Process for producing deep cleaned coal
This patent describes a physio-chemical process for producing deep cleaned coal, comprising the steps of: providing a supply of air-dried coal of particle size fractions of no greater than 1/4 inchx0 mesh; immersing the coal in an organic solvent selected from the group consisting of butylamine, propylamine, and ethylene diamine, to form a mixture, having coal in an amount to provide no greater than 40 weight percent solids content, for a time period sufficient to swell the coal and to induce natural fracturing of the coal; processing the mixture to recover the organic solvent; subjecting the swelled coal to grinding to a particle size range of minus 28 mesh or finer; subjecting the swelled coal to leaching with a 10 to 20% aqueous hydrogen peroxide solution containing 1 to 2% sulfuric acid at ambient conditions to remove residual pyrite from the coal; and subjecting the swelled coal to leaching with an aqueous solution containing 3 to 6% ammonium hydrogen fluoride and 2 to 3% of nitric acid or hydrochloric acid to remove residual ash from the coal.
- Assignee:
- Babcock and Wilcox Co., New Orleans, LA
- Patent Number(s):
- US 4787918
- OSTI ID:
- 6487499
- Country of Publication:
- United States
- Language:
- English
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ACIDIFICATION
AMMONIUM COMPOUNDS
AMMONIUM FLUORIDES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CLEANING
COAL
COAL FINES
COAL PREPARATION
COMMINUTION
DEMINERALIZATION
DESULFURIZATION
DISSOLUTION
DRYING
ENERGY SOURCES
FLUORIDES
FLUORINE COMPOUNDS
FOSSIL FUELS
FRACTURING
FUELS
GRINDING
HALIDES
HALOGEN COMPOUNDS
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INORGANIC ACIDS
LEACHING
MACHINING
MATERIALS
NITRIC ACID
ORGANIC SOLVENTS
OXYGEN COMPOUNDS
PARTICLE SIZE
PEROXIDES
PRODUCTION
SEPARATION PROCESSES
SIZE
SOLVENTS
SULFURIC ACID
SWELLING