|
[China]
Trade Verify
Address: 11th Floors, Building 6, China Central Electronic Commerce Port, Daxue Road, Zhengzhou, Henan, China
Contact name:Jacky Han
Henan Rongsheng Xinwei New Materials Research Institute Co., Ltd |
|
Verified Suppliers
|
|
|
Rongsheng Refractory Factory Supply Low And Ultra Low Cement Castables For Industrial Furnace
Description of Low and ultra-low Cement Castables
Low and ultra-low Cement Castables have the characteristics of
small pore size, large density, good volume stability, high
strength and small amount of water. They overcome the
characteristics that the strength of ordinary castables decreases
significantly at 800~1200 ℃, increase with the increase of
temperature, and have excellent thermal shock resistance, slag
resistance and corrosion resistance.
Advantages of Low Cement and Ultra-Low Cement Castables:
Compared with ordinary refractory castables, low-water low and
ultra-low cement castables have a series of excellent properties.
Therefore, low cement castables are widely used in the non-ferrous
smelting and steel industry.
First, because the amount of cement added is only 1/2~1/15 of the
ordinary refractory castable, the CaO brought into the castable is
reduced from 2.5~8% to 0~2.5%. Therefore, the amount of the
eutectic phase formed in the matrix is greatly reduced.
Furthermore, the refractoriness, high-temperature strength, and
slag resistance are all improved. As the amount of cement
increases, the refractoriness decreases linearly. On the contrary,
the low melting point is reduced at high temperature, so that the
wear resistance, high-temperature flexural strength, and load
softening temperature of the castable are significantly improved.
Second, the water demand during mixing is only 1/2~1/3 (about 4~6%)
of ordinary refractory castables. Therefore, the porosity is low
and the body density is high, which is comparable to fired
refractory products of the same material. The difference in the
amount of water added results in different strengths of the
castable.
Third, there is little or no cement hydrate after molding and
curing. During the heating and baking, there is no problem that a
large number of hydration bonds are destroyed and the strength is
affected. Instead, as the heat treatment temperature increases, it
gradually sinters and the strength gradually increases. Especially
different from ordinary low cement castables, the mechanical
strength is higher than the drying strength in the
middle-temperature zone (900~1200℃). Both high temperature and
normal temperature strength are better than ordinary castables.
Parameters of Low and ultra-low Cement Castables
| Item | Index | |||
| Clay | High Alumina | Corundum | ||
| Al2O3 % | ≥45 | ≥75 | ≥98 | |
| CaO % | ＜1.8 | ＜1.5 | ＜1.0 | |
| Bulk density g/cm3 | 110℃×24h | ≥2.3 | ≥2.6 | ≥3.1 |
| 1350℃×3h | ≥2.26 | ≥2.61 | / | |
| 1550℃×3h | / | / | ≥3.00 | |
| Cold Crushing Strength MPa | 110℃×24h | ≥70 | ≥75 | ≥85 |
| 1350℃×3h | ≥85 | ≥90 | / | |
| 1550℃×3h | / | / | ≥100 | |
| Flexural Strength MPa | 110℃×24h | ≥6 | ≥8 | ≥9 |
| 1350℃×3h | ≥8 | ≥9 | / | |
| 1550℃×3h | / | / | ≥11 | |
| Permanent linear change Rate % | 1000℃×3h | -0.3 | -0.2 | -0.2 |
| 1350℃×3h | ±0.3 | ±0.5 | / | |
| 1550℃×3h | / | / | ±0.5 | |
| Maximum service temperature ℃ | 1450 | 1600 | 1800 | |
