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Second, the construction template can be made of steel or hardwood (bamboo). The template must have sufficient strength, good rigidity, no shape, no displacement, no leakage of pulp. Use mold remover for steel template and waterproof paint for wood template. Recycled boards should be cleaned before use.
Third, cast material lining construction 3.1 cast material construction 3.1.1 Casting material stirring and stirring time should not be less than 5 minutes. Use a forced stirrer during the operation. When mixing, dry and mix first, and then add 80% solvent. Then, depending on the degree of dryness and wetness and the requirements of the construction site, slowly add the remaining solvent until a suitable working consistency is obtained. Under the premise of ensuring construction performance, the amount of solvent should be less.
Pouring material should be used in the whole bag. Stirred castables must be finished within 30 minutes. In the high temperature and dry operating environment, it is also appropriate to shorten the time. The castable that has been initially set or caked must not be used, nor should it be added with a solvent and mixed.
3.1.2 vibrated casting material poured into the template should be immediately stratified with a vibrator, each layer height is less than 300 mm, vibration spacing of 2500mm is appropriate. Avoid vibrating the anchor when it is vibrating. Do not damage the heat insulation layer. Do not allow the vibration to oscillate and revive in the same position. After the slurry returns to the surface of the casting material, the vibrator should be slowly withdrawn to avoid segregation and voids in the casting material.
The castable after pouring is no longer subject to pressure and shock before solidification.
3.1.3 The pouring amount and expansion joints are to be constructed in blocks when pouring. The area of ​​each pouring area is 1.5m2 (simultaneously with the amount of one stirring). Expansion joints are left as required (generally considered simultaneously when pouring) and must not be missed. The expansion joints in the kiln and the precalcining furnace are arranged in the axial direction of the annular ring, and no less than four passes are made of aluminum silicate fiber wool felt.
3.1.4 Curing and demoulding inspection After the surface of the castable material is dry, necessary maintenance shall be carried out according to the construction maintenance requirements. In particular, the castable material shall be watered regularly to keep the surface wet. After the casting material is finally set, it can be removed and the side mold can continue to be sprinkled and cured. However, the load-bearing template can only be released after the strength reaches 70%.
After the template is dismantled, the casting body should be inspected in time, and the quality problems such as honeycomb, spalling and voids should be promptly handled and repaired. When the problem is serious, the defective part shall be cut away, the anchoring material shall be exposed, and then the homogenous ramming material shall be used to continue the conservation. It is forbidden to cover up the problem with mud.
3.2 Composite lining construction Fire-resistant and heat-insulating composite linings shall be constructed in layers. It is forbidden to use mixed-layer and mixed-slurry construction. Thermal insulation materials (such as calcium silicate board, silicon aluminum plate, asbestos or slag wool, etc.) shall be sprayed with waterproof and moisture-proof material.
Casting refractory construction procedure
I. Pre-construction inspections Pre-construction inspections should be carried out strictly, including the following: 1. Defining the shape and structure of the castable equipment 2. Cleaning the process holes 3. The integrity of the construction equipment, vibrating tools, etc. must be intact The various parts 4. Anchor type, size, layout and welding quality, metal anchor must be done for expansion compensation treatment 5. The surrounding refractory brick insulation layer to do a good job of casting material loss of water (glue) precautions 6. Castable material Packaging and date of manufacture, and pre-test to check for failure 7. Construction quality must reach the quality of drinking water 8. Implementation of the construction process formula 9. When the above-mentioned inspection of the pouring process is not qualified, it shall be processed before passing the construction and expired. Material must not be used.