Cylindrical sillimanite bricks are sillimanite refractory blocks formed as hollow cylinders for use as regenerator checkerwork. Instead of the rectangular flue of a conventional checker brick, the cylindrical form leaves an open vertical core through each brick, so the setting presents a large,...
Cylindrical sillimanite bricks are sillimanite refractory blocks formed as hollow cylinders for use as regenerator checkerwork. Instead of the rectangular flue of a conventional checker brick, the cylindrical form leaves an open vertical core through each brick, so the setting presents a large, regular heat-exchange surface and flues that resist closing up.
They are produced by XZK Group on the same sillimanite bodies used for our pressed bricks, in the Al2O3 57–65% range, and are supplied where regenerator load, thermal cycling and batch dust carry-over are all significant.
Regenerator checkerwork does two jobs: it absorbs heat from the flue gas on one half-cycle and releases it to the combustion air on the next. How well it does that depends on surface area per unit volume and on how freely gas moves through the flues. A hollow cylinder presents more surface for the same brick volume than a solid rectangular form, and the round passage produces a more uniform flow with fewer dead corners where dust can settle.
The material is the sillimanite body described on our sillimanite brick page: a fired mullite-matrix refractory with low creep and good spalling resistance. In the cylindrical form the brick still carries the weight of everything above it, so creep resistance remains the controlling property, but the round section distributes that load evenly and avoids the sharp corners that initiate cracking in rectangular checkers.
Forming is done by pressing or casting to the required bore and wall thickness, then firing to complete mullitisation. Bore diameter, wall thickness, length and end profile are made to the regenerator design, so the brick is a made-to-order item rather than a stock shape.
| Technical Properties | XZK-SL57-P (Pressed) | XZK-SL60-P (Pressed) | XZK-SL65-P (Pressed) | XZK-SL60-C (Cast) |
| Al₂O₃ (%) | ≥ 57.0 | ≥ 60.0 | ≥ 65.0 | ≥ 60.0 |
| Fe₂O₃ (%) | ≤ 1.2 | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 |
| Bulk Density (g/cm³) | ≥ 2.40 | ≥ 2.45 | ≥ 2.50 | ≥ 2.45 |
| Apparent Porosity (%) | ≤ 18 | ≤ 18 | ≤ 17 | ≤ 18 |
| Cold Crushing Strength (MPa) | ≥ 70 | ≥ 70 | ≥ 70 | ≥ 60 |
| Refractoriness Under Load (0.2MPa, ℃) | ≥ 1560 | ≥ 1580 | ≥ 1650 | ≥ 1550 |
| Thermal Shock Resistance (1100℃ water-cooled, cycles) | ≥ 25 | ≥ 20 | ≥ 15 | ≥ 25 |
Test methods follow GB/T and ISO practice; ASTM equivalents and full certificates of analysis are issued with every shipment.
Cylindrical sillimanite bricks are specified from the same four bodies as our pressed sillimanite bricks, so the chemistry and the property balance are shared with the flat product.
Use the 57% body where reversal cycling is the dominant duty and the higher cycle count is worth more than load capacity. Use the 60% or 65% body for the lower courses, where the brick carries the accumulated weight of the setting and where refractoriness under load of up to 1650°C provides the margin. The cast body is used when the cylinder is too large or too complex to press.
Because the cylinder is made to order, selection is a joint exercise: the regenerator design fixes bore, wall thickness and length, and XZK confirms the body grade against the temperature and mechanical load of each course before the setting is drawn.
Cylindrical sillimanite bricks are a regenerator material first and foremost, and their main applications are:
Manufacturing is controlled from raw material through to finished brick. Four automatic batching lines feed 20 CNC presses ranging from 630 to 2000 tonnes, so density is set by press force rather than operator judgement, and firing runs through four 108-metre fully automatic tunnel kilns and five ultra-high-temperature shuttle kilns for a uniform soak.
Every batch is tested for bulk density, apparent porosity, cold crushing strength and refractoriness under load, and ships with a certificate of analysis. XZK Group holds ISO 9001, ISO 14001, ISO 45001 and ISO 50001 certification and operates the Henan Provincial Engineering Technology Research Center for Sintered Refractories for Glass Furnaces.
Cylindrical sillimanite bricks work alongside sillimanite bricks, cylindrical chrome corundum bricks, low porosity fire clay bricks and mullite bricks in a zoned regenerator. See the regenerator refractory bricks range for zoning guidance or browse all refractory products.
Acid Resistance, %:＞99.8;
Bulk Density, g/cm3:2.3-2.4;
Water Absorption, %:≤0.5;
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