高磷铁矿生物质烧结过程中磷的气化行为  

Phosphorus Gasification Behavior of High-phosphate Iron Ore During Biomass Sintering

作　　者：索延帅[1] 胡启晨 郭豪[1] 段国建[1] 左海滨 陈衍彪 Suo Yanshuai;Hu Qichen;Guo Hao;Duan Guojian;Zuo Haibin;Chen Yanbiao(Capital Engineering&Research Incorporation Ltd.,Beijing 100176,China;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中冶京诚工程技术有限公司,北京100176 [2]钢铁冶金新技术国家重点实验室,北京100083

出　　处：《山西冶金》2023年第11期3-8,共6页Shanxi Metallurgy

基　　金：中国五矿科技专项计划项目(2020ZXA01);创新方法在城市友好型钢铁与建筑业应用模式研究与示范(2020IM020500)。

摘　　要：基于我国高磷铁矿资源丰富,但由于其较高的磷含量及复杂的矿相结构难以选别,导致其未能充分利用,提出了生物质烧结过程中进行磷的气化脱除方法,研究了不同还原条件下磷的还原行为。结果表明在木炭配加比例为30%,碱度为0.5,还原时间为60 min时,得到了磷气化脱除的最佳工艺条件,相应的脱磷率为27.12%。与全焦粉相比,添加木炭替代部分焦粉能促进磷灰石的还原,提高气化脱磷率。随着碱度的降低和还原时间的增加,金属铁和磷灰石被还原完全,还原过程中存在着铁和磷的选择性还原,铁氧化物优先于磷灰石的还原,部分磷气体进入金属铁中形成磷化铁。因此,还原过程尽量避免液相铁生成是提高脱磷率的关键。China is rich in high-phosphorus iron ore resources,but it is not fully utilized because of its high phosphorus content and complex mineral phase structure.It is an inevitable choice for China's iron and steel resources strategy to develop innovative technologies to efficiently utilize refractory high-phosphorus iron ore.Based on this,the method of phosphorus gasification in biomass sintering process was put forward.In this paper,the reduction behavior of phosphorus under different reduction conditions was studied.The results showed that when the proportion of charcoal was 30%,the alkalinity was 0.5,and the reduction time was 60 min,the best process conditions for phosphorus gasification removal were obtained,and the corresponding dephosphorization rate was 27.12%.Compared with full coke powder,the addition of charcoal instead of partial coke powder could promote the reduction of apatite and improve the gasification dephosphorization rate.With the decrease of alkalinity and the increase of reduction time,metal iron and apatite were reduced completely,and there was selective reduction of iron and phosphorus in the reduction process.Iron oxide takes precedence over the reduction of apatite,and part of phosphorus gas enters the metal iron to form iron phosphide.Therefore,avoiding the formation of liquid iron in the reduction process was the key to improve the dephosphorization rate.

关 键 词：生物质烧结 气化脱磷 木炭配比 碱度 还原时间 

分 类 号：TF04[冶金工程—冶金物理化学]