Nonisothermal Reduction Kinetics in the Fe-Cu-O System Using H2

Based on the density functional theory, the geometric structure, adsorption energy and density of states of H 2 /α-Fe 2 O 3 (001) system and (H 2 + Ni)/α-Fe 2 O 3 (001) system were determined. The results showed that the absolute value of adsorption energy between H 2 molecule and α-Fe 2 O 3 (001) surface and the bond length of H 2 molecule were increased by the presence of Ni atom. The presence of Ni atom promotes the adsorption of H 2 molecule on α-Fe 2 O 3 (001) surface. Reduction behavior of iron and nickel oxides in H 2 atmosphere was determined by thermogravimetric analysis. The samples included Fe 2 O 3 , Fe 2 O 3 -NiO and Fe 2 O 3 -Ni systems. The effect of Ni and NiO on the reduction behavior of Fe 2 O 3 was investigated. The ease of reduction within the following three systems decreases sequentially: Fe 2 O 3 -Ni > Fe 2 O 3 -NiO > Fe 2 O 3 . The activation energy of Fe 2 O 3 -Ni, Fe 2 O 3 -NiO and Fe 2 O 3 systems at two temperature stages (viz. < 400 • C and > 400 • C) were 172 kJ·mol −1 , 197 kJ·mol −1 and 263 kJ·mol −1 respectively.

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“…Study on kinetics of reduction process by thermal analysis [22][23][24], the kinetic equation under non-isothermal conditions is obtained.…”

Section: Kinetic Approachmentioning

confidence: 99%

Combined Density Functional Theory and Reduction Kinetics Investigation of Enhanced Adsorption of Hydrogen onto Fe2O3 by Surface Modification with Nickel

Zhang

Wei

et al. 2019

Metals

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“…H 2 deoxidation is widely used in the smelting of copper [18][19][20] and titanium alloys [21]. The use of H 2 to improve the efficiency of C deoxidation for the smelting of ultra-low carbon steel [22][23][24], and the use of Ar and H 2 plasma arc melting to remove oxygen and sulphur in liquid iron has been investigated [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic model and mechanism of non-alloyed hydrogen deoxidation of GCr15 bearing steel

Lei

Zhu

Guo

et al. 2022

Ironmaking & Steelmaking

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A new method of non-alloyed hydrogen deoxidation is proposed, and the hydrogen deoxidation of GCr15 is studied using thermodynamic modelling. Deoxidation by blowing hydrogen is dominated by hydrogen molecular, and the degree of deoxidation depends on p H2O p H2 , which is independent of [H]. Carbon and hydrogen will compete for deoxidation during the blowing of hydrogen. The deoxidation mode depends on the relationship between the actual p H2O p H2 and the critical p H2O p H2 . The system pressure has a great influence on the carbon / hydrogen deoxidation equilibrium. Under vacuum conditions, carbon has a stronger deoxidation ability than hydrogen. Finally, a new process for hydrogen deoxidation was proposed. In the later stage of converter smelting, hydrogen was blown to reduce the excess oxygen → tapping, and hydrogen was blown to alternate deoxidation of carbon and hydrogen → sufficient carbon powder was added into the ladle → RH treatment, and hydrogen was stopped to blown, and carbon deoxidation occurred.

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“…Heo et al recovered iron from slag and the Fe recovery was about 90 wt.% [ 15 ]. Zhang et al studied the reduction of the oxide system of iron and copper using hydrogen, with no investigation into metal recovery [ 16 ]. Few researchers focus on both copper and iron extraction.…”

Section: Introductionmentioning

confidence: 99%

Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy

Zhang

Feng²,

Zhang³

2022

Materials

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In order to realize the high-value utilization of copper slag, a process for preparing Cu–Fe alloy through the reduction of copper slag is proposed. The sulfur in the alloy exists in the form of matte inclusions, which is different from sulfur in molten iron. The reaction of CaO with Cu2S is difficult. It is necessary to add a reducing agent to promote desulfurization. To avoid the introduction of other elements, Fe‒Mn and CaC2 additions were used as desulfurizers for the desulfurization of Cu‒Fe alloy. The thermodynamics of the desulfurization reaction were calculated and the experimental process was studied. It was found that the Gibbs free energy of desulfurization reactions was negative for Fe‒Mn and that CaC2 can reduce the sulfur in the alloy to 0.0013% and 0.0079%, respectively. The desulfurization process affected the shape of copper in the alloy. Part of copper in this alloy exists in the form of nano-copper spheres, and the size of the spheres is found to increase after desulfurization. Reducing agents can facilitate the desulfurization process of stable sulfides.

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Nonisothermal Reduction Kinetics in the Fe-Cu-O System Using H2

Cited by 5 publications

References 21 publications

Combined Density Functional Theory and Reduction Kinetics Investigation of Enhanced Adsorption of Hydrogen onto Fe2O3 by Surface Modification with Nickel

Combined Density Functional Theory and Reduction Kinetics Investigation of Enhanced Adsorption of Hydrogen onto Fe2O3 by Surface Modification with Nickel

Thermodynamic model and mechanism of non-alloyed hydrogen deoxidation of GCr15 bearing steel

Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy

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