Fire Clay Brick

Fire Clay Brick

1.Good resistance to corrosion and abrasion,
2.Perfect thermal shock resistance,
3.Good spalling resistance,
4.High mechanical strength,
5.Good volume stability under high temperature,
6.Excellent thermal performance, and acid resistance.

  Description

Fireclay brick is also called chamotte brick. It is acidic firebrick. The higher SiO2 content, the stronger acid corrosion resistance. Fireclay brick has certain degree of acid slag corrosion resistance, but its alkaline slag corrosion resistance is not good. Therefore, fireclay brick is usually used as acidic kilns inner lining. The main applications of fireclay  bricks are blast furnace, hot blast furnace, glass furnace, carbon furnace, etc. 

  Technical Data:

ITME SK 31 SK 30 SK 30 SK 29 SK 29 SK 28 SK 27
CHINA CODE N-1 N-2a N-2b N-3a N-3b N-4 N-5
Refractoriness ℃ 1750 1730 1730 1710 1710 1690 1670
Al2O3 % 40 39 34 34 32 32 31
Fe2O3 % 2.1 2.1 2.3 2.3 2.5 2.5 2.5
Apparent Porosity% 22 24 26 24 26 24 26
Bulk Density g/cm3 2.15 2.1 2.1 2.05 2.05 2.05 2
Cold Crushing Strength
 Mpa
30 25 20 20 15 20 15
0.2Mpa Refractoriness 
Under Load T0.6 ℃ ≥
1400 1350 1350 1320 1320 1300 1300
Reheating Linear Change
1400℃
0.1–0.4 0.1–0.5 0.2–0.5        
Reheating Linear Change
1350℃
      0.2–0.5 0.2–0.5 0.2–0.5 0.2-0

  Application:

Fireclay bricks is the most widely used firebricks with the largest output in  the world. They are used to build working lining and permanent linings of various kinds of thermal equipment and kilns. For example, fireclay bricks are widely used in blast furnace,  hot blast furnace, glass furnace, etc.

Blast furnace fireclay bricks are mainly used at small blast furnace throat, furnace bosh, furnace hearth and furnace bottom, large blast furnace bosh. Blast furnace fireclay bricks have high cold crushing strength, long term furnace load wear resistance, small volume shrinkage at high temperature working condition, so furnace lining integrity can be kept. Besides, blast furnace fireclay brick should have low apparent porosity, low Fe2O3 content, so carbon won’t deposit in pores. 

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