Effect of Precipitation Temperature and Solution pH on the Precipitation of Ammonium Metavanadate

Seo-Jin Heo; Rina Kim; Kyeong Woo Chung; Ho-Seok Jeon; Chul-Joo Kim; Ho-Sung Yoon

doi:10.7844/kirr.2021.30.6.3

All Issue

2021 Vol.30, Issue 6 Next Page

Research Paper

Effect of Precipitation Temperature and Solution pH on the Precipitation of Ammonium Metavanadate 침전온도 및 수용액 pH가 암모늄메타바나데이트 침전반응에 미치는 영향

31 December 2021. pp. 3-11

PDF XML

Abstract

In this study, the effect of the solubility of ammonium metavanadate and the decomposition ratio of ammonium ions on a precipitation reaction—the precipitation of ammonium metavanadate by adding ammonium chloride to a sodium vanadate solution—was investigated. As the precipitation temperature and pH increased, the decomposition ratio of ammonium ions increased, and the decomposition ratio was greater than 81% at 45 °C and pH 9.3. This was approximately four times higher than that at pH 8. The result of the precipitation reaction, in view of these two factors that significantly influence the precipitation reaction, was that the precipitation yield increased as the temperature increased. However, the effect of temperature was not significant above 35 ℃. A kinetic study of the precipitation reaction revealed that the activation energy of the reaction was 42.3kJ/mol. Therefore, considering the solubility of ammonium metavanadate, the lower the temperature, the better the vanadium recovery yield. Additionally, considering the decomposition of ammonium ions, the lower the pH of the aqueous solution, the more advantageous. However, at pH 8 or less, sodium polyvanadate is precipitated and the purity of vanadium oxide may reduce.

Keywords

Vanadium

Ammonium chloride

Precipitation

Ammonium metavanadate

Reaction rate

본 연구에서는 소듐바나데이트 수용액에 염화암모늄을 첨가하여 암모늄메타바나데이트를 침전시킬 때, 암모늄메타바나데이트의 용해도와 암모늄이온의 분해율이 침전반응에 미치는 영향을 알아보았다. 침전온도와 수용액 pH가 증가함에 따라 암모늄 이온의 분해율이 증가하였으며 45 ℃에서 수용액 pH 9.3일 때 분해율은 81% 이상으로 pH 8일 때와 비교하였을 때 약 4배 정도 증가하였다. 그러므로 침전 반응에 큰 영향을 미치는 침전온도와 수용액 pH 두 인자를 고려하여 침전반응을 수행한 결과, 침전온도가 증가함에 따라 침전속도가 증가하였으나 35 ℃ 이상에서는 침전온도의 영향이 크지 않았다. 침전반응 속도론적 고찰을 통하여 얻은 침전반응의 활성화 에너지는 42.3 kJ/mol이었다. 이와 같은 연구를 통하여 암모늄메타바나데이트의 용해도를 고려하였을 때 침전온도는 낮을수록 바나듐 회수율에 유리하였다. 또한 암모늄 이온의 분해를 고려하였을 때 수용액의 pH는 낮을수록 유리하나 pH 8 이하에서는 소듐폴리바나데이트가 침전되며 바나듐 산화물의 순도 저하가 야기될 수 있었다.

키워드

바나듐

염화암모늄

침전반응

암모늄메타바나데이트

반응속도

References

Burwell, B., 1961 : Extractive metallurgy of vanadium, JOM, 13(8), pp.562-566. 10.1007/BF03378099

Shlewit, H., and Alibrahim, M., 2006 : Extraction of sulfur and vanadium from petroleum coke by means of salt- roasting treatment, Fuel, 85(5-6), pp.878-880. 10.1016/j.fuel.2005.08.036

Moskalyk, R. R. and Alfantazi, A. M., 2003 : Processing of vanadium: A review, Minerals Engineering, 16(9), pp. 793-805. 10.1016/S0892-6875(03)00213-9

Agarwal, D. C., Nigam, P. C., and Srivastava, R. D., 1978 : Kinetics of vapor phase oxidation of methyl alcohol over supported V₂O₅ K₂SO₄ catalyst. Journal of Catalysis, 55(1), pp.1-9.

Mandhane, P. G., Joshi, R. S., Ghawalkar, A. R., et al., 2009 : Ammonium metavanadate: A mild and efficient catalyst for the synthesis of coumarins, Bulletin of the Korean Chemical Society, 30(12), pp.2969-2972. 10.5012/bkcs.2009.30.12.2969

Arya, A., Tripathy, P. K., and Bose, D. K., 1994 : Thermal decomposition of ammonium metavanadate in a fluidized bed reactor, Thermochimica Acta, 244, pp.257-265. 10.1016/0040-6031(94)80225-4

Navarro, R., Guzman, J., Saucedo, I., et al., 2007 : Vanadium recovery from oil fly ash by leaching, precipitation and solvent extraction processes, Waste Management, 27(3), pp.425-438. 10.1016/j.wasman.2006.02.00216563726

He, D., Feng, Q., Zhang, G., et al., 2007 : An environmentally-friendly technology of vanadium extraction from stone coal, Minerals Engineering, 20(12), pp.1184-1186. 10.1016/j.mineng.2007.04.017

Yoon, H. S., Heo, S. J., Kim, C. J., et al., 2020 : Precipitation Characteristics of Ammonium Metavanadate from Sodium Vanadate Solution by Addition of Ammonium Chloride, Journal of the Korean Institute of Resources Recycling, 29(5), pp,28-37.

Du, G., Sun, Z., Xian, Y., et al., 2016 : The nucleation kinetics of ammonium metavanadate precipitated by ammonium chloride, Journal of Crystal Growth, 441, pp. 117-123. 10.1016/j.jcrysgro.2016.02.016

Wellinger, A., Murphy, J. D., and Baxter, D., 2013 : The biogas handbook: science, production and applications, pp.512, Elsevier Publishing, Amsterdam. 10.1533/9780857097415

Wen, Y., Mao, Y., Kang, Z., et al., 2019 : Application of an ammonium ion-selective electrode for the real-time measurement of ammonia nitrogen based on pH and temperature compensation, Measurement, 137, pp.98-101. 10.1016/j.measurement.2019.01.031

Smith J. M., Van Ness, H. C., Abbott, M. M., 2005 : Introduction to Chemical Engineering Thermodynamics, seventh ed. McGraw-Hill, New York.

Dean, J. A., 1998 : Lange's Handbook of Chemistry, 13th ed. McGraw-Hill, New York.

Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 30
No :6
Pages :3-11
Received Date : 2021-09-30
Revised Date : 2021-11-04
Accepted Date : 2021-11-09
DOI :https://doi.org/10.7844/kirr.2021.30.6.3

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

All Issue