酸性护炉球团矿焙烧工艺及固结机理

来源期刊：中南大学学报(自然科学版)2000年第6期

论文作者：朱德庆 潘润润 姜涛 郭宇峰 杨永斌 邱冠周

文章页码：489 - 492

关键词：高炉护炉;钒钛磁铁矿;氧化焙烧;护炉球团矿;炉料结构

Key words：protection of blast furnace; vanadium bearing titanomagnetite; oxidatively firing; ATB pellets; burden structurt

摘    要：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 95 0℃ ,15min和 12 0 0℃ ,15min时制取的酸性含钛护炉氧化球团矿 ,其品位为TFe 58.56%、TiO₂ 7.89% ,机械强度为 3127N/个 ,主要冶金性能指标为RI 70.8% ,RDI_-3.157.29% ,SI 15.27% ,软熔温度区间为 10 80～ 1170℃ ,可满足大中型高炉的冶炼和护炉要求 ;固结机理为Fe₂ O₃ 再结晶和固相扩散固结 ,与普通铁矿氧化球团相同 .本工艺不仅有利于延长高炉寿命和调整炉料结构 ,而且也为合理利用钒钛磁铁矿开辟了有效途径 .

Abstract: An investigation into the process parameters and induration mechanism of thermal hardening for making acid titanium bearing pellets were carried out. It has been revealed that under the conditions of preheating at 950 ℃, roasting at 1 200 ℃ and durations of preheating and roasting respectively for 15 minutes, acid titanium bearing oxide pellets assaying total Fe 58.56% and TiO₂ 7.89% were manufactured successfully. The compressive strength reaches 3127 Newton 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 needs of protection and a charge for large and middle scale blast furnaces. Like that of ordinary pellets from magnetite concentrates, the induration of titanium bearing pellets depends on the recrystallization and solid phase diffusion of hematite. The making of the acid titanium bearing pellets is not only favorite to prolonging campaign life and modifying the burden structure of blast furnace, but also finds an effective way for utilization of vanadium titanomagnetite concentrate.