It is mainly used to produce magnesium oxide or magnesia (mgo) by calcining. mgo is used to produce various medicines, cement, to preserve books, etc. along with dolomite minerals, magnesium carbonate is used to produce refractory bricks. it is also used in the manufacture Magnesium oxide is the most commercially important of the magnesium chemicals. china continues to dominate the market as the largest producer and consumer of magnesium oxide, as well as the largest global exporter. in 2016, 83% of chinese magnesium oxide exports were refractory magnesia for use in steel manufacture and cement production. In 1874, other companies had bought the right to use the solvay process in their own plants. now the sodium carbonate production market became a booming industry with several plants opening worldwide. in 1890s, solvay-based process plants produced the majority of the world's soda ash. Us magnesium is the largest producer of primary magnesium in north america, operating facilities on the great salt lake where magnesium has been produced since 1972. the company has repeatedly made significant capital investments to increase magnesium production capacity, while concurrently reducing the environmental footprint.