Since the rotary kiln is a high-temperature and dynamic kiln, it has high requirements for the masonry of refractory materials.
Before laying the lining material, you should carefully check whether the convexity of the welds in the kiln barrel meets the welding technical requirements of the kiln barrel. Welds that exceed the specified limit should be polished with a portable grinding wheel. Before masonry, the rotary kiln should be thoroughly cleaned, kept clean and dry, and should be free of dust, embroidery, oil and water. Metal corrosion must be removed with steel wire. Ensure good bonding between refractory bricks and kiln barrel.
During the masonry process, the refractory bricks should be close to the kiln barrel, and the refractory bricks should be close to each other. The brick seams are straight, the intersection circle is accurate, the bricks are locked firmly, and they are not in position or sagging or hollowing.
Under the premise that the bottom surface of the bricks is close to the cylinder, ensure that the sides of the bricks are close to each other, which is the so-called "refractory bricks touch the ground at the four corners" (the four corners of the refractory bricks are in contact with the kiln cylinder), and "there is 100% surface contact between the refractory bricks" ". Ensure that all brick joint extension lines converge on the axis of the kiln barrel. It is not allowed to have "four corners not touching the ground" or oblique placement of refractory bricks that are not centered. It is also not allowed to have openings where adjacent refractory bricks are not in 100% surface contact and the big and small ends of the refractory bricks are not close together. This phenomenon of "four corners not touching the ground" and opening of the mouth is prone to loosening of the refractory bricks during operation, which gradually evolves into sagging and hollowing, until the core is pulled out and the bricks fall out.
In order to ensure that the refractory bricks are close to the kiln barrel and there is no gap between the refractory bricks, it is recommended to use ISO and VDZ standard bricks. Make the curvature of the arc made of refractory bricks conform to the curvature of the kiln barrel as much as possible to improve the quality of the masonry.
Since there is a possibility of slight rotation of the entire ring of refractory bricks relative to the cylinder, when laying refractory bricks, staggered joints of longitudinal brick joints are allowed, but staggered joints of circumferential brick joints are never allowed to avoid circumferential rotation. When the tendency is reached, the protruding part of the refractory bricks will be cut off. In order to ensure that circumferential misalignment does not occur, on the premise of ensuring that the outer dimensions of the bricks comply with national or industry standards, it is also necessary to carefully select refractory bricks and properly fill them with refractory mortar.
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