As one of the important raw materials for alkaline refractories, dolomite is second only to magnesite, mainly used in steelmaking converter lining, open hearth furnace, electric furnace wall, and secondly used in furnace refining equipment and cement kiln,etc.
Dolomite can produce dolomite brick series (currently there are conventional dolomite brick, zirconium dolomite brick, zirconium magnesium dolomite brick, etc.), fused dolomite carbon brick and fused magnesium dolomite carbon brick. The results of the latter two indicate that the fused dolomite carbon bricks are better than the sintered synthetic magnesium dolomite carbon bricks, and are similar to the magnesia carbon bricks. In addition, when the high-purity dolomite is added to the iron ore to be calcined by the tar dolomite brick, the life of the furnace can be significantly improved by using the method of spraying the dolomite material.In the cement rotary kiln, compared with the magnesium spinel brick and the magnesia chrome brick, the dolomite brick series is more suitable for the high temperature sintering belt lining. However, as a refractory material, the hydration of dolomite bricks is susceptible to their use and performance. Therefore, in the sand making and brick making, a process which is often adopted for improving the hydration resistance. For example, two-step calcination method is adopted, dolomite sand having a lower sintering temperature and a higher density is obtained by mechanical and additive activation. Therefore, the current sand making process is developing in the direction of fused and high-purity sintered sand and synthetic sand.