Topower high alumina brick and high alumina refractory Castable For Sale ,Customer In Philippines ordered 30 tons
High alumina bricks are a kind of refractory material made of high alumina bauxite as the main raw materials, through batching, mixing, molding, drying and high-temperature firing. Its main chemical components are alumina (Al₂O₃) and silicon dioxide (SiO₂), and the alumina content is generally above 48%. According to the different alumina content and physical and chemical indicators, it can be divided into different grades.
High alumina refractory castable is mainly composed of high alumina materials and has excellent refractoriness and wear resistance. It is suitable for multiple parts of the boiler lining, especially in high temperature, high pressure and high scouring environments.
High-alumina refractory castables are made of high-alumina bauxite clinker as the main material, high-quality CA-50 aluminate cement as the binder, and combined with a variety of admixtures. They have the advantages of large volume density, high strength, wear resistance, thermal shock resistance, erosion resistance, and high refractoriness. They are a kind of hydraulic refractory material. In order to give full play to their advantages and performance, the construction should be carried out according to the following requirements:
1. Before pouring, the working surface should be cleaned and the surface rust and impurities should be removed. Check whether the anchors are complete and firm. If they are incomplete, they should be filled. If the welding is not firm, it should be welded firmly. Heat-resistant anchors should be used for parts with temperatures above 500℃. The surface of the anchors should be coated with a layer of asphalt with a thickness of 1-2mm or wrapped with plastic film to leave a thermal expansion joint between the metal anchors and the refractory material. The formwork should be supported as required. The formwork must be smooth, tight and firm, and a layer of butter should be applied on the surface of the formwork to facilitate demoulding.
2. This material is a pre-mixed aggregate. No ingredients are required on site. Just add water and stir. The mixing must be mechanically stirred with a forced mixer, and the mixing equipment must be cleaned in advance. It is strictly forbidden to mix with silicate cement, lime, etc.
3. In hot summer weather or high-temperature areas, corresponding cooling measures must be taken to keep the maximum temperature no higher than 30°C. In winter construction, insulation measures must be taken. The minimum construction environment temperature on site must not be lower than +5°C, and the water temperature should be maintained at 15-25°C.
4. When mixing, the amount of material to be added should be determined based on the amount of construction and the capacity of the mixer, and the amount of material added should be determined in units of whole bags. The large bag and the small bags in the large bag should be added at the same time without missing or adding more.
5. The mixing water should be drinking water with a pH of 6-8. The amount of water added is generally 9-11% of the weight of high alumina refractory castable powder. The water temperature should be maintained at 15-25℃. The amount of water used should be strictly controlled and accurately measured. After adding water, stir for 4-6 minutes. Grab a handful of the mixed material with your hand. If it can be held into a ball without cracking or flowing, it can be used out of the machine. Each time the mixed material is used up within 30 minutes, the solidified material cannot be stirred for a second time.
6. When casting, continuous operation must be completed at one time. If the casting area is large, expansion joints should be set according to the design requirements. The casting should be divided into blocks according to the setting of the expansion joints. If it cannot be cast in one time and must be cast in layers, the interval time must not exceed the initial setting time of the bottom layer. The surface of the joint should be roughened to make it tightly bonded.
