Melting and reduction behavior of core-shell microsphere in steel slag
SUN Tao-an1, CAO Rui-hong2, XIA Yun-jin1, WANG Hai-chuan1, FAN Ding-dong1, DENG Ai-jun1,2
1. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243032, Anhui, China; 2. Technology Center, Xinyu Iron and Steel Group Co., Ltd., Xinyu 338001, Jiangxi, China
Abstract:The ultimate goal of this study is the application of steel slag fibrosis. The application technology of core-shell structure in polymer materials science is introduced into the field of iron and steel metallurgy for efficient reduction and refactoring of molten steel slag. The melting and reduction behavior of core-shell microsphere in slag was studied by using ultra-high temperature laser confocal microscope. The effects of temperature and acidity coefficient on the melting rate of microsphere reduction base were analyzed. The results show that when the core-shell microsphere is suspended in the middle part of the slag,the melting reduction reaction reaches the equilibrium state 6 min earlier than that of the conventional powder reduction. The reduction and recovery timeliness of metal oxides in slag is obviously improved. The comparison of core-shell microsphere with different reduction substrates show that the aluminum-based microsphere exhibits an excellent reduction timeliness,and the reduction rate reaches 95.17% within 3 min. The slag with high temperature and high acidity coefficient can promote the rapid melting of core-shell microsphere and effectively improve the thermodynamic conditions of reduction reaction. It can improve the timeliness of metal oxides in reduction slag,and achieve the effect of rapid separation of slag and metal. Based on the melting kinetics model of the substrate and slag interface of microsphere,the effective binary diffusion coefficients of microsphere reduction substrate range from 3.86×10-11 to 4.92×10-11 m2/s under different conditions. For the industrial application of steel slag refactoring and modification by reducing substrate,carbon can be used as the main reducing substrate and an appropriate amount of aluminum or silicon can be added to prepare the core-shell microsphere for the reduction and refactoring of steel slag,which can significantly improve the timeliness of the reduction and refactoring of steel slag and achieve high economic benefits. It provides a new idea for the efficient reduction of steel slag.
孙陶安, 操瑞宏, 夏云进, 王海川, 范鼎东, 邓爱军. 近似核壳型微球对钢渣的熔融还原行为分析[J]. 钢铁, 2023, 58(1): 91-99.
SUN Tao-an, CAO Rui-hong, XIA Yun-jin, WANG Hai-chuan, FAN Ding-dong, DENG Ai-jun. Melting and reduction behavior of core-shell microsphere in steel slag[J]. Iron and Steel, 2023, 58(1): 91-99.
[1] 张作良,陈韧,孟祥然,等. 转炉钢渣物相组成及其显微形貌[J]. 材料与冶金学报,2019,18(1):37.(ZHANG Zuo-liang,CHEN Ren,MENG Xiang-ran,et al. Phase compositions and microstructure of slag in BOF[J]. Journal of Materials and Metallurgy,2019,18(1):37.) [2] 杜传明,于耀辉,袁磊,等. 钢渣中磷分离及回收的研究现状和发展趋势[J]. 钢铁,2020,55(12):1.(DU Chuan-ming,YU Yao-hui,YUAN Lei,et al. Research status and development trend of phosphorus separation and recovery from steelmaking slag[J]. Iron and Steel,2020,55(12):1.) [3] 赵立杰,张芳. 钢渣资源综合利用及发展前景展望[J]. 材料导报,2020,34(增刊2):1319.(ZHAO Li-jie,ZHANG Fang. Comprehensive utilization and development prospect of steel slag resources[J]. Materials Reports,2020,34(s2):1319.) [4] 何延波,吴照金,高志芳,等. 钢渣有价组分的分部高附加值利用[J]. 过程工程学报,2017,17(5):1028.