Pressed-in repair material is a paste or slurry amorphous refractory material constructed by extrusion method, also known as pressed material. It is composed of refractory aggregate, powder, binder and admixture, and water or liquid binder is added to mix when used.
Pressed-in materials include: high-alumina, alumina (corundum), aluminum-magnesium, aluminum-carbon, magnesium-carbon refractory press-in materials, etc. The raw materials used for high-alumina refractory press-in materials are high-alumina aggregate and high-alumina powder, and the binder is mainly calcium aluminate cement, sodium silicate, etc. Add an appropriate amount of admixture. After adding 10% to 15% water and mixing evenly, the press-in construction can be carried out.
Alumina (corundum) refractory press-in materials are composed of corundum fine aggregate, corundum powder, pure calcium aluminate cement and admixtures, and 10% to 12% water is added to mix.
Aluminum-magnesium refractory injection material is prepared by adding an appropriate amount of fused magnesia powder or sintered magnesia powder to alumina refractory injection material. Since aluminum-magnesium injection material forms magnesia-aluminum spinel during use, it has good high-temperature mechanical properties and slag corrosion resistance.
The raw materials used for aluminum-carbon refractory injection material are high-aluminum (or clay) fine aggregate, high-aluminum (or clay) powder and carbon materials. The binder is liquid phenolic resin. Refractory injection material is mainly used in blast furnace body, hot spots of rotary kiln lining, RH soil riser and top and bottom combined STB converter small furnace bottom, converter tapping port, etc. Blast furnace body injection repair generally uses aluminum-silicon and high-aluminum refractory injection material, and cement rotary kiln uses high-aluminum refractory injection material.
Injection materials for repairing
|
Kind |
High alumina |
High alumina |
||
|
Brand |
HX-H111B |
HX-HW4 |
||
|
Max.service temperature |
(℃) |
1800 |
-- |
|
|
Amount required |
(T/M³) |
2.95 |
2.65 |
|
|
(%) Additional water |
10～13 |
12～14 |
||
|
Chemical composition |
(%) Al₂O₃ |
≥92 |
≥80 |
|
|
(℃) Refractoriness |
≥1850 |
-- |
||
|
(g/cm³) Bulk density after drying at 110℃×24h firing at 1300℃×3hr 1500℃×3hr |
-- -- ≥2.50 |
≥2.20 ≥2.25 -- |
||
|
(%) Permanent linear change after firing at 1500℃×3hr |
±1.0 |
-- |
||
|
(MPa) Cold crushing strength after drying at 110℃×24hr firing at 1300℃×3hr |
-- -- |
≥39.2 ≥29.4 |
||
|
(MPa) Cold modulus of rupture after drying at 110℃×24hr |
≥3.92 |
-- |
||
|
(Mpa) Hot modulus of rupture At 1400℃×1hr |
≥1.47 |
-- |
||
|
Characteristics |
Abrasion resistance |
Heat set Chemical bonded |
||
|
Applications |
Repair of RH snorkel |
Blast furnace shaft |
||
Once refractory lining of blast furnace,rotary kiln etc,is damaged,hot spots on the steel shell will appear. Several holes on the hot spots can be made,on which nozzles are fixed.New lining will be formed,as repairing materials are injected in the damaged areas.
Hot Tags: refractory repair material, China refractory repair material manufacturers, suppliers, factory, Hot Blast Furnace Refractory Spray Coating, High Strength and Wear-resistant Castable, Refractory Repair Material, Steel Fiber Castable, Silicon Carbide Ramming Mass, Self-flowing Castables