited by 53 publications

(23 citation statements)

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“…A partir de então, a lixiviação dos metais foi bastante baixa. 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 (Simmons et al, 2002). Os teores de sulfato também são bastante baixos, demonstrando que a oxidação da pirita foi bastante reduzida.…”

Section: Resultsunclassified

Ensaios estáticos e cinéticos para a prevenção da geração de drenagem ácida de minas da mineração de carvão com escória de aciaria

Machado

Schneider

2008

Rem: Rev. Esc. Minas

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The Acid Mine Drainage (AMD) ResumoA Drenagem Ácida de Mina (DAM) é proveniente da oxidação natural de materiais sulfetados quando em contato com o ar e com a água. Esse problema atinge, em alto grau, a mineração de carvão. Uma das tecnologias de prevenção da geração da DAM consiste no método de aditivos alcalinos. Assim, o objetivo do presente trabalho foi avaliar, em estudos de laboratório, o controle da DAM pela mistura de um rejeito de carvão com uma escó-ria do setor siderúrgico. O trabalho incluiu a coleta de uma amostra de rejeito de carvão de uma mineração de carvão e de uma amostra de escória de uma usina siderúr-gica semi-integrada, ambas situadas no Estado do Rio Grande do Sul. Determinaram-se o potencial de geração de acidez e o potencial de neutralização dos materiais pelo método de contabilização de ácidos e bases. Após, realizaram-se ensaios cinéticos em células úmidas pelo Método ASTM D 5744-96. 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 em uma proporção de 4,8:1. Os ensaios cinéticos demonstram que, nessa condição, ocorre um aumento do pH e uma redução na liberação de acidez, metais e sulfatos na água lixiviada. Desta forma, foi demonstrado que a disposição conjunta de escória de aciaria com rejeito de carvão é uma alternativa viável para o controle da geração de DAM em minerações de carvão. Palavra-chave: Drenagem ácida de mina, escória, aditivos alcalinos.

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Section: Resultsunclassified

Ensaios estáticos e cinéticos para a prevenção da geração de drenagem ácida de minas da mineração de carvão com escória de aciaria

Machado

Schneider

2008

Rem: Rev. Esc. Minas

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“…Although the chemical composition of steel slag varies with different slag production processes, normally it consists of CaO, SiO2, FeO, MgO, Al2O3,MnO,P2O5,etc. (Shi, 2004) Steel slag has been used for treating acid mine drainage since its alkaline compounds such as lime and magnesia can leach out, creating high levels of alkalinity (Simmons et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Waste activated sludge hydrolysis and acidification: A comparison between sodium hydroxide and steel slag addition

Zhang

et al. 2016

Journal of Environmental Sciences

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Waste activated sludge hydrolysis and acidification: a comparison between sodium hydroxide and steel slag addition AbstractAlkaline treatment with steel slag and NaOH addition were investigated under different pH conditions for the fermentation of waste activated sludge. Better performance was achieved in steel slag addition scenarios for both sludge hydrolysis and acidification. More solubilization of organic matters and much production of higher VFA (volatile fatty acid) in a shorter time can be achieved at pH. 10 when adjusted by steel slag. Higher enzyme activities were also observed in steel slag addition scenarios under the same pH conditions. Phosphorus concentration in the supernatant increased with fermentation time and pH in NaOH addition scenarios, while in contrast most phosphorus was released and captured by steel slag simultaneously in steel slag addition scenarios. These results suggest that steel slag can be used as a substitute for NaOH in sludge alkaline treatment. AbstractAlkaline treatment with steel slag and NaOH addition were investigated at different pH conditions for the fermentation of waste activated sludge. Better performance was achieved in steel slag addition scenarios for both sludge hydrolysis and acidification.More solubilization of organic matters and much higher (volatile fatty acids) VFAs production at a shorter time can be achieved at pH 10 adjusted by steel slag. Higher enzyme activities were also observed in steel slag addition scenarios under same pH conditions. Phosphorus concentration in supernatant increased with fermentation time and pH in NaOH addition scenarios while in contrast most phosphorus were released and captured by steel slag simultaneously in steel slag addition scenarios. These results suggest that steel slag can be used as a substitute for NaOH in sludge alkaline treatment.

