Removal of pyritic sulfur from coal using solutions containing ferric ions. [Removal of at least 60 percent of pyrite S]

Patent · Tue Nov 04 04:00:00 EST 1975

OSTI ID:7297121

Meyers, R A

Finely divided coal or solid coal derivatives containing pyrite are reacted with a ferric ion solution; FeCl/sub 3/ is particularly suitable. The ferric ion is reduced to ferrous ion and free sulfur is formed. The solution is then filtered from the coal which is then washed and heat dried under low pressure. Most of the free sulfur is volatilized from the coal due to the heat drying; additional free sulfur can be removed by additional washing and heat drying and/or solvent extraction techniques. At least 60 percent of the pyrite sulfur and pyrite iron is removed using the process of this invention. If desired, the ferrous chloride can be regenerated; this permits iron oxide to be recovered as a byproduct. (auth)

• Assignee: TRW Inc.
• Patent Number(s): US 3917465
• OSTI ID: 7297121
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
010500 -- Coal
Lignite
& Peat-- Products & By-Products
AQUEOUS SOLUTIONS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CLEANING
COAL
DESULFURIZATION
DIAGRAMS
DISPERSIONS
DRYING
ELEMENTS
ENERGY SOURCES
EXTRACTION
FILTRATION
FLOWSHEETS
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
IRON CHLORIDES
IRON COMPOUNDS
IRON SULFIDES
MINERALS
MIXTURES
NONMETALS
ORES
PYRITE
PYRITES
RECOVERY
REMOVAL
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SULFIDES
SULFUR
SULFUR COMPOUNDS
SULFUR ORES
TRANSITION ELEMENT COMPOUNDS
WASHING