Physico-chemical processes in acid mine drainage in coal mining, south Brazil

Química Nova

Campaner, Veridiana Polvani¹  Universidade Estadual de Campinas, Campinas, Brasil¹  Luiz-Silva, Wanilson¹ 

关键词: acid mine drainage;    metal contamination;    treatment with CaO.;   

DOI  :  10.1590/S0100-40422009000100028

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Acid mine drainage generated from coal mine showed a pH of 3.2, high concentrations of SO42-, Al, Fe, Mn, Zn and minor As, Cd, Co, Cr, Cu, Ni and Pb. The major reduction in the concentration occurred for Al, As, Cr, Fe and Pb after the treatment with CaO. The evolution of these acid waters within the tributary stream showed decreasing concentration for all soluble constituents, except Al. This natural attenuation was controlled by pH (6.4 to 10.8) as a result of concurrent mixing with tributary stream and reaction with local bedrock that contains limestone. Aluminum increasing concentration during this evolution seems to be related to an input of Al-enriched waters due to the leaching of silicate minerals in alkaline conditions.

【 授权许可】

Unknown