I. Service temperature of magnesia-chrome brick

Magnesia-chrome brick is a high-performance basic refractory with excellent high-temperature performance and corrosion resistance. Its use temperature range usually depends on the specific application scenarios and brick types:

Ordinary sintered magnesia-chrome brick: the fire resistance is usually above 2000℃, and the softening temperature under load is generally above 1550℃.

Directly bonded magnesia-chrome brick: the softening temperature under load is relatively high, generally above 1600℃.

Melted magnesia-chrome brick: It has higher load softening temperature and excellent high temperature strength, and is suitable for extremely high temperature environment.

II. Usage of magnesia-chrome brick

(1) Preparation before installation

Check the quality of the brick: make sure that the appearance of the brick has no cracks, deformation or other defects.

Cleaning furnace lining: Before installation, thoroughly clean the surface of furnace lining to remove dust, oil and other impurities.

(2) Installation method

Dry masonry method: most magnesia-chrome bricks are installed by dry masonry method, that is, no mud is used. Close contact and proper staggered joints between bricks ensure structural stability.

Wet masonry method: in some cases, if it is necessary to strengthen the bonding strength between bricks, refractory mud can be used for wet masonry.

(3) oven drying and heating up

Slow heating: Before use, the furnace body needs to be slowly heated to avoid thermal stress caused by excessive temperature change.

Oven curve: according to the specific furnace type and brick type, make a reasonable oven curve. It usually includes low temperature stage (100℃-300℃), medium temperature stage (300℃-800℃) and high temperature stage (above 800℃), and the heating rate of each stage should be controlled within a reasonable range.

(4) Matters needing attention in use

Avoid sudden temperature change: during use, try to avoid sudden temperature change in the furnace to reduce the thermal shock damage of the brick body.

Regular inspection: check the wear and erosion of brick regularly, and find and deal with problems in time.

Reasonable maintenance: refractory castable can be used to repair the partially damaged brick body.

(5) Special application

Cement rotary kiln: In the firing zone of cement rotary kiln, magnesia-chrome brick can resist the erosion of high temperature and alkaline atmosphere.

Steelmaking furnace: In the lining and refining device of steelmaking furnace, magnesia-chrome brick can withstand high temperature and chemical erosion.

Glass melting furnace: in the regenerator and superstructure of glass melting furnace, magnesia-chrome brick can withstand the corrosion of high temperature atmosphere and alkaline glass liquid.

By reasonably selecting the type and application method of magnesia-chrome brick, its high temperature performance and corrosion resistance can be fully exerted, thus prolonging the service life of furnace body and improving production efficiency.