What are the three processes for the preparation of activated magnesia?
With the development of science and technology and national economy, the use of active magnesium
oxide is more and more widely, demand continues to increase. Therefore, the preparation process
of activated magnesia has also been more people's attention, today to tell you about the active
magnesium oxide three preparation process.
1, dolomite carbonization method. The dolomite or magnesite is calcined and digested with water
to obtain Mg (OH) 2 and Ca (OH) 2. After carbonization with CO2, magnesium bicarbonate and
by-product calcium carbonate are obtained. Removal of calcium carbonate after the mother liquor,
and then by pyrolysis, to be basic magnesium carbonate, and then calcined at 800 ℃ for 1 to
2 hours, can be made active magnesium oxide.
2, brine - ammonia. After the introduction of ammonia gas, the brine in the brine to produce
magnesium hydroxide deposition, magnesium hydroxide by filtration, washing, destruction,
drying, transferred to a rotary calciner calcined to produce activated magnesium oxide.
The temperature at the time of calcination is preferably controlled at 500 ° C for 2 hours.
3, brine - ammonium carbonate method. Adding the ammonium carbonate solution to the brine,
heating and sizing to form the basic magnesium carbonate deposition, and depositing the
activated magnesium oxide by filtering, washing, drying, destroying and calcining.
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