摘要
基于生物炭相较于传统煤炭能源具有含氢量多、含碳量少、含氧量多、含硫量低等特点,本文研究了三种生物质焦-高铁赤泥复合球团的热还原机理,对比了三种生物质焦对球团金属化率、物相结构、微观形貌以及孔径的影响,得出以下结论。麦麸焦在复合球团金属化率、物相结构方面比其他两种生物质焦复合球团均有一定的优势,在1100℃下热还原2 h,金属化率达到86.5%,比冶金焦提高5.2%,远高于相同条件下松木焦复合球团与玉米焦复合球团;麦麸焦-高铁赤泥复合球团主要物相组成为金属铁(44.3%)、碳(10.6%)、钙铝黄长石(Ca_(2)Al_(2)SiO_(7))以及霞石(NaAlSiO_(4)),适用于涡流熔融还原炼铁工艺;麦麸焦-高铁赤泥复合球团气孔结构更为均匀,孔径约为2~4 nm,比表面积较大,整体结构较好,表面金属化程度更高,残余杂质较少。该研究结果对实现生物质资源高效利用具有重要的参考价值。
Based on the characteristics of biochar containing more hydrogen,less carbon,more oxygen,and lower sulfur compared with traditional coal energy,this study investigates the thermal reduction mechanism of three types of biomass char-high iron red mud composite pellets,and compares the effects of three biomass chars on metallization rate,phase structure,micromorphology,and pore size.The following conclusions were drawn.Wheat bran char exhibits superior performance in enhancing the metallization rate and optimizing the phase structure of the composite pellets compared to the other two biomass chars.After thermal reduction at 1100℃for 2 h,the metallization rate reaches 86.5%,which is 5.2%higher than that of metallurgical coke and much higher than those of pine wood char composite pellets and corn char composite pellets under the same conditions.The main phase compositions of wheat bran char-high iron red mud composite pellets are metallic iron(44.3%),carbon(10.6%),gehlenite(Ca_(2)Al_(2)SiO_(7)),and nepheline(NaAlSiO_(4)),making them suitable for the vortex melting reduction ironmaking process.The wheat bran char-high iron red mud composite pellets possess a more uniform pore structure with a pore size of approximately 2-4 nm,a larger specific surface area,a better overall structure,a higher degree of surface metallization,and fewer residual impurities.The research results provide important reference for the efficient utilization of biomass resources.
作者
苏思羽
刘燕
刘珈维
蔡震雷
张海明
张廷安
SU Siyu;LIU Yan;LIU Jiawei;CAI Zhenlei;ZHANG Haiming;ZHANG Ting′an(School of Metallurgy,Northeastern University,Shenyang 110819,China;Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education,Shenyang 110819,China)
出处
《中国有色冶金》
北大核心
2026年第1期155-161,共7页
China Nonferrous Metallurgy
基金
辽宁省自然科学基金联合基金面上项目(No.2023-MSBA-114)
第九届青托工程项目(No.2023QNRC001)
鞍钢绿色资源技术有限责任公司技术开发项目(No.AGLYKJZLZX-2024-01)。
关键词
高铁赤泥
麦麸焦
玉米秸秆焦
松木焦
复合球团
金属化率
气孔分布
high-iron red mud
wheat bran char
corn stalk char
pine wood char
composite pellets
metallization rate
pore size distribution
