LF精炼渣的气化脱硫及资源化利用
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摘要
针对我国30多家钢铁企业LF精炼渣处理现状及利用模式进行详细调研发现:LF精炼渣处理方式较为简单,利用层次低,资源浪费严重.同时,LF精炼渣具有光学碱度、硫容量和硫分配比高,熔化温度和黏度较低的特点,可以在冶金内循环利用,但渣中硫的富集成为其在冶金内循环利用中的限制环节.基于此,开展LF精炼渣氧化除硫试验及冶金回用分析研究.结果表明:LF精炼渣中的硫可被O2氧化成SO2;在1370℃和1400℃时,吹气10 min除硫率可达47%以上,而吹气60 min后除硫率基本可达90%以上,吹空气除硫效果明显,完全满足LF精炼渣冶金回用时对硫含量的要求.最终提出了一种简单高效且与现行生产工艺结合较好的LF精炼渣在冶金中再利用的新思路.
The present situation and utilization mode of LF refining slag were investigated in detail for more than 30 typical iron and steel enterprises in China. It is found that the treatment method of LF refining slag is relatively simple,the utilization level is low and the waste of resources is serious. Meanwhile,LF refining slag is characterized by high optical basicity,high sulfur capacity,high sulfur distribution ratio,low melting temperature,and low viscosity. So LF refining slag could be recycled in smelting process,but sulfur enrichment is a restriction factor during the cyclic utilization. To solve this problem,the sulfur removal test and metallurgical recycling utilization of LF refining slag were carried out. The results show that sulfur in LF refining slag can be oxidized to SO2 by O2,and it has good desulfurization result when blowing air into the slag at 1643 K and 1673 K. Sulfur removal at 10 min by blowing air is over47%,and over 90% at 60 min,and it can meet the sulfur content requirement of LF refining slag used for smelting process. Finally,a simple and efficient method of LF refining slag used for smelting process is proposed,which goes well with current steelmaking process.
The present situation and utilization mode of LF refining slag were investigated in detail for more than 30 typical iron and steel enterprises in China. It is found that the treatment method of LF refining slag is relatively simple,the utilization level is low and the waste of resources is serious. Meanwhile,LF refining slag is characterized by high optical basicity,high sulfur capacity,high sulfur distribution ratio,low melting temperature,and low viscosity. So LF refining slag could be recycled in smelting process,but sulfur enrichment is a restriction factor during the cyclic utilization. To solve this problem,the sulfur removal test and metallurgical recycling utilization of LF refining slag were carried out. The results show that sulfur in LF refining slag can be oxidized to SO2 by O2,and it has good desulfurization result when blowing air into the slag at 1643 K and 1673 K. Sulfur removal at 10 min by blowing air is over47%,and over 90% at 60 min,and it can meet the sulfur content requirement of LF refining slag used for smelting process. Finally,a simple and efficient method of LF refining slag used for smelting process is proposed,which goes well with current steelmaking process.
引文
[1] Liu H H. Research on theory and method of LF refining slag desulfurization. Shandong Metall,2014,36(2):46(刘航航. LF精炼废渣循环利用脱硫方法探讨.山东冶金,2014,36(2):46)
[2] Yi G L,Shi Y L. Studies on re-utilization of LF cold steel-making slag. Steelmaking,2014,30(3):46(仪桂兰,史永林. LF冷态碳钢精炼渣循环再利用的试验研究.炼钢,2014,30(3):46)
[3] Yu H X,Wang X H,Wang M,et al. Desulfurization ability of refining slag with medium basicity. Int J Miner Metall Mater,2014,21(12):1160
[4] Zhao L H,Lin L,Wu Q F. Experimental study on sulfur removal of LF refining slag in hot state by blowing air. Int J Miner Metall Mater,2016,23(1):33
[5] Yu X W. Test analysis on hot state LF refining slag recycling.Shandong Metall,2017,39(4):34(于学文. LF热态精炼渣循环再利用试验分析.山东冶金,2017,39(4):34)
[6] He B T,Weng Y J,Li Y J,et al. Study on recycling utilization technology of refining slag in LF furnace. Hebei Metall,2017(8):72(贺保堂,翁玉娟,李彦军,等. LF炉精炼渣循环利用技术研究.河北冶金,2017(8):72)
[7] He H Y,Ni H W,Gan W G,et al. Sulfur’s existence form and sulf-phase forming mechanism in solidified refining slag. Iron Steel,2009,44(3):32(何环宇,倪红卫,甘万贵,等.精炼钢渣硫赋存形式及含硫相形成机理.钢铁,2009,44(3):32)
