Chemical leaching of coal to remove ash, alkali and vanadium

Patent · Tue Apr 15 00:00:00 EST 1986

OSTI ID:5789063

Smit, F J; Huggins, D K; Berggren, M; Anast, K R

A process is described for upgrading powdered coal to improve the usefulness thereof as a fuel for internal combustion engines which consists of: (a) pressure-leaching powdered coal having a particle size ranging from about 28 mesh to about 200 mesh in an aqueous caustic solution at a temperature ranging from about 175/sup 0/C, to about 350/sup 0/C., the amount of caustic in the solution ranging from about 5% to about 30% by weight, the amount of coal being sufficient to form a slurry comprising about 10% to 30% by weight of solids, (b) hydrochloric acid leaching the caustic leached coal to dissolve acid-soluble constituents resulting from the caustic leach, (c) pressure leaching the acid-leached coal with a liquid from the group consisting of water and dilute aqueous ammonia to remove sodium and chlorine, and thereafter (d) filtering and washing the pressure leached coal, whereby the coal is characterized by up to about 0.85% by weight of ash, up to about 150 ppm of alkali metals and up to about 4 ppm vanadium.

• Assignee: AMAX Inc., Greenwich, CT
• Patent Number(s): US 4582512
• OSTI ID: 5789063
• Resource Relation: Patent File Date: Filed date 20 Jun 1984
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
33 ADVANCED PROPULSION SYSTEMS
COAL FINES
DEASHING
DEMETALLIZATION
LEACHING
INTERNAL COMBUSTION ENGINES
FUEL SUBSTITUTION
AMMONIA
AQUEOUS SOLUTIONS
CHLORINE
DISSOLUTION
FILTRATION
FUEL SLURRIES
HIGH TEMPERATURE
HYDROCHLORIC ACID
PARTICLE SIZE
POTASSIUM
PRESSURE DEPENDENCE
SODIUM
WASHING
WATER
ALKALI METALS
CLEANING
DISPERSIONS
ELEMENTS
ENGINES
FUELS
HALOGENS
HEAT ENGINES
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MIXTURES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SIZE
SLURRIES
SOLUTIONS
SUSPENSIONS
010407* - Coal & Coal Products- Solvent Extraction- (-1987)
010402 - Coal
Lignite
& Peat- Purification & Upgrading
330100 - Internal Combustion Engines
330800 - Emission Control- Alternative Fuels