In the present study, we monitored the dynamic change of microbiota in the rhizosphere of Pongamia pinnata during a 2-year on-site remediation of vanadium-titanium magnetite tailings. After remediation, overall soil health conditions were significantly improved as increased available N and P contents and enzyme activities were discovered.
V2 − y Ti y O5 − δ · nH2O (0 < y < 1.33, layered structure) and Ti1 − y V y O2 + δ · nH2O (0 < y < 0.25, anatase structure) solid solutions are synthesized by a sol-gel process. ESR spectra are used to assess the state of tetravalent vanadium in the solid solutions before and after calcination at 350°C and after intercalation with K+. Six types of ESR signals …
A titanium alloy containing 4% vanadium and 6% aluminium (Ti6Al4V) has been used very extensively for blades, discs and casings of the compressors in many designs of the aero-engine gas turbine. The heat treatment made possible by the vanadium and aluminium enables high strength alloys to be produced that maintain a high strength up to ...
The recycling of mineral tailings is an important research topic. In this work, composite material was prepared using vanadium titanomagnetite (VTM) tailings, kaolin and sodium silicate, and used as a photocatalyst for photocatalytic degradation organic dyes. The results showed that the photocatalytic material has good photocatalytic …
vanadium–titanium magnetite. CVTS has not been exten-sively mined, produced, nor used because of its complex composites despite its broad and valuable applications in various industries. Our previous study provided a basis for the study of optimal composite ratio for CVTS before feed-ing it to a blast furnace [17–18]. Instead of focusing on
The advantages of the atomic layer deposition (ALD) method for preparation of tungsten, vanadium, titanium, and molybdenum oxide catalyst supported on mesoporous silica are discussed, with emphasis on the importance of synthesis conditions on dispersion, structure and activity of the resulting materials. A suite of complementary techniques such as …
PDF | On Nov 18, 2021, Liwei Liu and others published Recovery of Fe and V via selective reduction–magnetic separation of vanadium-titanium magnetite concentrate | Find, read and cite all the ...
A comprehensive review of the heavy metal issues regarding commercial vanadium‑titanium-based SCR catalyst. Wu YW 1, Zhou XY 1, Zhou JL 1, Hu Z 1, Cai Q 1, Lu Q 1 ... Focusing on the mercury oxidation as well as against arsenic/lead poisoning, certain modification strategies are also concluded to develop novel SCR …
They reported that a vanadium‑titanium magnetite concentrate containing 1.14% V 2 O 5, 22.22% TiO 2, 42.51% Fe, and a concentrate of ilmenite containing 16.05% TiO 2 and 20.77% Fe were obtained according to the different magnetic intensities in the range of 0.4–0.8 T. However, because there is no explanation for the vanadium …
Spent V 2 O 5-WO 3 /TiO 2 catalyst was used to prepare titanium-bearing pellet.. Leaching behaviors and solidification mechanism of vanadium in pellets were studied. • The leaching rate of V 2 O 5 in spent catalyst pellets was less than 1%.. 91.2 wt% of vanadium oxide was solidified as FeVO 4, Fe 2 VO 4 and FeV 2 O 4.
