Abstract：As the main by-product in the ironmaking process, the blast furnace slag (BFS) crystallization capacity determines its potential as an active material. The higher the amorphous phase content, the stronger the activity of the BFS. The gas quenching process can effectively prepare high content amorphous slag beads as increasing the BFS cooling rate, which improves the BFS added value utilization. The BFS mineral phase evolution process is explained and the mineral phase precipitation mechanism is analyzed in the continuous cooling process through the thermodynamic simulation and in-situ observation method, which determines the initial crystallization temperature, initial crystal phase and critical cooling rate. At the same time, the crystallization activation energy and Avrami index are calculated to obtain the BFS composition which is conducive to inhibiting the mineral phase precipitation in the granulation process. The results show that, the initial crystal phase of the BFS with the basicity range of 0.9-1.3 are all gehlenite in the continuous cooling process. The initial crystallization temperature gradually increases and the precipitation amount of melilite increases with the increase of basicity, but a part of the melilite begins to change into dicalcium silicate when the basicity increases to 1.2. At the same time, the increase of basicity inhibits the precipitation of anorthite and augite, but has little effect on the precipitation of spinel. The BFS crystallization critical cooling rate gradually increases, the Avrami index gradually increases, and the crystallization activation energy gradually decreases with the increase of basicity. Therefore, high basicity BFS requires large overcooling to inhibit the mineral phase precipitation, which is conducive to obtaining high content amorphous slag beads. At the same time, the slag beads is prepared by gas quenching BFS with different basicities. The amorphous phase content increases and the transparency degree of slag beads gradually increases with the decrease of BFS basicity, and the amorphous content is higher than the national standard GB/T18046-2008 which the mass percent of slag amorphous phase should not be less than 85%, which provides a theoretical basis for the BFs high added value resources and waste heat efficient utilization.
康月, 张玉柱, 刘超, 邢宏伟, 孙瑞靖, 裴晶晶. 矿物组成对高炉渣破碎粒化效果的影响机理[J]. 钢铁, 2023, 58(10): 172-182.
KANG Yue, ZHANG Yuzhu, LIU Chao, XING Hongwei, SUN Ruijing, PEI Jingjing. Mechanism of mineral composition on effect of blast furnace slag granulation[J]. Iron and Steel, 2023, 58(10): 172-182.
[1] 刘然,张智峰,刘小杰,等. 低碳绿色炼铁技术发展动态及展望[J]. 钢铁,2022,57(5):1.(LIU R,ZHANG Z F,LIU X J,et al. Development trend and prospect of low-carbon green ironmaking technology[J]. Iron and Steel,2022,57(5):1.) [2] 万新宇,严定鎏,高建军,等. 高炉渣干法轮式粒化半工业试验[J]. 中国冶金,2020,30(5): 83.(WAN X Y,YAN D L,GAO J J,et al. Semi-industrial test on dry wheeled granulation for blast furnace slag[J]. China Metallurgy,2020,30(5): 83.) [3] 张士理,赵明,马萍,等. 转杯离心粒化熔融高炉渣数值模拟[J]. 