烧结矿转鼓强度的优化研究

Research on Optimization of Sinter Drum Strength

针对某钢厂在烧结过程中出现转鼓强度急剧下降的现象,通过烧结杯实验探究不同配碳量条件下形成烧结矿转鼓强度下降的碱度范围,并结合烧结矿的矿相结构分析其降低的内在机理,进而提出优化措施,避免其在实际生产中造成的损失。实验结果表明:配碳量为3.25%时,强度分3个阶段呈现上升趋势,而当配碳量为3.50%和3.75%时,均在碱度1.5~1.7区域出现强度下降8%左右的现象。原因是此时矿物成分多且复杂,矿相结构变得极不均匀,并伴随少量裂纹出现,因此导致烧结矿转鼓强度急剧下降。

In view of the phenomenon that the drum strength decreases sharply during the sintering process of a steelworks,the sinter pot experiment was used to explore the alkalinity range of the sinter drum strength reduction under different carbon content condition,combined with the mineralogical structure of sinter,the inherent mechanism of its reduction was analyzed,and the optimization measures were put forward to avoid the loss in actual production.The results show that the strength increases in three stages when the carbon content is 3.25%,while in the alkalinity 1.5-1.7 area the strength decreases by about 8%when the carbon content is 3.50%and 3.75%.The reason is that at this time,the mineral composition is much and complex,the mineralogical structure becomes extremely uneven,and a few cracks appear,which leads to a sharp decline in the strength of the sinter drum.Therefore,the alkalinity can be increased by adding a small amount of quicklime or dolomite at the same carbon level in the future production,and 3.25%can be used when the alkalinity is less than or equal to 2.4%carbon level,effectively avoid the problem of sharp decline in strength,to meet the cold strength requirement of sinter.