Dry disposal of bauxite residues in abandoned mine open pits

Xenidis, A; Boufounos, D

dc.contributor.author	Xenidis, A	en
dc.contributor.author	Boufounos, D	en
dc.date.accessioned	2014-03-01T02:51:35Z
dc.date.available	2014-03-01T02:51:35Z
dc.date.issued	2008	en
dc.identifier.issn	08950563	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35582
dc.subject.other	Al-concentration	en
dc.subject.other	Alkaline slurry	en
dc.subject.other	Annual precipitation	en
dc.subject.other	Bauxite residue	en
dc.subject.other	Drainage water	en
dc.subject.other	Environmentally safe	en
dc.subject.other	Field scale	en
dc.subject.other	Field test	en
dc.subject.other	High NA	en
dc.subject.other	Land disposal	en
dc.subject.other	Leachate	en
dc.subject.other	Open pit	en
dc.subject.other	Optimum moisture content	en
dc.subject.other	Process streams	en
dc.subject.other	Solids content	en
dc.subject.other	Vegetation cover	en
dc.subject.other	Waste rocks	en
dc.subject.other	Abandoned mines	en
dc.subject.other	Leaching	en
dc.subject.other	Mines	en
dc.subject.other	Mining	en
dc.subject.other	Open pit mining	en
dc.subject.other	Pollution	en
dc.subject.other	Sodium	en
dc.subject.other	Solid wastes	en
dc.subject.other	Wastewater disposal	en
dc.subject.other	Waste management	en
dc.title	Dry disposal of bauxite residues in abandoned mine open pits	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1061/40970(309)5	en
heal.identifier.secondary	http://dx.doi.org/10.1061/40970(309)5	en
heal.publicationDate	2008	en
heal.abstract	Bauxite residues exit the process stream as a highly alkaline slurry with low solids content rendering their land disposal a difficult issue. The objective of this study was to develop a methodology for environmentally safe dry disposal of bauxite residues in abandoned mine open pits. The methodology includes dewatering and controlled disposal of bauxite residues, capping with waste rock or treated bauxite residues and, finally, development of a vegetation cover. This methodology is mainly based on bauxite residue properties, which possess low hydraulic conductivity if compacted at optimum moisture content. Several parts of this scheme were investigated at laboratory and pilot field scale. Simulation of an abandoned mine that was planned to be rehabilitated was also performed. Based on the results obtained, the main risk due to bauxite residues disposal is associated with the alkalinity of the material and initially high Na and Al concentrations in the leachate that progressively decrease due to the depletion of these elements. Both the field tests and simulation indicate that the amount of drainage water will be minimal, i.e. approximately 3% of the annual precipitation. Copyright ASCE 2008.	en
heal.journalName	Geotechnical Special Publication	en
dc.identifier.doi	10.1061/40970(309)5	en
dc.identifier.issue	177	en
dc.identifier.spage	40	en
dc.identifier.epage	47	en