(HE Yan-bo,WU Zhao-jin,GAO Zhi-fang,et al. Respective and high value-added utilization of the valuable components in BOF steel slag[J]. The Chinese Journal of Process Engineering,2017,17(5):1028.) [5] Maruoka N,Sato K,Yagi J,et al. Development of PCM for recovering high temperature waste heat and utilization for producing hydrogen by reforming reaction of methane[J]. Energy,2002,42(2):215. [6] 徐本平. 攀枝花钒钛磁铁矿冶炼过程中主要稀散元素分布走向研究[J]. 材料与冶金学报,2018,17(2):94.(XU Ben-ping. Main elements distribution in Panzhihua vanadium and titanium magnetite smelting process in China[J]. Journal of Materials and Metallurgy,2018,17(2):94.) [7] 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 Jun,YAN Ding-liu,QI Yuan-hong,et al. Difficulty analysis on treatment and utilization of iron and steel smelting slag[J]. Iron and Steel,2020,55(1):1.) [8] 毛艳丽,陈妍,王涿. 高炉渣制矿渣棉工艺及其产品应用[J]. 上海金属,2014,36(2):49.(MAO Yan-li,CHEN Yan,WANG Zhuo. Slag wool production process from blast furnace slag and application of the products[J]. Shanghai Metals,2014,36(2):49.) [9] 王旭,袁守谦,李海潮. 矿渣棉生产发展现状的综述[J]. 中国冶金,2014,24(8):18.(WANG Xu,YUAN Shou-qian,LI Hai-chao. Review of the current situation of the production development of slag wool[J]. China Metallurgy,2014,24(8):18.) [10] 姚建新,边妙莲,杜培培. MgO/Al2O3对高炉渣基矿渣棉制备过程中调质熔渣析晶行为的影响[J]. 钢铁钒钛,2019,40(5):89.(YAO Jian-xin,BIAN Miao-lian,DU Pei-pei. Effect of MgO/Al2O3 on crystallization behavior of molten modified slag in preparation process of blast furnace slag based cotton[J]. Iron Steel Vanadium Titanium,2019,40(5):89.) [11] 龙跃,杜培培,张良进,等. 各因素对离心高炉渣纤维性能及成纤效果的影响[J]. 钢铁研究学报,2017,29(7):530.(LONG Yue,DU Pei-pei,ZHANG Liang-jin,et al. Impact of various factors on property and fiber-forming effect of centrifugal blast furnace slag fibers[J]. Journal of Iron and Steel Research,2017,29(7):530.) [12] 范建峰,肖永力,李永谦,等. 一种利用高温高炉渣和高温电厂渣生产矿棉的方法:中国,CN105217947 A[P]. 2016-01-06.(FAN Jian-feng,XIAO Yong-li,LI Yong-qian,et al. A Kind of Method for Producing Mineral Wool from High Temperature Blast Furnace Slag and High Temperature Power Plant Slag:China,CN105217947 A[P]. 2016-01-06.) [13] 李军,张玲玲,赵贵州,等. 高炉熔渣直接调质改性制备矿棉纤维中试实践[J]. 钢铁,2017,52(9):99.(LI Jun,ZHANG Ling-ling,ZHAO Gui-zhou,et al. Pilot practice of direct modification of molten blast furnace slag and preparation of mineral wool fiber[J]. Iron and Steel,2017,52(9):99.) [14] Takeshi M,Hiroyuki T,Keiji W. Iron and steel slag products and new effective utilization technologies[J]. JFE Technical Report,2018,23:62. [15] Lubca K,Yiannis P,Lieven P. Effect of high cooling rates on the mineralogy and hydraulic properties of stainless steel slags[J]. Metallurgical and Materials Transactions B,2013,44(5):1173. [16] 张玉柱,张遵乾,邢宏伟,等. 熔渣纤维化机理研究进展[J]. 钢铁,2015,50(1):66.(ZHANG Yu-zhu,ZHANG Zun-qian,XING Hong-wei,et al. Research progress on the fiberization mechanism of molten slags[J]. Iron and Steel,2015,50(1):66.) [17] ZHAO Da-wei,ZHANG Zuo-tai,TANG Xu-long,et al. Preparation of slag wool by integrated waste-heat recovery and resource recycling of molten blast furnace slags:From fundamental to industrial application[J]. Energy,2014,7(5):3121. [18] Barati M,Esfahani S,Utigard T A. Energy recovery from high temperature slags[J]. Energy,2011,36(9):5440. [19] Ba Huu Dinh,Dae-Wook Park,Tam Minh Phan. Healing performance of granite and steel slag asphalt mixtures modified with steel wool fibers[J]. Journal of Civil Engineering,2018,22(6):2064. [20] 田铁磊. 高炉渣成纤过程调质剂的熔融机理及均质化行为研究[D]. 秦皇岛:燕山大学,2018.(TIAN Tie-lei. The Dissolution Mechanism and Homogenized Behavior of Modified Agent in the Process of Blast Furnace Slag Fiber Forming[D]. Qinhuangdao:Yanshan University,2018.) [21] 蔡爽,张玉柱,李俊国,等. 