钢铁,2020,55(7):127. (ZHANG S L, ZHAO M,MA P,et al. Numerical modeling of centrifugal granulation of molten blast furnace slag using spinning cups[J]. Iron and Steel,2020,55(7):127.) [4] 柳哲,王艺慈,赵凤光,等. 碱度对包钢高炉渣物理性能的影响[J]. 钢铁研究学报,2019,31(8):696.(LIU Z,WANG Y C,ZHAO F G,et al. Influence of binary basicity on physical properties of blast furnace slag of Baogang Group[J]. Journal of Iron and Steel Research,2019,31(8):696.) [5] 刘帅,张宗旺,张建良,等. 高钛型高炉渣钛提取工艺研究现状及发展展望[J]. 中国冶金,2020,30(3):1.(LIU S,ZHANG Z W,ZHANG J L,et al. Research status and development prospect of titanium extraction from high titanium blast furnace slag[J]. China Metallurgy,2020,30(3):1.) [6] 康月,刘超,张玉柱. 高炉渣作为气淬喷吹原料的可行性分析[J]. 中国冶金,2021,31(5):139.(KANG Y,LIU C, ZHANG Y Z. Feasibility analysis of blast furnace slag as gas quenching raw materials[J]. China Metallurgy,2021,31(5):139.) [7] MARTIN H,STEFAN M,JOSEF F,et al. Evaluation of biomass-based production of below zero emission reducing gas for the iron and steel industry[J]. Biomass Conversion and Biorefinery, 2021,11(1):169. [8] 张遵乾,张玉柱,邢宏伟,等. 熔渣离心成纤试验及其纤维化影响因素分析[J]. 钢铁,2017,52(11):69.(ZHANG Z Q,ZHANG Y Z,XING H W,et al. Centrifugation fiberization experiment of molten slags and influencing factors of fiberization[J]. Iron and Steel,2017,52(11):69.) [9] 吕学伟,严志明,庞正德,等. Al2O3对高炉渣物化性能和结构影响研究综述[J]. 钢铁,2020,55(2):5.(LÜ X W,YAN Z M,PANG Z D,et al. Effect of Al2O3 on physicochemical properties and structure of blast furnace slag: review[J]. Iron and Steel,2020,55(2):5.) [10] 康月,刘超,张玉柱,等. 气淬高炉熔渣冷却凝固相变特性仿真[J]. 中国冶金,2022,32 (5): 116.(KANG Y, LIU C, ZHANG Y Z,et al. Phase transition simulation of air quenching blast furnace slag during cooling and solidification[J]. China Metallurgy,2022,32 (5): 116.) [11] 段文军,吕潇峻,李朝. 高炉渣离心粒化法研究进展综述[J]. 材料与冶金学报,2020,19(2):79.(DUAN W J,LÜ X J,LI C. Review of the progress of high slag centrifugation[J]. Journal of Materials and Metallurgy,2020,19(2):79.) [12] LIU J,QIN Q,YU Q. The effect of size distribution of slag particles obtained in dry granulation on blast furnace slag cement strength[J]. Powder Technology,2020,362:32. [13] LIU J, QIN Q, YU Q. The effect of size distribution of slag particles obtained in dry granulation on blast furnace slag cement strength[J]. Powder Technology,2020, 362(2):32. [14] 吕义文, 朱恂, 王宏, 等. 高温液态熔渣离心粒化余热回收技术[J]. 中国基础科学,2020, 22(2):28.(LÜ Y W,ZHU X,WANG H,et al. Waste heat recovery technology of high temperature liquid slag[J]. China Basic Science,2020, 22(2):28.) [15] 张俊, 严定鎏, 齐渊洪, 等. 钢铁冶炼渣的处理利用难点分析[J]. 钢铁,2020, 55(1):1.(ZHANG J,YAN D L,QI Y H,et al. Analysis of the difficulties in the treatment and utilization of iron and steel smelting slag[J]. Iron and Steel,2020, 55(1):1.) [16] XUAN W W,ZHANG J S,XIA D H. The influence of MgO on the crystallization characteristics of synthetic coal slags[J]. Fuel,2018,15(222):523. [17] WANG Z J,SOHN I I. Effect of the Al2O3/SiO2 mass ratio on the crystallization behavior of CaO-SiO2-MgO-Al2O3 slags using confocal laser scanning microscopy[J]. Ceramics International,2018,44(16):19268. [18] 任倩倩,邱明伟,裴晶晶,等. 氧化铝含量对高炉熔渣析晶行为的影响[J]. 中国冶金,2022,32(4):106.