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China Fire Resistant High Heat Refractory High Alumina Cement For Boiler
High alumina refractory cement is made of high alumina bauxite and high purity limestone and then burned into cement through a large rotary kiln. Dipping, and finished by grinding, homogenization and other processes. High alumina cement has excellent early strength, a wide range of application, and stable setting time, making it the first choice for refractory castables. High alumina fire cement has many characteristics such as high early strength enhancement, high hydration heat, strong sulfate resistance and high temperature resistance. High alumina cement is applied to the special needs of emergency construction, emergency repair, sulfate resistance and winter construction.
High alumina cement is produced by fusing selected raw material in Special furnace. After cooling, the clinker is ground using ball mills. The raw materials of high alumina refractory cement CA-70 are high purity calcium materials and high pure alumina. The raw materials should be mixed according to suitable ratio. The raw material should be burned to partly fuse. The content of Al2O3 is usually controlled within 68% to 72%. The principal compounds of it are CA and CA2.
.Rapid-hardening, high strength,
.High refractoriness, high-temperature service performance,
.Good resistance to abrasion, high wear resistance,
.Stable hydrating capacity,
.Good anti-corrosion performance,
.High thermal shock stability.
1.Good performance to thermal shock, corrosion, erosion and
abrasion resistance,
2.High refractoriness and excellent mechanical strength,
3.Both intermittently and continuously working mode are acceptable,
reducing lining cracks,
4.Longer and stable life cycle to reach high efficiency,
5.Suit for all kinds of metal types, reduce residue and porosity of
the products,
6.Labor and cost saving by convenient installation and maintenance.
| Item | Unit | 75% Alumina Index | 40% Alumina Index | |
| Al2O3 | % | ≥75 | ≥40 | |
| CaO | % | ≥2.5 | ||
| Bulk density | 110°C×24h | g/cm3 | ≥2.65 | ≥2.3 |
| 1100°C×3h | g/cm3 | ≥2.65 | ≥2.3 | |
| Crushing strength | 110°C×24h | Mpa | ≥45 | ≥40 |
| 1500°C×3h | Mpa | ≥70 | ≥60 | |
| Rupture strength | 110°C×24h | Mpa | ≥6 | ≥6 |
| 1500°C×3h | Mpa | ≥10 | ≥8 | |
| Linear change rate at 1100°C | % | -0.1~-0.5 | ±0.5 | |
| Highest Application Temperature | °C | 1500 | 1350 | |
High alumina cement is mainly used in the special needs of emergency construction, emergency repair, sulfate resistance and winter construction. And high alumina refractory cement is mainly used in urgent project schedules, such as pressure defense, road and special repair projects. Also high alumina fire cement used in the following place:
