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In the selection and masonry of refractory materials around the aluminum electrolysis cell, at present, many domestic insulation products and heavy and light castables are used for beating, and a layer of refractory bricks is placed on the castable for leveling. Side carbon blocks and silicon carbide bricks are prepared. The main masonry methods for refractory castables, carbon blocks and silicon carbide bricks are as follows:
Construction of side refractory castables
When the long side wall is made of two kinds of castables, the refractory castable on the end side should be poured first. After the long side heat insulation product is finished (close to the tank shell), the long side refractory castable is beaten. . When casting, a special shaped steel formwork should be set up. The proportion of castable and water should be prepared strictly according to the design and manufacturer's requirements. The forced agitator should be used. The agitated castable material is compacted with a plug-in vibrator and vibrated to the surface to expose the floating water. So far, cover the health with a straw bag, and the health time is not less than 24h.
After the castable material is dried, a layer of refractory brick is wetted on the top, and the brickwork should be built by drawing the wire. The quality of the brickwork should ensure that the brick is at a level, the flatness is not more than ±2mm, and the brick joint is less than 3mm. The foundation of the carbon block and the silicon carbide brick is laid.
Masonry of side carbon blocks and side silicon carbide bricks
At present, there are masonry of all carbon blocks or all-carbonized silicon bricks on the side of the electrolyzer, and some of the electrolyzers use carbon blocks for corners and processing blocks, and other parts are masonry of silicon carbide bricks, and some electrolyzers. It is a composite carbon block that uses carbon blocks and silicon carbide bricks. Regardless of the design, it is roughly the same in the masonry method.
The masonry of the side carbon blocks and the side silicon carbide bricks are dry and wet.
Before the masonry, the carbon block is selected according to the shape, and the carbon block with slight damage can be used for the end. The heavier damage can be reserved for the door processing. At the same time, the contact faces of adjacent carbon blocks need to be flattened with a carbon block milling machine to achieve a smooth surface and adjacent surfaces. Further, on the surface where the side carbon block is in contact with the rough paste, the stripe having a depth of 3 to 5 mm can be processed. If the design is a side silicon carbide brick, it cannot be processed. At the time of shipment, the outer dimensions of the brick must conform to the standard specifications.
When building, start with a corner charcoal block. The carbon block should be close to the tank shell, and each piece of carbon block is built, that is, it is fixed on the groove edge by a fixture, and then the adjacent carbon block is built. The door carbon block should be carefully machined and driven from the top. If there is a fixed groove along the plate, the door carbon block is carefully machined and then driven from the side. The position of the carbon block of the door is preferably selected to be the second block near the corner carbon block.
Dry masonry, the vertical joint should be 0.5~1mm; when wet laying, the vertical joint should be 1~1.5mm, and the charcoal mud built by carbon block should be preheated to 60~70°C before use. Apply a layer of charcoal cement to the contact surface of the carbon block. After the carbon block is in place, insert the crowbar into the bottom of the carbon block to make the carbon block move up and down twice. Now force the carbon block to push the carbon block. Until the vertical seam meets the requirements.
In the case of masonry, in order to prevent damage to the carbon block or silicon carbide brick, the hammer is applied with a large wooden hammer to avoid excessively large misalignment. The carbon block should be pre-selected according to the thickness to be thick and thin. The clay should be full.
After the completion of the work, the side carbon block and the shell should be filled with alumina powder. When drying is used, in order to prevent the leakage of the filler, the gap between the carbon blocks should be pre-treated with glue.
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