Physico-chemical fracturing and cleaning of coal. [Treatment with CO/sub 2/ in water at high pressure]

Patent · 30 September 1983

OSTI ID:7153587

Sapienza, R S; Slegeir, W A.R.

This invention relates to a method of producing a crushable coal and reducing the metallic values in coal represented by Si, Al, Ca, Na, K, and Mg, which comprises contacting a coal/water mix in a weight ratio of from about 4:1 to 1:6 in the presence of CO/sub 2/ at pressures of about 100 to 1400 psi and a minimum temperature of about 15/sup 0/C for a period of about one or more hours to produce a treated coal/water mix. In the process the treated coal/water mix has reduced values for Ca and Mg of up to 78% over the starting mix and the advantageous CO/sub 2/ concentration is in the range of about 3 to 30 g/L. Below 5 g/L CO/sub 2/ only small effects are observed and above 30 g/L no further special advantages are achieved. The coal/water ratios in the range 1:2 to 2:1 are particularly desirable and such ratios are compatible with coal water slurry applications.

• DOE Contract Number: AC02-76CH00016
• Assignee: Dept. of Energy
• Patent Number(s): None
• Application Number: ON: DE84011282
• OSTI ID: 7153587
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COAL PREPARATION
COMMINUTION
DEASHING
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUEL SLURRIES
FUELS
HYDROGEN COMPOUNDS
MAGNESIUM COMPOUNDS
MATERIALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
PRESSURE DEPENDENCE
QUANTITY RATIO
REMOVAL
SILICON COMPOUNDS
SLURRIES
SODIUM COMPOUNDS
SUSPENSIONS
TEMPERATURE DEPENDENCE
WATER