INTRODUCTION

Dead-burned dolomite is produced when dolomite is calcined at very high temperatures. It is used both as a refractory product in granular form to repair linings and for making the bricks used in the refractory linings of casting ladles and cement kilns.
Calcined dolomite is a material that plays an important role in the steel sector, both for its purifying action and for the protection of refractory linings. Calcium and magnesium oxide or calcined dolomite are obtained from dolomitic minerals such as calcium carbonate and magnesium (Ca Mg (CO3) 2, through the calcination process.  In other words, burnt dolomite is a result of calcination of natural dolomite lumps which contains 28% to 30% CaCO3 and 19% to 21% MgCO3. On calcination, calcium oxide contains becomes 50% to 55% and Magnesium Contains 30% to 35%. 
Ca Mg (CO3)2 + Heat → CaO MgO
Calcined dolomite is found in applications in the iron and steel industry, such as in scorifiers and refractory lining protectors, in agriculture as a soil conditioner and in the environmental sector in water treatment, among others
 

APPLICATION

1-Metallurgy (pig iron, ferromanganese, sponge iron,

steel):

Dolomite is added to the raw material mix for manufacturing pig iron, sponge iron, ferromanganese and steel for fulfilling certain specific purposes.

2-Refractory (basic):

Refractory materials are defined as those resistant to heat and having a melting temperature of not less than 15800 C. The function of Dolomite in refractories is as a lining on the furnace which helps to not only withstand high temperature, but to also withstand temperature fluctuation, and to resist penetration, abrasion, and erosion by hot gases and molten materials.

3-Glass:

Chemically, glass is a mixture of the silicates of sodium, calcium and magnesium. The composition of typical ordinary glass is

[18Na2O.2MgO.8CaO.72SiO2]. Ordinary glass contains 4-5% magnesia and some special glasses may contain up to 15% of it. This magnesium is contributed by dolomite.