Description of Refractory Cement CA
Aluminate cement is made from bauxite and limestone, calcined to produce clinker with calcium aluminate as the main component, and then ground to form a water-resistant cementitious material. Its color varies, but is usually yellow or brown, although gray is sometimes found. Calcium aluminate is most widely used as a binder for unshaped refractory materials.
Characteristics of cement CA50/70/80
| Subject/Sort | CA50 | CA70 | CA80 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A600 | A700 | A900 | CA70 | CA70W | CA70S | CA71 | CA80 | CA80S | |||
| Chemical composition | ω (SiO2) ≤/% | 7.8 | 7.5 | 5.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| ω (Al2O3)/% | 50.0 | 51.0 | 53.5 | 68.5-70.5 | 68.5-70.5 | 68.5-70.5 | 69.5-71.5 | 78.0-81.0 | 78.0-81.0 | ||
| ω (Fe2O3) ≤/% | 2.5 | 2.5 | 2.5 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | ||
| ω (CaO)/% | / | / | / | 28.5-30.5 | 28.5-30.5 | 28.5-30.5 | 27.5-29.5 | 17.5-20.5 | 17.5-20.5 | ||
| ω (MgO) ≤/% | / | / | / | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (R2O) ≤/% | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (S) ≤/% | 0.1 | 0.1 | 0.1 | / | / | / | / | / | / | ||
| ω (Cl) ≤/% | 0.1 | 0.1 | 0.1 | / | / | / | / | / | / | ||
| Fineness | d50/μm | / | / | / | 11-4 | 8-11 | 6-9 | 10-13 | 5-8 | 5-8 | |
| -45μm ≤/% | / | / | / | 8.0 | 5.0 | 5.0 | 8.0 | 5.0 | 5.0 | ||
| Installation time | Initial setup time (min) | ≥45 | ≥60 | ≥90 | 120-180 | 30-90 | 180-240 | 150-210 | 30-90 | 90-150 | |
| Final setting time (min) | ≤6 | ≤6 | ≤6 | 150-240 | 90-180 | 240-330 | 210-300 | 90-180 | 270-360 | ||
| Strength (ISO) | Bending strength/MPa | 24h | 6.0 | 6.5 | 8.0 | 7.5-10.0 | 8.0-10.5 | 8.0-10.5 | 8.5-11.0 | 5.0-7.5 | 5.0-7.5 |
| 72h | 7.0 | 7.5 | 10.0 | 10.0-12.0 | 10.5-12.5 | 10.5-12.5 | 11.0-12.5 | 6.0-8.5 | 6.0-8.5 | ||
| Compressive strength/MPa | 24h | 45 | 55 | 72 | 40-50 | 45-55 | 45-55 | 50-60 | 30-40 | 30-40 | |
| 72h | 55 | 65 | 82 | 45-55 | 50-60 | 50-60 | 55-65 | 40-50 | 40-50 | ||
| 325M Остаток на сите, ≤/% | 15 | 12 | 8 | / | / | / | / | / | / | ||
| Specific surface area ≥/(㎡/kg) | 300 | 320 | 350 | / | / | / | / | / | / | ||
Properties of refractory cement CA
(1) Cold resistance: Aluminate cement can maintain good strength under low temperature conditions and has good cold resistance.
(2) Refractoriness： Aluminate cement has high fire resistance and can withstand high temperature up to 1300℃.
(3) Resistance to sulfate corrosion: Aluminate cement has strong sulfate resistance, and can be used in the engineering field of sulfate corrosion resistance.
Application of CA refractory cement
Aluminate cement is widely used in various high temperature, corrosion resistant and special engineering fields, such as:
- Refractory industry: used in the production of various types of refractory castings, refractory bricks and other refractory materials.
- Chemical industry: It is used in fertilizer plants, oil refineries, chemical plants and other equipment and anti-corrosion lining of pipelines.
- Water protection equipment: used in cement concrete dams, embankments, canals and other water conservation projects to resist sulfate corrosion.
- Mining industry: It is used in underground mine supports, road pavement and other anti-corrosion and anti-sulfate corrosion projects.
- Metallurgical industry: used for refractory lining of blast furnaces, electric furnaces, smelting furnaces and other equipment.