Controlling incipient oxidation of pyrite for improved rejection. Final report

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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 ... continued below

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90 p.

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Yoon, R.H.; Richardson, P.E. & Tao, D.P. April 1, 1996.

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Description

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.

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90 p.

Notes

OSTI as DE96011540

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  • Other Information: PBD: Apr 1996

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  • Other: DE96011540
  • Report No.: DOE/PC/92547--T9
  • Grant Number: FG22-92PC92547
  • DOI: 10.2172/245585 | External Link
  • Office of Scientific & Technical Information Report Number: 245585
  • Archival Resource Key: ark:/67531/metadc667560

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • April 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Nov. 19, 2015, 6:34 p.m.

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Yoon, R.H.; Richardson, P.E. & Tao, D.P. Controlling incipient oxidation of pyrite for improved rejection. Final report, report, April 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc667560/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.