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Li C.-W.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Si X.-G.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Si X.-G.,Hebei Iron and Steel Group Tangshan Iron and Steel Co. | Lu X.-G.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2011

The samples were dissolved with ferric chloride solution, and the metallic iron was oxidized to ferrous chloride. After filtration and separation, the acidified filtrate was titrated by potassium dichromate standard solution using sodium diphenylamine sulfonate as indicator, realizing the determination of metallic iron in reduction products of titanium fine powder. The results showed that the optimal experimental conditions were as follows: the sample granularity was less than 0.125 mm; the concentration and dosage of ferric chloride solution were 10 g/L and 100 mL, respectively; the electromagnetic stirring time was 60 min. The accuracy of method was tested using HgCl 2 analysis and mineral phase detection. The F test and t test results indicated that this method had no significant difference from HgCl 2 method. Meanwhile, the comparison of X-ray diffraction and metallograph for sample before and after leaching further proved that there was no metallic iron phase in filter residue and the iron was fully leached. This method was applied to the determination of reduction product samples of titanium fine powder, and the relative standard deviation (RSD) of results was smaller than 2%.


Zhao B.-J.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Zhao B.-J.,Hebei Iron and Steel Group Tangshan Iron and Steel Co. | Lu X.-G.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Zou X.-L.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | And 2 more authors.
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2011

To solve the problem of high environmental impact and high energy consumption in Si industry, electrochemical reduction of solid SiO 2 to prepare Si by SOM process was carried out in molten salt. The influences of electrolysis parameters such as reduction time, cell voltage, molten salt temperature on the product were investigated and the micro-structural characteristics and phase composition of the products was examined by SEM and XRD. The results showed that the SiO 2 was completely reduced to Si after electrolyzed for 2 h at 3.5 V in 1100°C molten CaCl 2, and the current efficiency was 89%, the electrolysis energy consumption was as low as 15 kW·h/kg. There was CaSiO 3 formed during electrolysis, and it was deoxidized to Ca and Si finally. The SOM process reduced 50% reaction time compared with FFC process, so that it might have a bright future for industrial application.


Si X.-G.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Si X.-G.,Hebei Iron and Steel Group Tangshan Iron and Steel Co. | Lu X.-G.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Li C.-W.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | And 2 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2011

Ferrous powder oxidation processing was studied by thermogravimetry with different heating rates and gas fluxes. Experimental data treated according integral method and the kinetics parameter E was obtained with different gas flux. The results show that heating rate and gas flux can change microstructure of oxidized products. The major step of oxidation of ferrous powder changes from out diffusion to inner diffusion, and finally to out diffusion. Energy of oxidation is between 48 kJ/mol and 52 kJ/mol from 220°C to 350°C, between 22 kJ/mol and 30 kJ/mol from 400°C to 600°C, and between 11 kJ/mol and 15 kJ/mol from 620°C to 750°C, respectively. Optimal gas flux is 45 mL/min under the condition of heating rate of 8°C/min.

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