temperature of 90℃, time of 30 min, and ratio of liquid to solid of 8.0 mL/g. Under the conditions, the leaching rate of vanadium reaches 89.5%. Those of ammonium carbonate leaching are: temperature of 60℃, time of 20 min, and ammonium carbonate content of 12%. Under the conditions, the leaching rate of vanadium reaches 90.2%. Compared with water leaching, vanadium leaching rate with ammonium carbonate is increased by 0.8%, leaching temperature shortened by 30℃, and leaching time reduced by 10 min. Only water-soluble vanadate is leached in water leaching liquid, while both water-soluble and water-insoluble vanadates are dissolved in ammonium carbonate solution. Key words: vanadium slag; high Ca/V ratio; sodium roasted slag; water leaching; ammonium carbonate leaching; leaching condition
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