5
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Processamento de rejeito de carvão visando a redução de custos no tratamento da drenagem ácida de minas - estudo de caso na Região Carbonífera de Santa Catarina Translated title: Coal waste processing to reduce costs related to acid mine drainage treatment - case study in the Carboniferous District of Santa Catarina State

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          RESUMO: Rejeitos de carvão contêm vários minerais, entre os quais a pirita, que se oxida e gera a drenagem ácida de minas (DAM), um efluente ácido com alto poder poluidor. Atualmente, o setor de mineração de carvão brasileiro controla a DAM por meio do tratamento pelo método de neutralização/precipitação de metais, que consome substanciais quantidades de reagentes e gera um grande volume de lodo. O objetivo deste trabalho foi estudar a minimização da geração da DAM por outra abordagem, o método preventivo de isolamento e exclusão de sulfetos. O processo consiste na remoção da pirita da massa de resíduos, reduzindo a geração de acidez e minimizando a carga de metais nas estações de tratamento. A metodologia do trabalho consistiu na separação gravimétrica por meio denso de uma amostra típica de rejeito de carvão, obtendo-se três frações densimétricas: inferior a 2,2, entre 2,2 e 2,7 e superior a 2,7. Cada fração foi submetida às análises imediata e elementar. Também foram realizados ensaios estáticos e cinéticos em células úmidas para avaliação da geração de acidez no rejeito bruto e na fração com densidade intermediária. Os resultados demonstraram que, por intermédio do beneficiamento gravimétrico dos rejeitos, é possível reduzir em 30% o volume de material descartado. Esse material apresenta um potencial de geração de acidez líquido de 80 a 90% inferior ao do rejeito de carvão bruto. Além disso, estima-se que os custos com reagentes no tratamento de águas ácidas produzidas da mineração de carvão possam ser reduzidos em aproximadamente 85%.

          Translated abstract

          ABSTRACT: Coal wastes contain many minerals, including the pyrite, which oxidize and generates the acid mine drainage (AMD), a highly polluting effluent. Currently, the Brazilian coal mining operations emphasise AMD control using waste water treatment systems which consume substantial amounts of reagents and generate large amounts of sludge. The aim of this work was to study the acid mine drainage control by another approach, the sulphide exclusion preventive method. The method comprises in removing the pyrite form coal tailings, reducing the acid generation and minimizing the metals load in wastewater treatment plants. Accordingly, a typical coal waste sample was submitted to a density separation process to divide the sample in the following relative density ranges: below 2.2, from 2.2 to 2.7 and above 2.7. All density fractions were submitted to ultimate and proximate analysis. Static and kinetic tests were carried with the raw waste and the pyrite-free fraction. The results showed that, by gravity processing of coal tailings, it is possible to decrease 30% the volume of wastes. The remaining material presents an acid generation potential of about 80-90% lower than the raw waste. Furthermore, it is expected a reduction in costs of reagents of approximately 85% in acid mine treatment plants.

          Related collections

          Most cited references35

          • Record: found
          • Abstract: not found
          • Article: not found

          Thermogravimetric analysis of the co-combustion of the blends with high ash coal and waste tyres

            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Thermogravimetric investigation on co-combustion characteristics of tobacco residue and high-ash anthracite coal.

            The thermal behavior of high-ash anthracite coal, tobacco residue and their blends during combustion processes was investigated by means of thermogravimetric analysis (20 K min(-1), ranging from ambient temperature to 1273 K). Effects of the mixed proportion between coal and tobacco residue on the combustion process, ignition and burnout characteristics were also studied. The results indicated that the combustion of tobacco residue was controlled by the emission of volatile matter; the regions were more complex for tobacco residue (four peaks) than for coal (two peaks). Also, the blends had integrative thermal profiles that reflected both tobacco residue and coal. The incorporation of tobacco residue could improve the combustion characteristics of high-ash anthracite coal, especially the ignition and burnout characteristics comparing with the separate burning of tobacco residue and coal. It was feasible to use the co-combustion of tobacco residue and high-ash anthracite coal as fuel.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              A comparative study on co-combustion performance of municipal solid waste and Indonesian coal with high ash Indian coal: A thermogravimetric analysis

                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                esa
                Engenharia Sanitaria e Ambiental
                Eng. Sanit. Ambient.
                Associação Brasileira de Engenharia Sanitária e Ambiental - ABES
                1809-4457
                June 2016
                : 21
                : 2
                : 337-345
                Affiliations
                [1 ] Universidade Federal do Rio Grande do Sul Brazil
                [2 ] Universidade Federal do Rio Grande do Sul Brazil
                [3 ] Universidade Federal do Rio Grande do Sul Brazil
                Article
                S1413-41522016000200337
                10.1590/s1413-41522016116411
                bf534a72-b893-47c2-829e-d3d0f5a9d647

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1413-4152&lng=en
                Categories
                WATER RESOURCES

                Oceanography & Hydrology
                tecnologias mais limpas,meio ambiente,coal waste,acid mine drainage (AMD),clean technology,environment,rejeitos de carvão,drenagem ácida de minas (DAM)

                Comments

                Comment on this article