Construction plan and requirements of refractory bricks for cement precalcining kiln
1. Refractory bricks for cement kiln masonry:
Refractory bricks for cement precalcining kiln masonry include: clay bricks, high alumina bricks, corundum bricks, magnesia alumina bricks, silica bricks, magnesia bricks, etc.
2. Masonry of cement kiln refractory bricks:
Wet masonry:
(1) The mortar joint of refractory brick masonry shall use refractory mud with matching material, and the mud shall have a fullness of more than 95%. The width of the brick joint shall meet the requirements of the design drawings (usually 1-2mm).
(2) Aligning the refractory bricks should be hit with a wooden hammer or rubber hammer to ensure that the surface of the refractory brick masonry is completely attached to the shell, and the joints between the bricks should be surface contact surfaces and firmly attached. The refractory mud between the brick gaps should be full and dense.
(3) Staggered joint masonry should be used, the mortar joint should be horizontal and vertical, the arc surface is smooth, and the joints are tight.
(4) The brick slab and flange should not be in direct contact with the refractory bricks, smear refractory mud between them, and reserve expansion joints under the brick slab (the width should be subject to the design drawings).
Lock brick masonry in the arch ring:
(1) When building vaults or round walls, when there are 5-6 bricks left in a circle, dry pre-built refractory bricks and try different brick combinations to meet the tightness requirements. If the requirements cannot be met, the size of the refractory bricks needs to be finely processed, and then the processed bricks are used for dry coding. The combined refractory brick masonry of the processed bricks should be used to ensure that the final space is greater than half of the original brick thickness.
(2) The processing surface of the processed bricks must not face the shell to prevent the refractory bricks from being unable to effectively fit the shell.
(3) The position of the lock bricks should be 2 to 3 bricks away from the processed bricks and not at the top of the arch.
(4) Finally, the bricks should be locked with refractory bricks that have not been processed to ensure the strength of the bricks and reduce the friction when the bricks are wedged.
3. Arch ring refractory brick masonry:
Selection and processing of arch ring refractory bricks:
(1) Brick cutting machine should be used for processing bricks, and the surface of the processed refractory bricks should be smooth, and the processing of edges and corners should be consistent with the original refractory bricks.
(2) The size of the processed brick in the length direction should not be less than 1/2 of the original brick, and the thickness should not be less than 70% of the original brick to maintain the strength of the processed refractory brick. If the size of the processed brick is smaller than this requirement, two processed bricks should be used.
(3) It is strictly forbidden to gouge, beat and strong vibration on the masonry.
Arch ring refractory brick dry masonry construction:
Arch ring refractory bricks built by dry masonry have the same requirements as wet masonry, and they are aligned with adjusting irons. The lock brick should be wedged tightly with a steel plate with a thickness of about 2mm. The lock bricks should be smooth, free of unevenness, burrs, and corrosion. The wedging end of the steel plate should be polished with a grinding wheel to make a wedge angle of less than 6° for wedging.
Note: Only one steel plate can be wedged into a brick joint, and the steel plate cannot be wedged into the brick joint of the lock joint brick.
The reserved space size of expansion joints:
The spacing of reserved expansion joints should be between 1.5 and 2.0 mm. The location of the expansion joint is subject to the requirements of the design drawings. If there is no special requirement, the stressed parts should be avoided.
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