Acid mine drainage formation and arsenic mobility under strongly acidic conditions: Importance of soluble phases, iron oxyhydroxides/oxides and nature of oxidation layer on pyrite

被引：196

作者：

Tabelin, Carlito Baltazar ^{[1
]}

Corpuz, Ryan D. ^{[2
]}

Igarashi, Toshifumi ^{[3
]}

Villacorte-Tabelin, Mylah ^{[4
]}

Alorro, Richard Diaz ^{[5
]}

Yoo, Kyoungkeun ^{[6
]}

Raval, Simit ^{[1
]}

Ito, Mayumi ^{[3
]}

Hiroyoshi, Naoki ^{[3
]}

机构：

[1] Univ New South Wales, Sch Minerals & Energy Resources Engn, Sydney, NSW 2052, Australia

[2] Nanolabs LRC Co Ltd, Quezon City 1105, Philippines

[3] Hokkaido Univ, Fac Engn, Div Sustainable Resources Engn, Sapporo, Hokkaido 0608628, Japan

[4] Mindanao State Univ, Coll Sci & Math, Dept Biol Sci, Iligan Inst Technol, Iligan 9200, Philippines

[5] Curtin Univ, Western Australian Sch Mines Minerals Energy & Ch, Kalgoorlie, WA 6430, Australia

[6] Korea Maritime & Ocean Univ, Dept Energy & Resources Engn, Busan 49112, South Korea

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2020年 / 399卷

基金：

日本学术振兴会;

关键词：

Acid mine drainage; Arsenic; Secondary minerals; Scorodite; Pyrite oxidation; X-RAY PHOTOELECTRON; FERRIC-CATECHOLATE COMPLEXES; ELECTRONIC-STRUCTURE; EXCAVATED ROCK; SURFACE-WATER; SCORODITE; HEMATITE; BORON; ARSENOPYRITE; MECHANISMS;

D O I：

10.1016/j.jhazmat.2020.122844

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Acid mine drainage (AMD) formation and toxic arsenic (As) pollution are serious environmental problems encountered worldwide. In this study, we investigated the crucial roles played by common secondary mineral phases formed during the natural weathering of pyrite-bearing wastes soluble salts (melanterite, FeSO4 center dot 7H(2)0) and metal oxides (hematite, Fe2O3)-on AMD formation and As mobility under acidic conditions (pH 1.5-4) prevalent in historic tailings storage facilities, pyrite-bearing rock dumps and AMD-contaminated soils and sediments. Our results using a pyrite-rich natural geological material containing arsenopyrite (FeAsS) showed that melanterite and hematite both directly-by supplying H+ and/or oxidants (Fe3+)-and indirectly-via changes in the nature of oxidation layer formed on pyrite-influenced pyrite oxidation dynamics. Based on SEM-EDS, DRIFT spectroscopy and XPS results, the oxidation layer on pyrite was mainly composed of ferric arsenate and K-Jarosite when melanterite was abundant with/without hematite but changed to Fe-oxyhydroxide/oxide and scorodite when melanterite was low and hematite was present This study also observed the formation of a mechanically 'strong' coaling on pyrite that suppressed the mineral's oxidation. Finally, As mobility under acidic conditions was limited by its precipitation as ferric arsenate, scorodite, or a Fe/Al arsenate phase, including its strong adsorption to Fe-oxyhydroxides/oxides.

引用

页数：16

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