Magnesium oxide is an oxide of magnesium, an ionic compound, a white solid at room temperature. Magnesium oxide exists in nature in the form of periclase and is the raw material for magnesium smelting. With the development of science and technology and the national economy, the use of activated magnesium oxide is becoming more and more extensive, and the demand continues to increase. Therefore, the preparation process of activated magnesium oxide has also received more attention.
The processes for producing activated magnesium oxide by brine method mainly include the following:
Brine-ammonia method:
The magnesium salt in the brine is converted into magnesium hydroxide precipitation.
After filtering, washing and drying, the magnesium hydroxide is transferred to a rotary calcining furnace for calcination to obtain activated magnesium oxide.
The temperature during calcination is preferably controlled at 500°C for 2 hours.
Brine-ammonium carbonate method:
Add ammonium carbonate aqueous solution to brine, and generate basic magnesium carbonate precipitation by heating and precipitation.
The precipitation is filtered, washed, dried, destroyed, calcined and differentiated to obtain activated magnesium oxide.
Brine-soda method:
Refined MgCl solution and refined soda solution react at about 55 degrees Celsius to produce Mg(CO)3.
Then it is precipitated, dehydrated, rinsed, dried, and finally calcined at 700-900 degrees Celsius to produce active magnesium oxide.
Brine-ammonium bicarbonate method:
Refined magnesium chloride solution reacts with refined ammonium carbonate solution to produce Mg(CO)3.
Active MgO can be produced through dehydration, drying, calcination and other processes.
Brine-ammonium method:
Refined magnesium chloride solution reacts with ammonia water (or continuously with gaseous ammonia) to produce Mg(OH)2 precipitate.
MgO products are produced through separation, washing, drying and calcination.
Each of these methods has its own advantages and disadvantages. The selection of the appropriate method requires comprehensive consideration based on specific needs and conditions, such as raw material sources, costs, energy consumption, product purity and other factors.