Rapid drying casting material for blast furnace iron runner, and preparation method thereof

Abstract

The present invention provides a rapid drying casting material for a blast furnace iron runner, and a preparation method thereof. According to the casting material, bauxite clinker, corundum, silicon carbide powder, corundum powder, and alumina micro-powder are adopted as main materials, a binder and explosion-proof fibers are adopted as auxiliary materials, the bauxite clinker, the corundum and the silicon carbide are subjected to material preparing according to a certain ratio, and added to a mixer to carry out stirring mixing, then the explosion-proof fibers prepared according to a certain ratio are added to the mixer to stir, the corundum powder and the alumina micro-powder are added to mix, the binder is added to mix the powder, uniform mixing is performed, the mixed rapid drying casting material is filled into a moisture-proof package bag, and the bag is sealed and placed in a dry place. Compared with the rapid drying casting material in the prior art, the rapid drying casting material of the present invention has the following advantages that: the preparation method is simple, rapid construction, rapid baking and rapid iron discharging can be achieved, characteristics of good rapid drying explosion-proof performance, good slag iron erosion resistance, and good thermal shock stability are provided, material cost is reduced, the iron runner construction and maintenance time is shortened, the blast furnace utilization coefficient and the yield can be effectively increased, and a service life of the iron runner casting material working layer can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory production, in particular to a quick-drying castable for a blast furnace tapping trough and a preparation method thereof. Background technique [0002] The working lining refractories of the blast furnace tapping trough mostly use various construction forms such as non-baking ramming materials, ordinary castables, and low-cement castables. The baking-free ramming materials are combined with resin or tar, and the ramming time is short. Baking can produce molten iron immediately, but the service life of the ramming material is too short, especially the iron drop point, which generally only takes 3-7 days before it must be repaired, mainly because the rammed groove lining refractory material is generally only a groove lining refractory material. The bottom surface layer is relatively dense, while the surface layer and the side of the ditch are loose and not resistant to erosion. Due to the short s...

AI Technical Summary

Problems solved by technology

[0002]The working lining refractories of the blast furnace tapping trough mostly adopt various construction forms such as non-baking ramming materials, ordinary castables, and low-cement castables. The ramming material is combined with resin or tar, the ramming time is short, no baking is required, and the molten iron can be produced immediately, but the service life of the ramming material is too short, especially the iron drop point, generally only 3-7 days, it must be Repair, mainly because the rammed ditch lining refractory material is generally only a relatively dense layer on the bottom surface of the ditch, while the lower surface and the side of the ditch are loose and not resistant to erosion. Due to the short service life of the ramming material, the iron ditch Repairs are too frequent, the labor intensity of the workers in front of the furnace is too high, and the high-heat environment causes many unsafe factors. It is even more difficult to guarantee the quality of the baking-free ramming material. The performance requirements of refractory materials for working lining are also getting higher and higher. At present, blast furnaces are mostly operated at high temperature and high pressure. The amount of iron tapping increases, and the requirements for refractory materials increase. The method has also been transformed from non-storage type to half-storage type and iron-storage type. The performance of the iron-storage castable is much higher than that of the ramming material, the iron output and service life are greatly increased, and the furnace front is greatly reduced. The labor intensity of the workers has been favored by many steel mills. In order to adapt to and improve the use requirements of the blast furnace tap trough, with the optimization and improvement of the materials used in the tap trough, the construction of the tap trough has been made safer and more convenient. Now large and medium-sized blast furnaces are produced High-quality Al2O3-SiC-C low-cement castables have been widely used in the iron channel, and the amount of iron in a single channel has grown from 50,000 to 100,000 tons to 150,000 tons. According to the investigation and analysis of the blast furnace ironing status and process parameters, it is considered , The construction and repair of the castable working lining of the iron ditch not only has to withstand the erosion of high-temperature slag and iron, the cracks of the pouring body under the rapid cooling and rapid heating environment, and the erosion resistance of the slag and iron flow, but also must improve the rapid construction and rapid baking of the material. Rapid ironing, the quick-drying explosion-proof performance of the material is also critical