Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions
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.)
- OSTI ID:
- 5144492
- Journal Information:
- Scanning Electron Microsc.; (United States), Vol. 1980:I
- Country of Publication:
- United States
- Language:
- English
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Pyrite desulfurization by wet oxidation in alkaline solutions
Related Subjects
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