Vanadium Pentoxide Manufacturing Technique and Methods


In China, vanadium pentoxide is commonly used in metallurgy, chemical industry, and so on, with the focus on ferrovanadium smelting. It is no exaggeration to say that the manufacturing technique of vanadium pentoxide decides the future development of China’s ferrovanadium industry. This article will introduce in detail.

At present, the raw material for the industrial extraction of vanadium pentoxide is mainly vanadium-containing stone-like coal and vanadium-bearing titanomagnetite. The grade of vanadium-containing vanadium pentoxide stone-like coal is generally between 0.5% and 1.5%, and the grade of vanadium pentoxide vanadium-bearing titanomagnetite is from 1.0% to 5.0% in general.

Generally speaking, the manufacturing technique of vanadium pentoxide includes: firstly, decompose the vanadium mineral. There are principally two kinds. One is sintering process. Mix the smashing mineral powder with soda or sodium salt, and sintering under high temperature to oxidize the low valence state vanadium. After transforming into pentavalent sodium vanadate, leaching with water and dissolve the vanadium into the solution; the second one is acid-leaching method, which uses dilute acid (mainly dilute sulphuric acid) to heat and leach the pulverizing mineral powder. It directly decomposes the vanadium into the solution.

After the decomposition of vanadium mineral, leach the sintering material with water. Conduct filtration and washing until the vanadium is dissolved into the solution by the form of sodium metavanadate. The filtrate is crude sodium metavanadate solution. Then, purify and separate the impurity by chemical precipitation, solvent extraction, and other techniques until the vanadium is accumulated into a certain degree of concentration, usually above 15g/l. Adjust the PH value of pure metavanadate solution to 6.5-7.5, and add four times of the theoretical weight of ammonium bicarbonate or ammonium chloride solution as precipitator. Keep the temperature below 30°C, then, separate out the ammonium metavanadate sediment and filter. Wash 2 to 3 times with 5% ammonium bicarbonate solution, and 1 to 2 times with 30% ethyl alcohol. The pure ammonium metavanadate product can be obtained after drying.

The PH value of lixivium in the industrial production is approximately 8 to 9. Add ammonium chloride precipitator and concentrated sulfuric acid to regulate the PH value to 2-2.5, the vanadium can be precipitated by the form of ammonium metavanadate. Finally, heat the dried ammonium metavanadate slowly to 300°C in the rotary kiln. Maintain for one hour, and heat up to 500-550°C (No more than 650°C, or vanadium pentoxide will melt). Maintain for 2 hours, finally reduce to 450°C, and maintain for 1 hour. Cool down. The stable vanadium pentoxide products with correct compositions can be obtained.

Specialists of metal powder manufacturer remind you that necessary protective measures should be taken during the production of vanadium pentoxide. Safely restore the vanadium pentoxide products which can be used as the addictives of ultra-hard tools.