Crystallization and Separation of Potassium Vanadate in Highly Concentrated Potassium Hydroxide Solution

Abstract:

The crystallization behavior of potassium vanadate from highly concentrated potassium hydroxide aqueous solution was investigated. The effect of various parameters including KOH concentration, V₂O₅ concentration, final crystallization temperature, cooling rate, stirring speed and additive amount of seed were examined. The optimal experimental conditions for K₃VO₄ crystallization were obtained as follows: KOH concentration 800850 g/L, KOH-to-V₂O₅ mass ratio 8~9, stirring speed 200 r/min, crystallization temperature from 80°C to 40°C with natural cooling, and seed addition 2% wt. Under optimal conditions, the K₃VO₄ crystallization yield of 87% was obtained, and the purity of crystals was about 90%.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 655-662
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.655
• Online since: November 2011
• Authors: Na Yang, Shi Li Zheng, Shao Na Wang, Ya Ling Qin, Wan Li Xie, Bing Jing Zhou, Yi Zhang
• Keywords: Crystallization, K₃VO₄, Sub-Molten Salt, Vanadium Slag

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