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Ammonia gas (NH3) is a clean energy, as well as an efficient reduction and nitridation agent. A novel process of reduction and nitridation with NH3 followed by magnetic separation and low‐temperature selective chlorination to deal with vanadium slag has been proposed. Vanadium spinel (V‐Fe spinel, FeV2O4) is the main V‐bearing phase in vanadium slag, and its reduction and nitridation behavior with...