不锈钢除尘灰竖炉碳砖熔融还原试验研究.pdfVIP

不锈钢除尘灰竖炉碳砖熔融还原试验研究 叶文成 史永林 (太钢技术中心，太原 030003) 摘 要 研究了不锈钢粉尘及转炉除尘灰物相组成，及 AOD 除灰尘为主要原料，焦粉为还原剂，水泥为粘结剂制 备的竖炉碳砖熔融还原影响因素及其在高温还原后显微结构。结果表明：(Fe+Ni)/Cr 及焦粉粒度对不锈粉尘碳砖还 原速率影响不大；在 1500℃条件下不锈钢除尘灰碳砖 20min 即被完全还原。显微结构分析显示，铬铁颗粒在碳砖 气孔边界生成。因此，适当提高不锈钢除尘灰碳砖气孔率可提高碳砖反应速率。 关键词 不锈钢除灰尘 竖炉 碳砖 熔融还原 显微结构 Study on Smelting Reduction of OxyCup Carbonaceous Bricks Made of Stainless Steelmaking Dust1 Ye Wencheng Shi Yonglin ( TISCO Technology Center，Taiyuan 030003 ) Abstract The paper has studied on phase composition of stainless steelmaking dust and converter dust, influencing factors of smelting reduction in OxyCup carbonaceous bricks which are made of AOD dust as chief material, coke powder as reducing agent and cement as bond. And microstructure of the carbonaceous bricks reduced at high temperatures. The results show that: the influence of (Fe+Ni)/Cr and coke powder of different mesh sizes on reducing rate of the bricks is pimping. The bricks have been reduced sufficiently at 1500 ℃ in 20 minutes. And microstructure analysis indicates that it generates ferrochromium particles at the boundary of pores. Therefore, it is advantage to improve the reduction rate by increasing the porosity of carbonaceous bricks properly. Key words stainless steelmaking dust, oxycup, carbonaceous bricks, smelting reduction, microstructure 1 引言 太钢是集铁矿采掘和钢铁生产、加工、配送、贸易为一体的特大型钢铁联合企业，也是目前全球最大、 工艺技术装备水平最高、品种规格最全的不锈钢企业，具备年产 1000 万吨钢（其中 300 万吨不锈钢）的能 力。在不锈钢生产过程中产生大量的不锈钢除尘灰，约占钢铁产量 5%，其中含有多种重金属[1,2] 。采用直接 还原法回收不锈钢除尘灰存在铬还原回收率不高等问题[3] 。而将不锈除尘灰压制成含碳球团加入炼钢炉利 用，铬回收率不稳定[4]，且使用过程中扬尘严重，利用量也较小，不能完全回收处理不锈除尘灰。此外，我