Applying Biochar Composite Briquette for Energy Saving in Blast Furnace Ironmaking
In this research, carbon composite briquette (CCB) was prepared using ultrafine iron-oxide fine (Size = 2.0 μm), and biochar fines (Size = 45.0 μm) by cold briquetting followed by heat treatment. Anti-pulverization capacity and reduction kinetics of the prepared biochar composite briquette (BCB) under simulated blast furnace (BF) conditions were investigated. The coke saving effect of charging BCB was analyzed by numerical simulation. Results showed that the prepared BCB was with a chemical composition of 0.77 wt% metallic iron, 72.59 wt% magnetite, 11.25 wt% wustite, 4.66 wt% gangue, and 11.10 wt% carbon. BCB could keep a crushing strength after partial reaction of more than 1900 N/briquette under the simulated BF conditions. Model simulations indicated that for a BF with a productivity of 6250 ton hot metal (tHM)/day, a coke rate reduction of 20 kg/tHM could be realized by replacing 10% sinter with BCB and moreover, the status of the BF was negligibly influenced.
KeywordsBiochar Carbon composite briquette Blast furnace Coke rate reduction
The authors thank the National Natural Science Foundation of China for supporting this work (Project No. U1960205).
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