(1) Refractory brick linings are divided into four categories according to the size of the brick joints and the fineness of the operation. The category and the size of the brick joints are: Class I, ≤0.5mm; Class II, ≤1mm; Class III, ≤2mm; Class IV, ≤3mm The refractory lining of the rotary kiln system is built with fire clay, and the ash joint should be 2mm. Within, the construction should be strictly controlled. The fire mud in the ash joints of the lining of the stationary equipment should be full, and the brick joints of the upper and lower layers and the inner and outer layers should be staggered.
(2) The preparation of refractory mud for bricklaying should follow the following principles: ①Before laying bricks, various refractory muds should be pre-experimented and pre-laid, and the bonding time, initial setting time, consistency and water consumption of different muds should be determined; Different slurries should use different utensils and be cleaned in time; 3. To prepare different types of slurries, use clean water. Hydraulic and gas-hardening muds that have already been prepared shall not be used with additional water, and the muds that have been initially coagulated shall not be used further; ④ When preparing phosphate-binding muds, ensure the specified trapping time, and adjust as needed, and the prepared muds shall not be arbitrarily used. Dilute with water. Due to its corrosive nature, this mud must not come into direct contact with the metal casing.
(3) The variety and layout of refractory bricks are built according to the design plan. During masonry, the brick joints should be straight, the arc surface is smooth, and the masonry should be dense. For the refractory lining of the kiln tube, it is also necessary to ensure that the brick ring and the kiln tube are reliably concentric, so it should be ensured that the brick surface and the kiln tube body are completely tight, and the bricks should be in surface contact and firmly bonded. When building the brick lining of the immovable equipment, the fullness of the fire mud should reach more than 95%, and the surface brick joints should be jointed with original mortar, but the excess mud on the surface of the brick lining should be scraped off in time.
(3) When laying bricks, flexible tools such as wooden hammers, rubber hammers or hard plastic hammers should be used, and steel hammers should not be used.
(4) The fire-resistant and heat-insulating composite lining of masonry equipment shall be built in layers and sections, and it is strictly forbidden to build mixed-layer mortar. The masonry insulation lining should also be filled with grout and seams. When encountering holes and riveting and welding parts, bricks or plates should be processed, and the gaps should be filled with mud. Arbitrary paving, leaving gaps or not using mud is prohibited. In the insulation layer, all places under the anchoring bricks and behind the arching bricks, around the holes and contact expansion should be replaced with refractory bricks. Expansion joints in refractory brick linings must be left as designed and must not be omitted. The width of the expansion joint should not have a negative tolerance, and no hard debris should be left in the joint, and the joint should be filled with refractory fibers to avoid the phenomenon of being full outside and empty inside. Generally, expansion joints may not be provided in the thermal insulation layer. The lining of important parts and parts with complex shapes should be pre-laid first. For the lining with extremely complex structure and too much brick processing, it can be considered as castable lining. The exposed metal parts left in the brick lining, including the brick supporting board and the brick blocking board, should be sealed with special-shaped bricks, castables or refractory fibers, and should not be directly exposed to hot kiln gas during use. Anchor bricks are structural bricks of masonry, which should be reserved according to the design regulations and must not be omitted. Cracked anchor bricks shall not be used around the hanging holes. The metal hooks should be placed flat and solid. Hanging holes and hooks cannot be stuck, and the remaining gaps can be filled with refractory fibers.
(5) When building capping bricks, joint bricks and curved bricks, if the original bricks cannot meet the sealing requirements, a brick cutter should be used to finish the bricks, and manual processing bricks should not be used. The size of the processed bricks: the capping bricks under the rotary kiln and the supporting brick board should not be less than 70% of the original bricks; in the flat joint bricks and curved bricks, it should not be less than 1/2 of the original bricks. The original brick must be used for locking, and the working surface of the brick is strictly prohibited from processing.
