REMEDIAÇÃO DA DRENAGEM ÁCIDA DA MINA DE URÂNIO OSAMU UTSUMI (MG) COM BIOCARVÕES EM BARREIRA REATIVA PERMEÁVEL EM LABORATÓRIO

• DOI: https://doi.org/10.22533/at.ed.6422424046

• Palavras-chave: biocarvão; remediação; drenagem ácida de mina, urânio, terras raras

• Keywords: biochar, remediation, acid mine drainage, uranium, rare earth elements

• Abstract: ABSTRACT: The search for alternative materials to the treatment of acid mine drainage (AMD), either for the neutralization of acidity or for the removal of potentially toxic elements, has been carried out in the search for cost reduction, increased efficiency or material recycling. In this context, in this work, biochars from eucalyptus bark (BCEuc) and sugarcane bagasse (BCCana) were tested in the treatment of AMD at the Osamu Utsumi Uranium mine (MOU). The tests were carried out in the laboratory by percolating the AMD in columns containing the biochars. The biochars were analyzed by XRD, SEM, immediate analysis, infrared spectroscopy (FTIR) and partial ash digestion by the USEPA 3051 method. The experimental solutions were analyzed by inductively coupled plasma optical emission spectroscopy (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS). The mass of biochars required for neutralizing the pH of the AMD from pH=3.77 to pH=5 by the biochars was ~41 kg BCEuc/m 3 AMD and ~83kg BCCana/m 3 AMD or BCCana. There was total retention of Th, and partial retention of As, U and rare earths from AMD. Rare earth precipitates have been identified in biochars after percolation. If the neutralizing capacity is small, the retention of total Th, and partial retention of U and As indicate a potential for using biochars to remove these ions from solutions.