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 Wysłany: Pią 11:19, 19 Lis 2010 Temat postu: ugg stiefel AOD furnace brick with high calcium an |
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AOD furnace brick with high calcium and magnesium of calcium
With the increase of CaO content decreased, indicating that high levels of magnesium and calcium CaO brick has better resistance to slag corrosion. Table 4AOD slag by physical and chemical indicators of% the following ternary phase diagram to analyze the slag resistance of magnesia brick invasion situation. Table 4 shows, AOD main components in the slag, Cr20, the high melting point, low solubility in the slag and the chromium slag viscosity, Changcheng agglomeration, it does not consider Cr20, Mgo-CaO refractories for erosion. In addition, MnO basic non-MgO-CaO refractories with the composition of reaction, and AI20,, Mgo, and FeO, the content is low, can be neglected. Therefore, we can put AOD slag erosion of MgO-CaO refractories reduced to C / S (mole ratio) was 1.88 in the CaO-SiO on MgO-CaO refractory erosion, and its research and discussion. Figure 3 shows the CaO-MgO-SiO2 ternary system phase diagram, phase diagram using AOD slag erosion of MgO-CaO materials. As Mgo larger initial crystalline region, adjacent to the compound with Mgo CaO and SiO than in the control subject, and from small to big in order to form M2S (1890 ~ C), CMS (1498 ℃), C3MS2 (1575 ℃),[link widoczny dla zalogowanych], C2S ( 2130 ~ C), C3S (2070 ~ C). These compounds in the CMS, C, MS for the low melting point material is fire-resistant C_O Figure 3CaO-MgO-SiO2 ternary phase diagram of Metallurgy and Energy ENERGYF10RMEI. AI work. URGICALINDUsTRYVo1.28No. 3May. 2009C Figure 4Mgo-CaO-SiO Department of isothermal sections 1600 and harmful products in the mineral. Correspondingly, the same Mgo related to the composition of the triangle are five: ① △ M-MS-CMS (1502 ~), ② AM-CMS-C3MS2 (1498 ℃), ③ AM-C3MS2 a C2S (1575 ℃), ④ AM-C2S -C3S (1790 ℃), ⑤ △ M-C3S-C (1850 ℃) (Figures in brackets for the system began to liquid temperature). AOD slag as C / S is 1.88, so the formation of minerals within the triangle in ③. Triangular temperature of the liquid phase appears ③ 1575 ℃, 1600 ℃ in the test temperature, the slag in the liquid phase have been there. Experiments carried out at a temperature 1600 ~, CaO contents were 40%, 50%, 60% of the MgO-CaO refractories C / S 1.88 of the slag erosion can make use of 1600 ℃ isothermal section diagram analysis. Figure 4 MgO-CaO-SiO system at 1600 ℃ isothermal section diagram, x point of slag composition point (C / S = 1.8 ,[link widoczny dla zalogowanych], A, B, C respectively, CaO content of 40%,[link widoczny dla zalogowanych], 50%, 6o% The MgO-CaO refractories. X points are connected with the A point, B point,[link widoczny dla zalogowanych], c point, computation can be drawn through the lever rule, three CaO contents of MgO-CaO refractories slag reaction at 1600 ℃ and 89%, respectively, 91.11%, and 92. 36% when the liquid phase, the phase formation were 12.92%, 12% and 10.77%. That high calcium and magnesium calcium brick has good resistance to slag corrosion, and with the increase of CaO content increased gradually with the experimental measured results. 2 Conclusion (1) for different CaO contents of magnesium and calcium in terms of bricks, CaO content increases will reduce the room temperature compressive strength, CaO content of 4o% to 50% from little change to 60% of the compressive strength decreases rapidly at room temperature; For the same CaO content in different formulations, the matrix of high purity magnesium powder at room temperature a small amount of the maximum compressive strength. (2) increased with the CaO content, magnesium and calcium to increase thermal shock resistance of brick. (3) CaO content of 40%, 50%, 60% high calcium and magnesium calcium brick has good anti-invasion properties of slag, CaO content is higher, the better resistance to erosion. References [1] Chen Zhaoyou, Tian Shouxin. The relationship between clean steel and refractories [J]. Refractories, 2004,38 (4) :219-225. [2] Zhong Xiangchong. Development of Strategic Thinking magnesia refractory [J]. Ceramic Society, 20o6, 25 (3) :91-95. [3] Liu Jianhui,[link widoczny dla zalogowanych], So the tree red, Tao Shaoping and so on. Ladle Lining calcium magnesium carbon brick with the development and application [J]. Casting, 2oo3, (2) :34-38. [4] Wang Xueyao, Jiang Fan, Liu Changchun. Magnesia refractories Development [J]. Ceramics, 2008, (2) :33-34. Zhao Yan Editor
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