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- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received October 4, 2022
Revised February 12, 2023
Accepted March 7, 2023
- Acknowledgements
- This work was financially supported by National Science and Technology Support Program of China (Grant no. 2015BAB19B02)
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Implication of hydrolysis on vanadium precipitation with acidic ammonium salt from high concentration of alkaline vanadium solution
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Abstract
Vanadium precipitation with acidic ammonium salt is widely applied in industrial practice of vanadium
pentoxide production. However, the ammonia wastewater produced in the precipitation process and resultant environmental issues have been paid increasing attention. With the intention of reducing wastewater and extra cost, an
enhancement in the vanadium content of basic qualified solution is the most directly effective method. Unfortunately,
high vanadium concentration brings about a low precipitation rate and a high Na content in ammonium polyvanadate, as a result of hydrolysis existence in the precipitation process. The effect of hydrolytic vanadium reaction on acidic
ammonium salt precipitation has rarely been reported. Therefore, the whole precipitation process, including the effect
of pH value, reaction temperature and vanadium concentration on precipitation result were clarified by analyzing the
thermodynamic form of vanadate radicals in this work. Simultaneously, a study on technological parameters was inquired
based on the theoretical analysis. The phase composition and crystal morphology of precipitates were also inspected
using XRD and SEM-EDS. The results show the negative reaction of vanadium hydrolysis cannot be eliminated in the
process of vanadium precipitation with acidic ammonia salt. When vanadium content is higher than 35 g/L, Na in APV
is easy to exceed 0.6%. Na mainly precipitates in V2O5·H2O in the formation of amorphous body or chemical absorption. The results in this work provide a fundamental guide for the application of high concentration vanadium precipitation technology
Keywords
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