Recovery of tungsten from spent selective catalytic reduction catalysts by pressure leaching

Joung Woon Kim; Won Geun Lee; In Sung Hwang; Jin Young Lee; Choon Han

Journal of Industrial and Engineering Chemistry, Vol.28, 73-77, August, 2015

DOI10.1016/j.jiec.2015.02.001 Export Citation

Recovery of tungsten from spent selective catalytic reduction catalysts by pressure leaching

Joung Woon Kim, Won Geun Lee, In Sung Hwang, Jin Young Lee¹, and Choon Han^†

Department of Chemical Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea
¹Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources, Daejon 305-350, Republic of Korea

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The recovery and purification of vanadium (V) and tungsten (W) from honeycomb-type spent selective catalytic reduction (SCR) catalyst was investigated using an autoclave through a pressure leaching process. Spent SCR catalyst mainly consists of TiO2 and other oxides (7.73% WO3, 1.23% V2O5, etc.). The reaction temperature, NaOH concentration, time, additive concentration, and liquid.solid (L/S) ratio were varied during the leaching process. The optimal reaction conditions were identified for recovery of V and W. The addition of NaOH to Na2CO3 improved the amount of V and W recovered because of the enhancing effect of NaOH in Na2CO3. As the concentration of CaCl2 was increased during the precipitation process in order to separate the recovered V and W, the precipitation percentages of V and W increased, respectively. However, the use of Ca(OH)2 as the additive reduced the precipitation percentage of W. Therefore, despite full precipitation of V (98.6%), only 7.73% of W was precipitated when 3 equivalents of Ca(OH)2 was reacted with spent SCR catalyst for 30 min. The remaining W in the leaching solution was reacted with NH4OH to form ammonium tungstate, which was converted to ammonium paratungstate through evaporation. Consequently, V and W could be recovered and separated successfully through the process in this study.

Keywords:Tungsten;Recovery;SCR catalyst;Autoclave;Pressure leaching process;Precipitation process

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[2] http://www.kores.net.

[3] Chen Y, Feng QM, Shao YH, Zhang GF, Ou LM, Lu YP, Int. J. Miner. Process., 79(1), 42 (2006)

[4] Gomez-Bueno CO, Spink DR, Rempel GL, Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci., 12B, 341 (1981)

[5] Gupta CK, Krishnamurthy N, Extractive Metallurgy of Vanadium, Elsevier Science Publishers, Amsterdam, 1992.

[6] Hairunnisha S, Sendil GK, Rethinaraj JP, Srinivasan GN, Adaikkalam P, Kulandaisamy S, Hydrometallurgy, 85, 67 (2007)

[7] Kar BB, Datta P, Misra VN, Hydrometallurgy, 72, 87 (2004)

[8] Luo L, Miyazaki T, Shibayama A, Yen W, Fujita T, Miner. Eng., 16(7), 665 (2003)

[9] Luo L, Kejun L, Shibayama A, Yen W, Fujita T, Shindo O, Katai A, Hydrometallurgy, 72, 1 (2004)

[10] Mohanty M, Rath PC, Bhattacharya IN, Paramguru RK, Miner. Proc. Extr. Metall., 120(1), 56 (2011)

[11] Paulino JF, Afonso JC, Mantovano JL, Vianna CA, Cunha JWSDD, Hydrometallurgy, 127-128, 121 (2012)

[12] Queneau PB, Huggins DK, Beckstead LW, US Patent 4,320,096 (1982).

[13] Redkin AF, Kostromin NP, Geochem. Int., 48, 1049 (2010)

[14] Wood SA, Vlassopoulos D, Geochim. Cosmochim. Acta, 53, 303 (1989)

[15] Shlewit H, Alibrahim M, Fuel, 85(5-6), 878 (2006)

[16] Zeng L, Cheng CY, Hydrometallurgy, 98, 1 (2009)

[17] Zhao Z, Li J, Wang S, Li H, Liu M, Sun P, Li L, Hydrometallurgy, 108, 152 (2011)

[18] Gao F, Yan W, Li Y, Shi M, Zhou Z, Huang D, J. Chin. Chem. Soc., 39, 1423 (2011)

[19] Meher SN, Padhi BK, Br. J. Appl. Sci. Technol., 1, 41 (2011)

[20] Free ML, Hydrometallurgy: Fundamentals and Applications, Wiley-TMS, Hoboken, NJ, 2013.

[21] Chen H, Wang H, Yang L, Xiao Y, Zheng M, Liu Y, Fu H, Int. J. Electrochem. Sci., 7, 4889 (2012)

[22] Deng CJ, Zhou L, Zhu HX, Ding J, Yuan WJ, Mater. Sci. Eng., 18, 1 (2011)

[23] Kim HR, Lee JY, Kim JS, J. Korean Inst. Resour. Recycl., 21, 65 (2012)

[24] Wiewioroski EI, US Patent 4,666,685 (1987).

[25] Zhao Z, Liang Y, Li H, Int. J. Refract. Hard Met., 29, 289 (2011)

[26] Padilla R, Sohn HY, Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci., 16, 707 (1985)

[27] Baumgartner SJ, Groot DR, J. S. Afr. Inst. Min. Metall., 114, 331 (2014)

[28] Khorfan S, Wahoud A, Reda Y, Polytech. Ser. Chem. Eng., 45, 131 (2001)

[29] Osseo-Asare K, Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci., 13, 555 (1982)

[30] Liu WP, Xu H, Yang XY, Shi XC, Miner. Eng., 24(14), 1580 (2011)