Blast furnace stemming for repairing and protecting iron notch

Abstract

The invention discloses a blast furnace stemming for repairing and protecting an iron notch, which belongs to the field of refractory materials. According to the invention, the blast furnace stemming comprises the following components in parts by weight: 10-20 parts of corundum, 5-15 parts of homogenizing material, 10-20 parts of coal gangue, 10-25 parts of pyrophyllite, 10-20 parts of composite clay, 10-35 parts of composite powder, 5-20 parts of vanadium-titanium-iron powder, 1-8 parts of silicon nitride iron, 0.1-0.5 parts of wetting agent and 15-22 parts of addition bonding agent, whereinthe composite powder is the mixture of oxide and nonmetal carbide. The blast furnace stemming for repairing and protecting the iron notch, disclosed by the invention, has the advantages of no generation of toxic black smoke, no fractured iron, strong slag resistance, particular suitability for being used in the blast furnace in the later stage and capability of obviously prolonging the service life of the blast furnace; and problems of the traditional stemming, like poor adaptability, large quality fluctuation, short service life, serious pollution and the like, are effectively solved.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a blast furnace clay used for repairing and protecting tapholes. Background technique [0002] In recent years, along with the change and innovation of blast furnace operation technology, the blast furnace has been continuously developed towards larger size and longer life. At the same time, due to the high temperature and high pressure operation, the temperature of the molten iron increases, the amount of iron and the flow rate increase, and the time for tapping is prolonged. The requirements for blast furnace taphole mud are becoming more and more stringent. The main function of gun mud is to block the iron hole and stabilize the tapping. The side wall of the blast furnace near the inner side of the taphole and the lining brick in the hearth area are repeatedly washed and eroded by high-pressure molten iron and slag water during tapping, and become the weak link of the blas...

AI Technical Summary

Problems solved by technology

[0003] Due to the long-term use of the blast furnace, the iron mouth will be severely eroded, and the furnace end will have a bell mouth, resulting in a shallow iron mouth, unstable iron flow, early wind, unclean iron, or even a large flow, which seriously affects the normal iron tapping. Ultimately affect production and safety cannot be guaranteed

Chinese patent CN102234199A discloses a high-titanium furnace clay, which is composed of 75%-85% by weight of titanium concentrate and or rutile, 2-5% clay, 1-3% mica, 10-15% tar and 2~5% asphalt, the use of this gun mud makes the hearth part (especially around the tap hole) basically corrode with other parts synchronously, which can increase the life of the entire blast furnace by one to two years, but the present invention uses a high content of Titanium concentrate and / or rutile are expensive and cumbersome to use. It is necessary to put the gun mud into the front section of the gun mud first, and then install the general gun mud, which is not easy to control. If the operation is careless, the above-mentioned shallow iron mouth and iron Stream instability and other issues

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