Study On New Techniques To Produce High Purity Magnesium Carbonate And Magnesia From Magnesite And Dolomite

Magnesium carbonate and magnesia are very important inorganic chemicals for chemistry and engineering industry, which have been extensively used in medicine, food, bond, rubber, plastic, chinaware, fire-resistant material, metallurgy, electronic industry and play important roles in social economy.According to different applications magnesia can be divided into calcined magnesia, fused magnesia, heavy magnesia, industrial magnesia, activated magnesia, silicon-steel magnesia, medicinal magnesia, high purity magnesia, whiskers magnesia, nanometer magnesia and so on. At the same time, magnesium carbonate can also be divided into hydrate magnesium carbonate, medicinal magnesium carbonate, food-grade magnesium carbonate, electronic magnesium carbonate. Based on the shape, magnesium carbonate can be divided into lump magnesium carbonate, transparency magnesium carbonate, acicular magnesium carbonate, and amorphous magnesium carbonate. The prices of different products wave greatly, varying from 400 to 150,000 ï¿¥per ton.The main raw material for producing magnesium carbonate and magnesium are magnesite, dolomite and bitten, which have abundant reserves in our country, especially the reserves of magnesite and dolomite, that not only holds the domain position but also has superior quality in the world, which establish the massy material developing foundation of magnesium industry.Our country is one of the main nations which can produce magnesium carbonate and magnesia in the world and the output of magnesium carbonate and magnesia occupies the definite status. Many countries including America, Russia, Japan and other countries located in Western Europe, Southern Asia all import these materials from China. However, we should realize that we have the ascendant condition of developing magnesium production; there are still many existing problems. Most enterprises and corporations which hold limited bankroll, are small scale and with dated equipment and poor technics. All the problems restricted the enhancing output and quality. The singularity of variety keeps the producing progress stay in the primary stage which can only produce rough, elementary and raw material products but cannot meet the need of development of economy. The top grade and functional...