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Treatment of Acid Mine Drainage using Magnesium Hydroxide and Barium Hydroxide.
- Source :
- Proceedings of the International Conference on Waste Technology & Management; 2012, p1254-1283, 10p
- Publication Year :
- 2012
-
Abstract
- Acid mine drainage, typically produced when pyrites in coal mining overburden is oxidised biologically and by atmospheric oxygen, contains high concentrations of dissolved heavy metals and sulphate, and can have pH values as low as 2.5. Unless treated, such waters can not be discharged into the environment. This study describes a method developed to neutralise acid mine drainage and to remove metals and sulphate. Magnesium hydroxide was used for neutralisation of acid mine drainage, by raising the pH to above pH 7 to enhance the oxidation of Fe(II) and precipitating it as Fe(OH)<subscript>3</subscript> and other metals as hydroxides. Ba(OH)<subscript>2</subscript> was used to precipitate sulphate as BaSO<subscript>4</subscript> and magnesium as Mg(OH)<subscript>2</subscript>. CO<subscript>2</subscript> treatment precipitated calcium as CaCO<subscript>3</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10918043
- Database :
- Supplemental Index
- Journal :
- Proceedings of the International Conference on Waste Technology & Management
- Publication Type :
- Conference
- Accession number :
- 101208960