During the use of settling chamber, low cement castable is a common material choice. Generally, if the structure of the settling chamber is reasonably designed, low cement castable can meet the basic requirements without adding additional steel fiber when used. However, when the lower opening size of the cone section of the settling chamber is too small, resulting in the need to pat the smoke dust to sink during use, the situation will be different. Under this special working condition, in order to enhance the pulling performance, wear resistance and scouring resistance of the low cement castable, it is necessary to add an appropriate amount of steel fiber to the low cement castable used in the cone section.
The main function of the settling chamber is dust removal, and its internal temperature is relatively low. Before the flue gas flows out of the settling chamber, the dust will settle to the bottom due to gravity and be collected by the storage ash hopper at the bottom of the settling chamber. Those dusts that fail to settle in time will be taken out with the flue gas. Therefore, from a functional point of view, ordinary low cement castables can already meet the use requirements of the settling chamber well.
In practical applications, high-aluminum castables and low-cement castables are more common choices, but some settling chambers are lined with clay bricks. In addition, there are some special processes, such as adding a certain proportion of high-voltage electric porcelain to the high-aluminum castable to form a glaze on its surface, which is more conducive to the sedimentation of smoke and dust. However, it should be pointed out that the addition of steel fiber to low-cement castables is relatively rare in the application of settling chambers.
In recent years, the settling chambers of some lime rotary kilns and zinc volatilization kilns mostly use clay bricks as lining materials. However, in the design of some settling chambers, their size is not reasonable, especially when the settling chamber is too small as a whole and the taper section discharge port is also small, the production process has to use the patting method to promote the smoke and dust to sink. This operation method will undoubtedly accelerate the wear of the lining material of the cone section, and the service life of both clay bricks and low-cement castables will be shortened.
In this special case, it is particularly important to reasonably add an appropriate amount of steel fiber to the low-cement castable. In this way, the wear resistance of the cone section can be significantly enhanced, thereby extending its service life and improving the overall operating efficiency and stability of the sedimentation chamber.
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