Production of low-silicon molten iron from high-silica hematite using biochar

A new method of utilizing high-silica hematite to produce low-silicon molten iron was proposed.In this method,FASTMELT,which comprised direct reduction and melt separation processes,was applied,with highly reactive biochar as the reductant in the direct reduction stage.The proposed method was experi...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 24; no. 1; pp. 27 - 33
Main Authors Tang, Hui-qing, Fu, Xiu-feng, Qin, Yan-qi, Zhao, Shi-yu, Xue, Qing-guo
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 2017
Springer Singapore
Subjects
Applied and Technical Physics
Biochar
Direct reduction
Engineering
High-silica hematite
Low-silicon molten iron
Machines
Manufacturing
Materials Engineering
Materials Science
Melt separation
Metallic Materials
Physical Chemistry
Processes
二氧化硅颗粒
低硅铁水
分离过程
生产
生物炭
直接还原
硅铁矿
金属化率
Low-silicon molten iron
Direct reduction
Melt separation
High-silica hematite
Biochar
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Summary:A new method of utilizing high-silica hematite to produce low-silicon molten iron was proposed.In this method,FASTMELT,which comprised direct reduction and melt separation processes,was applied,with highly reactive biochar as the reductant in the direct reduction stage.The proposed method was experimentally investigated and the results show that the method is feasible.In the direct reduction stage,ore-char briquette could achieve a metallization rate of 84%-88% and residual carbon of 0.27-0.89mass% at temperature of 1373 K,biochar mixing ratio of 0.8-0.9,and reduction time of 15 min.Some silica particles remained embedded in the iron phase after the reduction.In the melting separation stage,molten iron with a carbon content of 0.02-0.03mass% and silicon content of 0.02-0.18mass%could be obtained from the metallic briquettes under the above-mentioned conditions;the iron recovery rate was83%-91% and impurities in the obtained metal were negligible.
Bibliography:A new method of utilizing high-silica hematite to produce low-silicon molten iron was proposed.In this method,FASTMELT,which comprised direct reduction and melt separation processes,was applied,with highly reactive biochar as the reductant in the direct reduction stage.The proposed method was experimentally investigated and the results show that the method is feasible.In the direct reduction stage,ore-char briquette could achieve a metallization rate of 84%-88% and residual carbon of 0.27-0.89mass% at temperature of 1373 K,biochar mixing ratio of 0.8-0.9,and reduction time of 15 min.Some silica particles remained embedded in the iron phase after the reduction.In the melting separation stage,molten iron with a carbon content of 0.02-0.03mass% and silicon content of 0.02-0.18mass%could be obtained from the metallic briquettes under the above-mentioned conditions;the iron recovery rate was83%-91% and impurities in the obtained metal were negligible.
11-3678/TF
High-silica hematite; Low-silicon molten iron; Biochar; Direct reduction; Melt separation
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(17)30005-5