The invention relates to the field of preparation of
refractory materials, particularly a method for preparing high-quality
calcium magnesia by superhigh-temperature
calcination, which is characterized by comprising the following steps: preparing
dolomite and
magnesite into a
raw material in which the CaO content is 15-20 wt% and the MgO content is 80-85%; adding the
raw material into a ball milling tank,
grinding and mixing, and meanwhile, adding water to carry out slaking and slurrying; and
drying the
slurry, adding
calcium lignosulphonate, evenly mixing, pressing into green bricks, and calcining. The
calcination process comprises the following steps: heating to 1100 DEG C, keeping the temperature for 3-5 hours, heating to the final
calcination temperature of 2000-2200 DEG C, keeping the temperature for 5-7 hours, vacuumizing, cooling with water to 1000 DEG C, introducing protective
hydrogen, and continuing cooling with water to
room temperature. Compared with the prior art, the
calcium magnesia has the advantages of high hydration resistance and high
corrosion resistance, thereby basically solving the problem of high hydration tendency in the
magnesium-calcium
refractory material, and facilitating the storage, transportation, building and the like in future.