The refractory ramming material is prepared from a high proportion of granular and powdery materials and a very low proportion of binders and other components, even all of which are composed of granules and powders, and are subject to strong ramming. Bulk materials for construction.
Ramming material for blast furnace
The refractory ramming material is prepared from a high proportion of granular and powdery materials and a very low proportion of binders and other components, and even all of them are composed of granules and powders. Bulk materials for construction.
Because the material is mainly used for the direct contact with the molten material, it is required that the granular and powdery materials must have high volume stability, compactness and corrosion resistance, and the induction furnace should also have insulation.
Compared with other unshaped refractories of the same material, the ramming material is dry or semi-dry and loose, and a dense structure is obtained by strong ramming. Only when heated to a sintering degree, the combined body material has strength.
After the ramming material is formed, different heating methods can be adopted to promote its hardening or sintering according to the hardening characteristics of the mixture. If it contains inorganic chemical binder, it will harden on its own.
It can be demolded and baked after having a considerable strength; if it contains a thermoplastic carbon mixture, it will be demolded after cooling to have a considerable strength, and it should be heated quickly before use to make it coking; and it does not contain a binder that hardens at room temperature, often after tamping. Sintered with die row.
item |
GT-1 |
GT-2 |
GT-3 |
|
Al2O3 |
60 |
58 |
58 |
|
Sic+C |
20 |
13 |
12 |
|
Bulk density(g/cm3)≥ |
110℃×25h |
2.35 |
2.30 |
2.40 |
Line rate of change% |
1450℃×3h |
±0.5 |
±1.0 |
±0.8 |
Compressive strength |
110℃×24h |
5 |
10 |
10 |
1450℃×3h |
35 |
20 |
1.5 |
|
use |
Small blast furnace main trench working layer |
Small blast furnace branch trench working layer |
No-bake ramming material |
The use and characteristics of ramming material:
For small blast furnace tapping system with only single tap hole or local emergency repair of large and medium blast furnace tapping system, the ramming materials listed in the above table can be used.
Among them: GT-3 is a non-baking ramming material, which adopts a new type of combination system, which does not generate water vapor during the use process, so that the iron can be directly tapped after ramming construction without any test. Thereby improving the operation of the equipment; the purpose of efficiency.
It can be widely used in the main ditch of the tap ditch of medium and small blast furnaces and all parts of the tap ditch that need to be fast.
Insulation castables are mainly made up of lightweight refractory aggregates, powders, and binder additives.
Corundum self flowing castable is a high-tech product developed according to the theory of solid fluid and combined with the application characteristics of refractory materials, which is the first in China. The corundum self-flowing material can be degassed and leveled without vibration with the help of its own gravity, so as to achieve densification.
The refractoriness of clay bricks is comparable to that of silica bricks, up to 1690~1730℃, but the softening temperature under load is more than 200℃ lower than that of silica bricks. Because in addition to the high refractory mullite crystal, the clay brick also contains nearly half of the low melting point amorphous glass phase.
Common low-creep high-alumina bricks can be used in blast furnace hot blast stoves, as well as other industrial kilns, and can also be made into low-creep high-alumina bricks of different sizes according to specific construction requirements, such as lattice bricks, special-shaped bricks, anchor bricks, etc. , mainly used in industrial kilns in long-term high temperature environments
silicon mullite brick is a kind of refractory brick product made of super high alumina bauxite and silicon carbide as raw materials through a special sintering process. It has the characteristics of continuously forming a protective layer and reducing ring formation, and its heat resistance is also very good. The softening temperature under load can reach 1600 ℃, and the service life is long. Mainly used in the transition zone, decomposition zone and cooler of small and medium-sized cement kilns.
White corundum is made from industrial alumina powder, which is smelted in an arc at a high temperature above 2000 ℃ and then cooled. After crushing and shaping, magnetic separation to remove iron, it is divided into various particle sizes.
Calcined alumina is a product obtained by calcining aluminum hydroxide at high temperature to partially or almost completely convert it into aAl2O2.
Refractory ramming mass (refractory taphole mass) is a kind of Refractory used for lining of blast furnace tapping groove. It is mainly used to protect the blast furnace out of the ditch from high-temperature hot metal and slag erosion and erosion, and has excellent high-temperature resistance and wear resistance. The ramming material for the iron discharge ditch is usually composed of corundum, silicon carbide and carbonaceous material, which has the ability of resisting hot metal and molten slag erosion and scouring, reburning line change small, strong resistance to a variety of oxidation characteristics. The construction of the ramming material for the iron ditch is convenient, easy to dismantle and repair, does not produce harmful gas, and is beneficial to environmental protection.