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題名 | 爐渣中金屬球電磁感應加熱之應力分佈模擬研究=Thermal Stress Distribution in a Matallic Ball in Slag Media after Magnetic Induction Heating |
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作者 | 劉慧玲; 謝宗憲; 溫紹炳; 王建力; | 書刊名 | 鑛冶 |
卷期 | 43:3=167 1999.09[民88.09] |
頁次 | 頁105-111 |
分類號 | 454.86 |
關鍵詞 | 爐渣; 單離; 磁感應; Slag; Liberation; Magnetic induction; |
語文 | 中文(Chinese) |
中文摘要 | 在不�袗�電爐煉鋼過程中,所產的爐渣,可回收再利用的資源物質有不�袗�金屬 球及渣料,單離的金屬球可利用物理分選、回收並供回爐使用,其餘非磁性部分之渣料可做 為水泥骨材使用。因此,資源化粉碎程序希望能有較高金屬球的單離比率及回收率,以及較 粗渣料的非磁性物做為水泥骨材使用。由電磁感應加熱爐渣中金屬球可以促進金屬球單離程 度,但其原因尚未完全釐清。 本研究擬對爐渣中的金屬球由電磁感應所生之渦電流受熱後,產生熱應力的分佈狀況, 在簡單化的條件下,用球座標系統之應力、應變平衡方程式,以數學解析模擬求得應力分佈 。根據這些解析結果得知:在爐渣與金屬球的接觸面會產生最大的切向正應力,若爐渣的切 向正應力大於本身的抗張強度,則會產生界面破裂情形,是粉碎時促進金屬球單離的主要因 素。此分析結果可以印證爐渣在受電磁感應加熱後能增加金屬球單離程度的現象。 |
英文摘要 | The metallic grains in the slag of electric arc furnace in a steel making plant is valuable materials to be recovered from recycling of slag. The nonmetallic tailing is useful as concrete aggregates. Therefore, a comminution process that gives both coarse size product and high degree of metal liberation will be necessary. This condition can be matched by an induction heating treatment of slag begore comminution to enhance the liberation of metallic grains in coarse crushed product. This paper offers a theoretical analysis on the thermal stress distribution after magnetic induction heating of a metallic ball in slag matrix using mathematics analytical equations. According to the computational results, the maximum shearing stress is distributed on the surface between metallic grains and nonmetallic matrix. If the maximum shearing stress should larger than the tensile strength of slag, the treatment would induce the interfacial fracture in the boundaries. That is the main reason for enhancing liheration during the comminuting operation. |
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