[8] Dippenaar R. Industrial uses of slag(the use and re-use of iron and steelmaking slags). Ironmaking Steelmaking,2005,32(1):35
[9] Ding G Y,Xu Z H,Shi C W,et al. Development and application of re-utilization technology of LF hot steel-making slag. Steelmaking,2006,22(4):12(丁广友,徐志荣,史翠薇,等. LF热态钢渣循环再利用技术的开发与应用.炼钢,2006,22(4):12)
[10] Akitoshi M,Yu-ichi U,Naoki K,et al. Effects of temperature and oxygen potential on removal of sulfur from desulfurization slag. ISIJ Int,2017,57(6):1012
[11] Cui Y Y,Wang D Y,Liu C J,et al. The novel technology of two-step roasting desulfurization for sulfur-bearing slag. Iron Steel Vanadium Titanium,2013,33(6):31(崔玉元,王德永,刘承军,等.冶金废渣“两段式”焙烧脱硫新工艺研究.钢铁钒钛,2013,33(6):31)
[12] Huang Y,Xu G P,Cheng H G,et al. An overview of utilization of steel slag. Procedia Environmental Sciences,2012,16(4):791
[13] Zhang J Y. Metallurgical Physical Chemistry. Beijing:Metallurgical industry press,2009(张家芸.冶金物理化学.北京:冶金工业出版社,2009)
[14] Pelton A D,See J B,Elliott J F. Kinetics of evolution of SO2from hot metallurgical slags. Metall Trans,1974,5(5):1163
[15] Wu S W,Wang S H,Jin S T. Kinetics of gas desulphurization in BOF slag. J Univ Sci Technol Beijing,2000,22(3):212(吴胜文,王书桓,金山同.气化脱硫动力学.北京科技大学学报,2000,22(3):212)
[16] Wei S K,Wang K C. Thedesulphurization of molten slags in the gaseous phase during top-blown with air. Acta Metall Sinica,1965,8(4):420(魏寿崑,王国忱.空气頂吹过程中熔渣的气态脫硫.金属学报,1965,8(4):420)
[2] Yi G L,Shi Y L. Studies on re-utilization of LF cold steel-making slag. Steelmaking,2014,30(3):46(仪桂兰,史永林. LF冷态碳钢精炼渣循环再利用的试验研究.炼钢,2014,30(3):46)
[3] Yu H X,Wang X H,Wang M,et al. Desulfurization ability of refining slag with medium basicity. Int J Miner Metall Mater,2014,21(12):1160
[4] Zhao L H,Lin L,Wu Q F. Experimental study on sulfur removal of LF refining slag in hot state by blowing air. Int J Miner Metall Mater,2016,23(1):33
[5] Yu X W. Test analysis on hot state LF refining slag recycling.Shandong Metall,2017,39(4):34(于学文. LF热态精炼渣循环再利用试验分析.山东冶金,2017,39(4):34)
[6] He B T,Weng Y J,Li Y J,et al. Study on recycling utilization technology of refining slag in LF furnace. Hebei Metall,2017(8):72(贺保堂,翁玉娟,李彦军,等. LF炉精炼渣循环利用技术研究.河北冶金,2017(8):72)
[7] He H Y,Ni H W,Gan W G,et al. Sulfur’s existence form and sulf-phase forming mechanism in solidified refining slag. Iron Steel,2009,44(3):32(何环宇,倪红卫,甘万贵,等.精炼钢渣硫赋存形式及含硫相形成机理.钢铁,2009,44(3):32)
[8] Dippenaar R. Industrial uses of slag(the use and re-use of iron and steelmaking slags). Ironmaking Steelmaking,2005,32(1):35
[9] Ding G Y,Xu Z H,Shi C W,et al. Development and application of re-utilization technology of LF hot steel-making slag. Steelmaking,2006,22(4):12(丁广友,徐志荣,史翠薇,等. LF热态钢渣循环再利用技术的开发与应用.炼钢,2006,22(4):12)
[10] Akitoshi M,Yu-ichi U,Naoki K,et al. Effects of temperature and oxygen potential on removal of sulfur from desulfurization slag. ISIJ Int,2017,57(6):1012
[11] Cui Y Y,Wang D Y,Liu C J,et al. The novel technology of two-step roasting desulfurization for sulfur-bearing slag. Iron Steel Vanadium Titanium,2013,33(6):31(崔玉元,王德永,刘承军,等.冶金废渣“两段式”焙烧脱硫新工艺研究.钢铁钒钛,2013,33(6):31)
[12] Huang Y,Xu G P,Cheng H G,et al. An overview of utilization of steel slag. Procedia Environmental Sciences,2012,16(4):791
[13] Zhang J Y. Metallurgical Physical Chemistry. Beijing:Metallurgical industry press,2009(张家芸.冶金物理化学.北京:冶金工业出版社,2009)
[14] Pelton A D,See J B,Elliott J F. Kinetics of evolution of SO2from hot metallurgical slags. Metall Trans,1974,5(5):1163
[15] Wu S W,Wang S H,Jin S T. Kinetics of gas desulphurization in BOF slag. J Univ Sci Technol Beijing,2000,22(3):212(吴胜文,王书桓,金山同.气化脱硫动力学.北京科技大学学报,2000,22(3):212)
[16] Wei S K,Wang K C. Thedesulphurization of molten slags in the gaseous phase during top-blown with air. Acta Metall Sinica,1965,8(4):420(魏寿崑,王国忱.空气頂吹过程中熔渣的气态脫硫.金属学报,1965,8(4):420)