Low-carbon magnesia carbon refractory and preparation method thereof

Abstract

The invention discloses a low-carbon magnesia carbon refractory and a preparation method thereof. The technical scheme of the invention comprises the steps of mixing 65-70wt% of fused magnesia particles, 15-20wt% of fused magnesia fine-powder, 5-15wt% of nanocrystalline spinel-carbon composite powder, 0-5wt% of crystalline flake graphite, 1-3wt% of metal aluminum powder, 0-3wt% of Al-Mg alloy and 0-3wt% of crystalline silicon powder as raw materials, adding phenolic resin accounting for 3-5wt% of the raw materials, blending in a high-speed mixing mill, and performing compression moulding by using a brick machine of 6300 KN; naturally drying for 24 hours, and then drying for 24 hours at the temperature of 200-230 DEG C, so that a nanocrystalline spinel-carbon composite powder containing low-carbon magnesia carbon refractory is obtained. The carbon content of the low-carbon magnesia carbon refractory prepared according to the invention is 3-6wt%, and the prepared low-carbon magnesia carbon refractory has the characteristics of uniform matrix structure, good antioxidant effect, high temperature strength, good slag penetration resistance, good stripping resistance and strong slag resistance.

Description

technical field [0001] The invention belongs to the technical field of magnesia-carbon refractories. In particular, it relates to a low-carbon magnesium carbonaceous refractory material and a preparation method thereof. Background technique [0002] Magnesia-carbon refractories were gradually developed in the 1970s by adding graphite to magnesia refractories. The carbon (graphite) content in traditional magnesia-carbon refractories is generally 10-20%. Due to the high thermal conductivity of graphite and the characteristics of not being infiltrated by slag, the slag corrosion resistance and spalling resistance of refractory materials are greatly improved. For more than 30 years, magnesia-carbon refractories have been widely used in steelmaking converters, electric furnaces, refining furnace linings, and ladle slag lines. [0003] With the rapid development of smelting technology, the requirements for the use of refractory materials are also getting higher and higher. Cle...

AI Technical Summary

Problems solved by technology

This is because nanoparticles have strong volume effects, surface interface effects, etc., coupled with the effects of van der Waals force, electrostatic force, and surface tension of solvents between particles, nanoparticles usually have serious agglomeration, and traditional mechanical mixing methods It is difficult to destroy this reunion structure

The existence of this agglomeration structure will cause the inhomogeneity of the matrix part of the magnesia-carbon refractory material, which will affect the performance of the material.