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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。
Based on the rotary hearth furnace process, the consolidation mechanism of the metallized pellets of vanadium-titanium magnetite was studied under laboratory simulation conditions. The effect of C / O, reduction temperature and reduction time on the metallization rate and compressive strength of pellets was discussed. The consolidation mechanism of metallized pellets was discussed. The results show that the compressive strength of vanadium-titanium magnetite metal pellets is mainly related to the number and morphology of metal iron phases and the size of pores in the metalized pellets. The size of the metalized pellet pores mainly depends on the carbon content And gangue formed slag relative to the filling of the pores inside the metalized pellet; the amount and morphology of the metal iron phase depends on the degree of reduction of the metalized pellets. With the increase of reduction temperature and the reduction time, the concentration of metallic iron phase in the metallized pellets increases, and the fluidity of the slag phase improves. As a result, the porosity of the pellet decreases and becomes smaller and the pellet strength increases.