文章信息/Info

Title:

Lightweight alumina-magnesia refractory for refining ladle and its slag corrosion behavior

作者:

 黃 奧; 顧華志*; 付綠平; 連朋飛; 張美杰; 羅志安

省部共建耐火材料與冶金國家重點實驗室，武漢科技大學

Author(s):

 HUANG Ao;  GU Huazhi;  FU Lvping;  LIAN pengfei;  ZHANG Meijie;  LUO Zhian

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei

關鍵詞:

精煉鋼包; 輕量化耐火材料; 微孔剛玉; 渣蝕行為; 數值模擬

Keywords:

Refining ladle;  lightweight refractory;  microporous alumina;  slag corrosion behavior;  numerical simulation

DOI:

10.7502/j.issn.1674-3962.2017.06.05

文獻標志碼:

A

摘要:

耐火材料輕量化是其重要發展方向之一，研發合適的多孔骨料取代致密材料且確保服役安全與壽命是一條重要途徑。大型工業爐工作襯處于高溫苛刻環境，其渣蝕致損是關鍵，不僅與鋼渣運動有關，也受材料微結構的影響，僅憑單一實驗手段難以探明。本文以精煉鋼包鋁鎂系耐火材料為對象，研制了性能指標參數優異的輕量微孔剛玉骨料及其輕量鋁鎂系耐火材料，無論是靜態還是動態渣蝕實驗，輕量鋁鎂系耐火材料均表現出不亞于普通鋁鎂系耐火材料的抗渣性能。同時，根據自制多孔骨料性能參數，采用隨機骨料-基質二元結構模型描述耐火材料微結構差異，構建其渣蝕過程的溫度、流動、反應等多場耦合數學模型，利用數值模擬方法，探索不同條件下精煉鋼包輕量化耐火材料的渣蝕特性，明確了多孔骨料的關鍵參數及輕量化鋁鎂系耐火材料的抗渣蝕機理，可為設計和開發長壽輕量化耐火材料提供理論指導，能促進精煉鋼包等高溫窯爐的節能降耗。

Abstract:

  The lightweight refractory with micro-porous aggregates is of importance for energy-saving and consumption reducing in high temperature industries, and the slag corrosion resistance is significantly concerning its service life. Large industrial furnace lining is in high temperature and harsh environment, its corrosion damage is related not only to steel slag movement, but also the microstructure of materials, and hard to ascertain by experiments only. Based on Al2O3-MgO refractory for refining ladle, the lightweight microporous alumina aggregates and lightweight Al2O3-MgO refractories with excellent performance parameters have been developed, and they showed same slag resistance as the ordinary refractories in the static and dynamic corrosion experiments. Meanwhile, according to the properties of porous aggregates, a geometry model of random aggregate-matrix, in which aggregates and matrix were described with different microstructures based on porous medium theory, was adopted. And a micro-CFD (Computational Fluid Dynamics), temperature and reaction coupled model was established to describe the slag corrosion process. The characteristics of the slag corrosion on the lightweight refractories were initially investigated by mathematical simulation, and the suitable microstructure parameters and corrosion resistance mechanism of lightweight Al2O3-MgO refractories for ladle lining was discussed. The simulation results agree well with that of the experiments, which means the above model is promising for slag corrosion modeling. The key target for lightweight refractories design is the average pore size and the lightweight lining for refining ladle is feasible. It can provide a theoretical basis for design and development of lightweight refractory materials, and promote the energy-saving of high-temperature furnaces.