A kind of low-carbon magnesium carbonaceous refractory material and preparation method thereof

Abstract

The invention specifically relates to a low-carbon magnesium carbonaceous refractory material and a preparation method thereof. The technical solution is: 65~70wt% fused magnesia particles, 15~20wt% fused magnesia fine powder, 5~15wt% nanocrystalline spinel-carbon composite powder, 0~5wt% Flake graphite, 1~3wt% metal aluminum powder, 0~3wt% Al-Mg alloy and 0~3wt% crystalline silicon powder are mixed as raw materials, and 3~5wt% phenolic resin is added as the raw material, and mixed and milled at high speed Mixed in the machine, pressed into shape with a 6300KN brick press; dried naturally for 24 hours, then dried at 200-230°C for 24 hours to obtain a low-carbon magnesia-carbon refractory containing nanocrystalline spinel-carbon composite powder Material. The carbon content of the low-carbon magnesia carbonaceous refractory material prepared by the invention is 3-6wt%, and has uniform matrix structure, good oxidation resistance, high temperature strength, excellent resistance to slag penetration, high resistance to spalling and slag corrosion resistance strong features.

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.