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Title: Controlling incipient oxidation of pyrite for improved rejection. Final report

Abstract

It is well known that superficial oxidation of pyrite produces a hydrophobic sulfur-rich surface and creates problems in separating the mineral from coal using surface-based processes such as flotation and agglomeration. Numerous studies of pyrite oxidation have been conducted but most of them were concerned with the advanced stages of oxidation, and as a result it was not possible to establish a relationship between oxidation and flotation behavior. A better understanding of the mechanisms and kinetics of the incipient oxidation reactions, which may vary with the origin, morphology, texture, and solid state properties of pyrite, can lead to the development of new processes that can improve pyrite rejection from coal. This project is aimed at better understanding of the mechanisms involved during the initial stages of pyrite oxidation to foster the development of advanced coal cleaning technologies. Studies were conducted by fracturing pyrite electrodes in-situ in an electrochemical cell to create virgin surfaces. Electrochemical and photoelectrochemical techniques were employed to characterize the incipient oxidation of pyrite in aqueous solutions. Microflotation tests were conducted to obtain information on the hydrophobicity of pyrite under controlled E{sub h} and pH conditions, and the results were correlated with electrochemical studies.

Authors:
; ;
Publication Date:
Research Org.:
Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Mining and Minerals Engineering
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
245585
Report Number(s):
DOE/PC/92547-T9
ON: DE96011540; TRN: 96:003665
DOE Contract Number:  
FG22-92PC92547
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 40 CHEMISTRY; PYRITE; OXIDATION; AQUEOUS SOLUTIONS; COAL; ELECTRODES; FLOTATION; MORPHOLOGY; TEXTURE; COAL PREPARATION; DESULFURIZATION; SURFACE PROPERTIES

Citation Formats

Yoon, R H, Richardson, P E, and Tao, D P. Controlling incipient oxidation of pyrite for improved rejection. Final report. United States: N. p., 1996. Web. doi:10.2172/245585.
Yoon, R H, Richardson, P E, & Tao, D P. Controlling incipient oxidation of pyrite for improved rejection. Final report. United States. https://doi.org/10.2172/245585
Yoon, R H, Richardson, P E, and Tao, D P. Mon . "Controlling incipient oxidation of pyrite for improved rejection. Final report". United States. https://doi.org/10.2172/245585. https://www.osti.gov/servlets/purl/245585.
@article{osti_245585,
title = {Controlling incipient oxidation of pyrite for improved rejection. Final report},
author = {Yoon, R H and Richardson, P E and Tao, D P},
abstractNote = {It is well known that superficial oxidation of pyrite produces a hydrophobic sulfur-rich surface and creates problems in separating the mineral from coal using surface-based processes such as flotation and agglomeration. Numerous studies of pyrite oxidation have been conducted but most of them were concerned with the advanced stages of oxidation, and as a result it was not possible to establish a relationship between oxidation and flotation behavior. A better understanding of the mechanisms and kinetics of the incipient oxidation reactions, which may vary with the origin, morphology, texture, and solid state properties of pyrite, can lead to the development of new processes that can improve pyrite rejection from coal. This project is aimed at better understanding of the mechanisms involved during the initial stages of pyrite oxidation to foster the development of advanced coal cleaning technologies. Studies were conducted by fracturing pyrite electrodes in-situ in an electrochemical cell to create virgin surfaces. Electrochemical and photoelectrochemical techniques were employed to characterize the incipient oxidation of pyrite in aqueous solutions. Microflotation tests were conducted to obtain information on the hydrophobicity of pyrite under controlled E{sub h} and pH conditions, and the results were correlated with electrochemical studies.},
doi = {10.2172/245585},
url = {https://www.osti.gov/biblio/245585}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {4}
}