Effect of B2O3 addition on oxidation induration and reduction swelling behavior of chromium-bearing vanadium titanomagnetite pellets with simulated coke oven gas

B2O3对含铬型钒钛磁铁矿球团氧化固结及在喷吹焦炉煤气时还原膨胀行为的影响（英文）

The oxidation induration and reduction swelling behavior of the chromium-bearing vanadium titanomagnetite pellets (CVTP) with B2O3 addition were investigated. Besides, the reduction swelling index (RSI) and compressive strength (CS) of the reduced CVTP were also examined using the simulated coke oven gas (COG). The results suggested that the CS of CVTP was increased from 2448 to 3819.2 N, while the porosity of CVTP was decreased from 14.86% to 10.03% with the increase in B2O3 addition amounts. Moreover, the B2O3 mainly existed in the forms of TiB0.024O2 and Fe3BO5 in both CVTP and the reduced CVTP. Specifically, the CS of the reduced CVTP was elevated from 901 to 956.2 N, while the RSI was reduced from 5.87% to 3.81% as the B2O3 addition amounts were increased. Taken together, B2O3 addition would facilitate the aggregation and diffusion of metallic iron particles, which contributed to reducing the formation of metal iron whiskers and weakening the reduction swelling behavior.

研究B2O3对含铬型钒钛磁铁矿球团氧化固结和还原膨胀行为的影响。在模拟喷吹焦炉煤气的条件下,研究球团还原膨胀指数和抗压强度。结果表明,随着B2O3含量的提高,球团的抗压强度从2448 N增至3819.2 N,而孔隙率从14.86%降至10.03%。添加的B2O3主要以TiB0.024O2和Fe3BO5的形式存在于氧化球团和还原球团中。随着B2O3含量的提高,还原球团的抗压强度从901 N提高至956.2 N,还原膨胀指数从5.87%降低至3.81%。B2O3能促进金属铁的聚集和扩散,抑制铁晶须的形成,并降低还原膨胀行为。