Nonaqueous coal cleaning process

Patent · Tue Sep 22 04:00:00 EDT 1987

OSTI ID:5923850

Starbuck, A E

This patent describes a method of cyclone cleaning of fine particle coal containing carbonaceous material, ash and pyrites comprising the steps of: a. demoisturizing the coal by immersing the coal in a non-aqueous drying liquid having a vaporization temperature higher than that of water. The drying liquid is maintained at a temperature exceeding the vaporization temperature of water, whereby water in the coal is vaporized from the coal and drying liquid; b. transferring the coal to a non-aqueous, agglomerate inhibiting, carrier liquid miscible with the drying liquid. The carrier liquid is comprised of a liquid mixture of a first liquid having a first specific gravity and a second liquid having a second specific gravity different from the first specific gravity. The carrier liquid's specific gravity is adjusted by using a select amount of each of the first and second liquids to yield a carrier liquid specific gravity intermediate the first and second specific gravities. The carrier liquid specific gravity is greater than 1 less than 1.6 selected for effective separation of carbonaceous material from pyrites and ash for a particular coal and wherein the carrier liquid has the characteristic of extracting non-pyrite forms of sulfur from the coal; and c. cycloning the coal in the carrier liquid with a compound cyclone, wherein a first stream predominantly consisting of carbonaceous material and liquid is separated from a second stream predominantly consisting of ash, pyrites and liquid.

• Assignee: NOV; NOV-87-083366; EDB-88-000015
• Patent Number(s): US 4695371
• OSTI ID: 5923850
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
ASHES
CHALCOGENIDES
CHEMICAL REACTIONS
CLEANING
COAL FINES
COAL PREPARATION
DEASHING
DEHYDRATION
DENSITY
DESULFURIZATION
DISPERSIONS
DRYING
EVAPORATION
IRON COMPOUNDS
IRON SULFIDES
MINERALS
MIXTURES
MOISTURE
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PROCESS SOLUTIONS
PYRITE
REMOVAL
RESIDUES
SOLUTIONS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS