Low cement castable
Zinc volatilization kilns are all produced and operated in a rotary kiln mode. The refractory bricks used in the kiln lining of the rotary kiln need to be of the right material and accurate size. Only in this way can the kiln body operate normally and the service life be extended.
However, the tail smoke chamber of the kiln, that is, the part of the settling chamber, uses clay bricks or casts low cement refractory castables as linings. Generally, low cement castables are used more, and clay bricks are used as linings. The shape of the settling chamber is cone-shaped, large at the top and small at the bottom, which facilitates the smooth discharge of smoke and dust. Because if this part is designed to be small or the discharge port is not designed reasonably and is too small, there will be a beating of this part in normal work to accelerate the discharge of smoke and dust.
At present, according to the situation of the manufacturer, some manufacturers do not do any lining treatment in the lower cone section of the settling chamber. The reason is that this part is often beaten, and the lining is also beaten off, which does not play any role. Instead, it wastes the castables used and increases the cost.
So should this part be lined with low-cement refractory castables or bricks? In principle, it is still necessary. If steel fibers are added to the castables in the cone section to increase the Dara effect, it still has a certain effect. If the taper section feed opening is too small, the effect of low-cement castables is not too great.
In short, whether this part is built with low-cement castables or nothing depends entirely on the actual situation. If the taper section feed opening is too small, there is no need to make a lining. If the feed opening is of a reasonable size, it is better to use low-cement castables to cast the lining.
If low-cement castables are used in sedimentation chambers, steel fibers are generally not needed.
In general, high-aluminum castables and low-cement castables are more common, but clay bricks are also used as the lining of sedimentation chambers. High-aluminum castables are also used to add a certain proportion of high-voltage electric porcelain to make the castables glazed to facilitate the landing of smoke and dust.
Adding steel fibers to low-cement castables is not common in sedimentation chambers. In recent years, the sedimentation chambers of some lime rotary kilns and zinc volatilization kilns are mostly lined with clay bricks. However, the size design of some sedimentation chambers is not reasonable. When the sedimentation chamber is too small and the taper discharge port is also small, the smoke and dust will be slapped during the production process. This accelerates the service life of the clay bricks or low-cement castables lined in the cone section.
Therefore, in special cases, a reasonable proportion of steel fibers are added to the low-cement castable to increase the wear resistance of the cone section and increase its service life.
HOME