A kind of non-fired magnesia-chrome brick for metallurgy and non-ferrous smelting furnace and its preparation method

Abstract

The invention belongs to the technical field of high-grade refractories for metallurgy and nonferrous smelting furnaces and their preparation, and in particular relates to an unfired magnesia-chrome brick for metallurgy and nonferrous smelting furnaces. An unfired magnesia-chrome brick for metallurgy and non-ferrous smelting furnaces, including aggregate, powder and binder, the raw materials of the aggregate are composed as follows in parts by weight: high-purity magnesia (MgO≥97.5%, particle size 7- 90 mesh) 35‑45 parts, fused magnesia chrome sand (MgO≥69%, Cr 2 o 3 ≥20%, particle size 7-90 mesh) 15-25 parts; the raw materials of the powder are composed as follows in parts by weight: ferrochrome concentrate (Cr 2 o 3 The content is 47%‑60%, Fe 2 o 3 content of 15%-27%, MgO content of 9.0%-13%, particle size 300-350 mesh) 30-35 parts, cold sintering agent (particle size nanoscale) 2-4 parts, rare earth oxide (particle size 2000-3500 mesh ) 0.3-0.6 parts, activated alumina micropowder (particle size 2000-3500 mesh) 2-4 parts; binder 2-5 parts, water 1-3 parts. The invention has the advantages of high purity, high density, high strength, good high-temperature thermal shock stability, strong corrosion resistance, strong resistance to molten metal and oxidation, no need for high-temperature firing, low cost, energy saving and emission reduction, and safe preparation.

Description

Technical field[0001]The invention belongs to the technical field of advanced refractory materials for metallurgy and non-ferrous smelting furnaces and their preparation technology, and specifically relates to an unburned magnesia chrome brick for metallurgy and non-ferrous smelting furnaces.Background technique[0002]Magnesia chrome bricks are refractory products with magnesium oxide (MgO) and chromium oxide (Cr2O3) as the main components, and periclase and chromite spinel as the main mineral components. This kind of brick has high refractoriness, high high temperature strength, strong resistance to alkaline slag erosion, excellent thermal stability, and certain adaptability to acid slag. Magnesium chromium refractories are still the key basic material irreplaceable in global steel refining and non-ferrous metallurgy.[0003]With the advancement of science and technology, the requirements for refractory materials in the industry are getting higher and higher. The performance of the ex...

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Problems solved by technology

[0003] With the advancement of science and technology, the requirements for refractory materials in industry are getting higher and higher. The performance of existing magnesia-chrome brick refractory materials cannot meet the performance requirements of refractory materials in industry. There are short life of furnaces and large economic losses. question

At present, the magnesia-chrome bricks sold on the market usually adopt the traditional high-temperature sintering preparation process. Under the requirements of the country to use clean energy, natural gas is usually used to provide heat energy, which is costly and has safety hazards such as natural gas explosions. For example: Xindeyuan Henan Refractory The magnesia-chrome bricks (models Mge-8A, Mge-12A) produced by the material factory and the magnesia-chrome bricks (models DYMGe-16, DYMGe-18) produced by Zhengzhou Dongyang Refractory Plant have low compressive strength and thermal shock stability.

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