Recycling of Ammonia Wastewater During Vanadium Extraction from Shale |
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| Authors: | Qihua Shi Yimin Zhang Tao Liu Jing Huang |
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| Affiliation: | 1.School of Resource and Environmental Engineering, Hubei Provincial Engineering Technology Research Centre of High Efficient Cleaning Utilization for Shale Vanadium Resource and Hubei Province Collaborative Innovation Centre for High Efficient Utilization of Vanadium Resources,Wuhan University of Science and Technology,Wuhan,People’s Republic of China;2.School of Resource and Environmental Engineering,Wuhan University of Technology,Wuhan,People’s Republic of China |
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| Abstract: | In the vanadium metallurgical industry, massive amounts of ammonia hydroxide or ammonia salt are added during the precipitation process to obtain V2O5; therefore, wastewater containing a high level of NH4+ is generated, which poses a serious threat to environmental and hydrologic safety. In this article, a novel process was developed to recycle ammonia wastewater based on a combination of ammonia wastewater leaching and crystallization during vanadium extraction from shale. The effects of the NH4+ concentration, temperature, time and liquid-to-solid ratio on the leaching efficiencies of vanadium, aluminum and potassium were investigated, and the results showed that 93.2% of vanadium, 86.3% of aluminum and 96.8% of potassium can be leached from sulfation-roasted shale. Subsequently, 80.6% of NH4+ was separated from the leaching solution via cooling crystallization. Vanadium was recovered via a combined method of solvent extraction, precipitation and calcination. Therefore, ammonia wastewater was successfully recycled during vanadium extraction from shale. |
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