Masonry of the bottom of aluminum electrolytic cells in the smelting industry. After the tank shell inspection is passed, the longitudinal and transverse center lines of the tank are measured and mapped. Determine the reference point for the masonry trench bottom according to the flatness of the trench bottom plate. At this point, use a level to lay out the baseline for each layer of brickwork, and find the center line of the cathode steel rod and window installation according to the requirements of the drawing. Make sure the cathode steel rod is located in the center of the slot shell window U. Draw lines for masonry trough. Asbestos boards, insulation boards, and thermal insulation bricks are dry-laid, while refractory bricks are wet-laid.
Laying of insulation products at the bottom of the trough
The laying of insulation products at the bottom of the trough includes the laying of asbestos boards, insulation boards, and insulation bricks, all of which are dry-laid.
When laying boards and bricks, they should be laid from the horizontal center of the trough to both sides, without laying through seams, and lightly tightened with a wooden hammer. The boards and bricks are cut with a saw, and all gaps in each layer are filled with alumina powder. The gaps around the boards, bricks and troughs are filled with dry anti-seepage materials or refractory particles and compacted. When the insulation board is damaged, it must be reprocessed by sawing, and its specifications must be 2/3 of the design. Local processing of insulation boards is also allowed according to the deformation of the bottom of the trough, but the processing thickness shall not exceed 10mm. When laying each layer of bricks, the seams should be staggered and the gap should be less than 1mm.
Refractory brick masonry at the bottom of the trough
After laying a layer of alumina powder or refractory particles on the surface of the insulation bricks according to the design requirements, use a line board to lay the surface bricks layer by layer, make a long hanging line board, and carve vertical brick lines on its upper surface. When laying bricks, use the line board clamps on the brick layer to be laid, and use the line hammer to hang the lines on the line boards on both sides. In this way, the thickness and longitudinal arrangement of the bricks are controlled, ensuring accurate masonry. Hanging wire at the bottom of masonry trench.
The mortar joint fullness of refractory bricks is greater than 90%, the top joints, side joints and horizontal joints are all built according to the design requirements, and the gaps around the masonry are filled and compacted with refractory particles. After the masonry is completed, clean it up, check it according to the pre-drawn reference line, and measure 9 points on the masonry surface. If problems are found, they should be dealt with until the standards are met. The surface flatness requirement is no more than ±2mm.
Construction of dry anti-seepage material at the bottom of the trench
Before laying dry anti-seepage material on the insulation bricks, first make a special steel template of a certain height according to the compression ratio calculated in advance, and use it in conjunction with a scraper. Generally, dry anti-seepage materials are compacted in two layers. After the first layer of material is added to the calculated height and leveled with a scraper, plastic film and 1mm thick cold-rolled steel plate or plywood are placed on the material. To prevent dust during tamping, use a special reciprocating sand and gravel rammer, tamping about 6,500 times per minute, and tamping is carried out according to the designed route and number of times. After the first layer is completed, check whether the compaction height of the anti-seepage material reaches its compression ratio. If it is qualified, lay the second layer. Use the same method to compact the anti-seepage material to the designed elevation. After compaction is completed, 9 points on the surface of the anti-seepage material are measured and checked according to the pre-drawn reference line. If part of it exceeds the standard, it can be repaired to make the levelness reach ±4mm to ensure the installation size of the cathode carbon block.
Rongsheng refractory material manufacturer can provide refractory lining materials for high-temperature industrial furnaces. Moreover, Rongsheng Manufacturer and professional construction team can provide refractory furnace lining construction services. Contact Rongsheng for more information.