scholarly journals Melting Separation Behavior and Mechanism of High-chromium Vanadium–bearing Titanomagnetite Metallized Pellet Got from Gas-based Direct Reduction

2016 ◽  
Vol 56 (2) ◽  
pp. 210-219 ◽  
Author(s):  
Jue Tang ◽  
Mansheng Chu ◽  
Cong Feng ◽  
Yating Tang ◽  
Zhenggen Liu
Keyword(s):  
Direct Reduction ◽  
High Chromium ◽  
Metallized Pellet ◽  
Melting Separation ◽  
Separation Behavior

scholarly journals The Preparation of High-Purity Iron (99.987%) Employing a Process of Direct Reduction–Melting Separation–Slag Refining

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1839
Author(s):  
Bin Li ◽  
Guanyong Sun ◽  
Shaoying Li ◽  
Hanjie Guo ◽  
Jing Guo
Keyword(s):  
High Purity ◽  
Pure Iron ◽  
Large Scale ◽  
Direct Reduction ◽  
Low Cost ◽  
Direct Reduced Iron ◽  
Slag Refining ◽  
Melting Separation ◽  
Purity Iron ◽  
High Purity Iron

In this study, high-purity iron with purity of 99.987 wt.% was prepared employing a process of direct reduction–melting separation–slag refining. The iron ore after pelletizing and roasting was reduced by hydrogen to obtain direct reduced iron (DRI). Carbon and sulfur were removed in this step and other impurities such as silicon, manganese, titanium and aluminum were excluded from metallic iron. Dephosphorization was implemented simultaneously during the melting separation step by making use of the ferrous oxide (FeO) contained in DRI. The problem of deoxidization for pure iron was solved, and the oxygen content of pure iron was reduced to 10 ppm by refining with a high basicity slag. Compared with electrolytic iron, the pure iron prepared by this method has tremendous advantages in cost and scale and has more outstanding quality than technically pure iron, making it possible to produce high-purity iron in a short-flow, large-scale, low-cost and environmentally friendly way.

Research on the melt behavior of rare-earth-rich iron minerals by direct reduction

2020 ◽  
Vol 117 (1) ◽  
pp. 118
Author(s):  
Wentao Guo ◽  
Zhi Wang ◽  
Zengwu Zhao ◽  
Wenfeng Wang
Keyword(s):  
Rare Earth ◽  
Phase Structure ◽  
Carbothermic Reduction ◽  
Direct Reduction ◽  
Graphite Crucible ◽  
Reduction Degree ◽  
Mineral Phase ◽  
Iron Mineral ◽  
P Content ◽  
Melting Separation

The evolution of mineral phase structure during the reduction and melting separation of an rare earth (RE)-rich iron mineral (RER-IM) is investigated. The results show the iron oxides are reduced to their metallic iron or FeO at 1373 K. When reduction time is 180 min, the reduction degree is 84%. Both bastnaesite (RE(CO3)F) and monazite (REPO4) are transformed into Ca2RE8(SiO4)6O2 during carbothermic reduction at 1373 K. The mineral with a reduction degree of 84% is melt-separated in a graphite crucible at 1773 K for 20 min, the resulting slag contains 20.64% RE2O3, with RE existing in the form of Ca2RE8(SiO4)6O2. Moreover, P from the reduction of Ca3(PO4)2 dissolves in iron with a content ranging from 1.2 to 2.21%. The type of RE phase that occurs in the slag is related to the distribution of P between slag and iron. A low P content in the slag facilitates the formation of Ca2RE8(SiO4)6O2, but a high content in the slag favours Ca3RE2[(Si, P)O4]3F. Thus, it is confirmed that the RE phase structure is controlled by the distribution of P between slag and iron.

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