How are vanadium-bearing ores roasted to produce sodium metavanadate?

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To produce sodium metavanadate from most vanadium-bearing ores or slags, the material is first crushed, ground, and screened. This prepared charge is then mixed with a sodium salt, such as sodium chloride or sodium carbonate. The mixture is subsequently roasted at approximately 850° C (1,550° F), a process that converts the vanadium oxides into sodium metavanadate, which can then be leached in hot water.1