PHYSICO-CHEMICAL PROCESSES IN ACID MINE DRAINAGE IN COAL MINING, SOUTH BRAZIL

被引：29

作者：

Campaner, Veridiana Polvani ^{[1
]}

Luiz-Silva, Wanilson ^{[1
]}

机构：

[1] Univ Estadual Campinas, Dept Geol & Recursos Nat, Inst Geociencias, BR-13083970 Campinas, SP, Brazil

来源：

QUIMICA NOVA | 2009年 / 32卷 / 01期

关键词：

acid mine drainage; metal contamination; treatment with CaO; LIMESTONE DRAINS; CHEMISTRY; NEUTRALIZATION; WATER; CARBONATE; MANGANESE; SYSTEMS; METALS; BASIN; ASH;

D O I：

10.1590/S0100-40422009000100028

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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.

引用

页码：146 / 152

页数：7

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