How is vanadium leached from roasted sodium metavanadate?

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After roasting vanadium-bearing ores or slags with a sodium salt (such as sodium chloride or sodium carbonate) at approximately 850° C (1,550° F) to convert the oxides into sodium metavanadate, the resulting material is leached using hot water.1

Once the vanadium has been dissolved into the hot water, the leachate is typically acidulated with sulfuric acid to precipitate the vanadium as sodium hexavanadate, commonly referred to as red cake.1