The complex reactions involved in the oxidation of …
The complex reactions involved in the oxidation of formaldehyde to formic acid over a Vanadium titanium oxide catalyst are shown below. Each reaction follows an elementary rate law. ... The initial volumetric flow rate …
Oxidation kinetics of a low-grade vanadiferous …
Abstract. In order to better develop and utilize the low-grade vanadiferous titanomagnetite concentrate with high titanium (LVCHT) and provide reference for the …
Implication of hydrolysis on vanadium precipitation with …
Vanadium & Titanium Co., Ltd., Panzhihua, China, with an initial pH value of 9.0. Its main chemical composition is exhibited in Table 1. The other chemical reagents utilized in this study were all ana- ... vanadium concentration of qualified solution, g·L 1; C 1 is the vana-dium concentration in the upper liquid, g·L 1; V 0 is the volume of
Metal concentrations in the serum and hair of patients with titanium …
Methods: Titanium, aluminum, and vanadium concentrations in serum and hair were measured after surgery in 46 patients with titanium alloy spinal implants (12 patients in the implant failure group and 34 patients in the no implant failure group) and 20 patients without spinal implants (control group). All the subjects were examined again 1 …
Hydrothermal Separation of Titanium Vanadium and …
Vanadium, titanium and chromium are significant strategic metals which are widely used in aerospace, energy and alloy fields, etc. . Vanadium slag (VS) ... The concentration of vanadium was improved from 2.42 to 7.15 g/L, and chromium from 1.14 to 2.68 g/L. 3. The vanadium and chromium in the stripping solution can be …
High-Efficiency Extraction of Fe, V, and Ti from …
About 75% Fe, 82% V, and 44% Ti pass into iron concentrate during ore enrichment [ 1 ]. Therefore, the question of how to improve comprehensive utilization of …
Efficient Extraction of Vanadium from …
The vanadium–titanium magnetite ore used in the experiment was from Chao-yang, China. After crushing and grinding, the particle size of the ore was 0.074 mm, accounting for 65% of the ... chemical phase analyses of vanadium in the concentration which was measured by sequential extraction procedures [24] are illustrated in Table2, and the XRD …
Characterization and Pre-Concentration of Low …
Jing Huang. Published 4 August 2017. Geology, Materials Science. Minerals. A large number of unexploited low-grade vanadium-titanium magnetite deposits have been …
Metals | Free Full-Text | Vanadium–Titanium …
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 …
Sustainable Selective Recovery of Sulfuric Acid and …
of 5−6 m3 with a concentration of 20% and the acid wastewater of 50−80 m3 with a concentration of 2%−6% would be discharged per ton of titanium dioxide.4 TDWA also contains metal ions such as iron, vanadium, titanium and aluminum besides sulfuric acid. Vanadium (V) is a rare metal that can also cause serious heavy metal …
Characterization and Pre-Concentration of Low-Grade …
Pre-concentration technology depends on the difference of the separation characteristics between target minerals and gangue minerals. In vanadium-titanium magnetite ore, vanadium mainly occurs in the form of isomorphism in titanium magnetite, whereas titanium mainly occurs in ilmenite, and the main gangue minerals are feldspar and …
Vanadium mobilization and redistribution during mineral …
Herein, a series of concentrations of V(V) (0–200 mg L −1) solutions were added to the vanadium‑titanium magnetite tailings at different depths separately to simulate the redistribution of dissolved V released from tailings in the solid phase of tailings. During the 56-day incubation, the concentrations of aqueous V in the surface ...
Efficient Extraction of Vanadium from Vanadium–Titanium …
The vanadium–titanium magnetite ore used in the experiment was from Chao-yang, China. ... concentration, the vanadium leaching efficiency continues to increase sharply. However, when the
Efficient separation of vanadium, titanium, and iron from vanadium …
The concentration of vanadium and iron was enriched to 17.8 g/L and 10.6 g/L through the N 235 solvent extraction-Na 2 SO 4 washing-Na 2 CO 3 stripping processes, ... The extraction rates of vanadium, titanium, and iron under different temperatures (a), different environments (b), XRD patterns of the roasted samples at …
Vanadium. Its Role for Humans
The body pool of an average human being (70 kg body mass) amounts to ca. 1 mg V, the average blood plasma concentration to 45 nM. Oral intake of vanadium is somewhat increased for sportsmen and bodybuilders resorting to preparations containing VOSO 4. This 'vanadyl fuel' allegedly helps increasing the muscle mass.
