Surface characterization of arsenopyrite during chemical and biological oxidation

被引：44

作者：

Deng, Sha ^{[1
]}

Gu, Guohua ^{[1
]}

Xu, Baoke ^{[1
]}

Li, Lijuan ^{[1
]}

Wu, Bichao ^{[1
]}

机构：

[1] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2018年 / 626卷

基金：

中国国家自然科学基金;

关键词：

Arsenopyrite; Surface properties; S-XRD; XANES; Passivation; ACID-MINE DRAINAGE; RAY-ABSORPTION SPECTROSCOPY; ACIDITHIOBACILLUS-FERROOXIDANS; ELECTROCHEMICAL OXIDATION; BACTERIAL OXIDATION; PYRITE; CHALCOPYRITE; FEASS; GOLD; IRON;

D O I：

10.1016/j.scitotenv.2018.01.099

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The surface properties of arsenopyrite during chemical and biological oxidation were investigated by synchrotron X-ray diffraction (S-XRD), X-ray absorption near-edge structure (XANES) and scanning electron microscope (SEM), accompanying with leaching behaviors elucidation. The moderate thermophile S. thermosulfidooxdians was used as the bioleaching microorganism. Leaching experiments showed that only 16.26% and 44.37% of total arsenic extractions were obtained for sterile acid and culture medium controls, whereas 79.20% of total arsenic was recovered at the end of bioleaching. SEM indicated that new products were layered on the surface of arsenopyrite after chemical and biological oxidation. As displayed in S-XRD patterns, scorodite and elemental sulfur were formed after acid leaching, while only elemental sulfur was detected in the residue leached by acid culture medium. During bioleaching, elemental sulfur was produced from day 4 and jarosite was produced from day 9. The results of iron and arsenic Ledge XANES were in good consistence with S-XRD. The accumulation of scarodile and jarosite on arsenopyrile surface should be the main reason for the hindered dissolution of arsenopyrite during acid leaching and bioleaching. These studies are pretty meaningful for better understanding the oxidation mechanism of arsenopyrite and evaluating arsenic risk to the environment. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：349 / 356

页数：8

共 38 条

[1] Synchrotron XPS studies of solution exposed chalcopyrite, bornite, and heterogeneous chalcopyrite with bornite [J].

Acres, Robert G. ;

Harmer, Sarah L. ;

Beattie, David A. .

INTERNATIONAL JOURNAL OF MINERAL PROCESSING, 2010, 94 (1-2) :43-51

[2]

BARRETT J, 1993, FEMS MICROBIOL REV, V11, P57, DOI 10.1111/j.1574-6976.1993.tb00267.x

[3] A STUDY OF THE SURFACE OXIDATION OF ARSENOPYRITE USING CYCLIC VOLTAMMETRY [J].

BEATTIE, MJV ;

POLING, GW .

INTERNATIONAL JOURNAL OF MINERAL PROCESSING, 1987, 20 (1-2) :87-108

[4] THE SURFACE-COMPOSITION OF ARSENOPYRITE EXPOSED TO OXIDIZING ENVIRONMENTS [J].

BUCKLEY, AN ;

WALKER, GW .

APPLIED SURFACE SCIENCE, 1988, 35 (02) :227-240

[5]

Carvalho L., 1998, Restoration, V1, P13

[6] The oxidative dissolution of arsenopyrite (FeAsS) and enargite (Cu3AsS4) by Leptospirillum ferrooxidans [J].

Corkhill, C. L. ;

Wincott, P. L. ;

Lloyd, J. R. ;

Vaughan, D. J. .

GEOCHIMICA ET COSMOCHIMICA ACTA, 2008, 72 (23) :5616-5633

[7] Surface characterization of arsenopyrite in acidic medium by triangular scan voltammetry on carbon paste electrodes [J].

Cruz, R ;

Lazaro, I ;

Rodriguez, JM ;

Monroy, M ;

Gonzalez, I .

HYDROMETALLURGY, 1997, 46 (03) :303-319

[8]

Dutrizac J.E., 1976, CAN MINERAL, V14, P151, DOI DOI 10.1016/J.HYDROMET.2003.07.009

[9] Arsenopyrite and pyrite bioleaching: evidence from XPS, XRD and ICP techniques [J].

Fantauzzi, Marzia ;

Licheri, Cristina ;

Atzei, Davide ;

Loi, Giovanni ;

Elsener, Bernhard ;

Rossi, Giovanni ;

Rossi, Antonella .

ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 2011, 401 (07) :2237-2248

[10] OCCURRENCES AT MINERAL BACTERIA INTERFACE DURING OXIDATION OF ARSENOPYRITE BY THIOBACILLUS-FERROOXIDANS [J].

FERNANDEZ, MGM ;

MUSTIN, C ;

DEDONATO, P ;

BARRES, O ;

MARION, P ;

BERTHELIN, J .

BIOTECHNOLOGY AND BIOENGINEERING, 1995, 46 (01) :13-21

← 1 2 3 4 →