A kind of anti-stripping castable at kiln mouth and using method thereof

Abstract

The invention discloses an anti-stripping castable at a kiln mouth and a method for using the same. Aluminum powder, 3-6 parts of calcium ferric aluminate powder, 0.01-0.03 parts of polypropylene fiber, 0.01-0.03 parts of dispersant and 4-6 parts of composite sol; using method: S1. The hot steel and heat-resistant steel are arranged longitudinally and radially, with a distance of 15-20cm and a height of 2 / 3 of the thickness of the casting layer; S2. Coating tar on the surface of the heat-resistant steel; S3. Mold support; S4. Titanoaluminic acid, spodumene, dispersible alumina powder, calcium ferric aluminate powder, polypropylene fiber, dispersant and composite sol are prepared in proportion, mixed and stirred evenly and poured into the mold for casting; S5. Demoulding Conservation, heating and baking, put into use. The invention improves the thermal shock resistance of the castable, avoids the cracking and peeling phenomenon caused by temperature fluctuation, has higher strength and wear resistance, and improves the service life.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a kiln mouth anti-stripping castable and a method for using the same. Background technique [0002] In recent years, the precalciner kiln (PC) and the preheater kiln (SP) in the cement production line have been put into production one after another. The rotation speed of the kiln is increased by 3 to 4 times, the working temperature is high, the heat load is large, the composition of raw materials is easy to change, and the harmful components of alkali metals The amount of evaporation and condensation of substances such as sulfur and chlorine is large, resulting in serious corrosion of the kiln lining. Therefore, the development of cement firing equipment puts forward higher requirements for the variety and quality of refractory materials. The refractory castables for rotary kilns, especially the refractory materials at the front kiln mouth, in addition to the high tempera...

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Problems solved by technology

[0003] The object of the present invention is to provide a kiln mouth anti-stripping castable and its use method, which solves the problem that the refractory material at the front kiln mouth in the prior art needs to withstand rapid cooling, rapid The impact of hot air flow, high-temperature cement clinker wear and high-temperature harmful gas alkali corrosion and other mechanical stress, thermal stress and chemical erosion damage, the service conditions are very harsh, the kiln mouth lining has poor thermal shock resistance, easy to crack and peel off, and the anchors are welded. Connected to the inside of the cylinder, the castables function independently, and there is no effective elastic connection between the anchors, which makes it difficult for the formed kiln mouth lining to form an integral structure attached to the kiln wall. As the kiln diameter increases, As the kiln speed increases, the periodical compression and tension of the kiln mouth intensify, mechanical deformation is likely to occur during the operation of the rotary kiln, and the damage to the radial shear stress of the refractory castable is also greater. As a brittle material, the castable It is easier to crack and peel off, causing problems that the service life cannot be guaranteed

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