The large amount of microporosity in calcium hexaluminate insulating refractory keeps its thermal conductivity at low levels from room temperature to 1 500 ℃,which makes calcium hexaluminate insulating refractory as a unique novel insulating material.

Calcium hexaluminate (CA 6) was synthesized by reaction sintering of two kinds of mixtures of CaCO 3/α-Al 2O 3 and pure calcium aluminate cement/α-Al 2O 3,respectively.

Calcium dialuminate (CA2) and Calcium hexaluminate (CA6) occur at CaO-Al2O3 system as important compounds.

The nanometer hexagonal calcium aluminate hydrate(C4AHx) particles were prepared by liquid phase sedimentation.

Synthesis condition and method of hexagonal calcium aluminate hydrate are described.

Formation kinetics of high-temperature phase sulphoaluminate;

Study of sulfur-fixing characteristics of sulphoaluminate in different atmosphere at high temperature;

Study of high temperature phase of sulphoaluminate for desulfuration;

The study of the effect of calcium in calcium aluminate ore Powder on the product property of aluminum - calcium saltcoagulants;

Study on the preparation of PAC coagulant from bauxite and calcium aluminate;

Study on properties of Portland cement modified with calcium sulphoaluminate;

Testing methods such as chemical analysis, X-ray diffraction and differential scanning calorimetry were used to study the influence of Fe2O3 on the formation of anhydrous calcium sulphoaluminate ( C 4 A 3S ).

The kinds,shapes and quantities of hydration products and the ion concentration in pore solution were investigated during hydration of fly ash or slag portland cement containing calcium sulphoaluminate by differential scanning calorimetry-thermogravimetry analysis,scanning electron microscope and chemical analysis.