Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions

Greer, R T; Markuszewski, R; Wheelock, T D

Title: Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions

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Abstract

Oxidation of pyrite alone and pyrite embedded in coal by leaching with hot solutions of sodium carbonate containing dissolved oxygen under pressure produces hematite, the major solid reaction product. The hematite is deposited as a concentric rim surrounding the core of unreacted pyrite. The thickness of the rim is greater for products obtained after longer leaching time or under conditions of higher oxygen partial pressure. The product is identified as hematite by X-ray diffraction analysis. Data from scanning electron microscopy, and energy-dispersive X-ray analysis show that under these conditions of desulfurization, phase transformations occur (from pyrite to hematite). In addition, great differences in porosity of the two zones (core and rim) are observed. The nature and extent of these transformations are discussed in terms of the desulfurization potential of pyrite in coal. (10 refs.)

Authors:: Greer, R T; Markuszewski, R; Wheelock, T D

Publication Date:: Tue Jan 01 00:00:00 EST 1980

OSTI Identifier:: 5144492

Resource Type:: Journal Article

Journal Name:: Scanning Electron Microsc.; (United States)

Additional Journal Information:: Journal Volume: 1980:I

Country of Publication:: United States

Language:: English

Subject:: 01 COAL, LIGNITE, AND PEAT; COAL; DESULFURIZATION; PYRITE; OXIDATION; AUTOCLAVES; CHEMICAL REACTIONS; HEMATITE; LEACHING; MICROSCOPY; MICROSTRUCTURE; PHASE TRANSFORMATIONS; SCANNING ELECTRON MICROSCOPY; SODIUM CARBONATES; STRUCTURAL CHEMICAL ANALYSIS; VISIBLE RADIATION; X-RAY DIFFRACTION; ALKALI METAL COMPOUNDS; CARBON COMPOUNDS; CARBONACEOUS MATERIALS; CARBONATES; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL STRUCTURE; DIFFRACTION; DISSOLUTION; ELECTROMAGNETIC RADIATION; ELECTRON MICROSCOPY; ENERGY SOURCES; FOSSIL FUELS; FUELS; IRON COMPOUNDS; IRON ORES; IRON OXIDES; IRON SULFIDES; MATERIALS; MINERALS; ORES; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; SCATTERING; SEPARATION PROCESSES; SODIUM COMPOUNDS; SULFIDE MINERALS; SULFIDES; SULFUR COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 010600* - Coal, Lignite, & Peat- Properties & Composition; 010402 - Coal, Lignite, & Peat- Purification & Upgrading

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                    Greer, R T, Markuszewski, R, and Wheelock, T D. Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions.  United States: N. p., 1980. 
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                    Greer, R T, Markuszewski, R, & Wheelock, T D. Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions.  United States.

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                    Greer, R T, Markuszewski, R, and Wheelock, T D. 1980.  
        "Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions".  United States.

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@article{osti_5144492,

  title        = {Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions},

  author       = {Greer, R T and Markuszewski, R and Wheelock, T D},

  abstractNote = {Oxidation of pyrite alone and pyrite embedded in coal by leaching with hot solutions of sodium carbonate containing dissolved oxygen under pressure produces hematite, the major solid reaction product. The hematite is deposited as a concentric rim surrounding the core of unreacted pyrite. The thickness of the rim is greater for products obtained after longer leaching time or under conditions of higher oxygen partial pressure. The product is identified as hematite by X-ray diffraction analysis. Data from scanning electron microscopy, and energy-dispersive X-ray analysis show that under these conditions of desulfurization, phase transformations occur (from pyrite to hematite). In addition, great differences in porosity of the two zones (core and rim) are observed. The nature and extent of these transformations are discussed in terms of the desulfurization potential of pyrite in coal. (10 refs.)},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5144492},
  journal      = {Scanning Electron Microsc.; (United States)},
number       = ,

  volume       = 1980:I,

  place        = {United States},

  year         = {Tue Jan 01 00:00:00 EST 1980},

  month        = {Tue Jan 01 00:00:00 EST 1980}

}

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