Thermogravimetric study on carbothermic reduction of chromite ore under non-isothermal conditions

2014 ◽  
Vol 42 (6) ◽  
pp. 409-416 ◽  
Author(s):  
X. Hu ◽  
L. Sundqvist. Ökvist ◽  
Q. Yang ◽  
B. Björkman
Keyword(s):  
Carbothermic Reduction ◽  
Chromite Ore ◽  
Isothermal Conditions ◽  
Thermogravimetric Study

Carbon in Solidphase Reduction of Oxides

2016 ◽  
Vol 870 ◽  
pp. 578-583
Author(s):  
A.V. Senin
Keyword(s):  
Active Carbon ◽  
Carbothermic Reduction ◽  
Reducing Agent ◽  
Experimental Results ◽  
Surface Porosity ◽  
Reduction Model ◽  
Chromite Ore ◽  
Reducing Conditions ◽  
Grain Surface ◽  
Reduction Of Oxides

The gasphase-solidphase model is used to explain the results of solid chromite ore carbothermic reduction. The reducing agent is carbon atoms. Carbon is brought to the surface of chromite grains by gaseous carbon-containing molecules and radicals, such as C3O2, CH4, CH3, CH2, CH, C2H2 and other carbon containing particles. Gas particles penetrate a piece of ore through the pores and cracks. Active carbon atoms C are formed by the dissociation of gaseous particles. Reduction by carbon is carried out on the chromite grain surface due to the cations and anions diffusion in the oxide lattice towards the grain surface. Porosity of chromite ores is experimentally defined under reducing conditions; it is estimated at up to 20 – 25 vol.%. Up to 1/4 of porosity is accounted for macropores and macrocracks that have the radius of over 50 microns, the remaining porosity share is accounted for the pore dimensions that are estimated at 0.5 – 50 microns in radius. The carbon presence in the pores of partially reduced ores is deduced based on experiment. There is also carbon in the reduced metal that is situated deep in the lump ore. The experimental results agree with the gasphase-solidphase reduction model.

Thermal Analysis Study on the Carbothermic Reduction of Chromite Ore with the Addition of Mill Scale

2015 ◽  
Vol 87 (5) ◽  
pp. 562-570 ◽  
Author(s):  
Xianfeng Hu ◽  
Qixing Yang ◽  
Lena Sundqvist Ökvist ◽  
Bo Björkman
Keyword(s):  
Thermal Analysis ◽  
Carbothermic Reduction ◽  
Analysis Study ◽  
Mill Scale ◽  
Chromite Ore ◽  
Thermal Analysis Study

Carbothermic Reduction of Chromite Ore Under Different Flow Rates of Inert Gas

2009 ◽  
Vol 41 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Dolly Chakraborty ◽  
S. Ranganathan ◽  
S.N. Sinha
Keyword(s):  
Carbothermic Reduction ◽  
Inert Gas ◽  
Flow Rates ◽  
Chromite Ore

scholarly journals A THERMOGRAVIMETRIC STUDY OF REDUCTION OF SILVER OXIDE UNDER NON-ISOTHERMAL CONDITIONS

2010 ◽  
Vol 1 (2) ◽  
pp. 144-150 ◽  
Author(s):  
D. Jelić ◽  
S. Mentus ◽  
J. Penavin-Škundrić ◽  
D. Bodroža ◽  
B. Antunović
Keyword(s):  
Silver Oxide ◽  
Isothermal Conditions ◽  
Thermogravimetric Study
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