Environment-friendly anti-oxidation baking-free MgO-C brick and preparation method thereof

Abstract

The invention relates to an environment-friendly anti-oxidation baking-free MgO-C brick and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: mixing and shaping magnesite clinker granules in a mixing machine, and performing screening so as to obtain shaped magnesite clinker granules; mixing glycerinum, boric anhydride and triethanolamine, and performing ultrasonic dispersion under a water bath condition so as to obtain a binding agent; mixing magnesite clinker fine powder, gamma-aluminum oxide fine powder and boric acid so asto obtain a premix; performing thermal treatment on the premix in a muffle furnace in a nitrogen atmosphere at 1600-1800 DEG C, and performing cooling, crushing and grinding so as to obtain a fine powder material; mixing the shaped magnesite clinker granules, the fine powder material, crystalline flake graphite and the binding agent so as to obtain a mixed material; performing mechanical pressingshaping on the mixed material, further putting the mixed material into the muffle furnace, and performing thermal treatment for 30-40 minutes at 220-240 DEG C, so as to obtain the environment-friendly anti-oxidation baking-free MgO-C brick. The preparation method has the characteristics of being simple in process, low in production cost, green and environment-friendly and high in finished productrate, and the prepared environment-friendly anti-oxidation baking-free MgO-C brick is environment-friendly and good in anti-oxidation performance.

Description

technical field [0001] The invention belongs to the technical field of MgO-C bricks. Specifically relates to an environment-friendly anti-oxidation non-burning MgO-C brick and a preparation method thereof. Background technique [0002] Since the development of MgO-C bricks, the advantages of MgO and C have been combined to complement each other, which has significantly improved the thermal shock resistance and melt erosion resistance of the material, and is widely used in iron and steel smelting equipment such as converters, ladles, and VOD furnaces. [0003] At present, MgO-C bricks mainly use magnesia (such as sintered or fused magnesia, etc.) and carbon sources (such as graphite, carbon black, etc.) . However, with the development of iron and steel metallurgical technology, especially the improvement of secondary refining level outside the furnace, the development and service of existing MgO-C bricks have been difficult to meet the overall development requirements of me...

AI Technical Summary

Problems solved by technology

However, with the development of iron and steel metallurgical technology, especially the improvement of secondary refining level outside the furnace, the development and service of existing MgO-C bricks have been difficult to meet the overall development requirements of metallurgical technology:

[0004] (1) The existing MgO-C bricks are difficult to meet the requirements due to their low environmental protection performance. This is because the binders (such as phenolic resin, asphalt and tar, etc.) used in the preparation of MgO-C bricks are polluted and costly

Taking phenolic resin as an example, on the one hand, the preparation process of phenolic resin (made by the catalytic polycondensation reaction of phenol and formaldehyde) is relatively polluted; (such as the use, storage and residue of phenolic resin; the release of toxic and irritating gases during heat treatment, etc.)

However, at present, phenolic resin is still commonly used as a binder in MgO-C bricks, such as "an environmentally friendly magnesia carbon brick and its production method, ZL201510292633.9", but this technology only reduces the environmental impact by reducing the amount of phenolic resin

[0005] (2) The carbon source in the MgO-C brick is inevitably oxidized during the service process, and once the carbon source is oxidized, on the one hand, pores are generated, which intensifies the corrosion of the material; on the other hand, the spalling resistance of the material is significantly reduced, The existing technology mainly uses the addition of antioxidants (such as metal powders, carbides, etc.), such as "A high-utilization anti-oxidation regenerated magnesia-carbon brick and its production method, ZL201610709855.0", so that the antioxidants preferentially oxidize C However, the dispersion and volume effect of antioxidants have become new technical barriers

[0006] (3) The molding and yield of MgO-C bricks also affect its economy