Anti-erosion magnesia-carbon bricks and preparation method therefor

Abstract

The invention discloses anti-erosion magnesia-carbon bricks. The magnesia-carbon bricks are prepared from the following ingredients in parts by weight: 65-70 parts of magnesia, 3-5 parts of basalt granules, 0.25-0.5 part of nano zirconium boride, 1-3 parts of nickel citrate, 1-3 parts of copper sulfate pentahydrate, 0.3-0.5 part of hexamethylene tetramine, 15-18 parts of graphite, 3-5 parts of ceramic granules Al4SiC4 and 3-5 parts of binder. According to the anti-erosion magnesia-carbon bricks, the proportioning of the magnesia-carbon bricks is subjected to optimization and improvement, particularly, the basalt granules, the nano zirconium boride, the nickel citrate, the copper sulfate pentahydrate and the ceramic granules Al4SiC4 are added, and all the ingredients are synergistic mutually, so that the quality of the bricks is high, the carbon loss can be greatly lowered, the spalling of the bricks is avoided, the slag erosion resistance of the magnesia-carbon bricks is improved obviously, and the service lives of the magnesia-carbon bricks are prolonged. The invention further discloses a preparation method for the anti-erosion magnesia-carbon bricks. The preparation method is simple in processing steps and high in operability, has low requirements on equipment and is applicable to large-batch industrial production.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to an anti-corrosion magnesia carbon brick. Background technique [0002] Magnesia carbon brick is a high-quality refractory material, which is widely used in electric furnaces, converters and refining furnaces. With the continuous development of the iron and steel industry, the requirements for the performance of magnesia-carbon bricks are getting higher and higher, and the oxidation of carbon in magnesia-carbon bricks seriously affects its service life and restricts its development. Therefore, improving its oxidation resistance is of great significance to improving the performance and quality of magnesia carbon bricks and the development of magnesia carbon brick industry. [0003] In order to improve the oxidation resistance of magnesia carbon bricks under high temperature conditions, the key is to control the decarburization speed of the material. A commonly used m...

AI Technical Summary

Problems solved by technology

Add micropowder additives (any one or more of high-temperature asphalt powder, alumina micropowder, metal aluminum powder, metal silicon powder, metal magnesium powder, boron nitride powder, silicon carbide powder) to the magnesia carbon brick to increase the magnesium The oxidation resistance of carbon bricks at high temperatures has the following shortcomings: (1) Metal micropowder (such as metal aluminum powder, metal silicon powder, etc.) is prone to oxidation, and impurities in oxidized metals and magnesia and graphite are prone to adverse reactions. The reaction will act as a flux during oxidation. As we all know, in fired magnesia bricks, alumina and silicate minerals with a high calcium-silicon ratio can react to form a liquid phase, which will have a significant impact on refractoriness. In molten steel Under the erosion of , slag and gas, it is easy to reduce the service life of the product; in addition, during the production process of the magnesia carbon brick, the added metal powder will cause the thermal expansion of the magnesia carbon brick to be too high, resulting in high stress, resulting in magnesium carbon bricks. Carbon bricks are very easy to crack; the addition of non-metallic powder (such as boron nitride powder, silicon carbide powder, etc.) will affect the slag resistance of magnesia carbon bricks; (2) in the preparation process of magnesia carbon bricks, it is easy to produce layer (3) Poor resistance to slag erosion and short service life