Environmental stability of the processing waste from Berg Aukas, a sulfide mining district of Namibia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F14%3A00000265" target="_blank" >RIV/00025798:_____/14:00000265 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Environmental stability of the processing waste from Berg Aukas, a sulfide mining district of Namibia

Popis výsledku v původním jazyce

Kinetic batch leaching of the flotation wastes from Berg Aukas mining district (northern Namibia) in 500 ?M solutions of citric, oxalic and acetic acid was performed to simulate the release of trace metals in the rhizosphere-like environment. The obtained data demonstrate that citric acid may significantly contribute to mineral waste alteration accompanied by contaminant mobilization; the maximum dissolution rates corresponded to 2% (Cd), 0.8% (Pb) and 0.3% (Zn) of their total amounts. In contrast, therole of oxalic and acetic acid in the complex process of contaminant leaching was usually negligible and comparable with water. The precipitation of newly formed Fe (hydr)oxides followed by the adsorption of Pb, Cd and eventually Zn from the model solutions, seems to be the key mechanism which led to the metals´ stabilization, as predicted by speciation modeling.

Název v anglickém jazyce

Environmental stability of the processing waste from Berg Aukas, a sulfide mining district of Namibia

Popis výsledku anglicky

Kinetic batch leaching of the flotation wastes from Berg Aukas mining district (northern Namibia) in 500 ?M solutions of citric, oxalic and acetic acid was performed to simulate the release of trace metals in the rhizosphere-like environment. The obtained data demonstrate that citric acid may significantly contribute to mineral waste alteration accompanied by contaminant mobilization; the maximum dissolution rates corresponded to 2% (Cd), 0.8% (Pb) and 0.3% (Zn) of their total amounts. In contrast, therole of oxalic and acetic acid in the complex process of contaminant leaching was usually negligible and comparable with water. The precipitation of newly formed Fe (hydr)oxides followed by the adsorption of Pb, Cd and eventually Zn from the model solutions, seems to be the key mechanism which led to the metals´ stabilization, as predicted by speciation modeling.

Druh

D - Stať ve sborníku

CEP obor

DD - Geochemie

OECD FORD obor

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Projekt

<a href="/cs/project/GAP210%2F12%2F1413" target="_blank" >GAP210/12/1413: Vliv těžby a úpravy rud na životní prostředí v Namibii: Modelování migrace polutantů v půdách, rostlinách a podzemních vodách</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Addressing environmental and health impacts of active and abandoned mines in Sub-Saharan Africa. Proceedings of the Closing Workshop of the IGCP/SIDA Projects 594 and 606,Prague, Czech Republic, May 26?28, 2014

ISBN

978-80-7075-858-8

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

193-195

Název nakladatele

Czech geological survey

Místo vydání

Prague

Místo konání akce

Praha

Datum konání akce

26. 5. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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