scholarly journals Systematic study on separation of Mn and Fe from ferruginous manganese ores by carbothermic reduction roasting process: Phase transformation and morphologies

2019 ◽  
Vol 8 (6) ◽  
pp. 5591-5609 ◽  
Author(s):  
Lihua Gao ◽  
Zhenggen Liu ◽  
Yuzhu Pan ◽  
Cong Feng ◽  
Mansheng Chu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Systematic Study ◽  
Carbothermic Reduction ◽  
Reduction Roasting ◽  
Manganese Ores ◽  
Roasting Process

scholarly journals Carbothermic Reduction and Nitridation Mechanism of Vanadium-Bearing Titanomagnetite Concentrate

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 730
Author(s):  
Wen Yu ◽  
Xiaojin Wen ◽  
Wei Liu ◽  
Jiangan Chen
Keyword(s):  
Phase Transformation ◽  
Carbothermic Reduction ◽  
Titanium Oxides ◽  
Distribution Characteristic ◽  
Reaction Behavior ◽  
Microstructure Transformation ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Roasting Process ◽  
Rate Limiting

In this study, the carbothermic reduction and nitridation mechanism of vanadium-bearing titanomagnetite concentrate are investigated in terms of phase transformation, microstructure transformation, and thermodynamic analyses. The differences in the reaction behavior of titanomagnetite and ilmenite in vanadium-bearing titanomagnetite concentrate, as well as the distribution characteristic of V in the roasted products, are emphatically studied. It is observed that the reaction sequences of titanomagnetite and ilmenite transformations into nitride are as follows: Fe3−xTixO4→Fe2TiO4→FeTiO3→M3O5→(Ti, V)(N, C); FeTiO3→M3O5→Ti(N, C). The reduction of M3O5 to TiN is the rate-limiting step of the entire reaction, and metal iron is an important medium for transferring C for the reduction of M3O5. Titanomagnetite is faster to convert into nitride than ilmenite is, and the reasons for this are discussed in detail. During the entire roasting process, V mainly coexists with Ti and seems to facilitate the conversion of titanium oxides into (Ti, V)(N, C).

New understanding on separation of Mn and Fe from ferruginous manganese ores by the magnetic reduction roasting process

2018 ◽  
Vol 444 ◽  
pp. 133-144 ◽  
Author(s):  
Bingbing Liu ◽  
Yuanbo Zhang ◽  
Juan Wang ◽  
Jia Wang ◽  
Zijian Su ◽  
...  
Keyword(s):  
Reduction Roasting ◽  
Manganese Ores ◽  
Roasting Process

scholarly journals Volatilization behavior of tin during carbothermic reduction of tin-bearing middling to recover tin

2018 ◽  
Vol 54 (3) ◽  
pp. 419-426
Author(s):  
J. Jing ◽  
Y. Guo ◽  
F. Chen ◽  
F. Zheng ◽  
L. Yang
Keyword(s):  
Carbothermic Reduction ◽  
Reducing Agent ◽  
Reduction Temperature ◽  
Reduction Roasting ◽  
Thermodynamics And Kinetics ◽  
Roasting Process ◽  
Reduction Efficiency ◽  
Reaction Capability ◽  
Coke Powder ◽  
Volatilization Behavior

A new method for selecting reducing agent was proposed in this study. This study dedicated to recovery of tin from tinbearing middling by carbothermic reduction. Volatilization behavior of tin during carbothermic reduction was systematically studied, including the tin volatilization thermodynamics and kinetics, the selecting method of reducing agent, the effects of reducing agent, reduction temperature and effect of time on the tin volatilization rate. The thermodynamic results showed that the SnO2 was reduced to SnO by controlling CO% in the range of 9%~15%, and then volatilized as SnO. The reduction efficiency and the reaction capability with CO2 of three reducing agent were investigated, which indicated tin volatilization was close in nature to the reductant, and it was beneficial to the volatilization by using the coke powder. The experiment results show that the volatilization ratio of tin can reach more than 81.34% when the coke powder is used as the reducing agent at 900?C for 2h. The kinetic of tin volatilization during the reduction roasting process showed that the reaction was controlled by the interface chemical reaction and the activation energy of the reaction was 44.66 kJ/mol.

scholarly journals Influence of Hydrofluoric Acid Leaching and Roasting on Mineralogical Phase Transformation of Pyrite in Sulfidic Mine Tailings

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 513 ◽  
Author(s):  
Babak Koohestani ◽  
Ahmad Khodadadi Darban ◽  
Pozhhan Mokhtari ◽  
Esmaeel Darezereshki ◽  
Erol Yilmaz ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Phase Transformation ◽  
Iron Oxides ◽  
Mine Tailings ◽  
Hydrofluoric Acid ◽  
Surface Characterization ◽  
Acid Leaching ◽  
Roasting Process ◽  
Pyrite Content ◽  
Mineralogical Phase

Under the oxidative roasting process, pyrite, as a major mineral in sulfidic mine tailings, can transform to iron oxides. Generated iron oxides, if exhibiting enough magnetic properties, can be recovered via magnetic separation resulting in partial mine tailings valorization. However, due to the presence of various minerals and sintering possibility, it is advantageous to remove impurities and increase the pyrite content of mine tailings prior to the roasting procedure. In this case, hydrofluoric acid that has no influence on pyrite can be used to leach most inorganic minerals, including aluminosilicates. Therefore, this study investigated and compared the influence of the roasting process with and without hydrofluoric acid leaching pretreatment on mineralogical phase transformation of pyrite and magnetic properties of thermally generated minerals. Several tests and analyses were performed to study mineralogical phase transformation, morphology, elemental composition, surface characterization, and magnetic properties. Results of this study indicated that without acid leaching pretreatment, pyrite was mainly transformed to hematite. However, via acid leaching, fluorine, as a more electronegative element over oxygen, entered the compound and neglected the role of oxygen in thermal oxidation, instead reducing sulfur content of pyrite to only form pyrrhotite.

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