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The Related Basic Research on Reduction with Controlled Oxygen Flow

Author: SongJianXin
Tutor: GaoYunMing
School: Wuhan University of Science and Technology
Course: Physical Chemistry of Metallurgy
Keywords: Zirconia Slag Diffusion coefficient Conductivity Controlled oxygen flow restored
CLC: TF55
Type: Master's thesis
Year: 2010
Downloads: 44
Quote: 0
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Abstract


Controlled oxygen flow reduction method is a green metallurgy method, emit oxygen at the anode can completely overcome restore traditional carbon-based emissions of the greenhouse gas CO 2 problem. The law is not only important in the establishment of new metallurgical processes, and a recovery of valuable metals from metallurgical slag new, higher value-added products can be obtained. This thesis is to restore a number of important parameters involved in the process of controlled oxygen flow experimental determination of study, and try to take advantage of controlled oxygen flow reduction technology to extract the metal iron from the slag containing FeO directly. The four-electrode method using a DC direct determination of the mass fraction of 2.18% MgO stabilized zirconia tube samples in air at 1473 1 873K within the scope of the conductivity change with temperature curve. The results showed that the 1473 1 873K within the heating process of the zirconia tube sample conductivity change of 2.0 × 10-2 ~ 5.0 × 10-1S? Cm-1. Conductivity versus temperature can be divided into three sections. 1473 1 673K, and 1773 1 873K temperature range, conductivity, temperature dependence of the Arrhenius formula; in 1673 , 1 773K transition range memory tetragonal to cubic phase transition, leading to a significant increase in electrical conductivity. 1873K under the conductivity up to 0.5 S? Cm-1, fully able to meet the requirements of controlled oxygen flow conductivity. Cylindrical in shape and zirconia-based solid electrolyte galvanic cell the: Pt_ air _ZrO 2 (MgO) _ [O] silver liquid _Ir, constant voltage method for the determination of the 1473-1773K silver liquid oxygen diffusion coefficient, as the temperature increases, the diffusion coefficient of the silver liquid oxygen becomes gradually large, and its relationship with the temperature as follows: (?) Preliminary experiments show that the use of the electrode lead can be obtained in the the lanthanum chromite rod for liquid iron more stable electrical signals. The comprehensive tester AC impedance spectrum of the signal applied to the slag four-electrode system PARSTAT2273 electrochemical determined CaO-SiO 2 - Al 2 O 3 -MgO-FeO-based slag in conductivity. Studied the frequency of the alternating current at room temperature, the electrode insertion depth, the solution depth and size of AC electrode eccentricity, inner and outer electrode spacing test conditions for test results. On this basis, the measurement results show that the conductivity of the slag, in any composition, the slag conductivity are increased with increasing temperature, and its relationship to the Arrhenius formula. With the increase of the concentration of FeO in slag, slag conductivity increases, and the temperature coefficient decreases, the conductivity activation energy decreases. To extract the metallic iron from the slag containing FeO, for example, using the zirconia tube as a pilot oxygen stream medium, using Ag was used as the anode, as a cathode for pure iron bars, constituting the battery: Ir | [O] Ag | ZrO 2 (MgO) FeO (slag) iron bar, the applied voltage controlled oxygen flow restored derived initial establishment of a dynamic model of the whole process of slag applied voltage electrochemical reduction. The results showed that, using controlled oxygen flow reduction technology is feasible to extract pure metal iron directly from iron oxide slag. Plus a suitable voltage can significantly promote the reduction of the slag FeO, plus the higher the voltage, the greater the starting outside the circuit current, the faster the restore. Ag liquid can be recycled in this method to use, and provides the possibility for the establishment of a new green metallurgical short flow process; zirconia tube and use as an isolation film, restore (for example, conventional melt reduction) compared with the traditional contact, and to avoid the reduction product pollution by reducing agent can get the pure metal. This method can not only extract the iron, and can also be extended to other precious metals and refractory metals on the preparation.

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