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Process Removes Metals from Acid Mine Drainage

Pilot plant experiments demonstrated that 3 stage chemical treatment was required for the effective removal of metals from acid mine drainage. The pH was first adjusted with sodium carbonate, then iron and manganese were precipitated following oxidation with chlorine and potassium permanganate respe...

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Published in:	Water environment & technology 1992-07, Vol.4 (7), p.26-28
Main Authors:	Boling, Scott D., Kobylinski, Edmund A., Michael, James I.
Format:	Magazinearticle
Language:	English
Subjects:	Acute toxicity Aluminum Cadmium Chemical precipitation Copper Iron Lead Manganese News Sulfides Zinc
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creator	Boling, Scott D. Kobylinski, Edmund A. Michael, James I.
description	Pilot plant experiments demonstrated that 3 stage chemical treatment was required for the effective removal of metals from acid mine drainage. The pH was first adjusted with sodium carbonate, then iron and manganese were precipitated following oxidation with chlorine and potassium permanganate respectively; aluminium was also removed at this stage. A one-step lime-soda ash softening at pH 10.5 removed further metals as hydroxides and carbonates. Finally, sulphide precipitation attained the necessary low metal levels. Temperatures close to freezing adversely affected the process, principally by slowing the reactions. Good solids capture was necessary at all stages and this would require the use of polymers for the sulphide precipitation.
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ispartof	Water environment & technology, 1992-07, Vol.4 (7), p.26-28
issn	1044-9493 1938-193X
language	eng
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source	JSTOR Archival Journals and Primary Sources Collection
subjects	Acute toxicity Aluminum Cadmium Chemical precipitation Copper Iron Lead Manganese News Sulfides Zinc
title	Process Removes Metals from Acid Mine Drainage
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