SPONTANEOUS DEPOSITION OF GOLD ON PYRITE FROM SOLUTIONS CONTAINING AU(III) AND AU(I) CHLORIDES .1. A SURFACE STUDY

被引:95
作者
MYCROFT, JR [1 ]
BANCROFT, GM [1 ]
MCINTYRE, NS [1 ]
LORIMER, JW [1 ]
机构
[1] UNIV WESTERN ONTARIO, DEPT CHEM & SURFACE SCI WESTERN, LONDON, ON N6A 5B7, CANADA
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/0016-7037(95)00211-H
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The adsorption and deposition of Au on the surface of naturally occurring pyrite under ambient conditions has been studied by scanning electron microscopy (SEM), X-ray photoelectron (XPS) and Rutherford backscattering spectrometry (RES). Gold is reduced on the pyrite surface from either Au(I) or Au(III) solutions and tends to nucleate as small spheres at microfractures on the mineral surface; each gold cluster is surrounded by a reaction halo of unknown composition. The rate of Au deposition is approximately inverse first order in Cl- and is independent of AuCl4- and pH. Pyrite is found to be the reducing agent for Au(III); it reacts with surface ferrous iron to produce Au(I) and ferric iron. The Au(I) in turn reacts with pyrite again to form metallic gold. The need for careful interpretation of the XPS binding energy data is shown; the Au 4f(7/2) binding energy is a function of not only oxidation state but also Au particle size.
引用
收藏
页码:3351 / 3365
页数:15
相关论文
共 63 条
[1]   CORE LEVEL AND VALENCE BAND X-RAY PHOTOELECTRON-SPECTROSCOPY OF GOLD OXIDE [J].
AITA, CR ;
TRAN, NC .
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1991, 9 (03) :1498-1500
[2]  
ALLEN GC, 1974, J CHEM SOC DA, V14, P1525
[3]  
BAES CF, 1979, HYDROLYSIS CATIONS
[4]   HIGH-RESOLUTION MICROSCOPY OF GOLD IN UNOXIDIZED ORE FROM THE CARLIN MINE, NEVADA [J].
BAKKEN, BM ;
HOCHELLA, MF ;
MARSHALL, AF ;
TURNER, AM .
ECONOMIC GEOLOGY, 1989, 84 (01) :171-179
[5]  
BANCROFT GM, 1990, REV MINERAL, V23, P511
[6]   MERCURY REMOVAL FROM WATER BY IRON SULFIDE MINERALS - ELECTRON-SPECTROSCOPY FOR CHEMICAL-ANALYSIS (ESCA) STUDY [J].
BROWN, JR ;
BANCROFT, GM ;
FYFE, WS ;
MCLEAN, RAN .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1979, 13 (09) :1142-1144
[7]  
CABRI LJ, 1989, CAN MINERAL, V27, P353
[8]   RING-DISK STUDY OF EFFECT OF TRACE CHLORIDE-ION ON ANODIC BEHAVIOR OF GOLD IN O.2 M H2SO4 [J].
CADLE, SH ;
BRUCKENS.S .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1973, 48 (03) :325-331
[9]  
CHRYSSOULIS SL, 1990, T I MIN METALL C, V99, pC1
[10]  
Chu W.-K., 1978, BACKSCATTERING SPECT