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About Magnesite



Raw Magnesite  
Fused Magnesite  
Ordinary Grade Dead Burned Magnesite  
High Purity Dead Burned Magnesite  
Caustic Calcined Magnesite  
Caustic Calcined Magnesite Ball  
Synthetic Magnesia Refractories  
Monolithic Magnesia Refractories  
Magnesia-based Bricks  
Other Minerals  
Magnesite-based Chemicals  
Other Chemical Products  




About Magnesite



Natural Status of Magnesite

Commodity Category

Nonmetal minerals

Crystal Structure and Habit Trigonal crystal system, shows itself in rhombohedron, often presents dense granular aggregate.
Chemical Composition and Property Essential constituent is magnesium carbonate(MgCO3, among which MgO takes up 47.81%,CO2 takes 52.19% in the chemical constitution. There are often some impurities of oxide compounds such as those of iron, manganese, calcium, silicon etc.

Magnesite shrinks and CO2 is decomposed out when heated to about 640C; it becomes caustic calcined magnesite of loosening lumps of light yellow or white color when heated to 700-1,000C, which is of very strong adhesivity; it is completely decomposed when heated to 1,400-1,800C and forms periclase, becoming dead burned magnesite of dark brown color that is of very high refractoriness; it becomes fused magnesite of white or light brown color when melted to 2,500-3,000C in electric arc furnace, which is of much higher refractoriness and electrical insulating property.

Physical Property  It is of white or light yellow-white or off-white color, sometimes bearing red tone while ceramic magnesite of snow-white color; some variants feel sticky;  with glass glance; hardness is 4-4.5; friable; specific gravity is 2.9-3.1, bigger when containing iron; showing achromatic color under microscope transmitting light; of very high refractoriness and  binding property.
Category 1.Macrocrystalline (coarse crystalline) natural magnesite: belonging to rich-iron and less-rich-in-iron magnesite, produce mainly in China, North Korea, Russia, Czech, Brazil, Spain, and Australia.
2.Cryptocrystalline natural magnesite: belonging to low-iron magnesite, produce mainly in Greece, Turkey, Yugoslavia but resources are on the verge of exhaustion.

The magnesite being produced in Liaoning, China is less-rich-in-iron macrocrystalline natural magnesite featured by enormous deposit, high grade of tenor (MgO≥46% takes up 40%), low cost of exploitation.

Main Applications Magnesite is one of feed minerals for making magnesium as well as refractory for manufacturing refractory bricks, linings of steel-making furnace and the like. Besides, it is widely used in building, chemical, rubber and other industrial fields such as for making magnesite cement, for buildings of heat preservation, heat shielding, sound insulating, and so on. In chemical industry, as mordant, desiccant, dissolution agent, decolorizing agent, neutralizing agent, absorbent. In addition, it is also widely used in the manufacture of artificial fiber, fertilizer, plastic, and cosmetic.
Classification and Definition for Magnesia, Magnesite Goods, Magnesite Finished Products and Magnesite-based Chemicals*
Magnesia Dead burned magnesite and fused magnesite through processes of sintering or melting of magnesite, dolomite or magnesium oxide extracted from serpentine, brucite, sea water, or brine are so called as magnesia. Nowadays in China, magnesia is produced directly from natural magnesite with very low cost while in some other countries it is made from sea water or brine with higher purity but also higher cost.
Magnesite Goods and its Commodity Name, HS Code Magnesite - 25191000, Caustic calcined magnesite - 25199010, Dead burned magnesite - 25199020, Fused magnesite - 25199030, Gunning material - 25199020, only corresponding to those of MgO≥70%). 

Above commodities are now generally designated as magnesite goods and among the lists of commodities of export license control in China.

Magnesite Finished Products Finished products processed from above mentioned magnesite goods and mainly used in refractory field such as various magnesia-based bricks, caustic calcined magnesite ball/briquette and gunning materials etc. that contain MgO<70%.
Magnesite-based Chemicals Those chemically made of magnesite such as magnesium oxide, lightweight magnesium oxide, magnesium sulphate, magnesium carbonate, and magnesium fertilizer.
Status of Production and Consumption of Magnesite Goods**
World Status of Production and Consumption
Reserves and Geographic Distribution There are about 3.5 billion tons of natural magnesite reserve in the world mainly distributed in China, Russia, North Korea, Brazil, Australia, Turkey, Greece, India, and USA.
Output and Distribution The world's annual output including calcined magnesite, dead burned magnesite and fused magnesite is about 7 million tons, mainly from countries of China, North Korea, Turkey, India, Russia, Australia, Greece, Spain, Yugoslavia, Czech, Brazil, Austria etc.
Main Consuming Country or Region USA, Europe, Japan, Korea, Southeast Asia, China, Taiwan of China, etc.

 * The category and definition only represent opinions of this site.
** The data are cited from the CCCMC relevant information,  some of which were modified by this site.



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