Experimental on coke reduction dephosphorization converter slag gasification dephosphorization
GUO Rui-hua1, WANG Shu-huan1,2, LI Chen-xiao1,2, ZHOU Chao-gang1,2, ZHAO Ding-guo1,2, CHEN Hu3
1. School of Metallurgy and Energy, North China University of Technology, Tangshan 063210, Hebei, China; 2. Tangshan Special Metallurgy and Material Preparation Laboratory, Tangshan 063210, Hebei, China; 3. Manufacturing Department, Shougang Jingtang United Iron and Steel Co. , Ltd. , Tangshan 063200, Hebei, China
Abstract：In order to solve the problem that the phosphorus mass percent in the dephosphorization converter slag is too high to directly realize the recycling in the converter,the hot state experiment of coke reduction dephosphorization converter slag was carried out in the laboratory,and the effects of different carbon equivalent,temperature,alkalinity,FeO mass percent,and nitrogen flow rate on the gasification dephosphorization rate were systematically studied. The results show that the gasification dephosphorization effect using the twice carbon equivalent is better,and the gasification dephosphorization rate gradually increases with the increase of temperature,reaching 68.6% at 1 733 K;The gasification dephosphorization rate gradually increases with the decrease of alkalinity. When the alkalinity is controlled to 1.4,the gasification dephosphorization rate can reach 45.6%. When the FeO mass percent varies from 10% to 30%,the gasification dephosphorization rate increases first and then decreases with the increase of FeO mass percent. When the FeO mass percent is 25%,the gasification dephosphorization rate can reach 43.5%. The gasification dephosphorization rate first increases and then decreases with the increase of nitrogen flow rate. When the nitrogen flow rate is 80 L/h,the gasification dephosphorization rate is 45.37%. From SEM analysis results,it can be seen that phosphorus in dephosphorization slag is mainly enriched in silicon and calcium enrichment areas,and there is no special rule of phosphorus distribution in micro-areas after gasification dephosphorization reaction.
[1] Morita K,Guo M,Okan,et al. Resurrection of the iron and phosphorus resource in steel-making slag[J]. Journal of Material Cycles and Waste Managemen,2002,4(2):93. [2] Ibraev K,Ibraev T. Problems of dephosphorization during steelmaking[J]. Russian Metallurgy,2013(12):435. [3] Dippenaar R. Industrial uses of slag-the use and re-use of iron and steelmaking slags[J]. Ironmaking and Steelmaking,2005,32(1):35. [4] 郝华强,王书桓,张朝发,等. 转炉热态熔渣脱磷及循环利用生产实践[J]. 中国冶金,2018,28(6):56.(HAO Hua-qiang,WANG Shu-huan,ZHANG Chao-fa,et al. Dephosphorization and recycle utilization practice of molten slag in converter[J]. China Metallurgy,2018,28(6):56.) [5] 丛铁地,彭飞,王甲贵.本钢180 t转炉复吹工艺的研究与应用[J].冶金能源,2020,39(3):10.(CONG Tie-di,PENG Fei,WANG Jia-gui. Research and application of Bensteel 180 t converter combined blowing process[J]. Energy for Metallurgical Industry,2020,39(3):10.) [6] 丛铁地,刘书超,张艳龙,等. 复吹转炉终点强搅拌下的炉内回磷行为研究[J].冶金能源,2020,39(2):12.(CONG Tie-di,LIU Shu-chao,ZHANG Yan-long,et al. Study on the behavior of rephosphorizing by strong stirring in end-point for BOF[J]. Energy for Metallurgical Industry,2020,39(2):12.) [7] 吴胜文. 溅渣层炉渣特性及气化脱硫[D]. 北京:北京科技大学,2000.(WU Sheng-wen. Slag Characteristics and Gasification Desulfurization of Slag Splashing Layer[D]. Beijing:University of Science and Technology Beijing,2000.) [8] 盛利貞,諸岡明,国分春生. 冶金用スラグからの気化脱硫[J]. 鐵と鋼,1983,69:582.(Morit S,Morooka A,Kubo H. Vaporization desulfurization from metallurgical slag[J]. Iron and Steel,1983,69:582.) [9] 孙树杉,朱桂林,张宇. 中国钢铁渣处理利用现状及“零排放”的途径[J]. 中国废钢铁,2007(2):21.(SUN Shu-shan,ZHU Gui-lin,ZHANG Yu. Current status of steel slag treatment and utilization in China and the approach of "zeroemissions"[J]. China Waste Steel,2007(2):21.) [10] 宋海燕,牛建刚,崔宝霞. 