摘要
高磷鲕状赤铁矿的还原对磁选分离起着重要作用,为鲕状赤铁矿合理利用开发提供理论依据。以高磷鲕状赤铁矿为原料、H2为还原剂,研究添加CaO对高磷鲕状赤铁矿还原的影响。研究结果表明,温度为1 100℃、碱度为1.0时,金属化率达到92.05%。XRD、SEM-EDS分析表明,添加CaO使绝大部分铁氧化物被还原为金属铁,有效促进铁橄榄石（Fe2SiO4）、铁尖晶石（FeAl2O4）还原成铁,金属铁颗粒中的杂质组分降低。动力学结果表明,原矿温度为800～1 100℃时符合未反应核模型,未添加CaO原矿表观活化能为49.16 kJ/mol,添加CaO原矿表观活化能为56.46 kJ/mol。两还原过程都受气体扩散控制。
The reduction of the high phosphorus oolitichematite played an important role in subsequent magnetic separation. To provide theoretical basis for the rational utilization and development of oolitic hematite. The high phosphorus oolitic hematite was used as the raw material,H2 was the reducing agent. The effect of adding CaO in the reduction of highphosphorus oolitic hematite was studied. The results showed that when the temperature was 1 100 ℃ and the alkalinity was 1.0,the metallization rate was 92.05%. The XRD,SEM-EDS analysis showed that adding CaO makes most of the iron oxides reduced to metal iron,and the CaO effectively promoted the reduction of fayalite（Fe2 SiO4）and spinel（FeAl2 O4）into iron and the reduction of impurity components of metallic iron particles. The kinetic calculation results showed that the ore was in correspondence with the nuclear reaction model at 800-1 100 ℃. The apparent activation energy of ore was 49.16 kJ/mol and that of adding CaO ore is 56.46 kJ/mol. Both the two reduction processes are controlled by gas diffusion.
作者
张凡
黄润
李明明
吕晓东
张金柱
ZHANG Fan;HUANG Run;LI Ming-ming;LV Xiao-dong;ZHANG Jin-zhu(School of Materials and Metallurgy,Guizhou University,Guiyang 550025,Guizhou,China;Laboratory Metallurgical Engineering and Energy Saving Process of Guizhou Province,Guiyang 550025,Guizhou,China)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第11期8-13,40,共7页
Iron and Steel
基金
国家自然科学基金资助项目(51274074,51664003)
关键词
高磷鲕状赤铁矿
氧化钙
强化还原
金属铁颗粒
动力学
high phosphorus oolitic hematite
calcium oxide
enhanced reduction
metal iron particle
dynamics
作者简介
张凡（1994_），男，硕士生；E-mail：ZF13886974263@163．com;通讯作者：张金柱（1956-），男，博士，教授；E-mail：jin-zhu-zhang@yeah．net
