The results indicate that the optimal process parameters for direct reduction of vanadium–titanium magnetite in a rotary kiln are as follows: a reduction temperature of 1150 °C, reduction time ...

Coal-based reduction and magnetic separation behavior of low-grade vanadium-titanium magnetite pellets were studied in this paper. It is found that the metallization degree increased obviously with an increase in the temperature from 1100 °C to 1400 °C. The phase composition transformation was specifically analyzed with X-ray …

The role of cluster size and composition is investigated by studying the reaction kinetics of larger (V 6 O 15 − and V 8 O 20 −) and titanium doped (V 3 TiO 10 − and V 2 Ti 2 O 10 −) vanadium oxide clusters with SO 2. The observed cluster size and composition dependencies are discussed.

Read this article. The induration process and oxidation kinetics of Hongge vanadium titanium-bearing magnetite (HVTM) pellets have been investigated by employing X-ray diffraction, scanning electron microscope, energy-dispersive …

International Journal of Minerals, Metallurgy and Materials - The reduction of vanadium titano-magnetite pellets by H2–CO at temperatures from 850 to 1050°C was investigated in this...

The single variable method was employed to investigate the general behavior and describe the kinetics of titanium leaching from mechanically activated titanium-bearing blast furnace slag. The optimal leaching characteristics were determined by varying the leaching temperature, leaching time, stirring intensity, hydrochloric acid …

High-chromium vanadium–titanium magnetite (HCVTM) is a good valuable resource with high iron content in the form of complex iron ore which contains various valuable metal elements such as iron, vanadium, titanium, chromium. Direct reduction of HCVTM is studied based on thermodynamic analysis. Combined TG experimental …

Abstract. In order to better develop and utilize the low-grade vanadiferous titanomagnetite concentrate with high titanium (LVCHT) and provide reference for the …

1. Introduction. Vanadium (V) and titanium (Ti) are important strategic metals, which are widely used in metallurgical industry, chemical industry, machinery manufacturing, battery, aerospace, etc. [[1], [2], [3], [4]].As a representative resource for extracting V and Ti, vanadium–titanium magnetite (VTM) is a polymetallic symbiotic …

In this work, the reduction behavior of vanadium–titanium sinters was studied under five different sets of conditions of pulverized coal injection with oxygen …

The application of microwave-assisted grinding for vanadium-titanium magnetite proves advantageous in improving the particle size composition of the grinding product. …

In this work, the reduction behavior of vanadium–titanium sinters was studied under five different sets of conditions of pulverized coal injection with oxygen enrichment. The modified random pore model was established to analyze the reduction kinetics. The results show that the reduction rate of sinters was accelerated by an …

In addition, temperature was an important factor influencing on reaction rate. Key words : carbon composite pellet; reduction kinetic; catalyst; vanadium titano-magnetite Vanadium titano-magnetite is a kind of complex iron ore which contains various valuable metal ele­ ments such as iron, vanadium, titanium, etc.

Reduction of chromium-bearing vanadium–titanium sinter (CVTS) was studied under simulated conditions of a blast furnace, and thermodynamics and kinetics were theoretically analyzed. Reduction kinetics of CVTS at different temperatures was evaluated using a shrinking unreacted core model. The microstructure, mineral phase, …

Non-isothermal reduction kinetics and mechanism of high chromium vanadium-titanium magnetite pellets were studied at 400-1100 degrees C, simulating the lumpy zone of blast furnace conditions.

35 Citations. Explore all metrics. Abstract. The grinding behavior of the as-received (5 pct moisture) vanadium-titanium magnetite concentrates in a damp mill was …

The reduction of high-chromium vanadium–titanium magnetite as a typical titanomagnetite containing 0.95wt% V2O5 and 0.61wt% Cr2O3 by H2–CO–CO2 gas mixtures was investigated from 1223 to 1373 K. Both the reduction degree and reduction rate increase with increasing temperature and increasing hydrogen content. At a …

The induration process and oxidation kinetics of Hongge vanadium titanium-bearing magnetite (HVTM) pellets have been investigated by employing X-ray diffraction, scanning electron microscope ...

The solid-state reduction kinetics of pre-oxidized vanadium-titanium magnetite concentrate was studied. The phase and microstructure of the reduction product were characterized by XRD, SEM and EDS ...

However, the polysulfide shuttle effect and slow redox kinetics are recognized the most stumbling blocks on the way of commercializing LSB. On this account, for the first time, we use Ti x+ in-situ intercalation strategy via titanium foil/vanadium ion (V 5+) solution interface

High chromium vanadium-titanium magnetite (HCVTM) is a typically complex polymetallic iron ore resource with abundant reserves in China. It is mainly deposited around the Panzhihua-Xichang (Panxi ...

Grinding Kinetics of Vanadium-Titanium Magnetite Concentrate in a Damp Mill and Its Properties. H. Long, T. Chun, +3 authors. Jiaxin Li. Published in Metallurgical and …

To achieve the high-efficiency utilization of vanadium-titanium magnetite (VTM), reduction experiments were conducted to determine the carbothermic reduction mechanism of VTM. Effects of volatile matter, temperature, time, and carbon ratio (molar ratio of fixed carbon in coal to oxygen in iron oxides of VTM) on reduction degree were …

The thermoravimetry-differential scanning calorimetry-quadrupole mass spectrometer method was used for kinetic analysis of the main reduction process. Results indicate that the kinetic mechanism follows the principle of random nucleation and growth ( n=4 ), and the activation energy values at 600–900 and 900–1350 °C are 88.7 and 295.5 …

Key words: vanadiumítitanium magnetite; solid-state reduction; reduction kinetics; reduction process 1 Introduction Panxi Area of China is endowed with large reserves of vanadiumítitanium magnetite, and the reserves of vanadium and titanium account for 11.6% and 35.17% of the total reserves in the world, respectively [1í4].

In this paper, potassium salt roasting additives were applied to extract vanadium from vanadium–titanium magnetite concentrate. Meanwhile, the mechanisms of potassium salt roasting and acid leaching kinetics …

@article{Pan2016OxidationKS, title={Oxidation Kinetics, Structural Changes and Element Migration during Oxidation Process of Vanadium-titanium Magnetite Ore}, author={Feng Pan and Qingshan Zhu and Zhan Du and Haoyan Sun}, journal={Journal of Iron and Steel Research International}, year={2016}, volume={23}, pages={1160-1167}, …

the vanadium extraction from the vanadium–titanium magnetite concentrate. At the same time, phase transformation analyses were conducted to reveal the mechanism by which potassium salt strengthens the vanadium extraction and the kinetics model was established to further explain the effect of potassium salt. 2. Experimental 2.1. Materials

Non-isothermal reduction kinetics and mechanism of high chromium vanadium–titanium magnetite pellets were studied at 400–1100°C, simulating the lumpy zone of blast furnace conditions. The phase transformation behaviour of valuable elements including Fe, Cr, V and Ti and microstructural changes of reduced pellets were examined …

In this work, we use an inorganic titanium precursor (titanium oxysulfate, TiOSO4) for the preparation of doped TiO2 by the sol–gel method. Molybdenum (Mo), iron (Fe) and vanadium (V) in the concentration range of 0.0312–2.0 mol% are added as dopants. The prepared samples were characterized by XRD, FTIR, N2 isotherms, …