A kind of non-fired magnesia-chrome brick for metallurgy and non-ferrous smelting furnace and its preparation method
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A technology for smelting furnaces and magnesia-chrome bricks, which is applied in the field of non-fired magnesia-chrome bricks for non-ferrous smelting furnaces, and in the field of metallurgy, which can solve the problem that the performance cannot 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: 2021-02-05
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]Weigh the raw materials according to the components specified in Table 1 below, and the preparation method is as follows.
[0038]A method for preparing unburned 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 in parts by weight, put them in a crusher for crushing, then add to a ball mill for crushing after crushing, and then use a vibrating screen to sieve out the particle size to 7-90 Purpose aggregate
[0040](2) Weigh chromite concentrate, cold sintering agent, rare earth oxide and activated alumina powder in parts by weight, and put them in a container to mix and configure them to form powder.
[0041](3) Mixing: Put the prepared aggregate into the mud mixer, add the ceramic bond, the rotation speed is 40-60r / min, and the stirring time is 10-20 minutes. When stirring, add water to the ceramic bond to form a slurry package On the surface of the aggregate, add the...
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 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...
Claims
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