Pouring material for producing high-temperature ceramic abrasion-proof lining body

Abstract

The invention relates to a castable for preparing a high-temperature ceramic wear-resistant lining, which contains 10-25% of fused mullite with a particle size of 3-5mm, and 20-45% of fused mullite with a particle size of 1-3mm. 3-7% of andalusite with a particle size of 0.1mm-1mm, 8-25% of platy corundum with a particle size of 0.1-1mm, 5-20% of fused white corundum with a particle size of 0.1-1mm, 5-20% of fused white corundum, and pure calcium aluminate with a particle size of <0.074mm 2-10% of cement, 2-6% of silicon micropowder, and 2-10% of alumina micropowder. The castable can be applied to the intersection of blast furnace hot air pipe and air supply branch pipe, etc. where thermal shock stability is high. The lining made of it has good thermal stability, high temperature air erosion resistance, good thermal shock resistance, It has the advantages of long life cycle, simple manufacturing method, short construction period, environmental protection and pollution-free, low cost, and easy industrial production.

Description

technical field [0001] The invention relates to a casting material, in particular to a casting material for preparing a high-temperature ceramic wear-resistant lining. Background technique [0002] In the smelting industry, the intersection of the blast furnace hot air pipe and the air supply branch pipe carries the task of conveying high-temperature and high-pressure gas, and is a key part that needs to be protected. The protective lining at the intersection of the traditional blast furnace hot blast pipe and air supply pipe is mostly built with high alumina bricks, and the joints are smeared with mud (Liu Quanxing. Review and Prospect of the New Technology Application of Blast Furnace Hot Blast Stove in my country, "Shandong Metallurgy", 2007 Year 01 issue). During the production process, the hot air passing through the intersection has the characteristics of large temperature fluctuation range (local temperature difference can reach 900-1200°C), high flow rate (generally ...

AI Technical Summary

Problems solved by technology

During the production process, the hot air passing through the intersection has the characteristics of large temperature fluctuation range (local temperature difference can reach 900-1200°C), high flow rate (generally up to 100m / s), and it contains a large amount of hard smoke, which is easy to clean. The mud bonded at the brick joints produces a strong erosion effect, causing the mud to fall off, resulting in air leakage, which in turn leads to a sharp increase in the temperature of the external steel plate wall; the high-energy smoke and dust will also have a strong erosion on the high-alumina bricks It is very easy to produce scratches and chemical corrosion on the surface of the brick body, resulting in roughness and embrittlement of the surface, which further aggravates the erosion and peeling of the lining, and the severe temperature fluctuation of the flue gas will lead to high aluminum with low thermal conductivity A huge temperature gradient is formed inside the brick, forming a high thermal stress. The high thermal stress induces cracks in the brick body, and then peels off or falls off. The temperature of the outer wall of the pipe rises, the pressure bearing capacity decreases, and even the accident of pipe burn-through and air leakage occurs

It can be seen from this that the traditional lining body used at the intersection of the blast furnace hot air pipe and the air supply branch pipe is not only prone to runaway redness, but also causes frequent shutdown and maintenance of the blast furnace, so that the production cost remains high , and there are serious security risks