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Acid Mine Drainage Literature Review

933 Words4 Pages

Course Code CHMT 3004
Course Name Chemical Engineering Laboratory
Assignment Details Literature Review_ Water
Assignment Due Date 22-02-2016

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• I confirm that the work submitted for assessment for the above course is my own unaided work.
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• I understand that the University of the Witwatersrand may take disciplinary action against us if there is a belief that this is not my own unaided work or that I have failed to acknowledge the source of the ideas or words in my/our …show more content…

The water based product is usually acidic in nature and has high specific conductivity. It is mostly observed from the abandoned areas where coal or sulphur bearing minerals such as pyrite were mined.
Mechanism of Acid Mine Drainage

Acid mine drainage is a product of a chemical reaction. Let me illustrate the reactions of acid mine reactions by examining the oxidation of pyrite (FeS2) which constitute one of the most common sulphide bearing minerals.
Firstly sulphide mineral is oxidised to form dissolved iron, sulphate and hydrogen, by the following chemical reaction. (Evangelou, V.P, 1998)
2FeS2+7O2+H2O→2Fe2+ +4SO4 2- +4H+ (Evangelou, V.P, 1998) (1)
These dissolved chemical products represent an increase in solids and acidity of the water. Due to an exposure to oxidizing environment such as oxygen in the atmosphere, ferrous ions decompose further according to the following chemical reaction: (Evangelou, V.P, 1998)
4Fe2+ + O2+4H+→4Fe3+ +2H2O (Evangelou, V.P, 1998) (2)
Fe3+ precipitates as Fe (OH) 3 thus further lowering

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