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“…The reduction in pH, in turn, accelerates the oxidation of sulfide minerals, increasing the activity of the elements As, Fe and S in solution. Higher pH inhibits the oxidation of pyrite (FeS 2 ) and reduces the solubility of the metals (Simmons et al, 2002). Therefore, the reduction in the available contents of As, Fe and S in the substrate due to the increment in the doses of P, at least in part, results from increments in pH.…”

Section: Resultsmentioning

confidence: 99%

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Guimarães

Dias

Assis

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe processing of gold ores exploited in Paracatu, MG, generates tailings that are challenging for revegetation, mainly because of the high content of arsenic and salinity. Aiming at the revegetation of the area of disposal of these tailings, the objective of this study was to evaluate the effects of phosphorus doses on vetiver plants (Chrysopogon zizanioides) and on the planting substrate, which consisted of tailings from the processing of ore named B1, exploited in Paracatu, with water restriction. Vetiver was grown for four months in the substrate under doses of 0, 140, 280, 560 and 1280 mg kg -1 of P 2 O 5 . Increasing doses of phosphorus improved the chemical characteristics of the substrate. However, the highest dose (1280 mg kg -1 P 2 O 5 ) resulted in higher toxicity of arsenic for the plants. Under the evaluated conditions, the dose of 560 mg kg -1 of P 2 O 5 is the most suitable for the fertilization of vetiver and, therefore, also for the revegetation of the substrate. Vetiver survives under low availability of water in the tailings.Cultivo de vetiver em um rejeito salino contaminado com arsênio sob doses de fósforo IntroductionSome ores exploited for gold production may contain toxic elements, such as arsenic (As), in their composition, causing environmental problems. In Brazil, gold and iron mining has contributed to the dispersion of As and its entry in the food chain (Campos et al., 2006).The tailings produced in the processing of gold ores exploited in Paracatu, MG, Brazil, have limiting characteristics to plant growth, especially acidity, salinity and high As concentrations, which compromise the process of revegetation of the basin where they are disposed. A practice that can facilitate the establishment of plants in these tailings is phosphate fertilization.The addition of P has been reported as inhibitor of As absorption (Lei et al., 2012). Phosphate and arsenate are chemically similar and share the same membrane transporters in root cells, and the transporters have higher affinity for the phosphate (Tu & Ma, 2003;Zhao et al., 2008).Besides phosphate fertilization, plants tolerant to As and to salinity may have promising responses for the revegetation of tailings. One species with desirable characteristics to start the process of revegetation is Chrysopogon zizanioides (vetiver). The species, besides having high biomass production, has high tolerance and capacity of accumulation of contaminants (Singh et al., 2007).In this context, this study aimed to evaluate the effects of P doses on vetiver plants and on the planting substrate, which consisted of tailings from the processing of one of the gold ores exploited in Paracatu, MG, Brazil, subjected to water restriction. Material and MethodsThe substrate consisted of tailings from the processing of B1 ore, which is a highly weathered phyllite, with sulfide contents around 3.0 g kg -1 , collected in Paracatu, MG, Brazil. Three samples of the substrate were collected for its initial characterization, through the determination of pH i...

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Use of Steel Slag Leach Beds for the Treatment of Acid Mine Drainage

Cited by 53 publications

References 0 publications

Ensaios estáticos e cinéticos para a prevenção da geração de drenagem ácida de minas da mineração de carvão com escória de aciaria

Ensaios estáticos e cinéticos para a prevenção da geração de drenagem ácida de minas da mineração de carvão com escória de aciaria

Waste activated sludge hydrolysis and acidification: A comparison between sodium hydroxide and steel slag addition

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

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