Dissertation > Industrial Technology > Chemical Industry > Silicate > The refractory industry > Refractory

Stainless Steel Smelting Refractories of Calcium with Magnesium

Author WangMingGuang
Tutor ShenMingGang
School Liaoning University of Science and Technology
Course Metallurgical Engineering
Keywords stainless steel smelting magnesia refractories anti-hydration high-quality magnesium calcium sand
CLC TQ175.7
Type Master's thesis
Year 2012
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With the development of Building industry and automotive the demand for stainless steel and its quality requirements continue to increase. Therefore, as the smelting of stainless steel refining ladle furnace are also facing new challenges, and its smelting process is becoming more and more harsh , so there are more Requirements for its Refractory of the Performance . In order to adapt to new production requirements, this article uses the traditional refractory properties, especially resistance to slag corrosion and thermal shock stability of the system research and improvement.he main erosion of magnesia brick AOD furnace is the dissolve and penetration of the silicate liquid.The VOD ladle brick with magnesium and calcium in the course of many chemicals and withstand the mechanical forces of erosion, leading to brick cracking, deformation, until the brick off. magnesia refractories is an advanced steelmaking refractories, it has a high temperature, corrosion, thermal stability, good performance and excellent features clean molten steel in the production clean steel, because of the easy hydration of the magnesia refractories ,it is the important problem of the use of it. The results show that when the CaO content in the range of 15.0-25.0% the property of hydration resistance is better .Study and compare the production process of traditional and high-quality magnesium calcium magnesium calcium sand, use heavy oil as fuel , discuss of the influence to the structure and property of Sintering temperature and Hydration processThe results show that only when the sintering temperature above 1830℃, the only preparation of high density, MgO and CaO dispersed, grain growth improved, superior hydration resistance of calcium magnesium sand; Through finely ground raw material, dry pressing, heavy oil as fuel, in 1910℃×8h sintering conditions, the synthesis of high-quality magnesia sand (20wt% CaO). The influence of the content and introduced forms of doloma on the property of MgO-CaO-C brick used for slag-line and ladle wall was studied. The results show that, With the increase content of high-quality doloma, the thermal shock quality of MgO-CaO-C brick used for ladle wall is strengthened, the slag-resistance property decreases first, then increases, but the amplitude is small. Codsidering the the higher requirement of thermal shock quality of ladle wall material, the best addition of high quality doloma is 70 wt%.Contrast test in the steel factory used the new MgO-CaO-C bricks and the conventional MgO-CaO-C bricks shows that, the thermal shock quality and the slag-resistance property of the new MgO-CaO-C brick are far more better than that of the conventional MgO-CaO-C brick, the longevity of the former enhanced with 27.4%.

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