Vanadium powder. Brand chemical composition.
Brief characteristics
Vanadium — an element of the V-th side group of the periodic table, where is denoted as V. the vanadium Powder gray color, in a compact form is a steel shade plastic metal. It is chemically active, easily drawn out in a thin thread at ordinary temperatures rolled in foil. The mixture of nitrides or carbides increases its hardness and fragility.
Physical properties of vanadium
| Atomic (molar) mass, g/mol | The degree of oxidation | Density [g/cm3] | The melting temperature t°C | The boiling point of t°C | Heat of evaporation kJ/mol |
|---|---|---|---|---|---|
| 50,94 | 0, 2, 3, 4, 5 | 6.11 | 1887°C | 3377°C | 460 |
Chemical properties
At ordinary temperatures the metal vanadium retains luster even in damp condensate. Powder vanadium when heated, it easily reacts with chlorine, sulphur, 2, and is capable of dissolving N2 to 42%. In the air due to heating, the powder changes color, covered with oxides in different oxidation States, and burning, is converted to V2 O5. During heating in the atmosphere N2 powder forms nitrides VN2, VN, V3 N, and the excess of chlorine forms a tetrachloride VCl4, Compact vanadium resistant to chemical reagents. It is dissolved by strong acids: HF, HN03, or Aqua Regia. The metal is stable in alkaline solutions, but is dissolved by the molten alkali. Carbon-containing gases when heated to form the carbide VC.
Production
First the vanadium is heated in vacuum to 200°- 250 °C, and then in medium2, which is generated by thermal cleavage of the titanium hydride with the transfer in the unsaturated state. (Unsaturated titanium hydride later used for absorption of hydrogen secreted by the hydride of vanadium in the dehydrogenation of powder). Compact vanadium activate at t° 600° — 780 °C, the hydrogenation proceeds at t° 50° C to 200 °C, When the vanadium hydride is ground to a powder, starts dehydrogenation at 650°- 780 °C with a gradual reduction of pressure up to 0.05 mm. mercury and the absorption of emitted N2, unsaturated titanium hydride. The method allows to obtain a particularly pure powder of vanadium. The installation consists of heat-resistant steel retorts, backing pump, highways for transportation and evacuation N2 with shut off valve, furnaces for heating the retorts. as well as measuring sensors.
Buy at best price
In stock, LLC «Electrocentury-steel» a wide range of high quality metal powders at the best prices. Vanadium powder comes in banks with gross weight up to 70 kg Warranty shelf life 24 months from date of manufacture. All products conform to standards and specifications. Implementation of orders in the shortest possible time. Wholesale buyers are offered preferential discounts.
