Introduction to the construction method of ramming material

Ramming materials include clay, high alumina, carbon, magnesia and dolomite ramming materials.

In the construction of high alumina ramming material and clay ramming material, the coarse and fine aggregates should be mixed with high alumina cement binder for 2 minutes, and then a certain amount of water should be added for mixing for 5 minutes. The thickness of the material is 80-100mm in one construction, and it is rammed with a pneumatic hammer. The number of times it reaches the bulk density stops.

The carbonaceous ramming material is constructed by cold ramming or hot ramming. Cold ramming is more convenient than hot ramming, and cold ramming is generally put into use directly. The ramming material must be broken first during hot ramming, and the heating temperature is based on the mixing temperature of the finished product. It depends. When heated until there are no hard lumps, when the ramming hammer head is heated to 70 degrees Celsius and turns dark brown, then ramming in layers, the thickness of each layer cannot exceed 100mm. When ramming, press half a hammer with one hammer and ram it back and forth several times. Check for compactness or compaction. The compaction ratio is 40-45 percent. Before ramming the next layer of ramming material, roughen the surface of the upper layer. Make the upper base layer tightly combined.

Before the magnesia ramming material is constructed, the coal tar should be heated to 130 degrees Celsius for dehydration, and the magnesia sand and iron oxide powder should be heated to 110 degrees Celsius for drying. The magnesia ramming material is mostly used in converters, electric furnaces, flash furnaces, and reverberatory furnaces. Bottom of the furnace.

The magnesia ramming material should be heated and dried on the surface of the wet brick masonry after the refractory brick masonry is finished. Then carry out ramming. When ramming, pour the mixed ramming material into layers. The thickness of each layer is 70-80mm, the compression ratio is 50%, and the ramming is carried out from the center of the furnace to 4 weeks. Avoid oily Squeeze to the center to form a spring body. The wind pressure during ramming should not be less than 0.5Mpa.