Efficient Preparation of Blast Furnace Burdens from Titanomagnetite Concentrate by Composite Agglomeration Process

Titanomagnetite concentrate is difficult to agglomerate by the traditional sintering process (TSP). In this study, the agglomeration properties of titanomagnetite concentrate were studied using the composite agglomeration process (CAP). It was shown that, by adding 40 wt.% pelletized feed, an excellent sinter with yield of 74.33%, a tumbler index of 58.93%, and productivity of 1.65 t (m(2) h)(-1) were achieved, which were increased by 11.72%, 12.03%, and 37.16% compared with TSP, respectively. Meanwhile, for CAP, the solid fuel consumption was only 43.87 kg(coke)/t(product) and the reduction disintegration index of RDI+3.15 was 73.53%. They were decreased by 6.34 kg(coke)/t(product) and increased by 24.31%, respectively. The better product quality was mainly attributed to a larger proportion of calcium ferrite and silicoferrite of calcium and aluminum group minerals formed in CAP, which restrained the negative effect of perovskite on agglomeration in association with the matrix feed with ultra-high basicity. The results showed that CAP is an efficient method for agglomeration of titanomagnetite concentrate.

Automated summary

This study investigated the agglomeration of titanomagnetite concentrate using the composite agglomeration process (CAP) and found that CAP resulted in higher yield and better product quality compared to the traditional sintering process. The improved properties were attributed to the formation of calcium ferrite and silicoferrite of calcium and aluminum group minerals in CAP, which helped overcome the negative effects of perovskite on agglomeration.