Coal cleaning and the removal of ash from coal

Patent · Tue Mar 11 00:00:00 EST 1986

OSTI ID:5789139

Robbins, L A

A method is described for treating a coal containing mass to reduce the ash components which comprises: (1) crushing the mass smaller than 20 mesh; (2) slurrying the crushed mass with water and an immiscible heavier-than-water organic media employing an intense mixing sufficient to cause intimate contact of the crushed mass with each liquid component of the slurry without an appreciable attrition; (3) carrying out a mild to substantially quiescent mixing sufficient to allow some initial disengagement of the water phase and its occluded ash from the organic media phase and its occluded coal; (4) separating the water phase from the heavier-than-water media phase including their respective solids in a raked settler; (5) collecting the separated phases and freeing the solids in each phase from its liquid; (6) drying the solids by contact with a heated surface.

• Assignee: Dow Chemical Co., Midland, MI
• Patent Number(s): US 4575418
• OSTI ID: 5789139
• Resource Relation: Patent File Date: Filed date 3 Oct 1984
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ASHES
REMOVAL
COAL
CLEANING
DEASHING
DESULFURIZATION
DRYING
COAL PREPARATION
CRUSHING
HEAVY MEDIA SEPARATION
MIXING
SLURRIES
WATER
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMMINUTION
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
MATERIALS
MIXTURES
OXYGEN COMPOUNDS
RESIDUES
SEPARATION PROCESSES
SUSPENSIONS
013000* - Coal
Lignite
& Peat- Transport
Handling
& Storage