Cement-free iron runner castable

Abstract

The invention relates to a cement-free iron runner castable including, by weight, 33-45 parts of brown corundum, 13-23 parts of white corundum, 10-20 parts of SiC, 10-15 parts of alumina powder, 4-12parts of SiC-SiAlON powder, 1-2 parts of calcium carbide powder, 3-5 parts of Siox X-Zero powder and 0.15-0.2 parts of explosive-proofing fibers. The castable has good high temperature mechanical strength and strong anti-slag scouring performance, is good in breathability and can achieve rapid constructure of an iron runner.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a cementless iron ditch castable. Background technique [0002] Due to the influence of the discontinuity of tapping, the refractory material is subject to thermal shocks of hot and cold, coupled with the erosion of molten iron itself and the erosion of slag iron, so it must have strong thermal shock stability, slag iron Scourability, oxidation resistance and high high temperature strength, good fluidity and high anti-burst temperature are also required during construction and baking. At present, most iron trench materials generally use cement-bonded Al 2 o 3 – SiC-C castables, such as Chinese patents with patent numbers ZL201510521340.3 and ZL201010185737.7, and Chinese patent applications with application number 201611150299.4. The combination of cement for this type of iron trench castable can easily cause CaO and material systems introduced in cemen...

AI Technical Summary

Problems solved by technology

At present, most iron trench materials generally use cement-bonded Al 2 o 3 – SiC-C castables, such as Chinese patents with patent numbers ZL201510521340.3 and ZL201010185737.7, and Chinese patent applications with application number 201611150299.4. The combination of cement for this type of iron trench castable can easily cause CaO and material systems introduced in cement Middle Al 2 o 3 and SiO 2 It reacts at high temperature to produce a low-melting point phase. Although the existence of the low-melting point phase can promote the sintering performance of the material, it seriously endangers the high-temperature strength of the iron trench castable and the erosion resistance of slag iron, resulting in a shortened service life. Greatly shortened, usually the one-time ironing volume is only about 150,000 tons

The Chinese patent application and document "Research and Development of Cementless Trough Castable" (Journal of Shandong University of Technology, Natural Science Edition, Vol. 26, No. 4, 76-80) with application number 201611150300.3 discloses a blast furnace iron casting The cementless iron trench castable and its preparation method adopt the technical scheme mainly relying on the hydration of alumina to produce gel bonding, but the temperature at which the hydrate loses water is relatively concentrated, and it is easy to burst during the baking process after construction, which is difficult to meet The requirement of rapid construction in the process of repairing the iron ditch limits its application to a certain extent

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