Calcination of calcium carbonate and blend therefor

Patent · Tue May 09 00:00:00 EDT 1989

OSTI ID:5756690

Mallow, W A; Dziuk, Jr, J J

This patent describes a method for the accelerated calcination of a calcium carbonate material. It comprises: heating the calcium carbonate material to a temperature and for a time sufficient to calcine the material to the degree desired while in the presence of a fused salt catalyst consisting of particles having a size above or below that of the calcium carbonate material; the catalyst comprising at least one fused salt having the formula M{sub 2}CO{sub 3}. CaCO{sub 3}-CaO-H{sub 2}O{sub {ital x}}, wherein M is an alkali metal selected from sodium or potassium and x is 0 to 1 and the salt is formed by fusing M{sub 2}CO{sub 3} and CaCO{sub 3} in a molar ratio of about 1:2 to 2:1 when the alkali metal is sodium and about 1:1 to 2:1 when the alkali metal is potassium. This patent also describes a blend adapted to be heated to form CaO. It comprises: a calcium carbonate material and a catalyst consisting of particles having a size above or below that of the calcium carbonate material; the catalyst comprising at least one fused salt having the formula M{sub 2}CO{sub 3}-CaCO{sub 3}CaO-H{sub 2}O{sub {ital x}}.

• Assignee: Southwest Research Institute, San Antonio, TX (USA)
• Patent Number(s): US 4828620; A
• Application Number: PPN: US 7-089830A
• OSTI ID: 5756690
• Resource Relation: Patent File Date: 27 Aug 1987
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM CARBONATES
CALCINATION
CATALYSTS
HEAT TREATMENTS
MIXING
POTASSIUM
SODIUM
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
METALS
OXYGEN COMPOUNDS
PYROLYSIS
THERMOCHEMICAL PROCESSES
400201* - Chemical & Physicochemical Properties