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標題: CaO-Al2O3-SiO2-MgO-CaF2脫硫劑之物化性研究
The study of physical and chemical properties of CaO-Al2O3-SiO2-MgO-CaF2 slags
作者: 林坤賢
Kun-Hsien Lin
關鍵字: 無;no
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The desulfurization reactions in steel making are associated with basicity, melting point, viscosity. In this study, design six groups (A-F) with a low melting point,different basicity, and different composition phase. In order to make a comparison, three control groups which are similar to steelworks slag waste (A1-A3) were designed. The three control groups are content 10% CaF2. By identify the physical and chemical properties of these groups, to discuss the impact of the desulfurization reaction.
In this experiment, using the frequency induction furnace to pre-melting the nine groups, simulating the patterns after the high-temperature reaction of nine groups. After
pre-melting, conducted a series of experiments as viscosity, F-CaO, XRD, XRF, DTA,Raman. Simulate the sulfur distribution ratio and desulfurization rate by using Thermo-Calc software.
In the results and discussions, it is confirm the pre-melting is success by XRD and XRF. In F-CaO testing, the group of Al-killed steel has higher F-CaO. The content of
F-CaO increase when the percent of Al2O3 increase. The melting point of the six groups are about 1470-1510°C, the three control groups are about 1400°C. The viscosity of Si-killed steel is higher, because of higher SiO2 content. But, when the CaF2 is add, it will break the cross-linked network of SiO2 and Al2O3 and reduce the viscosity. As the SiO2 decrease, the group of Al-killed steel has lower viscosity.
After the thermodynamic simulation, The group E has the best desulfurization rate and Ls of six testing groups. The group E has the best efficiency (desulfurization rate:
56%), because it has high value of Cs, enough F-CaO, low viscosity. The efficiency is closest to control group. High optical basicity has good properties, such as low viscosity,high F-CaO, Ls and desulfurization rate. It is helpful for desulfurization.

本研究利用週波爐加熱脫硫劑配方模擬經過高溫熔融後脫硫劑的狀態,並進一步利用熱力學模擬軟體進行脫硫反應的模擬 不同成份的脫硫劑有不同的鹼度、熔點、黏度、F-CaO,本研究設計出六組(A-F)具有低熔點、不同鹼度、不同組成相的六組配方進行試驗,並設計三組(A1-A3)與鋼廠爐渣成分相近的對照組,探討物化性對於脫硫反應的影響。
本實驗利用週波爐進行配方預熔的動作,模擬配方在高溫反應後的型態,利用 XRF 及 XRD 鑑定配方預熔的成分及組成相是否準確,並運用濕式分析各組配方的 F-CaO,DTA 量測脫硫劑的熔點,利用 DVⅢRV type 的高溫黏度計進行黏度量測以及使用 Raman 光譜進行黏度的佐證,一連串的物化性分析後,進一步利用Therma-Calc 熱力學模擬軟體進行模擬,藉由參數的設定可以得知在熔煉溫度為1600°C 時熔渣與鋼液的成分比例,進一步得知配方的脫硫率及 Ls 值。
實驗結果發現在九組配方中,由 XRD 及 XRF 鑑定確認配方預熔成功,後續進行物化性的分析,發現 F-CaO 的含量為鋁脫氧鋼的配方含量最多,進一步了解到 F-CaO 的量隨著氧化鋁增加而增加 而在熔點 A-F 六組配方大約落在 1470-1510°C,添加氟化鈣的對照組熔點約在 1400°C。在矽脫氧鋼的組別因氧化矽的含量高導致有高的黏度值,但在加入氟化鈣後,因斷除氧化矽的交聯結構,使黏度值下降,而在鋁脫氧鋼的組別,因氧化矽的含量減少而有較低的黏度,由模擬得知在適當的黏度值、熔點,F-CaO 下,E 組的脫硫率及 Ls 值最好,最接近添加氟化鈣
的對照組,為最有潛力加以修改運用在煉鋼製程中,並且藉由對照組的比對,得到一個評估脫硫劑好壞的公式 當脫硫劑擁有高的 Cs 值 並且滿足有適當的 F-CaO,餐與反應、熔點低於 1600°C、低黏度值低於,便能判定此配方為好的脫硫劑,藉由此方式可以初步評估設計的脫硫劑的可行性。由光學鹽基度能得知,高的光學鹽基度能有低黏度、高 F-CaO、高脫硫率及 Ls 等對脫硫有幫助的特性。
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