Unfired magnesite-chrome bricks used for metallurgical non-ferrous smelting furnaces, and preparation method thereof
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A technology for smelting furnaces and magnesia-chrome bricks, which is applied in non-fired magnesia-chrome bricks for non-ferrous smelting furnaces, and in the field of metallurgy, which can solve the problems of failure to meet the performance requirements of refractory materials, low compressive strength and thermal shock stability, and short furnace life and other problems, to achieve the effect of ideal bonding strength, good load softening temperature, and prolonging the life of the furnace
Active Publication Date: 2017-08-15
孙光 +1
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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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Embodiment 1
[0037] The raw materials were weighed according to the components specified in Table 1 below, and the preparation method was as follows.
[0038] A method for preparing unfired magnesia-chrome bricks for metallurgical and non-ferrous smelting furnaces, the steps are as follows:
[0039] (1) Weigh high-purity magnesia and fused magnesia-chrome sand according to parts by weight, put them into a crusher for crushing, and then add them to a ball mill for crushing, and then use a vibrating screen to screen out the particle size to a particle size of 7-90 purpose aggregate;
[0040] (2) Weigh ferrochrome concentrate, cold sintering agent, rare earth oxide and activated alumina micropowder according to parts by weight, put them into a container and mix them to form a powder.
[0041] (3) Mixing: Put the prepared aggregate into the mud mixer, add vitrified binder, the rotation speed is 40-60r / min, and the stirring time is 10-20 minutes. When stirring, add water until the vitrified bi...
Embodiment 2
[0046] The method of Example 1 was repeated according to the content of each component specified in Table 1 below, and the test results are listed in Table 5.
Embodiment 3
[0048] The method of Example 1 was repeated according to the content of each component specified in Table 1 below, and the test results are listed in Table 5.
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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...
Claims
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