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Factors affecting arsenic mobility from hydrothermally altered rock in impoundment-type in situ experiments

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Title: Factors affecting arsenic mobility from hydrothermally altered rock in impoundment-type in situ experiments
Authors: Tabelin, Carlito B. Browse this author
Igarashi, Toshifumi Browse this author →KAKEN DB
Tamoto, Shuichi Browse this author
Keywords: Leaching
oxidation
redox reactions
Issue Date: Feb-2010
Publisher: Elsevier
Journal Title: Minerals Engineering
Volume: 23
Issue: 3
Start Page: 238
End Page: 248
Publisher DOI: 10.1016/j.mineng.2009.09.019
Abstract: This paper describes the factors affecting arsenic (As) mobility from hydrothermally altered rock under in-situ conditions. Four impoundments were built on site with rectangular base, truncated-pyramid structures. Impoundment 1 was composed solely of the hydrothermally altered rock while impoundments 2, 3 and 4 were covered with different types of silty covering soil in order to minimize O2 and water intrusion into the rock. The results indicate that seasonal variations in temperature, O2 concentration and volumetric water content in the impoundments strongly influenced As leaching. When the temperature was high and the water content low, oxidation of sulfide minerals in the rock was enhanced because of a higher air-water-rock interaction. Concentration of As in the porewater increased when it rained after a specific period of dry weather. The use of a silty covering soil influenced the concentrations of As and SO_[4]^[2-] in the porewater although it did not affect the pH and Eh significantly. In this case, O2 and water movement might be the rate controlling step of As leaching, that is, if there is no covering soil on the impoundment, more As will leach out from the rock. The use of a silty covering soil showed promise of reducing As leaching from the waste rock, but utilizing it alone was insufficient to effectively prevent As release from the rock. A combination of covering soil and bottom As-adsorption layer to incorporate any As released from the rock is therefore recommended.
Type: article (author version)
URI: http://hdl.handle.net/2115/47800
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 五十嵐 敏文

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