Green low-creep MgO-C brick and preparation method thereof

Abstract

The invention relates to a green low-creep MgO-C brick and a preparation method thereof. The technical scheme of the preparation method comprises the steps: performing batching on fused magnesia finepowder, titanium diboride fine powder and triethanolamine at a mass ratio of 100:(2-4):(4-6), performing even mixing at 130-135 DEG C in a vertical heating mixer so as to obtain a mixed fine powder material, performing batching on fused magnesia particles, the mixed fine powder powder, flake graphite and boric anhydride at a mass ratio of 100:(40-45):(3-6):(2-3), performing even mixing at 140-150DEG C in the vertical heating mixer so as to obtain a premix, adding glycerin with an amount of 4-5% of the weight of the premix and liquid paraffin with an amount of 2-3% of the weight of the premixto the premix, performing mixing at 160-165 DEG C in the vertical heating mixer so as to obtain a mixed material, performing press forming on the mixed material under 55-65 MPa, and performing heat treatment at 220-250 DEG C for 60-90 minutes so as to obtain the green low-creep MgO-C brick. The process is simple and environmentally friendly, the prepared product has a good environmental protectioneffect, low creep at high temperature, hydration resistance and high resistance to slag corrosion.

Description

technical field [0001] The invention belongs to the technical field of MgO-C bricks. Specifically relates to a green low-creep MgO-C brick and a preparation method thereof. Background technique [0002] MgO-C brick is a non-burning carbon composite refractory material made of high melting point MgO and carbon materials, adding non-oxide additives, and combining carbon binders. It can be widely used in converters and electric furnace linings and ladles. Slag lines and other parts. [0003] With the development and continuous development of MgO-C bricks, its high-temperature service performance has attracted more and more attention, and the requirements for functionalization and longevity are getting higher and higher: [0004] (1) At present, the C content in MgO-C bricks is about 10-20%, but during the service process, the C in MgO-C bricks is eroded by molten steel to cause carburization of molten steel (Zhu Boquan, et al. "Research on low-carbon magnesia-carbon bricks C...

AI Technical Summary

Problems solved by technology

The existing technical means mainly introduce or form nano-carbon sources (such as carbon nanotubes) in situ to improve the dispersion of carbon sources, thereby slowing down the weakening of the high-temperature performance of MgO-C bricks, but the process is complicated, which significantly improves the preparation time. cost

[0005] (2) The existing technology shows that the main raw materials (magnesia and carbon materials) used in the preparation of MgO-C bricks have no significant negative impact on the environment, but the binders used (mainly phenolic resin, high-temperature asphalt or tar etc.) is not only related to the bonding performance of MgO-C bricks, but also has a significant impact on the environment

At present, the main technical means to improve the hydration resistance of MgO-C bricks is to coat the binder to isolate the outside air, but the binder itself (such as resin) still contains a small amount of water, which will inevitably lead to hydration of MgO-C bricks.