酸性护炉球团矿焙烧工艺及固结机理

研究了新型炉料酸性含钛护炉球团矿的焙烧工艺及固结机理，结果表明利用钒钛磁铁精矿和普通磁铁精矿的混合矿在预热和焙烧条件分别为950℃，15min和1200℃，15min时制取的酸性含钛护炉氧化球团矿，其品位为TFe58．56％、TiO

Thermal hardening of acid titanium-bearing pellets toprolong campaign life of blast furnace

An investigation into the process parameters and induration mechanism of thermal hardening for making acidtitanium-bearing pellets were carried out. It has been revealed that under the conditions of preheating at 950 ℃, roastingat 1 200℃ and durations of preheating and roasting respectively for 15 minutes, acid titanium-bearing oxide pellets as-saying total Fe 58.56% and TiO2 7.89% were manufactured successfully. The compressive strength reaches 3127 New-ton per pellet, their main metallurgical properties are as follows: RI 70.8%, RDI-3.15 7.29%, swelling index 15.27 %, pellet softening temperature range from beginning to finish at 1 080 ～ 1 170 ℃, all of which can meet the needsof protection and a charge for large and middle scale blast furnaces. Like that of ordinary pellets from magnetite concen-trates, the induration of titanium-bearing pellets depends on the recrystallization and solid phase diffusion of hematite.The making of the acid titanium-beating pellets is not only favorite to prolonging campaign life and modifying the burdenstructure of blast furnace, but also finds an effective way for utilization of vanadium titanomagnetite concentrate