Smelting Vanadium–Titanium Magnetite by COREX Process
The slag foaming caused by Ti(C,N) is the main limitation of smelting vanadium–titanium magnetite by blast furnace. COREX, with unique pure oxygen injection that avoids the formation of Ti(C,N), has a huge potential advantage for the smelting of vanadium–titanium magnetite. In the present study, the detailed characterization was …
Thermodynamic Analysis of the Reduction of Vanadium-titanium …
IntroductionVanadium-titanium magnetite (VTM) is a composite polymetallic ore composed of titanium (Ti), iron (Fe), and vanadium (V). 1,2) VTM is widely distributed in China, the United States and India. 3,4) The key to using VTM is to ef f ectively separate and extract the valuable metals, such as iron, vanadium, and titanium.
Hydrogen retention by vanadium-titanium alloys | Inorganic …
Hydrogen retention in vanadium and its binary alloys with titanium are investigated by means of hydrogen thermal desorption spectrometry. The samples are saturated with hydrogen for 2000 h at a temperature of 620 K in an autoclave, where hydrogen is fed at a pressure of 16.8 MPa. It is shown that in V-Ti alloys there are two main types of traps for …
Activity origin and design principles for atomic vanadium
Conversion of inert N2 molecules into NH3 via electrochemical methods is an environmentally friendly alternative to replace the traditional Haber-Bosch process. However, the development of highly efficient catalyst is still challenging. Herein, we report a density functional theory (DFT) based high-throughput screening to investigate the potential of 23 atomic …
Hydrogen diffusion in titanium dihydrides from first principles
Many transition metals are known for their ability to absorb significant amounts of hydrogen. For example, titanium, as well as niobium, vanadium, and chromium can hold up to two hydrogens per every atom of metal, thus forming dihydride with fluorite structure. In the case of titanium, it is called δ-phase, and its unit cell is shown on Fig. 1 a.
First principles study of vacancy-solute complexes in vanadium
On the other hand, in vanadium alloys the O and N atoms as typical impurity play an important role in interacting with vacancies [3, 7, 11], and further form vacancy–solute complexes, strongly affecting the diffusion of vacancies.Thermal desorption spectra experiments revealed that most of vacancies in vanadium and its alloys are decorated by interstitial …
Separation of Vanadium and Titanium Phase from the …
To effectively recycle and utilize vanadium and titanium resource from the vanadium slag, the crystalliza-tion and separation behaviors of V-spinel phase and Ti-spinel phase in the FeO–SiO …
Vanadium–Titanium Magnetite Concentrate, …
This paper investigated a pellet ore production process in which vanadium was extracted from vanadium and titanium magnetite concentrates using sulfuric acid leaching. Calcium and magnesium were added to the iron ore concentrate during pellet production to produce calcium vanadate and magnesium vanadate after roasting. The pellets were leached …
Effect of the alloying element titanium on the stability and trapping ...
With a first-principles method based on density functional theory, the effect of the alloying element titanium (Ti) on the thermodynamic stability and electronic structure of hydrogen (H) in pure vanadium (V) is investigated. The interactions between H and the vacancy and the defect solution energies in a dilute V–Ti binary alloy are calculated. The results show …
The effects of interstitial impurities on the mechanical properties …
Vanadium (V) alloys are considered as a candidate for blanket structural materials for fusion reactor systems due to their low-induced activation characteristics, and remarkable elevated temperature mechanical properties in the fusion environment [1], [2], [3] terstitial impurities (O, N, and C) play key roles in the microstructure, influencing important …
Preparation, Sintering Behavior and Consolidation Mechanism of Vanadium ...
High-quality oxidized pellets are the basis to achieve high-efficiency utilization of vanadium–titanium magnetite (VTM) ores. Bentonite was used as a binder of VTM. The main phase composition of VTM is titanomagnetite and ilmenite. When the amount of bentonite is 1%, the compressive strength and dropping strength of VTM pellets can meet the requirements. To …
Insight into point defects and impurities in titanium from first ...
For example, the yield strength of high-purity titanium (99.99 %) increases from about 322 MPa for low iron commercially pure titanium to about 420 MPa with an increase in oxygen content from 2100 ...
Electrode materials for vanadium redox flow batteries: Intrinsic ...
Vanadium redox flow battery (VRFB) is considered to be one of the most promising renewable energy storage devices. ... Titanium-based compounds (such as TiO 2, TiC, TiN) have excellent catalytic performance for VRFB. Wang et al. [97] obtained carbon nanofibers (CNF/TiO 2) through electrospinning technology and applied them to negative electrode.
A review of solute-point defect interactions in vanadium and its …
Vanadium alloys are the promising first wall and blanket materials for fusion reactors. Large amounts of helium (He) and hydrogen (H) impurities are produced inside the materials along with irradiation defects under neutron irradiation, leading to bubble formation and microstructure changes, which will degrade the thermal and mechanical properties of …
Hydrogen-induced interactions in vanadium from first-principles ...
