Refractory brick classification for cement kiln

1, high aluminum brick: Al2O3 content more than 75, refractory degrees higher than clay brick, acid and alkali resistance erosion resistance, suitable for cement kiln etc., the use of long life and high price of refractory brick.
2, the dolomite brick: Hang kiln skin performance is good, good erosion resistance, but there are brick in f-CaO number, hydrated, difficult to transport and storage, production with less.
3, magnesia chrome brick: Hang kiln skin good, used for firing zone, the disadvantage is the thermal shock performance is poor, plus six price Cr is highly toxic, the production and use of magnesite chrome bricks in countries gradually reduced, now with this brick production unit as soon as possible to find alternatives.
4, spinel brick: mainly used for transition zone, earthquake good performance, anti good reducibility, but refractoriness slightly worse.
5, anti flaking brick: this brick contains a small amount of ZrO, martensite phase transformation occurred during the heating process of the formation of fine crack, with strong alkali resistance, spalling resistance and slag resistance of good.
6, phosphate brick: Refractory degree is low, but the intensity of heat shock resistance, used for refrigerating machine, such as the use of kiln hood.
7, silicon carbide brick: high temperature (1800 degrees, refractoriness under load in the 1620-1640), small thermal expansion coefficient, high thermal shock have good wear resistance suitable for cooling zone and kiln mouth.
8, the silicon mullite brick: thermal shock resistance, high strength, good wear resistance, suitable for transition zone.

A Brief Introduction of AOD Refractories

Now magnesia-chromite brick, magnesia-dolomite brick, dolomite brick are the main products used for AOD lining.

There are natural dolomite at good quality in Europe, there calcined dolomite brick to are used generally to construct AOD lining. And magnesia-dolomite brick added with zirconia is used for tuyere, calcined dolomite brick with magnesia is used for slag line. For steel-tapping spout, magensia carbon materials and magnesia dolomo carbon brick are widely used.

The corrosion resistance ability of magnesia chrome brick is high for high alkaline slag with magnesia and low alkaline residue with chrome, it’s the best choice for furnace whose slag composite changes are big, and it is widely used in Japan and America. While because magnesia chrome brick is expensive and chrome can do damage to the environment, so it is used less and less in the recent years. Only a small amount of small converter which doesn’ t work continuously use magnesia chrome brick.

Compared with the past magnesia chrome brick, dolomite brick is cheaper, but its serving is also shorter.

Nowadays becausemagnesia clacia brick has good high-temperature resistance, slagging resistance and thermal shock resistance, and also it can purify molten steel. So it is gradually used in jumbo furnace which work continuouslly, and a trend of taking place of other bricks seems to happen.