Conditioning of carbonaceous material prior to physical beneficiation

Patent · Thu Jan 01 00:00:00 EST 1987

OSTI ID:866369

Warzinski, Robert P ^[1]; Ruether, John A ^[2]

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1. Venetia, PA
2. McMurray, PA

A carbonaceous material such as coal is conditioned by contact with a supercritical fluid prior to physical beneficiation. The solid feed material is contacted with an organic supercritical fluid such as cyclohexane or methanol at temperatures slightly above the critical temperature and pressures of 1 to 4 times the critical pressure. A minor solute fraction is extracted into critical phase and separated from the solid residuum. The residuum is then processed by physical separation such as by froth flotation or specific gravity separation to recover a substantial fraction thereof with reduced ash content. The solute in supercritical phase can be released by pressure reduction and recombined with the low-ash, carbonaceous material.

• Research Organization: USDOE Pittsburgh Energy Technology Center (PETC), PA (United States)
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4695372
• OSTI ID: 866369
• Country of Publication: United States
• Language: English

Related Subjects

conditioning
carbonaceous
material
prior
physical
beneficiation
coal
conditioned
contact
supercritical
fluid
solid
feed
contacted
organic
cyclohexane
methanol
temperatures
slightly
critical
temperature
pressures
times
pressure
minor
solute
fraction
extracted
phase
separated
residuum
processed
separation
froth
flotation
specific
gravity
recover
substantial
reduced
ash
content
released
reduction
recombined
low-ash
material prior
physical separation
pressure reduction
substantial fraction
specific gravity
feed material
critical temperature
supercritical fluid
carbonaceous material
ash content
froth flotation
reduced ash
critical pressure
solid feed
fluid prior
physical beneficiation
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