调质高炉渣均质化的可行性研究[J]. 钢铁,2016,51(6):34.(CAI Shuang,ZHANG Yu-zhu,LI Jun-guo,et al. Preliminary research on homogenization of adjusted molten BF slag[J]. Iron and Steel,2016,51(6):34.) [22] 殷素红,郭辉,余其俊,等. 还原铁法重构钢渣及其矿物组成[J]. 硅酸盐学报,2013,41(7):966(YIN Su-hong,GUO Hui,YU Qi-jun,et al. Steel slag reconstruction experiment by reduction FeOx and its mineral composition[J]. Journal of the Chinese Ceramic Society,2013,41(7):966.) [23] 张遵乾,张玉柱,邢宏伟. 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 Zun-qian,ZHANG Yu-zhu,XING Hong-wei. Centrifugation fiberization experiment of molten slags and influencing factors of fiberization[J]. Iron and Steel,2017,52(11):69.) [24] 白璞,刘艳娜,孙彦琳,等. 核壳结构复合微球研究进展[J]. 硅酸盐通报,2013,32(4):663(BAI Pu,LIU Yan-na,SUN Yan-lin,et al. Research progress of Core-shell structure composite microspheres[J]. Bulletin of the Chinese Ceramic Society,2013,32(4):663.) [25] 白玉林,王澄,吴越,等. 核壳结构MoOx/C微球的制备及储锂性能[J]. 无机化学学报,2019,35(11):2045(BAI Yu-Lin,WANG Cheng,WU Yue,et al. Preparation and performance for lithium storage of core-shell-structured MoOx/C microspheres[J]. Chinese Journal of Inorganic Chemistry,2019,35(11):2045.) [26] 潘培道,刘孝光,孙小燕,等. 氧化铝包覆二硫化钼复合粉体的制备与表征[J]. 硅酸盐通报,2011,30(5):1212.(PAN Pei-dao,LIU Xiao-guang,SUN Xiao-yan,et al. Preparation and characterization of Al2O3 coating MoS2 composite powders[J]. Bulletin of the Chinese Ceramic Society,2011,30(5):1212.) [27] ZHONG Sheng-wen,HU Xian-chao,YU Yuan,et al. Core-shell hierarchical tungsten carbide composite microsphere s towards me thanol electrooxidation[J]. Journal of Fuel Chemistry and Technology,2018,46(5):585. [28] 杨芾藜,侯兴哲,杨平安,等. 原位还原法制备碳微球/钴核壳结构及其吸波性能测试[J]. 化工新型材料,2017,45(3):84(YANG Fu-li,HOU Xing-zhe,YANG Ping-an,et al. Preparation of carbon microspheres/cobalt core-shell structure by in-situ reduction and absorbing performance testing[J]. New Chemical Materials,2017,45(3):84.) [29] 邓爱军. 高铁用轴承钢冶金过程的关键技术研究[D]. 马鞍山:安徽工业大学,2019.(DENG Ai-jun. Research on the Key Technology of Metallurgical Process of Bearing Steel for High-Speed Rail[D]. Ma′anshan:Anhui University of Technology,2019.) [30] 何赛,林路,刘亚琴,等. 熔融改质含磷钢渣碳热还原回收有价元素试验[J]. 钢铁,2022,57(6):167.(HE Sai,LIN Lu,LIU Ya-qin,et al. Recovery of valuable elements from molten modified phosphorous steel slag by carbothermic reduction[J]. Iron and Steel,2022,57(6):167.) [31] YU Bin,LÜ Xue-wei,XIANG Sheng-lin,et al. Dissolution kinetics of SiO2 into CaO-Fe2O3-SiO2 slag[J]. Metallurgical and Materials Transactions B,2016,47(3):2063. [32] YAN Wei,CHEN Wei-qing,ZHAO Xiao-bo,et al. Effect of Cr2O3 pickup on dissolution of lime in converter slag[J]. High Temperature Materials and Processes,2017,36(9):937. [33] Cho W D,Fan P. Diffusional dissolution of alumina in various steelmaking slags[J]. ISIJ International,2004,44(2):229. [34] Charbonneau B,Charbonneau P,Szamel G. A microscopic model of the Stokes-Einstein relation in arbitrary dimension[J]. The Journal of Chemical Physics,2018,148(22):224503. [35] Feichtinger S,Michelic S K,Kang Y B,et al. In situ observation of the dissolution of SiO2 particles in CaO-Al2O3-SiO2 Slags and mathematical analysis of its dissolution pattern[J]. Journal of the American Ceramic Society,2014,97(1):316. [36] Samaddar B N,Kingery W D,Cooper A R. Dissolution in ceramic systems:11,dissolution of aluminu,mullite,anorthite,and silica in a calcium-aluminum-silicate slag[J]. Journal of the American Ceramic Society,2006,47(5):249.