Study on Feasibility and Superiority of Preparing TiO2-Rich Burdens by Composite Agglomeration Process

Titanomagnetite concentrate is known for the difficulty of its sintering by traditional sintering process (TSP) because of a high content of TiO2. In this study, the feasibility study of blast furnace burden preparation was carried out by composite agglomeration process (CAP). The work in this study focuses on the effects of titanomagnetite concentrate ratio, composite basicity, and coke breeze dosage on agglomeration indexes of CAP. The calculation results of the pneumatics of sintered bed show that CAP optimizes the particle size distribution of the mixed feed and increases the voidage of the material layer, which improves the permeability index. Under the following experimental conditions (coke breeze dosage of 3.8 wt.%, pelletized feed proportion of 25%, and composite basicity of 1.76), a sintering yield of 73.60%, productivity of 1.58t & BULL;(m(2) h), and RDI+3.15 of 76.76% have been achieved by CAP, which were 12.10%, 49.06%, and 16.71% higher than those by TSP, respectively. Under same conditions of composite basicity, agglomeration technical indexes of CAP are obviously better than those of TSP. CAP is an effective method to produce low-basicity sinter, which can reduce the proportion of acid pellets that cost more in blast furnace burden.

Automated summary

This study investigated the feasibility of blast furnace burden preparation using the composite agglomeration process (CAP) for titanomagnetite concentrate. The results showed that CAP optimized the particle size distribution of the feed and increased the voidage of the material layer, improving permeability index. Under specific experimental conditions, CAP achieved higher sintering yield, productivity, and RDI+3.15 compared to traditional sintering process (TSP). CAP also exhibited better agglomeration technical indexes than TSP under the same composite basicity conditions. It is an effective method for producing low-basicity sinter and reducing the proportion of expensive acid pellets in the burden.