Fluidized roasting reduction kinetics of low-grade pyrolusite coupling with pretreatment of stone coal

2013 ◽  
Vol 20 (3) ◽  
pp. 221-227 ◽  
Author(s):  
Ya-li Feng ◽  
Zhen-lei Cai ◽  
Hao-ran Li ◽  
Zhu-wei Du ◽  
Xin-wei Liu
Keyword(s):  
Low Grade ◽  
Reduction Kinetics ◽  
Stone Coal ◽  
Kinetics Of

scholarly journals Optimization of Oxidative Leaching for Vanadium Extraction from Low-Grade Stone Coal Using Response Surface Methodology

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1534
Author(s):  
Zulv Huang ◽  
Tao Chen ◽  
Yang Zhou ◽  
Wenbin Xu ◽  
Hanzhi Lin ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Low Grade ◽  
Stone Coal ◽  
H2so4 Concentration ◽  
Before And After ◽  
Shrinking Core ◽  
Oxidative Leaching ◽  
Kinetics Of ◽  
Central Composite

The feasibility and kinetics of vanadium (V) recovery from oxidative leaching of low-grade stone coal using MnO2 were investigated. Oxidative leaching processes (OLPs) were designed using response surface methodology (RSM) based on the central composite design (CCD) model. The results show that the order of factors that influence OLPs is leaching temperature > H2SO4 concentration > leaching time > MnO2 dosage. The interaction between leaching temperature and H2SO4 concentration on the OLP is the most significant. Vanadium leaching efficiency was 89.3% using 31% H2SO4 and 3% MnO2 at 90 °C for 7.9 h. The kinetics of V leaching from stone coal show that the leaching rate is controlled by chemical reaction through a layer according to the shrinking core model and the activation energy is 55.62 kJ/mol. A comparison of the SEM-EDS results of minerals before and after leaching confirms that the muscovite structure was significantly destroyed and V and aluminum (Al) were effectively dissolved during the OLP.

Reduction Kinetics of Low Grade Hematite Ore

2012 ◽  
pp. 129-135
Author(s):  
Yongzhong Xiao ◽  
Zhen He ◽  
Tiejun Chun ◽  
Deqing Zhu ◽  
Jian Pan
Keyword(s):  
Low Grade ◽  
Reduction Kinetics ◽  
Hematite Ore ◽  
Kinetics Of

Effect of H2O Partial Pressure on Reduction Kinetics of Iron-Based Fischer-Tropsch Catalyst

2010 ◽  
Vol 31 (2) ◽  
pp. 205-212
Author(s):  
Hong WANG ◽  
Yong YANG ◽  
Baoshan WU ◽  
Jian XU ◽  
Hulin WANG ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Reduction Kinetics ◽  
Fischer Tropsch ◽  
Iron Based ◽  
Kinetics Of

Carbothermic reduction kinetics of nanocrystallite Fe2O3/NiO composites for the production of Fe/Ni alloy

2008 ◽  
Vol 463 (1-2) ◽  
pp. 585-590 ◽  
Author(s):  
K.S. Abdel-Halim ◽  
M.H. Khedr ◽  
M.I. Nasr ◽  
M.Sh. Abdel-wahab
Keyword(s):  
Carbothermic Reduction ◽  
Reduction Kinetics ◽  
Ni Alloy ◽  
Kinetics Of
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