爐渣高溫物理性質之快速且簡易評估方法建立

Establishment of a Rapid and Simple Evaluation Method for High-temperature Physical Pproperties of Slag

林啟明(C.M. Lin) ； 樓紹緯(S.W. Lou) ； 張育恩(Y.E. Chang) ； 李佳峻(C.C. Li) ； 吳威德(W. Wu)

《鑛冶：中國鑛冶工程學會會刊》 63卷3期 (2019/09) Pp. 45-57

https://doi.org/10.30069/MM.201909_63(3).05

摘要

煉鋼即是煉渣，因此若要開發出高潔淨度的鋼品則必須先造出優越的渣性。爐渣高溫物理性質在造渣上扮演很重要的角色，但建立一項高溫物理性質量測技術費時且困難，因此若可以建立出精準度高且快速簡易的評估經驗式，則可以方便且有效率地讓電爐鋼廠現場之工程師了解渣性，並造出優良的爐渣而達到減渣量的目的。本研究已建立出爐渣Free-CaO含量、脫磷能力、脫硫能力、高溫黏度與高溫發泡性等五項快速且簡易之評估方法，結果顯示爐渣Free-CaO含量與光學鹼度成正比，其關係式為Free-CaO（%）=-154.96+227.27（光學鹼度）。本研究利用Sommerville's model的Lp經驗式進行爐渣之Lp計算並與真實脫磷試驗之脫磷率作圖得知其關係亦為線性正比關係，其關係式為（De-P,%）=16.60（lnLp）-55.94。本研究已定義出當脫硫劑擁有Free-CaO高於12%、熔點低於1500℃、1600℃黏度低於250cP與1600℃下Cs值高於0.018等特性，則15分鐘脫硫試驗後脫硫率可達67%以上。本研究已利用Happel所提出之黏度與固化相的關係模型，進行固化相分率與爐渣成份的關係式修正，已推導出CaO-FeO-SiO_2-MgO-Al_2O_3五元渣系之成份與黏度的關係，並利用真實黏度量測數據已驗證其精準度高達94%以上。本研究已建立出高溫黏度與發泡指數的關係，其關係式為Foaming index（%）=59.71+0.0422 Vis（cP）。

關鍵字

爐渣高溫物性快速簡易評估經驗式 ； Free-CaO含量 ； 脫磷 ； 脫硫 ； 高溫黏度 ； 高溫發泡指數

並列摘要

Steelmaking is equal to slag-making. Therefore, in order to develop the high-purity steel product, it is necessary to first produce the superior slag. The high-temperature physical properties of slag can play an important role in slag-making. However, it is time-consuming and difficult to establish a measurement technology of high-temperature physical property. Therefore, if an evaluation experience with highly accurate, quick and easy can be established, it is convenient and efficient to let the engineers in the electric arc furnace (EAF) steel plant understand the property of slag and create excellent slag to achieve the purpose of reducing the slag amount. This investigation established five rapid and simple evaluation methods for determining Free- CaO content, dephosphorization capacity, desulfurization capacity, high-temperature viscosity and high-temperature foaming of slags. Results showed that the Free-CaO content of slag is proportional to the optical alkalinity (Λ), and the relationship is Free-CaO (%) = -154.96 + 227.27 (Λ). This study used the Lp empirical formula of Sommerville's model to calculate the Lp of the slag. The relationship between Lp and dephosphorization ratio (De-P, %) was also linear proportional relationship, and the relationship was (De-P, %) = 16.60 (ln Lp) - 55.94. This study defined that as the desulfurization agent has a Free-CaO higher than 12%, a melting point of less than 1500°C, a viscosity of less than 250cP at 1600 °C and a Cs value of more than 0.018 at 1600 °C, the desulfurization agent can reach more than 67% after 15 minutes of desulfurization test. Happel's relationship model between viscosity and solidification phase was used to correct the relationship between the fraction of solidification phase and the composition of slag. This investigation deduced the relationship between the composition and viscosity in the five-component slag system of CaO-FeO-SiO_2-MgO-Al_2O_3, and verified with measured viscosity. We established a relationship between high-temperature viscosity (Vis) and foaming index: Foaming index (%) = 59.71 + 0.0422 Vis (cP).

並列關鍵字

Empirical formula with rapid and simple to evaluate the high-temperature physical property of slag ； Free-CaO content ； Dephosphorization ； Desulfurization ； High-temperature viscosity ； High-temperature foaming index