Nonaqueous coal cleaning process
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
- Resource Relation:
- Patent File Date: Filed date 26 Jul 1984
- Country of Publication:
- United States
- Language:
- English
Similar Records
Method of reclaiming water and coal from coal treatment underflow by two-stage separation of solids
Method of reclaiming water and coal from coal treatment underflow by two-stage separation of solids
Related Subjects
ASHES
REMOVAL
COAL FINES
DEASHING
DEHYDRATION
DESULFURIZATION
PYRITE
CLEANING
COAL PREPARATION
DENSITY
DRYING
EVAPORATION
MOISTURE
PROCESS SOLUTIONS
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
IRON COMPOUNDS
IRON SULFIDES
MINERALS
MIXTURES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RESIDUES
SOLUTIONS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
010402* - Coal
Lignite
& Peat- Purification & Upgrading