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The difference between hot carbon ramming and cold ramming

April 24, 2024

There are two kinds of carbon ramming paste: hot ramming paste and cold ramming paste. Hot ramming paste and cold ramming carbon materials are amorphous refractory materials composed of powder-grained refractory materials and binders. Cold ramming carbon materials are generally recommended.


Before ramming, the carbon ramming material must be broken and heated. The heating temperature is determined according to the uniform mixing temperature of the finished material. If there is no hard block in the heated carbon material, it can be laid and rammed. Use a hot hammer when ramming, and the material temperature is not lower than 70℃. When using hot stamping, the hammer head should be heated dark red, and the wind pressure should not be less than 0.5MPa. The upper and lower layers should be staggered at a certain Angle, and the ramming should be carried out continuously, so as to prevent stratification. "Shave" or brush the adhesive on the surface of each strip before spreading and ramming. When ramming, it is necessary to press a half hammer or a third of the hammer in a zigzag back and forth ramming 2-3 times.


When ramming the cold ramming paste, due to product process upgrading, no heating material is needed, and the construction does not need to stir, the material can be directly poured into the use part, manual or mechanical method of construction, the ramming material is also a hammer press half hammer way of ramming, but it should be noted that the thickness of each ramming can not exceed 100mm. Ramming compaction (reference compression ratio of 40-45%), if you need to increase the thickness, you can lay a second layer of ramming, but before laying the surface of the upper layer must be brushed, so that the upper and lower layers are combined with dense, the wind pressure during ramming and the wind pressure of hot stamping, can not be less than 0.5Mpa.


Carbon ramming material is mainly used for the gap between the furnace bottom carbon brick and the furnace bottom seal plate, or the gap between the furnace cylinder carbon brick and the cooling wall, as well as the leveling above the center line of the furnace bottom water cooling pipe and the filling of the cooling wall, filled with every corner and very small gaps, to achieve the requirements of no leakage of hot metal and gas.


The biggest difference between hot ramming and cold ramming of carbon ramming paste is that cold stamping has changed the old process method of traditional hot stamping, the working conditions and the lining performance has been improved.