Tap Channel Refractory Castable is used as a castable refractory material for the lining of the tap channel of a blast furnace. It is a type of high-aluminum refractory castable containing silicon carbide and carbon. Tap Channel lining uses tap channel refractory castable, which is a new type of amorphous refractory material developed in the late 20th century. It has the characteristics of high iron throughput, long service life, low refractory material consumption, and convenient construction.
Ingredients: Tap Channel Refractory Castable is mainly made of high-aluminum, silicon carbide, carbonaceous raw materials and binders. High-aluminum raw materials can be selected from one or two of fused or sintered corundum, brown corundum, spinel, and super high-aluminum bauxite clinker.
Silicon carbide raw materials can be selected from primary or secondary black silicon carbide.
Carbonaceous raw materials can be selected from asphalt, coke, graphite or electrode powder, etc.
Binder: Use bonding clay, oxide micropowder or ultrafine powder and pure calcium aluminate cement with good dispersibility.
Technical performance: Choose the type of iron ditch castable reasonably according to the size of blast furnace capacity and the strength of iron ditch heat load.
Technical features: The ditch lining of iron ditch castable does not need to be removed when repairing. After removing the residue and residual iron on the surface of the old lining, it can be repaired and poured. The new and old ditch linings have good bonding ability. Compared with ramming materials, the amount of waste is reduced by more than 50%. After multiple supplementary pouring, the total amount of iron can reach 300,000 to 1 million tons.
Application: Iron ditch castable is suitable for the main iron ditch, iron water ditch, slag ditch and pouring ditch of blast furnace. The blast furnace iron ditch with more than two iron outlets can be cast on site, and the blast furnace iron ditch with a single iron outlet can be made into prefabricated parts for on-site installation.
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product name |
Main trench casting material |
Iron trough castable |
Slag ditch castable |
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Brand |
Iron wire |
Slag line material |
Iron ditch |
Slag ditch material |
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chemical composition ％ |
Al2O3 ≥ |
75 |
59 |
61 |
62 |
|
Fe2O3 ≤ |
10 |
30 |
13 |
15 |
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|
Bulk density g/cm3 ≥ |
110℃×16h |
2.92 |
2.79 |
2.42 |
2.55 |
|
1450℃×3h |
2.88 |
2.75 |
2.40 |
2.40 |
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|
Compressive strength MPa ≥ |
110℃×16h |
31.04 |
28.70 |
8.50 |
17.0 |
|
1450℃×3h |
42.96 |
43.68 |
27.0 |
32.0 |
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|
Flexural strength MPa ≥ |
110℃×16h |
4.75 |
4.36 |
- |
- |
|
1450℃×3h |
5.71 |
5.91 |
- |
- |
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|
Line change rate ％ |
1450℃×3h |
±0.1 |
-0.10 |
＋0.10 |
＋0.30 |
Castables for blast furnace trough
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Kind |
Al₂O₃-SiC-C |
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Brand |
SAC1K |
SAC3K |
SMS1R |
SMC3S |
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(T/M³) Amount required |
2.95 |
2.80 |
2.50 |
2.50 |
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|
Chemical composition |
(%) Al₂O₃ sic |
≥65 ≥8 |
≥50 ≥30 |
≥45 ≥7 |
≥45 ≥12 |
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(%) Permanent linear change after firing at 1450℃×2hr |
±1.0 |
±1.0 |
-- |
-- |
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(g/cm³) Bulk density after drying at 110℃×24hr firing at 1450℃×24hr |
≥2.60 ≥2.50 |
≥2.50 ≥2.50 |
≥2.10 ≥2.00 |
≥2.10 ≥2.00 |
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|
(MPa) Cold crushing strenght after drying at 110℃×24hr firing at 1450℃×2hr |
≥5.0 ≥15.0 |
≥6.0 ≥10.0 |
≥2.0 ≥3.5 |
≥2.0 ≥5.0 |
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Characteristics |
Abrasion resistance Corrosion resistance Fast drying |
Corrosion resistance Fast drying |
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Applications |
Metal zone of main trough |
Slag zone of main trough |
Iron runner Tilting spout |
Slag runner |
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Castable refractories for blast furnace trough may be used easily by casting method with low consumption per ton of pig iron. It shows the developing trend of medium and large size blast furnace trough materials in 1980's.
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