The main types of ramming materials include aluminum-mullite ramming materials, high aluminum (or corundum)-silicon carbide-carbon ramming materials, alkaline fireproof ramming materials and zirconium corundum ramming materials.
High aluminum-silicon carbide-carbon ramming materials are composed of high aluminum clinker, silicon carbide, carbon raw materials, binders and additives. They are used as asphalt mixtures for ramming engineering, and are called high aluminum-silicon carbide-carbon ramming materials.
Special grade high alumina bauxite: (High alumina bauxite clinker is made by calcining high alumina bauxite. It is classified by the content of aluminum oxide, and the calcination environment temperature is determined according to the grade of high alumina bauxite. After calcination, aluminum oxide, the main mineral components are zirconium corundum, corundum and glass phase, and some also have a little quartz stone. The content of each phase is determined by the aluminum-silicon ratio: the structure is high-density, continuous high-temperature volume stability, and is an important raw material for manufacturing high-aluminum refractory insulation materials.
This type of ramming material is mainly used as the lining of the iron ditch and slag ditch of the inner and small blast furnaces. The main components of the iron ditch are Al2O3 (aluminum oxide); 45%-69%, SiC (silicon carbide) C (carbon) is 10%~25%, and the main components of the slag ditch material are aluminum oxide 35%-45%, SiC C is 15%~30%.
The high-alumina rock clinker used to configure this type of ramming material requires the residue (compounds, etc.) content to be as low as possible, the water absorption is less than 4.5%, and the particle size composition is 40%-60% large particles, 10%-20% medium particles, and 30%-40% fine particles.
Silicon carbide uses gray-black silicon carbide with a particle size distribution of less than 100 mesh. The raw materials of the carbon plant can be foundry coke or high-purity graphite, which requires low residue content and high fixed carbon content. In order to ensure the calcination characteristics during the use of the ramming material, soft plastic clay or sodium-based bentonite can also be added. According to the different operating environment temperatures, calcining aids under different conditions can also be added.
The binders used in this type of ramming material include asphalt, liquid urea-formaldehyde resin, aluminum dihydrogen phosphate, etc.
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Kind |
Al₂O₃-ZrO₂-C |
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Brand |
HX-GLT |
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Amount required (T/M³) |
2.70 |
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Chemical composition |
(%) Al₂O₃ ZrO₂ |
≥55 ≥3 |
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Permanent linear change after firing (%) at 800℃×2hr |
±0.45 |
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|
Bulk density (g/cm³) after drying at 110℃×24hr Firing at 800℃×2hr |
≥2.53 ≥2.30 |
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Cold crushing strength after firing at |
(MPa) 800℃×2hr |
≥14.5 |
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Characteristics |
Corrosion resistance |
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Applications |
Cupola |
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