Calcination of calcium carbonate and blend therefor
AssigneeSouthwest Research Institute
InventorsWilliam A. Mallow, Jerome J. Dziuk, Jr.
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Abstract
A method for calcination of a calcium carbonate material comprising 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 catalyst; said catalyst comprising at least one fused salt having the formula MCO.sub.3.CaCO.sub.3.CaO.H.sub.2 O.sub.x, wherein M is an alkali metal and x is 0 to 1 and formed by fusing MCO.sub.3 and CaCO.sub.3 in a molar ratio of about 1:2 to 2:1, and a blend adapted to be heated to CaO comprising a calcium carbonate material and at least one such fused salt.
Claims11
A method for the accelerated calcination of a calcium carbonate material comprising heating the calcium carbonate material to a temperature and for a time sufficient to calcine said 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 said calcium carbonate material;
- said catalyst comprising at least one fused salt having the formula M.sub.2 CO.sub.3 .multidot.CaCO.sub.3 .multidot.CaO.multidot.H.sub.2 O.sub.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.
A method of making a cement comprising calcining a calcium carbonate material in the presence of a catalyst consisting of particles of a size above or below that of said calcium carbonate material;
- said catalyst having the formula M.sub.2 CO.sub.3 .multidot.CaCO.sub.3 .multidot.CaO.multidot.H.sub.2 O.sub.x, wherein M is an alkali metal selected from sodium or potassium and x is 0 or 1 and the salt is formed by fusing MCO.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 and said catalyst is used in the ratio of about 1 to 10 parts by weight for each 100 parts by weight of the calcium carbonate material with the resulting calcined product, calcium oxide, comprising a cement.
A blend adapted to be heated to form CaO comprising a calcium carbonate material and a catalyst consisting of particles having a size above or below that of said calcium carbonate material;
- said catalyst comprising at least one fused salt having the formula M.sub.2 CO.sub.3 .multidot.CaCO.sub.3 .multidot.CaO.multidot.H.sub.2 O.sub.x, wherein M is an alkali metal selected from sodium or potassium and x is 0 or 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 1:1 to 2:1 when the alkali metal is potassium.
Dependencies are inferred from the claim text.