(REN Q Q,QIU M W,PEI J J,et al. Influence of alumina content on crystallization behavior of molten blast furnace slag[J]. China Metallurgy,2022,32(4):106.) [19] 于勇,邢宏伟. 调质渣的析晶行为[J]. 中国冶金,2016,26(10):50.(YU Y,XING H W. Crystallization behavior of modified slag[J]. China Metallurgy,2016,26(10):50.) [20] WEN G H,LIU H,PING T. CCT and TTT diagrams to characterize crystallization behavior of mold fluxes[J]. Journal of Iron and Steel Research International, 2008, 15(4):32. [21] ZHOU L,WANG W,MA F,et al. A kinetic study of the effect of basicity on the mold fluxes crystallization[J]. Metallurgical and Materials Transactions B, 2012, 43(2): 354. [22] LIU H,WEN GH,TANG P. Crystallization behaviors of mold fluxes containing Li2O using single hot thermocouple technique[J]. ISIJ International, 2009, 49(6): 843. [23] QIN Y,LÜ X,ZHANG J. Effect of composition on the crystallization behavior of blast furnace slag using single hot thermocouple technique[J]. Ironmak and Steelmak,2017,44(1):23. [24] 王志宇,张建良,张邦志,等. 高镁铝高炉渣的冶金性能[J]. 中国冶金,2016,26(4):15.(WANG Z Y,ZHANG J L,ZHANG B Z,et al. Metallurgical properties of blast furnace slag with higher Al2O3 and MgO content[J]. China Metallurgy,2016,26(4):15.) [25] 邱国兴,缪德军,蔡明冲,等. 含钛高炉渣黏度和熔化性能[J]. 钢铁,2022,57(11): 42. (QIU G X,MIU D J,CA M C,et al. Viscosity and melting property of titanium-containing slag[J]. Iron and Steel,2022,57(11): 42.) [26] 王震,沈峰满,春城,等. 高铝高炉渣系的熔化特性[J]. 钢铁,2022,57(2):36. (WANG Z,SHEN F M,CHUN C,et al. Melting characteristics of blast furnace slag with high Al2O3[J]. Iron and Steel,2022,57(2):36.) [27] 胡心光,沈峰满,郑海燕,等. 温度对CaO-SiO2-Al2O3-MgO高炉渣系Al2O3活度的影响[J]. 钢铁,2022,57(4):1. (HU X G,SHEN F M,ZHENG H Y,et al. Effect of temperature on Al2O3 activity in CaO-SiO2-Al2O3-MgO blast furnace slag system[J]. Iron and Steel,2022,57(4):1.) [28] 庞正德,吕学伟,严志明,等. 超高TiO2高炉渣黏度及熔化性温度[J]. 钢铁,2020,55(8): 181.(PANG Z D, LÜ X W, YAN Z M,et al. Viscosity and free running temperature of ultra-high TiO2 bearing blast furnace slag[J]. Iron and Steel,2020,55(8): 181.) [29] KANG Y,LIU C,ZHANG Y Z,et al. Influence of crystallization behavior of gas quenching blast furnace slag on the preparation of amorphous slag beads[J]. Crystals. 2020, 10(1):30. [30] KANG Y,LIU C,ZHANG Y Z,et al. Granulation mechanism of gas quenching blast furnace slag with different basicities[J]. Ironmaking and Steelmaking, 2020, 47(10): 1206. [31] 戴晓天,郭培民,齐渊洪,等. 非晶态高炉渣的非等温析晶动力学研究[J]. 钢铁,2008,43(10):17.(DAI X T,GUO P M,QI Y H,et al. Non-isothermic crystal dynamics of amorphous high furnace slag[J]. Iron and Steel,2008,43(10):17.) [32] GAN L, ZHANG C, ZHOU J, et al. Continuous cooling crystallization kinetics of a molten blast furnace slag[J]. Non-Crystallization Solids, 2012,358(1):20. [33] 任倩倩,张玉柱,龙跃,等. 调质高炉渣非等温析晶动力学研究[J]. 东北大学学报(自然科学版),2017,38(7):960.(REN Q Q,ZHANG Y Z,LONG Y,et al. Study of non-isothermal crystallization kinetics of modified blast furnace slag[J]. Journal of Northeastern University(Natural Science),2017,38(7):960.) [34] KANG Y,LIU C,ZHANG Y Z,et al. Crystallization behavior of amorphous slag beads prepared by gas quenching of blast furnace slag[J]. Journal of Non-Crystalline Solids,2018,500(11):453.
2023, Vol. 58 
