Study on leaching vanadium from roasted residue of stone coal

High-Purity V2O5 Nanosheets Synthesized from Gasification Waste: Flexible Energy Storage Devices and Environmental Assessment

“…Since other metal ions may also get rinsed out during the extraction processes, additional extraction processes are normally required by adjusting the pH value of leachate to separate vanadium exclusively. These multistage extraction processes generate large quantities of wastewater containing heavy metals. − The final-stage solution containing vanadium ions is finally mixed with ammonium solution (e.g., ammonium chloride (NH 4 Cl)) to precipitate ammonium vanadate (NH 4 VO 3 ), which can be thermally decomposed into V 2 O 5 at 550 °C. Compared to the traditional V 2 O 5 production, we proposed an alternative approach to extracting toxic vanadium from industrial waste for the synthesis of high-quality V 2 O 5 crystals.…”

A mechanism of calcium fluoride-enhanced vanadium leaching from stone coal

“…Recently, an eco-friendly and hopeful process known as direct acid-leaching solvent extraction was developed . Specifically, fluorine-bearing aid-leaching reagents (e.g., HF, NH 4 F, H 2 SiF 6 and CaF 2 ) are introduced into the leaching system to improve the efficiency of vanadium leaching (He et al, 2008). So far, a few researchers have researched the fluoride-assisted vanadium leaching.…”

Effective Extraction of Vanadium from Bauxite-Type Vanadium Ore Using Roasting and Leaching

“…In bauxite-type vanadium ores, most of the vanadium occurs in the crystal structure of aluminosilicate minerals. Therefore, destroying the crystal structure of these vanadiumbearing minerals is a prerequisite for leaching vanadium [23]. The methods of destroying the lattice structure of aluminosilicate minerals are usually high-temperature calcination or H + entry into the lattice to break the chemical bonds.…”