Preparation and Modification of Heterogeneous …
Coordination chemistry of vanadium oxide is referred to vanadium concentration and pH of a solution (Fig. 1) [ 23 – 25 ]. In other cases, the working …
Superconducting transition temperatures of pure vanadium and vanadium
Ordinary superconductors are widely assumed insensitive to small concentrations of random nonmagnetic impurities, whereas strong disorder suppresses superconductivity, ultimately leading to a superconductor-insulator transition. ... This effect is discussed here for the $ensuremath{beta}$ phase of vanadium-titanium alloys. …
Pressure leaching of converter vanadium slag with waste titanium
Vanadium is widely distributed in the nature, accounting for about 0.02 wt% of the crust, and there is a symbiotic relationship among vanadium, iron, titanium, and uranium in the mineral [].China is rich in the resources of titanomagnetite, mostly deposited around the Panzhihua, Sichuan, Chengde, and Hebei areas [2, 3].As the titanomagnetite …
Effect of oxygen enrichment on sintering behavior of high
To achieve high-efficiency utilization of complex and unmanageable iron-containing minerals, the effects of oxygen enrichment on productivity, yield, flame front speed, exhaust gas peak temperature, and desulphurization reaction of the vanadium–titanium magnetite sintering process as well as sinter tumble index and …
Effects of titanium concentration on microstructure and …
Fig. 3 shows bright-field TEM images of high-purity vanadium alloys with various Ti concentration. It is evidently noted that there are no precipitates in V-4Cr alloy, in contrast, precipitation occurs with higher Ti concentrations in V-4Cr-(1∼4)Ti alloys, suggesting that there is a threshold of Ti concentration for occurrence of precipitation in …
Effect of Smelting Time on Vanadium and Titanium …
Vanadium–titanium magnetite is an important Fe, V, and Ti resource with a highly comprehensive utilization value [1,2,3].Chinese vanadium–titanium magnetite reserves are plentiful but underutilized, with over 18 billion tons of proven vanadium and titanium magnetite reserves in China as of 2019 [].However, because of the complex …
A first principles analysis of oxidation in titanium alloys with
The opposite is true for higher vanadium concentrations (magenta circles in Fig. 4). Inwards relaxation is inversely proportional to the interlayer distance. Download : ... This configuration is similar to what we found in the vanadium doped titanium shown in Fig. 3 (e). Notably, reversing the order through which aluminum and vanadium atoms …
Optimized magnetic separation for efficient recovery …
The grade and recovery attained for the vanadium concentrates were 1.12% and 63%, respectively. In addition to vanadium, titanium concentrates were also obtained by medium-intensity magnetic separation and the grade and recovery were 38% and …
Characterization and Pre-Concentration of Low …
A vanadium-titanium magnetite concentrate with 1.14% V2O5, 22.22% TiO2, 42.51% Fe and a rough concentrate of ilmenite with 16.05% TiO2, 20.77% Fe were obtained from …
Characterization and Pre-Concentration of Low-Grade Vanadium-Titanium …
A magnetic separation process was investigated for the pre-concentration of low-grade vanadium-titanium magnetite ore. The results showed that 73.52% of feed ore were directly discarded for reducing the processing capacity of follow-up processing. A vanadium-titanium magnetite concentrate with 1.14% V2O5, 22.22% TiO2, 42.51% Fe …
Separation and Recovery of Vanadium(IV), Iron, and Titanium …
As shown in Table 2, the concentrations of vanadium, titanium, and iron in the vanadium-rich solution were 0.56 g/L, 0.03 g/L, and 0.06 g/L, respectively, and the vanadium stripping efficiencies reached 99.14%, suggesting that the impurity ions (such as Fe and Ti) in the solution were extremely low. The composite extractant could be …
Characterization and Pre-Concentration of Low …
A vanadium-titanium magnetite concentrate with 1.14% V2O5, 22.22% TiO2, 42.51% Fe and a rough concentrate of ilmenite with …
Co-extraction of Vanadium Titanium and Chromium from Vanadium …
To co-extract vanadium, titanium, and chromium from vanadium slag, a cleaner process featuring oxalic acid hydrothermal leaching with synergy of Fe powder was proposed in this paper. With the leaching temperature of 125 °C, oxalic acid concentration of 25 wt pct, liquid-to-solid mass ratio of 8:1, leaching time of 90 minutes, and iron …
Enrichment and reconfiguration of titanium-bearing phase …
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 …
A Method to Extract Vanadium from HIsmelt Reduction …
The vanadium titanomagnetite (VTM) ore is a special type of iron ore that contains not only iron oxides but also significant amount of vanadium (0.5–3 wt.% as in V 2 O 5) is the main resource for vanadium production [].Around 15% of global vanadium is extracted from the VTM ore directly and 75% from vanadium slag, which is a steel slag …
