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US 6,200,381 B1Granted
Settable composition and uses therefor
AssigneePericlase Pty. Ltd.
InventorDino Rechichi
Life of this patent
Estimating the term…
Abstract
A dry powdered flowable cement composition contains calcium carbonate and a partially decarbonated magnesium carbonate. A slurry of the composition will set hard with various organic fillers including waste products and toxic waste. The composition can be slurried with contaminated water such as sea water, mineral laden ground water and muddy water. A high percentage of filler can be added while still having an acceptable set.
Claims20
A settable binder composition, consisting essentially of a mixture of a calcium carbonate and a caustic magnesium oxide, the mixture selected from the group consisting of:
- (a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500° C. to 800° C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate, and calcium carbonate (MgO, MgCO3, and CaCO3);
- and,
- (b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500° C. to 800° C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3).
A settable binder composition, the composition consisting essentially of a mixture of a calcium carbonate and a caustic magnesium oxide, the mixture selected from the group consisting of
- (a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500° C. to 800° C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and,
- (b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500° C. to 800° C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3), and, wherein 0.1%-15% of a suitable inorganic salt is added to enhance the preferential decarbonization of the magnesium carbonate.
A settable binder composition, the composition consisting essentially of a mixture of a calcium carbonate and a caustic magnesium oxide, the mixture selected from the group consisting of:
- (a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500° C. to 800° C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and,
- (b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500° C. to 800° C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and, further including a sulfate additive present between 0.01% up to 10%.
1 more element
A settable binder composition, the composition consisting essentially of a mixture of a calcium carbonate and a caustic magnesium oxide, the mixture selected from the group consisting of:
- (a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500° C. to 800° C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and,
- (b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500° C. to 800° C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and, further including a carbonate additive which produces a source of carbonation during the setting process.
1 more element
A settable binder composition, the composition consisting essentially of a mixture of a calcium carbonate and a caustic magnesium oxide, the mixture selected from the group consisting of:
- (a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500° C. to 800° C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and,
- (b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500° C. to 800° C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and, further including the following additives:
- (i) aluminum sulfate and (ii) a carboxylic acid, the additives comprising about 3% to about 15% of the composition.
2 more elements
A settable binder composition, the composition consisting essentially of a mixture of a calcium carbonate and a caustic magnesium oxide, the mixture selected from the group consisting of:
- (a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500° C. to 800° C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and,
- (b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500° C. to 800° C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and further including the following additives:
- (i) aluminum sulfate, (ii) a carboxylic acid and (iii) a salt, wherein (i) is present between 40%-80%;
- (ii) is present between 10%-60% and (iii) is present between 1%-20% of the additives, the additives comprising about 3% to about 15% of the composition.
3 more elements
A settable binder composition, the composition consisting essentially of a mixture of a calcium carbonate and a caustic magnesium oxide, the mixture selected from the group consisting of:
- (a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500° C. to 800° C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and,
- (b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500° C. to 800° C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO3 and CaCO3);
- and further including a sulfate additive present between 0.01% up to 10% and at least one filler.
1 more element
Dependencies are inferred from the claim text.