Patent ID: 6200381
Filing Date: 2001-03-13
Classification: C04B,Y02W

Abstract:
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.degree. C. to 800.degree. 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, MgCO.sub.3, and CaCO.sub.3); 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.degree. C. to 800.degree. 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, MgCO.sub.3 and CaCO.sub.3).