钒钛铁精矿内配碳球团压团工艺研究  

Briquett Process of Vanadium and Titanium Iron Concentrate Pellets Containing Carbon

作　　者：刘松利[1,2] 白晨光[1] 胡途[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]攀枝花学院材料工程学院,四川攀枝花617000

出　　处：《稀有金属》2011年第1期83-88,共6页Chinese Journal of Rare Metals

基　　金：国家重点基础研究发展计划"973计划"资助项目(2007CB613503)

摘　　要：内配碳球团性能(落下次数、抗压强度等),对于直接还原生产海绵铁时获得较高金属化率极为重要。首先初步确定每个因素的基准参数,通过改变其参数值进行一系列单因素试验,然后根据正交试验原理,设计了四因素三水平试验条件,采用769YP-60E型手动压片机对钒钛铁精矿内配碳球团压团工艺参数进行试验研究,最后运用极差分析法和方差分析法对试验数据进行处理,对影响球团性能的各因素进行显著性检验。结果表明:利用实验结果和极差分析综合比较确定了使生球落下次数较高的工艺条件分别为A2B2C3D2,即矿煤粒度比(200:60)、水分8%、粘结剂0.3%、压力为10MPa;方差分析将因素水平变化所引起的结果差异与误差波动带来的试验结果间的差异区分开来,得出影响落下次数的主次因素分别B2A2D2C3,即球团水分是影响球团性能或压团工艺参数的主要因素,矿煤粒度比对球团性能有较大影响,压团压力和粘结剂浓度对各项指标的影响最小;生球团要进行干燥处理,干燥温度为105℃,干燥时间控制在2h左右,所得球团的抗压强度为98N个/、高温爆裂性能小于20%,能满足转底炉直接还原工艺的要求。Pellets containing carbon performance such as falling number,compressive strength and so on were extremely important to get higher metallization rate for producing sponge iron by direct reduction methods.First,each factor of benchmark parameters was determined preliminary,a series of single factor experiments were investigated by changing the parameters value.Then,according to the principle of orthogonal test design,the four factors and three levels test conditions were designed.Briquette process parameters of vanadium and titanium iron concentrate pellets containing carbon were studied using 769YP-60E type manual briquette machine.Finally,test dates were analyzed by extreme difference analysis and variance analysis.Influence factors of pelletizing properties were tested.Research results showed that process conditions on higher falling number of raw pellets which were determined by comprehensive comparison of experimental results and extreme difference analysis respectively were A2B2C3D2,namely mine and coal size ratio was 200∶ 60,moisture was 8%,binder was 0.3%,and pressure was 10 MPa.Variance analysis was used to distinguish different results which were induced by factors level changes and error fluctuation.The main affecting factors of pellets performance or briquette process parameters respectively were B2A2D2C3,namely pellets moisture,mine and coal size ratio,pressure and binder concentration.Raw pellets must be processed by drying.When the drying temperature was 105 ℃,the drying time was controlled in 2 h.The compressive strength of the pellets was 98 N/a,high temperature burst performance of the pellets was less than 20%,which could meet the requirement of direct reduction process by rotary hearth furnace.

关 键 词：正交试验 压团工艺 钒钛铁精矿 球团 

分 类 号：TF04[冶金工程—冶金物理化学]