钢铁工业固体废弃物利用效益综合评价[J]. 钢铁,2017,52(2):85.(SONG Hai-yan,NIU Jian-gang,CUI Bao-xia. Comprehensive evaluation of solid waste utilization benefit in iron and steel industry[J]. Iron and Steel,2017,52(2):85.) [11] 宫下方雄,柳井明,山井健三,等. 製鋼溶融スラグの処理方法: 日本,特开昭 51-121030[P].1975-04-16.(Miyashita Yu,Yanai Akira,Yamai Kenzo,et al. Steelmaking Molten Slag Treatment Method: Japan, Tokukai Sho 51-121030[P].1975-04-16.) [12] 李光强,张峰,张力,等. 高温碳热还原进行转炉渣资源化的研究[J]. 材料与冶金学报,2003,2(3):167.(LI Guang-qiang,ZHANG Feng,ZHANG Li,et al. Research on there cycling of converter slag by high-temperature carbothermal reduction[J]. Journal of Materials and Metallurgy,2003,2(3):167.) [13] 薛月凯,王书桓,李晨晓,等. 60 t转炉炉渣气化脱磷后循环利用试验研究[J]. 炼钢,2018,34(1):20.(XUE Yue-kai,WANG Shu-huan,LI Chen-xiao,et al. Experimental study on ecycling of 60 t converter slag gasification and dephosphorization[J]. Steelmaking,2018,34(1):20.) [14] 王书桓,吴艳青,刘新生,等. 硅还原转炉熔渣气化脱磷实验研究[J]. 钢铁,2008,43(2):31.(WANG Shu-huan,WU Yan-qing,LIU Xin-sheng,et al. Experimental research on desulfurization of slag gasification in a silicon reduction converter[J]. Iron and Steel,2008,43(2):31.) [15] 王书桓,吴艳青,徐志荣,等. 硅还原转炉熔渣气化脱磷热力学分析[J]. 炼钢,2008,24(1):31.(WANG Shu-huan,WU Yan-qing,XU Zhi-rong,et al. Thermodynamic analysis of desulfurization of slag gasification in silicon reduction converter[J]. Steelmaking,2008,24(1):31.) [16] 黄希祜. 钢铁冶金原理 [M]. 3版. 北京:冶金工业出版社,2004.(HUANG Xi-hu. Principles of Iron and Steel Metallurgy[M]. 3rd edition. Beijing:Metallurgical Industry Press,2004.) [17] 李晨晓,赵定国,薛月凯,等. 承钢半钢熔渣气化脱磷循环利用试验研究[J]. 炼钢,2019,35(4):19.(LI Chen-xiao,ZHAO Ding-guo,XUE Yue-kai,et al. Experimental research on slag gasification dephosphorization and recycling of Chenggang semi-steel[J].Steelmaking,2019,35(4):19.) [18] Shinya F,Tasuku H,Fumitaka T. Formation reaction of phosphate compound on multiphase flux at 1 573 K[J]. ISIJ International,2007,47(1):187. [19] Iwama T,Du C M,Koizumi S,et al. Extraction of phosphorus and recovery of phosphate from steelmaking slag by selective leaching[J]. Tetsu-to-Hagane,2019,105(4):69. [20] Yang X,Matsuura H,Tsukihashi F. Condensationof P2O5 at theinterfacebetween 2CaO·SiO2and CaO-SiO2-FeOx-P2O5slag[J]. ISIJ International,2009,49(9):1298. [21] 王艺慈,李海洋,李双威,等. 转炉钢渣气化脱磷反应的热力学分析及试验[J]. 钢铁研究学报,2016,28(6):31.(WANG Yi-ci,LI Hai-yang,LI Shuang-wei,et al. Thermodynamic analysis and experiment of dephosphorization reaction of converter steel slag gasification[J]. Journal of Iron and Steel Research,2016,28(6):31.) [22] 李晨晓,王书桓,薛月凯,等. 焦粉还原转炉熔渣气化脱磷试验[J]. 钢铁,2018,53(9):21.(LI Chen-xiao,WANG Shu-huan,XUE Yue-kai,et al. Test on dephosphorization of slag gasification by coke powder reduction converter[J]. Iron and Steel,2018,53(9):21.) [23] 赵宏欣. 流动氮气条件下熔渣气化脱磷热力学研究[D]. 唐山:河北联合大学,2006.(ZHAO Hong-xin. Thermodynamic Study on Slag Gasification Dephosphorization Under Flowing Nitrogen[D]. Tangshan:Hebei United University,2006.) [24] 周进东,黄治成. 固体CaO在3CaO·P2O5-2CaO·SiO2饱和熔渣中的溶解及反应机理[J]. 钢铁研究学报,2019,31(5):425.(ZHOU Jin-dong,HUANG Zhi-cheng. Dissolution and reaction mechanism of solid CaO into 3CaO·P2O5-2CaO·SiO2saturated molten slag[J]. Journal of Iron and Steel Research,2019,31(5):425.) [25] Yokoyama K,Kuboh,Morik,et al. Separation and recovery of phosphorus from steelmaking slag with the aid of a strong magnetic field[J]. ISIJ International,2007,47(10):1541. [26] 吕延春,王新华,秦登平,等. 转炉炼钢渣磷元素的富集及影响因素[J].钢铁,2017,52(10):29.(LÜ Yan-chun,WANG Xin-hua,QIN Deng-ping,et al. Enrichment and influencing factors of phosphorus in slag of converter steelmaking[J]. Iron and Steel,2017,52(10):29.) [27] 周寒梅,包燕平,林路. P2O5对CaO-SiO2-FetO-P2O5渣中富磷相的影响[J]. 中国冶金,2013,23(1):45.(ZHOU Han-mei,BAO Yan-ping,LIN Lu. Effect of P2O5 on rich phosphorus phase of CaO-SiO2-FetO-P2O5 slag[J]. China Metallurgy,2013,23(1):45.)
2020, Vol. 55 
