What are the advantages and disadvantages of refractory ramming material?

As the name suggests, refractory ramming material is an unshaped refractory material constructed by ramming. If the same raw materials are used as refractory castables, the density is not as high as that of refractory castables.

The process of refractory ramming material is made up of granular materials, binders and other components. It can also be composed of all granular and powdery materials, and can be constructed by strong ramming.

In general, the ramming material is made of silicon carbide, graphite, and electric calcined anthracite as raw materials, using micropowder technology, adding fused cement or composite resin as a binder and stirring the bulk material. It is used in filling furnace cooling equipment and masonry. Filler for gap or masonry leveling layer. Ramming material has good chemical stability, erosion resistance, abrasion resistance, spalling resistance and thermal shock resistance.

The selection of the binder of the refractory ramming material should be appropriate, some do not need a binder, and some only add a small amount of flux. Acid ramming materials are commonly used binders such as sodium silicate, ethyl silicate, silica gel, etc., among which dry ramming materials Borates are often used; magnesium chlorides and sulfates are commonly used in alkaline ramming materials; organics and temporary binders with high carbon content that can form carbon bonds at high temperatures are also often used. Among them, dry ramming Add an appropriate amount of iron-containing flux. Chromium ramming materials are commonly used for mango pins.

After the refractory ramming material is rammed and formed, different heating methods can be used to promote its hardening and sintering according to the hardening characteristics of the mixture. If it contains an inorganic chemical binder, it can be demolded and baked after it hardens to a considerable strength; it contains thermoplastic The carbon binder, which has considerable strength after cooling, should be released from the mold, and should be quickly heated to coking before use; and the binder that does not contain hardening at room temperature is often sintered with a mold after tamping.

The advantage of the refractory ramming material is that the refractory ramming material can be thrown on the spot, rammed with air picks or machinery, and the amount of material is small or the parts that are not important can also be knotted by hand. Therefore, the lining of the refractory ramming material , Its moisture content is low, it is dense and compact, and its performance is better than that of refractory castables of the same material. The disadvantage of refractory ramming materials is that the construction speed is slow and labor intensity is high.