钒钛磁铁矿低硅烧结试验研究  

Experimental research on low silica sintering of vanadium titanium magnetite

作　　者：蒋大均[1] 何木光[1] 甘勤[2] 何群[2] 

机构地区：[1]攀枝花钢铁公司炼铁厂,四川攀枝花617000 [2]攀枝花钢铁研究院,四川攀枝花617000

出　　处：《钢铁研究》2010年第6期4-9,共6页Research on Iron and Steel

摘　　要：低硅烧结由于液相量减少而使烧结矿强度下降,低温还原粉化恶化,产量、质量指标变差。钒钛磁铁矿低硅烧结试验表明,当烧结矿品位由49.10%上升到51.70%,w(SiO2)由5.07%下降到3.84%时,转鼓指数由78.10%下降到66.70%,固体燃耗由58.4 kg/t上升到64.83 kg/t,利用系数先由1.239t/(m2.h)上升到1.363 t/(m2.h)而后又下降到1.317 t/(m2.h)。烧结矿铁酸盐含量减少,硅酸盐含量同时减少,显微结构变得极不均匀,裂纹发展,还原性得到改善,但低温还原粉化率也上升。而烧结矿软化温度、熔化温度均上升,软熔温区和熔滴区间变薄,这有利于高炉冶炼。w(SiO2)降低后采用提高碱度、添加硼化物、使用活性灰、提高料层厚度等强化措施,各项性能指标均优于基准期。Low-silica sintering will result in decrease of sinter strength and worse RDI because of the reduction of liquid phase in sinter.Low-silica sintering experiments of vanadium-titan-ium magnetite showed that the utilization coefficient of sinter firstly increased from 1.293 t/（m2·h） to 1.363 t/（m2·h） and then decreased to 1.317 t/（m2·h）;solid fuel consumption raised from 58.4 kg/t to 64.83 kg/t when sinter grade raised from 49.10 % to 51.70 % and w（SiO2） decreased from 5.07 % to 3.84 %;the drum index decreased from 49.10 % to 51.70 %.Mineral composition and structure examinations showed that ferrite and silicate contents decreased,the microstructure became very uneven and crack expanded.As a result,sinter reducibility improved,but RDI deteriorated.At the same time,however,both the sinter softening temperature and melting temperature increased,and the softening and melting zone became thiner,which is beneficial to blast furnace operation.In the period of low-silica sitering,a series of measures were taken,such as increasing sinter basicity,adding boride in sinter mix,using active lime,enhancing bed thickness,etc.Compared with the base period and contract period,all of the sintering indexes were improved and superior to that in the base period and contract period.

关 键 词：钒钛磁铁精矿 低硅烧结 烧结矿强度 矿物组成 

分 类 号：TF046.4[冶金工程—冶金物理化学]