Unfired magnesite-chrome bricks used for metallurgical non-ferrous smelting furnaces, and preparation method thereof

Abstract

The invention discloses a high-grade refractory material used for metallurgical non-ferrous smelting furnaces, and a preparation method thereof, and more specifically relates to unfired magnesite-chrome bricks used for metallurgical non-ferrous smelting furnaces. The unfired magnesite-chrome bricks comprise a skeletal material, a powder material, and a binding agent; the skeletal material is composed of, by weight, 35 to 45 parts of high purity magnesia (MgO>=97.5%, and particle size ranges from 7 to 90 meshes), and 15 to 25 parts of fused magnesite chrome sinter (MgO>=69%, Cr2O3>=20%, and particle size ranges from 7 to 90 meshes); the powder material is composed of, by weight, 30 to 35 parts of chrome iron ore concentrate (Cr2O3 content ranges from 47 to 60%, Fe2O3 content ranges from 15 to 27%, MgO content ranges from 9.0 to 13%, and particle size ranges from 300 to 350 meshes), 2 to 4 parts of a cold sintering agent (nano-grade particle size), 0.3 to 0.6 part of a rare earth oxide (particle size ranges from 2000 to 3500 meshes), 2 to 4 parts of activated aluminium oxide micropowder (particle size ranges from 2000 to 3500 meshes), 2 to 5 parts of the binding agent, and 1 to 3 parts of water. The high-grade refractory material is high in purity, density, strength, high temperature thermal shock resistance, corrosion resistance, molten metal resistance, and antioxidant ability, and low in cost; no high temperature sinterning is needed; energy conservation and emission reduction are realized; and the unfired magnesite-chrome bricks are safe to prepare.

Description

technical field [0001] 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. Background technique [0002] Magnesia-chrome bricks are refractory products with magnesium oxide (MgO) and chromium oxide (Cr2O3) as the main components, and periclase and chrome-iron spinel as the main mineral components. This type of brick has high refractoriness, high temperature strength, strong corrosion resistance to alkaline slag, excellent thermal stability, and certain adaptability to acid slag. Magnesium-chromium refractory materials are still an irreplaceable key basic material for global steel refining and non-ferrous metallurgy. [0003] With the advancement of science and technology, the requirements for refractory materials in industry are getting higher and higher. The performance of e...

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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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