Process for removing mineral matter from coal

Patent · Tue Sep 23 04:00:00 EDT 1986

OSTI ID:5097995

Chiang, S H; Klinzing, G E

A process is described for removing mineral matter from a process water slurry of pulverized feed coal comprising coal and coal minerals. The process consists of establishing a contacting zone at temperature and pressure such that carbon dioxide and the coal-process water slurry exist as a two phase liquid-liquid mixture, contacting the coal-process water slurry with liquid carbon dioxide in the contacting zone. This allows the liquid carbon dioxide to preferentially coat the pulverized feed coal, the temperature and pressure in the contacting zone further being such that carbon dioxide microbubbles form on the pulverized feed coal during the contacting step, separating a demineralized coal and a liquid carbon dioxide phase from the contacted mixture as a relatively light fraction and a concentrated coal minerals and process water phase as a relatively heavy fraction, removing the relatively light fraction from the contacting zone and separately removing the relatively heavy fraction from the contacting zone.

• Assignee: Univ. of Pittsburgh, Pittsburgh, PA
• Patent Number(s): US 4613429
• OSTI ID: 5097995
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
ADSORPTION
BUBBLES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COAL FINES
COAL PREPARATION
DISPERSIONS
FLOTATION
FLUIDS
FUEL SLURRIES
FUELS
HYDROGEN COMPOUNDS
LICADO PROCESS
LIQUEFIED GASES
LIQUIDS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
SEPARATION PROCESSES
SLURRIES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SUSPENSIONS
TEMPERATURE DEPENDENCE
WATER