Description:
DDR30 Low thermal conductivity Anti-spalling Brick is one high quality refractory brick for Cement Rotary Kilns,made of Synthetic material, Clay.
Characteristics:
1.Outstanding resistance to alkali attack
2.Excellent thermal-shock resistance
3.Excellent abrasion resistance
4.Low thermal conductivity
5.Decreasing the kiln shell load, the mechanical stress on the lining
Application zone:
Safety zone, Pre-heating /Calcining zone in rotary kiln
Physical and chemical index
| Chemical composition |
UNIT |
SPEC |
typical |
| Al2O3 |
% |
≤35 |
32 - 34 |
| SiO2 |
% |
|
62 - 64 |
| Fe2O3 |
% |
≤1.8 |
1.6 |
| |
| Physical properties |
UNIT |
SPEC |
typical |
| Bulk Density |
BD |
g/cm3 |
≤2.2 |
2.1-2.2 |
| Apparent Porosity |
AP |
% |
|
16 |
| Thermal Shock Resistance |
TSR - in water at 1100 °C |
cycle |
≥15 |
16 |
| Refractoriness Under Load |
RUL (ta) |
°C |
≥1310 |
1330 |
| Thermal Expansion |
TE - at 1000 °C |
% |
|
0.6 |
| Cold Crushing Strength |
CCS |
MPa |
≥45 |
57 |
| Thermal Conductivity |
TC - at 700 °C |
W/mK |
≤1.5 |
1.5 |
| Alkali Resistance |
1100 °C*5h |
|
First grade |
Comparision between DDR 30 and Silicon carbide brikcs
| Items |
DDR30 |
Sic bricks |
Advantages of DDR30 |
| Alkali-resistant Test |
fine |
fine |
To form erosion resistance layer on the surface, which protects the refractory grains from penetration of alkalis vapors |
| Anti-spalling |
fine |
fine |
Avoids the alkali spalling without corrosion of kiln shell |
| Thermal conductivity |
low |
high |
Decrease the shell temperature about 50-60ºC, heat loss and energy consumption. |
| Bulk density |
2.1 |
2.6 |
Save 1.5 ton materials per meter of lining, decrease the electric current which save the electricity consumption |
| Usage life (5000t/d) |
3 years |
|
Usage position: 40m-50m |
| 5 years |
|
Usage position: after 50m |
Audited Supplier 
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