鐵礦粉液相流動性的主要液相生成特征因素解析

吳勝利; 蘇博; 齊淵洪; 李園; 杜斌斌

doi:10.13374/j.issn2095-9389.2018.03.008

鐵礦粉液相流動性的主要液相生成特征因素解析

doi: 10.13374/j.issn2095-9389.2018.03.008

吳勝利¹,
蘇博^1,2, ,,
齊淵洪²,
李園¹,
杜斌斌¹

1) 北京科技大學冶金與生態工程學院, 北京 100083;
2) 鋼鐵研究總院先進鋼流程及材料國家重點實驗室, 北京 100081

詳細信息

中圖分類號: TF046.4
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出版歷程
- 收稿日期: 2017-07-30

Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process

WU Sheng-li¹,
SU Bo^{1,2
, ,},
QI Yuan-hong²,
LI Yuan¹,
DU Bin-bin¹

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2) State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China

摘要

摘要: 燒結礦是我國高爐煉鐵的主要原料,燒結礦質量將直接影響高爐冶煉及煉鐵工序的經濟技術指標.因此,基于鐵礦粉的高溫特性進行優化配礦從而改善燒結礦的產質量對于煉鐵工序節能增效具有十分重要的現實意義.鐵礦粉的液相流動性是非常重要的燒結高溫特性指標,適宜的液相流動性可以使燒結礦獲得較高的固結強度.本文模擬實際燒結黏附粉層中鐵礦粉顆粒與鈣質熔劑質點的接觸狀態,采用FastSage熱力學計算和微型燒結可視化試驗方法研究了固定CaO配比條件下鐵礦粉的液相流動性及其主要的熱力學液相生成特征影響因素.研究結果表明,采用固定CaO配比與固定堿度的熔劑配加方式下,鐵礦粉的液相流動性規律明顯不同.鐵礦粉的液相生成量是影響其液相流動性的最主要液相生成特征因素,液相生成量越多則鐵礦粉的液相流動性指數越大.鐵礦粉液相流動性的配合性機制是基于其液相生成量的線性疊加原則.脈石礦物含量將在一定程度上影響鐵礦粉的液相流動性,隨著SiO₂含量的升高鐵礦粉的液相生成量減少,從而導致液相流動性指數顯著降低;而Al₂O₃含量增加,液相流動性指數略有升高.
- 鐵礦粉燒結 /
- 黏附粉 /
- 液相流動性 /
- 熱力學計算 /
- 液相生成特征
Abstract: Sinter ore is one of the main materials of blast furnaces in China, and the productivity of the blast furnace and the economic and technical indicators of the ironmaking process are directly influenced by sinter yield and quality. Therefore, the ore-blending process should be optimized based on the high-temperature characteristics of iron ore to improve the sinter yield and quality and the energy efficiency of the ironmaking process. The liquid phase fluidity of iron ore is a vital characteristic of high-temperature sintering, since a suitable liquid phase fluidity of blended ores produces a sintered body with a stronger bonding strength. In this paper, by simulating the contact state of the iron ore particles and the calcareous flux particles in the actual sintering adhering fines, the FactSage thermodynamic calculation and the visible micro-sintering tests were conducted to study the liquid phase fluidity indexes of different iron ores and the major melt formation characteristic factors that influenced the liquid phase fluidity of iron ore under fixed CaO ratio conditions. The results show that the rule of liquid phase fluidity of iron ores under a fixed CaO ratio is different from the rule of liquid phase fluidity of iron ores with fixed alkalinity. According to the fitting relationship between the calculation results by Factsage software and the testing results of liquid phase fluidity index of the 9 kinds of iron ores, the formed melt content of iron ore is the most important melt formation characteristic factor that affects liquid phase fluidity. The formed melt content and the liquid phase fluidity index are directly related, and the coordination mechanism of liquid phase fluidity of iron ore is based on the principle of linear superposition of the formed melt content. Furthermore, the content of gangue minerals affects the liquid phase fluidity of iron ore to some extent. The liquid fluidity index decreases greatly with increased SiO₂ content, leading to lower formed melt content, while the liquid fluidity index slightly increases with increased Al₂O₃ content.
- iron ore sintering /
- adhering fines /
- liquid phase fluidity /
- thermodynamic calculation /
- melt formation characteristics

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參考文獻(12)

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