包钢烧结矿调整SiO_(2)含量生产实践

Production Practices of Adjusting SiO_(2)Content for Sinter of Baotou Steel

文章就包钢500 m 2烧结机基于不同SiO_(2)含量在烧结矿中的作用,进行了烧结矿SiO_(2)含量为4.75%、4.85%、4.95%、5.15%、5.30%的烧结生产,结果表明:烧结矿中SiO_(2)含量小于5.15%时,随着烧结矿SiO_(2)含量逐步增加,烧结矿转鼓强度提高;在SiO_(2)含量为5.15%左右时烧结矿转鼓强度达到最佳,较SiO_(2)含量为4.75%时提高了3%,平均粒径提高1.77 mm;当烧结矿SiO_(2)含量从5.15%增加至5.30%以上时,随着SiO_(2)含量继续增加,转鼓强度变化不大。综合不同SiO_(2)含量的烧结矿显微结构分析,随着SiO_(2)含量的增加,板柱状的铁酸钙增加,当SiO_(2)含量增加到5.30%左右,部分区域硅酸二钙大面积富集。在包钢烧结高自产精矿比例条件下,控制烧结矿SiO_(2)含量为5.15%左右,烧结矿转鼓强度可以达到79.5%以上,平均粒径可以提高到19 mm以上。

In this paper,the sintering productions with such SiO_(2)contents in sinter as 4.75%,4.85%,4.95%,5.15%and 5.30%are carried out based on the effects of different SiO_(2)contents on sinter with 500 m 2 sintering machine.The results showed that the drum strength of sinter was increased with gradual increase of SiO_(2)content in sinter when SiO_(2)content in sinter was less than 5.15%;the drum strength of sinter was optimum when SiO_(2)content in sinter was about 5.15%,which was increased by 3%compared with that of 4.75%and average particle size was increased by 1.77 mm;the drum strength changed slightly with continuous increase of SiO_(2)content when SiO_(2)content in sinter was increased from 5.15%to above 5.30%.The analysis on the microstructure of sinter with different SiO_(2)contents showed that the prismatic tabular calcium ferrite was increased with the increase of SiO_(2)content and the dicalcium silicate of partial region was with large area enrichment.With the high proportion of self-produced concentrate of Baotou Steel,the SiO_(2)content is controlled at about 5.15%,drum strength of sinter can reach above 79.5%and average particle size can be improved above 19 mm.