Process for converting coal ash slag into portland cement

Patent · Tue Nov 20 04:00:00 EST 1979

OSTI ID:5699374

Fondriest, F F

Disclosed is a manufacturing process for converting coal ash slag from a slagging coal gasifier into a marketable cement product having the characteristics and qualities of portland cement. This process comprises the steps of transferring molten slag from a slagging coal gasifier to a melt chamber and reacting it with a mineral containing lime, for example: calcium oxide, calcium hydroxide or calcium carbonate, to form a homogeneous cement product. This cement product is then transferred to a quench chamber where it is allowed to cool and solidify in the form of clinkers, which are later reduced to powder form. This process also provides an efficient means to conserve energy when producing a portland cement and provides an effective and economical way to dispose of a waste product while increasing the cost efficiency of a slagging coal gasifier.

• Assignee: Standard Oil Co. (Indiana)
• Patent Number(s): US 4174974
• OSTI ID: 5699374
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
ALKALINE EARTH METAL COMPOUNDS
ASHES
BUILDING MATERIALS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CEMENTS
CHALCOGENIDES
COAL
COAL GASIFICATION PLANTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROXIDES
INDUSTRIAL PLANTS
MANUFACTURING
MATERIALS
OXIDES
OXYGEN COMPOUNDS
RESIDUES
SLAGS
WASTE PRODUCT UTILIZATION