焦炭粒度对钛渣冶炼影响研究  

Study on the effect of coke particle size on titanium slag smelting

作　　者：李凯茂[1] 肖军[1] 马勇 宋兵[1] 邱淑兴 Li Kaimao;Xiao Jun;Ma Yong;Song Bing;Qiu Shuxing(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China;Pangang Group Titanium Co.,Ltd.,Panzhihua 617000,Sichuan,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]攀钢集团钛业有限责任公司,四川攀枝花617000 [3]重庆大学材料科学与工程学院,重庆400044

出　　处：《钢铁钒钛》2023年第3期39-44,共6页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金青年基金项目(52104323)。

摘　　要：根据颗粒在流体中自由沉降运动特点,通过理论计算得到连续加料冶炼钛渣条件下被带出焦炭颗粒粒径最大值为0.06 mm。结合工业上应用情况,得到试验用焦炭粒度范围2~8 mm。基于此,考察了焦炭粒度对钛渣冶炼的影响,结果表明,在功率不变条件下,焦炭粒度偏大、反应相对滞后引起冶炼过程烟气温度、CO浓度波动大,冶炼初期存在电极位置快速上升等问题,导致吨渣焦耗、百吨料耗时、吨渣电耗比基准期分别多24 kg、0.18 h、52.07 kWh;相较而言,功率由17.67 MW/h提升至18.14 MW/h(提升0.47 MW/h)时,热力学和动力学条件得到改善,促进焦炭充分反应,消除炉内残碳量,使冶炼更加稳定,同时吨渣焦耗、吨渣电耗比“未提升功率的试验期”分别降低了26 kg、128.12 kWh;焦炭粒度分布变窄且均匀,有利于钛渣冶炼过程和质量稳定控制,而功率提升可有效降低焦炭粒度相对偏大对钛渣冶炼的不利影响。According to the characteristics of free settling movement of particles in the fluid,the theoretical calculation results show that the maximum size of coke particles taken out under the condition of continuous feeding smelting titanium slag is 0.06 mm.Combined with the industrial application,the size range of coke for test is 2~8 mm.Based on this,the influence of coke particle size on titanium slag smelting was investigated.The results show that under the condition of constant power,the flue gas temperature and CO concentration fluctuate greatly in the smelting process,and the electrode position rises rapidly at the beginning of smelting,which is caused by the large coke particle size and relatively delayed reaction.As a result,the consumption per ton of slag coke,the time consumption per hundred tons of material,and the power consumption per ton of slag are respectively 24 kg,0.18 h,52.07 kwWh more than the reference period.By contrast,the power is increased from 17.67 MW/h to 18.14 MW/h(increased by 0.47 MW/h),thermodynamic and kinetic conditions are improved,coke is fully reacted,carbon residue in the furnace is eliminated,and smelting is more stable.At the same time,coke consumption per ton of slag and power consumption per ton of slag are reduced by 26 kg and 128.12 kWh respectively compared with"unraised power test period".The narrow and uniform coke particle size distribution is conducive to the titanium slag smelting process and quality stability control,while the increase of power can effectively reduce the adverse effect of relatively large coke particle size on titanium slag smelting.

关 键 词：钛渣 冶炼 焦炭 粒度下限 电耗 

分 类 号：TF823[冶金工程—有色金属冶金]