1. Refractory castables for pouring construction should be selected according to local conditions. Different structural parts have different pouring methods. Selecting a reasonable construction method is the key to ensuring quality, construction period and reducing costs.
Preparations before construction
1) The matching test blocks should be prepared, and the construction can only be carried out when the test blocks meet the design requirements;
2) Check the corrosion of the steel shell, and the surface of the steel shell in contact with the castable should be derusted;
3) Check whether the template is supported firmly. The surface of the template should be planed and painted with a layer of varnish to prevent the template from absorbing water and facilitate mold removal. Formwork seams should be tight and of sufficient strength.
2. Pouring of refractory castables
1) When pouring refractory castables for the heat insulation layer, manual tamping should be used to prevent particle separation and increase bulk density. When the thickness is greater than 75mm, it should be poured once to reach the required thickness, otherwise it will be delaminated. Seams should be clean and connected in straight stubble.
2) When pouring refractory castables in the refractory layer, mechanical tamping should be used to achieve the inner solid and the outer flat. Manual tamping should be uniform and compact, but not calendered. Because after calendering, the cement slurry goes up and down, and the surface is relatively dense, so that the internal
Moisture is not easy to evaporate, and cracks are prone to occur. To this end, to prevent the water from evaporating too quickly, it should be covered after construction to keep it moist for maintenance.
3) When pouring the refractory castable at the bottom of the furnace, just use a wooden trowel to pat it firmly, and do not need to calender, otherwise cracks will occur.
4) When pouring refractory castables, whether it is a refractory layer or an insulating brick, measures should be taken when the insulating brick masonry has a contact surface, lining with plastic film or other materials to prevent water absorption and unfavorable isolation.
5) When pouring the refractory castable in the transition section of the corner, when it has a contact surface with the insulation board (brick), a layer of plastic cloth should be laid to isolate it to prevent water absorption. Refractory castables with difficult corners can appropriately increase the amount of water castable furnace bottom, but it should not be too large. Use refractory castables with good fluidity, and the tamping time should not be too long, to prevent particle separation and excessive moisture from going up and down, evaporating moisture and causing cracks.
6) The thickness of the castable refractory is within 50mm. It should be wiped off at one time by the smearing method. During construction, the castable should be filled with the steel wire mesh, and there should be no gaps. When smearing, the castable should be spread out, and then smoothed with a wooden trowel until the surface is rough. In order to prevent cracks, the surface of the castable cannot be calendered with an iron trowel.
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