- Time:Jul 10, 2022
The construction of the complex parts of the high-temperature furnace equipment can be selected according to the actual situation. If the mold cannot be supported, refractory smears, wear-resistant plastics, etc. can be used. If it cannot be vibrated, wear-resistant self-flowing castables can be used.
Self-flowing refractory castable is the fourth-generation new product of refractory. It is a refractory product developed based on fluid theory, which can be cast and formed without oscillation.
Refractory coating is composed of certain granular grade refractory fine aggregate, powder, adding appropriate binder, admixture (such as gel accelerator, plasticizer, expanded wattle, etc.), mixed with water or other liquid binder use.
Compared to other monolithic refractories, the main differences in coatings are particle ratio, trace additions, deletions and water additions. The amount of water added to the refractory coating can be changed after changing its application method. If spray application increases the amount of water, reduce the amount of water for tamping application.
The properties of refractory spreads depend on the ratio of refractory aggregate to powder, as well as the type of binder. The coating has a certain plasticity, mud, hand coating or mechanical spraying charm, usually requires high strength, good melt or gas corrosion resistance, good coating adhesion, good thermal shock stability, good chemical stability, no cracking , no peeling, etc.
Wear-resistant plastic, refractory mud with certain plasticity is called refractory plastic. Refractory plastics are generally used as clay blanks. During construction, smashing with a hammer will produce plastic deformation without cracking or collapsing. After the functional force is released, the deformed shape can still be maintained. In the United States ASTM, it is stipulated that when the plasticity index tester is used, the deformation index exceeds 15% as mashed material. In China, the deformation index between 15% and 40% is plasticity.
The varieties of refractory plastics are mainly classified according to the binder used and the material of the main material. For example, according to the binder, there are clay-bonded plastics, phosphoric acid-bonded plastics, aluminum sulfate-bonded plastics, tar-asphalt or resin-bonded plastics. Wait. According to the material, it is divided into siliceous, clay, high alumina, corundum, sapphire, carbon-containing fire silicon carbide, magnesium and magnesium-chromium, etc., that is to say, refractory materials of various properties can be made of Corresponding refractory plastics. The most widely used refractory plastics are mainly aluminum silicate (clay and high alumina) plastics.
The self-flowing castable is made by adding composite superfine powder, supplemented by composite high-efficiency admixtures, and selecting the strictest stacking principle, so that the internal potential difference of the data, the molecules are mutually displaced, and relying on their own weight, the self-flowing effect without oscillation is achieved.
Compared with oscillating castables, self-flowing products have the following advantages:
First, the self-flowing castable moves by its own weight, degassing, pushing gently and densifying, improving the working environment and shortening the time of furnace laying;
Second, the on-site self-flow castable is convenient to construct, easy to control the construction quality, and ensure the air tightness and reliability of the heating furnace;
Third, after the construction of the self-flowing castable, the particle distribution is more uniform, the system is good, the quality is uniform, and the service life is long.
Self-flow products are updated products of low-cement and ultra-low-cement pouring materials, especially suitable for various heating furnaces, furnace walls, water-cooled pipe insulation packaging systems, etc. In the near future, the self-flowing pouring material will win wider application with its more convenient construction and more reliable quality.
Self-flowing refractory castables have been paid more and more attention due to their excellent construction properties and physical and chemical properties. Self-flow series products are suitable for construction site chaos, widely used in cement industry, metallurgical industry, non-ferrous metallurgy industry, such as tundish intermediate layer, blast furnace bottom, secondary movement CAS-OB movable cover lining, cast iron tank induction insulation layer, heating furnace, Total heat furnace, rotary kiln cooler, burner, ammonia gasifier, carbon black reactor, civil waste incinerator lining, etc. It can also be used to repair kiln lining data to extend service life.
