攀钢细粒级高品位钒钛磁铁精矿烧结试验研究

Experimental study on sintering of fine grained high-grade vanadium titanium magnetite concentrate from Pangang

针对高品位钒钛磁铁矿的理化性能,开展了单烧对比试验、高品位矿不同替代配比试验和最高替代配比条件下烧结燃料配比、混合料水份及料层厚度对烧结技术经济指标的参数寻优正交试验研究,试验研究表明,高品位矿具有高铁、低硅钛、粒度更细的特点,且对混合料水分控制非常敏感。随着烧结中高品位矿配比提高,烧结指标综合评分呈降低趋势,对该种烧结矿的技术经济指标的影响从大到小依次是水分、燃料配比、料层厚度,实验室得到的该种烧结矿最优烧结条件为混合料水6.5%,燃料比4.2%,料层厚度670 mm。工业试验结果表明,在烧结中配加20%的该种矿物,烧结矿TFe品位提高0.8个百分点,TiO_(2)含量降低0.6个百分点,转鼓指数基本不变,烧结烟气中SiO_(2)浓度降低22%。

In view of the physical and chemical properties of high-grade vanadium titanium magnetite,single firing contrast experiment,different substitute ratio experiment of high-grade ore and orthogonal experimental study on parameter optimization of sintering technical and economic indexes of sintering fuel ratio,mixture moisture and material layer thickness under the condition of highest substitute ratio were carried out.The experimental study shows that the high-grade ore has the characteristics of high iron,low silicon and titanium,finer particle size and is very sensitive to the moisture control of the mixture.With the increase of the ratio of high-grade ore in sintering,the comprehensive score of sintering index shows a decreasing trend.The influence on the technical and economic indexes of this sinter is water,fuel ratio and material layer thickness in descending order.The optimal sintering conditions of this sinter obtained in the laboratory are as follows:mixture water 6.5%,fuel ratio 4.2%and material layer thickness 670 mm.Industrial test results show that the sintered with addition of 20%of the mineral,the sinter high sinter TFe grade is increased by 0.8%,0.6%lower content of TiO_(2),drum index is basically remain unchanged,the concentration of SiO_(2) sintering flue gas imports in low 22%.