Unveiling the Preparation Method of Magnesium Oxide

There are various methods for preparing magnesium oxide,mainly including the following

There are various methods for preparing magnesium oxide,mainly including the following:

Calcination method:Magnesite,dolomite and other ores are calcined at 950℃to 1500-2000℃to dehydrate magnesium hydroxide and produce magnesium oxide.This is one of the traditional methods for producing magnesium oxide,suitable for areas with abundant mineral resources.

Carbonization method:Extracting magnesium oxide from solid minerals such as dolomite and magnesite through steps such as calcination,digestion,and carbonization.This method has a lower cost,but the purity of the product may be relatively low.

Ammonia method:Using liquid ammonia or ammonia as a precipitant,it reacts with magnesium chloride in brine to produce magnesium hydroxide intermediate,which is then washed,filtered,and calcined to obtain high-purity magnesium oxide.This method has a high magnesium precipitation efficiency,and the by-product ammonium chloride can be used as a fertilizer raw material,with good environmental performance.

Direct pyrolysis method of brucite:Water containing magnesium chloride is heated directly in air or hot air flow,gradually losing its crystalline water and decomposing into magnesium oxide.This method has a simple process flow and low cost,but the recovery rate is low,and the hydrogen chloride tail gas is corrosive to the equipment.

Brine spray thermal decomposition method:concentrate the brine and spray it directly into the thermal decomposition reaction furnace.The crude MgO is produced by thermal decomposition at high temperature,and then washed and calcined to obtain high-purity MgO.This method requires a higher calcination temperature and has a higher production cost.

Primary cell method:This is an emerging technology that converts magnesium into magnesium oxide in a short period of time by using magnesium as the anode metal material for fuel cells.This method can obtain ultra-high purity magnesium oxide,and the production process is environmentally friendly with no industrial waste emissions.

In general,when choosing the preparation method of magnesium oxide,it is necessary to comprehensively consider the source of raw materials,production costs,product quality requirements,and environmental factors.With the advancement of technology and the development needs of industries,there may be more efficient,environmentally friendly,and low-cost new preparation methods developed in the future.