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

Machado, Luciana Angelita; Schneider, Ivo

doi:10.1590/s0370-44672008000300011

Cited by 7 publications

(10 citation statements)

References 3 publications

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“…The pH measurements graph of the leach extraction tests, shown in Figure 3(a), indicates consistent results compared with tests by Machado and Schneider (2008) who studied sulfide coal tailings from a region in southern Brazil mixed with steel slag.…”

Section: Geochemical Resultssupporting

confidence: 80%

“…A pH in the range of 6-8 can be considered within a neutral "range" according to the Canadian MEND Program ( 2009). The M25 pH was neutral after 100 days at a proportion of 1:3 that was suggested by Machado and Schneider (2008) to neutralize sulfide coal tailings.…”

Section: Geochemical Resultsmentioning

confidence: 82%

“…Therefore, calcite is present in steel slag as has been proven in laboratory and field tests developed by Ziemkiewicz and Skousen (1998). Machado and Schneider (2008) conducted leachate extraction tests with mixtures of steel slag and coal sulfide tailings. As result of these tests, the optimal ratio of each material was established.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles

2015

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The extraction of gold, coal, nickel, uranium, copper and other earth-moving activities almost always leads to environmental damage. In metal and coal extraction, exposure of sulfide minerals to the atmosphere leads to generation of acid rock drainage (ARD) and in underground mining to acid mine drainage (AMD) due to contamination of infiltrating groundwater. This study proposes to develop a reactive cover system that inhibits infiltration of oxygen and also releases alkalinity to increase the pH of generated ARD and attenuate metal contaminants at the same time. The reactive cover system is constructed using steel slag, a waste product generated from steel industries. This study shows that this type of cover system has the potential to reduce some of the adverse effects of sulfide mine waste disposal on land. Geochemical and geotechnical characterization tests were carried out. Different proportions of sulfide mine waste and steel slag were studied in leachate extraction tests. The best proportion was 33% of steel slag in dry weight. Other tests were conducted as follows: soil consolidation, saturated permeability and soil water characteristic curve. The cover system was numerically modeled through unsaturated flux analysis using Vadose/w. The solution proposed is an oxygen transport barrier that allows rain water percolation to treat the ARD in the waste rock pile. The results showed that the waste pile slope is an important factor and the cover system must have 5 m thickness to achieve an acceptable effectiveness.

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Section: Geochemical Resultssupporting

confidence: 80%

Section: Geochemical Resultsmentioning

confidence: 82%

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Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles

2015

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“…Among the main kinetic methods, we highlight the following: humidity cell, Soxhlet extractor, leaching column and B.C. (British Columbia) confirmation kinetic tests (US EPA, 1994, Blowes et al, 2003, Machado & Schneider, 2008, Mend Report, 2009.…”

Section: Mineraçãomentioning

confidence: 99%

Assessment of two kinetic tests to predict the acid mine drainage in waste rock samples of a uranium mine

Abreu

Faria

Chaves

et al. 2014

Rem: Rev. Esc. Minas

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Acid mine drainage is the result of the oxidation process of sulfide bearing rocks. This process occurs when the sulfide material is exposed to atmospheric conditions. Under these conditions, successive oxidation reactions yield sulfuric acid generating acidic waters. This problem becomes more serious when the surrounding rocks are not able to neutralize the acid. The low pH condition of the drained water accelerates the solubility process of solid materials (rocks, soils and sediments) and favors metal and metalloid leaching making them available to the environment, which impairs the hydric system quality. This is a quite common situation at abandoned mines where the material is exposed, as at theOsamu Utsumi Mine in Caldas, MG. The main goal of this work was to assess and compare two kinetic tests in an attempt to predict the acid generation from the waste rock of the Osamu Utsumi Mine. The tests were carried out using a Soxhlet extractor and a leaching column. The leachate from the two tests was analyzed for the physical-chemical parameters (pH, Eh and electric conductivity) and metals and metalloids.

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“…As principais alternativas consideradas são coberturas secas (Galatto et al, 2007;Schneider 2006;Soares et al, 2008), aditivos alcalinos (Machado & Schneider, 2008) e tratamento ativo da DAM (Possa & Santos, 2003;Silveira et al, 2009). Uma outra opção é a concentração/isolamento de sulfetos.…”

Section: Introductionunclassified

Caracterização de um depósito de rejeitos para o gerenciamento integrado dos resíduos de mineração na região carbonífera de Santa Catarina, Brasil

Filho

Schneider

Brum

et al. 2013

Rem: Rev. Esc. Minas

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ResumoO carvão mineral brasileiro contém altos teores de impurezas (pirita e minerais de rochas sedimentares), sendo necessário seu beneficiamento. Os rejeitos do beneficiamento demandam uma grande área física para a sua disposição, modificam a topografia e geram a drenagem ácida de minas (DAM). O objetivo desse trabalho foi caracterizar um típico depósito de rejeitos na região carbonífera de Santa Catarina, buscando a separação de três frações para uso futuro: (a) uma fração para a geração de energia; (b) uma fração enriquecida em silicatos; e (c) uma fração com alto teor de enxofre. A metodologia do trabalho consistiu na amostragem e caracterização do material. A caracterização incluiu análise granulométrica, estudos densimétricos, medidas do teor de cinzas e enxofre, análise mineralógica por DRX, estudos petrográficos em lupa e medidas de contabilização de ácidos e bases. Os resultados granulométricos indicaram que 68% do material é composto por partículas grossas, 15%, por partículas finas e 17%, pelo lodo das bacias de sedimentação. Com o beneficiamento gravimétrico dos resíduos é possível uma recuperação teórica do material de 33,7% para geração de energia e 10,3% para produção de um concentrado rico em pirita. O material restante, com menor quantidade de enxofre e rico em silicatos, tem seu potencial de geração de acidez reduzido em 60% e apresenta possibilidade de uso na construção civil. Palavras

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

Cited by 7 publications

References 3 publications

Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles

Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles

Assessment of two kinetic tests to predict the acid mine drainage in waste rock samples of a uranium mine

Caracterização de um depósito de rejeitos para o gerenciamento integrado dos resíduos de mineração na região carbonífera de Santa Catarina, Brasil

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