Vanadium Pentoxide V2O5 manufacturers--Benren Alloy Co.Ltd

<<  Home <<  News

News

Producing Vanadium Pentoxide From Slag Ore’s

Uranium potassium vanadate in the mineral carnotite is digested in sulphuric acid solution. Solvent extraction is used to stripe the uranium from the acidic leach liquor. The remaining solution is treated with iron powder to partially reduce the vanadium before solvent extraction is used to strip the vanadium. The resulting acidic vanadyl sulphate solution is heated and oxidised with sodium chlorate. A red sodium and ammonium polyvanadate filter cake is precipitated using ammonia before it is roasted to make vanadium pentoxide catalysts .
While the vanadium units are associated with the uranium and could be considered “zero mining cost” for accounting purposes up to the uranium extraction stage, the vanadium extraction process has a significant and measurable cost of production associated with reagents, power and waste neutralisation.
The process used to extract vanadium from residues, ashes, and spent catalysts uses different processing techniques to those for minerals and slags and depends on the characteristics of the raw material. many of these secondary materials contain several heavy metals that must be separated from each other once they have been extracted from the raw material.
Spent nickel-molybdenum and copper-molybdenum catalysts are treated chemically to separate the vanadium from cobalt, copper and nickel, and to convert the vanadium to oxide.
The spent catalysts are sodium-roasted at temperatures between 1500 – 1800 degrees Fahrenheit. The hydrocarbons and most of the sulphur are burned off, while the molybdenum and vanadium are converted to water-soluble sodium salts.
After roasting, the calcine is ground in a wet ball mill and leached with water to dissolve the molybdenum and vanadium compounds. Nickel and cobalt remain in an insoluble alumina concentrate. GCMC processes the concentrate in an electric arc furnace to produce high-grade fused alumina for refractory and abrasive applications, and nickel-cobalt alloys for refining.
The molybdenum-vanadium leach solution is ammoniated to selectively precipitate ammonium metavanadate, which is filtered and decomposed intovanadium pentoxide. the V2O5 is melted and quenched in a flaking wheel to produce fused vanadium pentoxide. The molybdenum filtrate from the vanadium production process is heated and acidified to precipitate molybdic acid. The molybdic acid is filtered and calcined to produce technical-grade molybdenum oxide. In a separate operation, part of th e molybdic oxide is converted into ammonium molybdate solutions and sold to catalyst manufacturers. The Below diagram shows the process used by Gulf Chemical and Metallurgical in the USA for the processing of spent oil refining catalysts.