Rapid baking type tundish dry material and preparation method thereof

Abstract

The invention discloses a rapid baking type tundish dry material and a preparation method thereof. The rapid baking type tundish dry material is prepared from the following raw material components inpercentage by weight: 61-66% of sintered magnesia particles, 17-24% of sintered magnesia fine powder, 5-10% of metal iron powder, 4-5% of a carbon binding agent, and 2-3% of an additive. The preparation method for the rapid baking type tundish dry material comprises the following steps of: (1) pre-mixing the sintered magnesia fine powder, the metal iron powder, the carbon binding agent and the additive in a sand mixer; and (2) adding the sintered magnesia particles to continuously mix. The rapid baking type tundish dry material provided by the invention can remarkably improve heat conduction ability of a dry type material layer, effectively shortens roasting time, reduces dosage of oxide micro powder, and reduces production cost. The method is simple in production cost, is low in cost, islong in product service life and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, in particular to a quick-baking tundish dry material and a preparation method thereof. Background technique [0002] Tundish dry material is a widely used refractory material for working lining of tundish; the masonry tundish is usually required to be quickly baked to 950-1100°C before use in order to increase the temperature of the refractory lining inside the tundish and remove it. If the baking time is too short, the baking effect will not meet the requirements of use; if the baking time is too long, it will easily lead to the deterioration of the performance of functional components such as nozzles and stoppers assembled; The layer thickness of the dry tundish is usually 50-100mm. In order to achieve a good baking effect, the baking time is generally required to be about 2-4 hours; very important. [0003] The current tundish dry material mainly uses magnesia of different grade...

AI Technical Summary

Problems solved by technology

[0002] Tundish dry material is a widely used refractory material for working lining of tundish; the masonry tundish is usually required to be quickly baked to 950-1100°C before use in order to increase the temperature of the refractory lining inside the tundish and remove it. If the baking time is too short, the baking effect will not meet the requirements of use; if the baking time is too long, it will easily lead to the deterioration of the performance of functional components such as nozzles and stoppers assembled; The layer thickness of the dry tundish is usually 50-100mm. In order to achieve a good baking effect, the baking time is generally required to be about 2-4 hours; very important

[0003] The current tundish dry material mainly uses magnesia of different grades and different particle sizes as the main raw material; according to different bonding methods, it can be divided into several types such as carbon bonding, inorganic salt bonding and oxide powder bonding; among them, carbon bonding magnesium Dry-type materials are widely used because of their good high temperature resistance and corrosion resistance; in this type of magnesia-carbon refractory materials, the matrix part mainly composed of binder and magnesia fine powder has poor compactness and bonding strength. Once the carbonaceous material used as the binding phase is lost due to oxidation and other reasons, the magnesia fine powder in the matrix material is difficult to sinter effectively at a lower temperature, which will easily cause the magnesia fine powder to fall off under the scouring of the molten pool, affecting the refractoriness Material service life; In order to solve this problem, document 1 (publication number CN101423417A) provides a kind of low-carbon magnesia-carbon brick containing metallic iron, and document 2 (publication number CN103387396A) provides a kind of vanadium extracting converter containing metallic iron Magnesia-carbon bricks, these two patents are added to magnesia-carbon refractory products in the form of metallic iron, using the volume expansion effect produced by the oxidation of metallic iron to improve the compactness of the decarburized layer and improve the bonding of the matrix part of the decarburized layer strength, improve the erosion resistance and service life of the decarburized layer; but for the tundish dry material, as an amorphous refractory material, its density is worse than the above two refractory products, and the tundish dry material is baked The temperature is lower than the service temperature of the above two refractory products, so good baking performance is solve The key to fast roasting of tundish dry material