钒钛磁铁矿金属化球团固结机理研究

Study on Bonding Mechanism of Vanadium Titano-magnetite Metalized Pellets

以转底炉工艺为基础,在实验室模拟条件下,研究了钒钛磁铁矿金属化球团的固结机理。讨论了配碳量(C/O)、还原温度、还原时间对球团金属化率和抗压强度的影响,确定了金属化球团的固结机理。研究发现:钒钛磁铁矿金属化球团的抗压强度主要与金属铁相的数量和形态以及金属化球团内孔隙的大小有关;金属化球团孔隙的大小主要取决于配碳量高低和脉石所形成的渣相对金属化球团内部孔隙的填充状态;金属铁相的数量和形态则取决于金属化球团的还原程度。随着还原温度升高和还原时间延长,金属化球团内部金属铁相密集度增加,渣相流动性改善,从而导致金属化球团孔隙减少且变小,球团强度增加。

Under the condition of laboratory simulation, the bonding mechanism of vanadium titano-magnetite metalized pellets was studied based on rotary hearth furnace process was studied. Effects of C/O （carbon/oxygen） mol ratio, reduction temperature and reduction time on metallization ratio and compressive strength of the pellets were discussed, and the bonding mechanism of metalized pellet was determined. The results show that the compressive strength of vanadium titano-magnetite metalized pellets is mainly related to the shape and amount of iron phase as well as size of pores in metalized pellets. The size of pores in rnetalized pePtet depends on C/O （carbon/oxygen） moI ratio and filhng condition of slag phase to pores in pellets. The amount and shape of iron phase are decided by the reduction degree of metalized pellet. With the reduction temperature rise and long reduction time, the metal iron phase conglomeration in metalized pellets increases, the slag phase fluidity improves, thus the amount of pores of metalized pellets reduces, and pores become smaller and pellet strength increases.