Evolution Assessment of Soils Contaminated by Roasted Pyrite Wastes

Management concern of the wastes generated during the production of sulphuric acid by pyrite roasting was low or nonexistent during the second half of the twentieth century in Spain. An on-site remediation work has been performed to stabilize about 15,000 m3 of ashes produced after the roasting of p...

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Bibliographic Details
Published in:Procedia earth and planetary science 2017, Vol.17, p.432-435
Main Authors: Domènech, Cristina, Canals, Àngels, Soler, Albert, Sabanès, Albert, Dumestre, Alain
Format: Article
Language:English
Subjects:
acid leachate
jarosite
remediation
roasted pyrite wastes
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Summary:Management concern of the wastes generated during the production of sulphuric acid by pyrite roasting was low or nonexistent during the second half of the twentieth century in Spain. An on-site remediation work has been performed to stabilize about 15,000 m3 of ashes produced after the roasting of pyrites that have been identified as a source of acid and high metal concentration leachates polluting groundwater. The ashes are mainly formed by hematite and jarosite, with fewer amounts of anglesite, gypsum, scorodite and calcite. Acid pH generation is interpreted to be consequence of jarosite dissolution and Fe oxy-hydroxides precipitation, although addition of Ca(OH)2 or dissolution of feldspars contribute to an increase of pH up to neutral values. Pb and As form own minerals, which would control their concentration in porewaters. Zn, Ni or Cu are preferentially sorbed onto Fe-oxy-hydroxides.
ISSN:1878-5220
1878-5220
DOI:10.1016/j.proeps.2016.12.109