A comprehensive review of the heavy metal issues regarding commercial vanadium‑titanium-based SCR catalyst Sci Total Environ. 2023 Jan 20;857(Pt …
The effect of calcium oxide on the crushing strength, reduction, and smelting performance of high-chromium vanadium–titanium magnetite pellets (HCVTMP) was studied in this work. The main characterization methods of an electronic universal testing machine (EUTM), X-ray fluorescent (XRF), inductively-coupled plasma-atomic emission …
Vanadium-titanium magnetite is a complex symbiotic iron ore resource composed of iron, vanadium, titanium and other metals, which is one of the most important iron ore resources in China [1,2,3,4].Titanium, as an indispensable metal raw material for the modern industry and advanced science and technology, is mostly …
In this study, an efficient utilization of vanadium titanomagnetite concentrate was systemically investigated through potassium pyrosulfate (K2S2O7) synergized with …
Focusing on the mercury oxidation as well as against arsenic/lead poisoning, certain modification strategies are also concluded to develop novel SCR catalysts with multiple functions. ... In addition, since the best working temperature of the vanadium‑titanium-based catalyst is 300– 450 °C, the SCR system is often installed in …
The reduction slag of vanadium and titanium slag contains 30% CaO. If calcium roasting-acid leaching was chosen it will consume a large amount of sulfuric acid and produce refractory tailings containing calcium sulfate. ... In this study, some of the details of the new process will be elaborated and discussed, focusing the leaching …
The vanadium-titanium magnetite (VTM) has a high comprehensive utilization value because it is an important source of iron (Fe) and other elements such as titanium (Ti) and vanadium (V). ... To our best knowledge, the VTM is mainly used in the field of iron and steel smelting, there was no research focusing on the VTM for PMS …
Various comprehensive utilization of vanadium extraction tailings have been reviewed and compared, mainly focusing on the extraction of vanadium, iron, titanium, and gallium from vanadium extraction tailings and the preparation of titanium-iron black ceramic building materials, far-infrared coatings, converter slagging agents, and so on ...
2.1 Materials. The feed solution from leaching vanadium-bearing titanomagnetite was employed by my laboratory, which revealed that the iron powder could reduce vanadium(V) to V(IV) and Fe 3+ to Fe 2+ (ORP - 15.4 mV) [].The concentration of the feed solution is listed in Table 1.Table 1 presents that the concentrations of …
3.2.1. Effect of Leaching Temperature and Time The effect of temperature on the leaching of vanadium from the roasted products was studied in a range of 20 to 80 …
1. Introduction. Vanadium is an important strategic metal and is widely used in the iron and steel industry, as well as in non-ferrous alloys due to its excellent hardness, tensile strength, and corrosion resistance [1].Vanadium accounts for only 0.02% of the crustal weight, which although is a higher abundance than that of copper, zinc, and …
The main purpose of the review is to focus on the synthesis, morphology, properties and characterization methods of MnZn ferrites. While the subject of magnetic nanostructures is enormously wide and a large number of good review articles are published on magnetic nanoparticles, MnZn ferrites in particular constitute a special …
Focusing on the mercury oxidation as well as against arsenic/lead poisoning, certain modification strategies are also concluded to develop novel SCR …
1. Introduction. Vanadium-titanium magnetite is a complex symbiotic iron ore resource composed of iron, vanadium, titanium and other metals, which is one of …
They reported that a vanadium‑titanium magnetite concentrate containing 1.14% V 2 O 5, 22.22% TiO 2, 42.51% Fe, and a concentrate of ilmenite containing 16.05% TiO 2 and 20.77% Fe were obtained according to the different magnetic intensities in the …
Vanadium-titanium magnetite is an important source of vanadium, and V 2 O 5 is the main vanadium product. At present, the production of V 2 O 5 is mainly obtained by sodium salt roasting and ammonium salt precipitation, while ammonia nitrogen wastewater and NH 3 discharge will cause serious environmental pollution. Calcium and …
Vanadium is a chemical element; it has symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer ( passivation) somewhat stabilizes the free metal against further oxidation .
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. ... focusing on the influence of the chemical.
A total Inferred mineral resource of 103 million tonnes with a mean grade of 0.11% vanadium pentoxide, 9.46% titanium dioxide and 5.36% magnetite
2.1 Materials. The feed solution from leaching vanadium-bearing titanomagnetite was employed by my laboratory, which revealed that the iron powder …
This preference can be attributed to the increased number of vanadium ions, as vanadium ions are smaller in size compared to titanium ions. Additionally, for the same sputtering current, the (111) peak exhibits higher intensity than the (220) and (200) peaks and is slightly shifted to the right of the standard TiN (111) peak.
1. Introduction. The vanadium–bearing titanomagnetite (VBT) is a strategic and complex iron ore, which containing valuable metals of vanadium, titanium, and iron used as constituents of several alloys, whitepigments, and steel [1], [2], [3].In China, the gross reserve of titanium in VBT ore is estimated to be about 1.18 million tons, …
