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.

Production of Ferrosilicoaluminium from Aluminum Slag and Local Ore Via Carbothermic Reduction

2020 ◽  
Vol 835 ◽  
pp. 75-82
Author(s):  
Azza Ahmed ◽  
Hoda El-Faramawy ◽  
Saeed Ghali ◽  
Michel L. Mishreky
Keyword(s):  
Chemical Composition ◽  
Carbothermic Reduction ◽  
Reducing Agent ◽  
Arc Furnace ◽  
Complex Alloy ◽  
Mill Scale ◽  
Aluminum Dross ◽  
Submerged Arc Furnace ◽  
Submerged Arc

This paper deals with the possibility of obtaining FeSiAl complex alloy by carbothermic reduction in a submerged arc furnace using aluminum dross, mill scale and feldspar.Bench scale experiments are carried out to clarify the effect of different variants such as reducing agent, basicity, and mill scale content of the charge on the metallic yield and chemical composition of the produced alloy.It was possible to get FeSiAl alloy containing 22% Si and 18% Al. the results reveal that to obtain such alloy less than 20% mill scale must be involved in the charge and the coke with amount 1 stoichiometric must be used.

Study on the Fabrication and Properties of Ni-P Composite Coating

2013 ◽  
Vol 537 ◽  
pp. 265-268
Author(s):  
Zhao An ◽  
Ming Ya Li ◽  
Nian Hao Ge ◽  
Xiao Ying Li ◽  
Qiu Fan Li ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Phase Composition ◽  
Surface Morphology ◽  
Composite Coating ◽  
Electroless Deposition ◽  
Sample Surface ◽  
Reducing Agent ◽  
Experimental Results ◽  
Complexing Agent

In this paper, the method of electroless deposition of nickel-phosphorous composite coating on the sample surface is employed. The effect of the complexing agent ratio on the surface morphology and phase composition of nickel-phosphorus coating when the main salt and reducing agent concentration unchanged has been studied. The influence of heat treatment on properties and microstructure of coatings are also investigated. Experimental results show that in the case of salt and reducing agent concentration unchanged, complexing agent concentration has strong effect on the morphology of the coatings and the crystal structure of the composite coating. During heat treatment, the morphology of the composite coating changed significantly, and the hardness was improved a certain degree for all the samples, which is related to the precipitation of Ni3P.

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

scholarly journals Electroless deposition of Fe-Ni alloys from acidic and alkaline solutions using hypophosphite as a reducing agent

2019 ◽  
Vol 84 (11) ◽  
pp. 1199-1208
Author(s):  
Stojan Djokic ◽  
Zeljka Antic ◽  
Nada Djokic ◽  
Thomas Thundat
Keyword(s):  
Electroless Deposition ◽  
Amorphous Structure ◽  
Reducing Agent ◽  
Experimental Results ◽  
Alkaline Solutions ◽  
Acidic Solutions ◽  
Ni Alloys ◽  
Alkaline Conditions ◽  
Temperature Deposition ◽  
Hydrolysis Of

The deposition of Fe?Ni alloys from acidic and alkaline solutions, using hypophosphite as a reducing agent, is studied in this work. The experimental results confirm the autocatalytic nature of this process. The composition of alloys is practically independent of the temperature deposition. Fe?Ni alloys produced from acidic solutions contained less than 1% Fe. The amount of Fe in Fe?Ni alloys produced from alkaline solutions was estimated to be about 15 %. The deposition of Fe?Ni alloys was significantly faster in the alkaline than in the acidic solutions, due to more pronounced hydrolysis of Fe(II) and Ni(II) ions under the alkaline conditions. The Fe?Ni alloys produced from both acidic and alkaline solutions contain phosphorus and as such have amorphous structure.

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