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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