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Title: A method for preparation and cleaning of uniformly sized arsenopyrite particles

Abstract

The oxidative dissolution of sulfide minerals, such as arsenopyrite (FeAsS), is of critical importance in many geochemical systems. A comprehensive understanding of their dissolution rates entails careful preparation of the mineral surface. Measurements of dissolution rates of arsenic from arsenopyrite are dependent on the size and degree of oxidation of its particles, among other factors. In this work, a method was developed for preparation and cleaning of arsenopyrite particles with size range of 150–250 μm. Four different cleaning methods were evaluated for effectiveness based on the removal of oxidized species of iron (Fe), arsenic (As) and sulfur (S) from the surface. The percentage oxidation of the surface was determined using X-ray photoelectron spectroscopy (XPS), and surface stoichiometry was measured using scanning electron microscopy – energy dispersive X-ray spectroscopy (SEM-EDS). Results indicate that sonicating the arsenopyrite particles and then cleaning them with 12N HCl followed by 50% ethanol, and drying in nitrogen was the most effective method. This method was successful in greatly reducing the oxide species of Fe while completely removing oxides of As and S from the arsenopyrite surface. Although sonication and acid cleaning have been widely used for mineral preparation, the method described in this study can significantlymore » reduce grain size heterogeneity as well as surface oxidation, which enables greater control in surface and dissolution experiments.« less

Authors:
 [1];  [2];  [1];  [1]
+ Show Author Affiliations
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1168806
Report Number(s):
UNIV-PUB-265
Journal ID: ISSN 1467-4866
Grant/Contract Number:  
FE0004000
Resource Type:
Accepted Manuscript
Journal Name:
Geochemical Transactions
Additional Journal Information:
Journal Volume: 15; Journal Issue: 1; Journal ID: ISSN 1467-4866
Publisher:
American Chemical Society, Geochemistry Div.
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; X-RAY PHOTOELECTRON SPECTROSCOPY; SURFACE CLEANING; OXIDATION; Arsenopyrite; XPS; Mineral preparation; Surface cleaning; Oxidation

Citation Formats

Parthasarathy, Hariprasad, Baltrus, John P, Dzombak, David A, and Karamalidis, Athanasios K. A method for preparation and cleaning of uniformly sized arsenopyrite particles. United States: N. p., 2014. Web. doi:10.1186/s12932-014-0014-9.
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Parthasarathy, Hariprasad, Baltrus, John P, Dzombak, David A, & Karamalidis, Athanasios K. A method for preparation and cleaning of uniformly sized arsenopyrite particles. United States. https://doi.org/10.1186/s12932-014-0014-9
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Parthasarathy, Hariprasad, Baltrus, John P, Dzombak, David A, and Karamalidis, Athanasios K. Sat . "A method for preparation and cleaning of uniformly sized arsenopyrite particles". United States. https://doi.org/10.1186/s12932-014-0014-9. https://www.osti.gov/servlets/purl/1168806.
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@article{osti_1168806,
title = {A method for preparation and cleaning of uniformly sized arsenopyrite particles},
author = {Parthasarathy, Hariprasad and Baltrus, John P and Dzombak, David A and Karamalidis, Athanasios K},
abstractNote = {The oxidative dissolution of sulfide minerals, such as arsenopyrite (FeAsS), is of critical importance in many geochemical systems. A comprehensive understanding of their dissolution rates entails careful preparation of the mineral surface. Measurements of dissolution rates of arsenic from arsenopyrite are dependent on the size and degree of oxidation of its particles, among other factors. In this work, a method was developed for preparation and cleaning of arsenopyrite particles with size range of 150–250 μm. Four different cleaning methods were evaluated for effectiveness based on the removal of oxidized species of iron (Fe), arsenic (As) and sulfur (S) from the surface. The percentage oxidation of the surface was determined using X-ray photoelectron spectroscopy (XPS), and surface stoichiometry was measured using scanning electron microscopy – energy dispersive X-ray spectroscopy (SEM-EDS). Results indicate that sonicating the arsenopyrite particles and then cleaning them with 12N HCl followed by 50% ethanol, and drying in nitrogen was the most effective method. This method was successful in greatly reducing the oxide species of Fe while completely removing oxides of As and S from the arsenopyrite surface. Although sonication and acid cleaning have been widely used for mineral preparation, the method described in this study can significantly reduce grain size heterogeneity as well as surface oxidation, which enables greater control in surface and dissolution experiments.},
doi = {10.1186/s12932-014-0014-9},
journal = {Geochemical Transactions},
number = 1,
volume = 15,
place = {United States},
year = {Sat Oct 11 00:00:00 EDT 2014},
month = {Sat Oct 11 00:00:00 EDT 2014}
}
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Publisher's Version of Record
https://doi.org/10.1186/s12932-014-0014-9
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Works referenced in this record:

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Aqueous pyrite oxidation by dissolved oxygen and by ferric iron
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Oxidation of arsenopyrite by air and air-saturated, distilled water, and implications for mechanism of oxidation
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Characterization of a natural and an electro-oxidized arsenopyrite: a study on electrochemical and X-ray photoelectron spectroscopy
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The surface oxidation of pyrite
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Reactivity of surface sites on fractured arsenopyrite (FeAsS) toward oxygen
journal, November 2000

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Extractability of Metal Sulfide Minerals in Acidic Solutions:  Application to Environmental Studies of Trace Metal Contamination within Anoxic Sediments
journal, February 1998

  • Cooper, D. Craig; Morse, John W.
  • Environmental Science & Technology, Vol. 32, Issue 8
  • DOI: 10.1021/es970415t
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