We present a first-principles study on hydrogen-induced interactions in vanadium, such as V-H, H-H, and vacancy-H interactions, which are relevant to the H-induced embrittlement in vanadium alloys employed as purification membranes. Insertion of H at tetrahedral interstitial sites of V proceeds exothermically and lowers the energy levels of V 3, 4, …
The structure evolution of titanium–vacancy complex in a vanadium …
The solute–vacancy interaction in body-centered cubic (bcc) metals is spatially limited within the second nearest-neighbor (2nn) lattice distance [6, 11] V-based systems, 2nn distance was also considered to study the diffusion behavior of solutes and vacancies [9, 13, 14, 19] the model for searching the titanium–vacancy complex evolution, we construct the 1nn …
Research progress of vanadium extraction processes from vanadium …
Fig. 2 shows the distribution of vanadium ore in the world. The world''s vanadium ore reserves are about 2.4165 × 10 7 t, which represents the portion that meets requirements of current extraction and production. The reserves of vanadium in China, Russia, South Africa and Australia account for 99 % of the world''s reserves, and China''s vanadium ore reserves are the …
Enrichment and reconfiguration of titanium-bearing phase in …
The reserves of vanadium–titanium magnetite exceed 18 billion tons [], accounting for over 90 wt.% of China''s titanium resource reserves [2, 3].At present, the blast furnace method of smelting vanadium–titanium magnetite only recovers Fe and a part of V [].Due to the low titanium content [5, 6] and the difficulty in dissociating the Ti-bearing phase [], …
Activity origin and design principles for atomic vanadium …
The d-orbital electron of TMs can effectively interact with the σ and π orbitals of N 2 and accelerate the protonation of N 2 to NH 3 . For example, TMs doped in graphene [15], phosphorene [16 ...
Mass Action Concentration Calculation and Experimental Study …
In order to realize the comprehensive and efficient recovery of vanadium–titanium magnetite, a mass action concentration calculation model for direct melting reduction was established, and the mechanisms and limiting factors for the separation and enrichment between Fe, V, and Ti were also studied through molten vortex direct reduction experiments. The mass …
Recovery of Vanadium, Titanium, and Iron from Vanadium
In this study, an efficient utilization of vanadium titanomagnetite concentrate was systemically investigated through potassium pyrosulfate (K2S2O7) synergized with ammonium sulfate ((NH4)2SO4) cascade roasting to separate and recover vanadium, iron, and titanium. The result shows that 95.87% of vanadium and 80.13% of iron could be extracted, while that of titanium …
First-principles investigation of interaction between surface …
DOI: 10.1016/j.apsusc.2022.154535 Corpus ID: 251685498; First-principles investigation of interaction between surface oxygen and other alloy atoms in α-Ti (0001) for designing high-temperature titanium alloy
High-Efficiency Smelting Separation of Vanadium–Titanium
South African vanadium–titanium magnetite is a complex mineral resource rich in iron, vanadium, titanium, and chromium [1,2,3] s ore composition is composed of more than 20 elements [4,5,6] is the most complex ore of its type in the world and contains more than 10 valuable elements, so it has a very important integrated utilization value.
Extraction of Vanadium from Vanadium–Titanium Magnetite: …
The sodium roasting–water leaching process for vanadium–titanium magnetite (VTM) concentrate faces challenges such as low vanadium recovery, excessive addition of sodium salt, and high alkali content in the tailings. Therefore, reducing the presence of toxic elements like vanadium and alkali metal sodium in the extraction tailings is crucial for the …
A method for recovery of iron, titanium, and vanadium from vanadium ...
An innovative method for recovering valuable elements from vanadium-bearing titanomagnetite is proposed. This method involves two procedures: low-temperature roasting of vanadium-bearing titanomagnetite and water leaching of roasting slag. During the roasting process, the reduction of iron oxides to metallic iron, the sodium oxidation of vanadium oxides …
Hydrogen Retention by Vanadium–Titanium Alloys
maximum titanium content V–10 wt % Ti) by alloying vanadium with titanium in a MIFI9 vacuum arc fur nace. Model alloys with 0.5, 1, 5, and 10% Ti additions were prepared by alloying the master alloy with vana dium. The content of titanium was determined using a Camebax SX50 microanalyzer. Pure vanadium served as a reference.
Effect of the alloying element titanium on the stability and trapping ...
With a first-principles method based on density functional theory, the effect of the alloying element titanium (Ti) on the thermodynamic stability and electronic structure of hydrogen (H) in pure vanadium (V) is investigated. The interactions between H and the vacancy and the defect solution energies in a dilute V-Ti binary alloy are calculated. The results show that: (i) a single H atom ...
First-principles study of hydrogen trapping and ...
First-principles study of hydrogen trapping and diffusion mechanisms in vanadium carbide with connecting carbon vacancies. Author links open overlay panel Linxian Li a, Huifang Lan a ... Hydrogen insertion in substoichiometric titanium carbide. Int J Hydrogen Energy, 40 (2015), pp. 8562-8570, 10.1016/j.ijhydene.2015.05.009. View PDF View ...
A review of mechanism and technology of vanadium extraction …
Black shale represents a unique and strategic vanadium resource in China, accounting for ~ 90% of the nation''s vanadium reserves. The complex forms of occurrence of vanadium in black shale, particularly its incorporation into aluminosilicate mica via isomorphism, render it tightly bound and challenging to extract. Against the backdrop of green metallurgy and …
Effect of the alloying element titanium on the stability and trapping ...
A theory by Zhang et al. [10] and first-principles exploration by Gui et al. [14] of the trapping mechanism of H vacancies in solid V both showed that single H atoms preferentially occupy sites ...