References
   -  S.J.O. White, F.A. Hussain, H.F. Hemond, S.A. Sacco, J.P. Shine,
    R.L. Runkel, K. Walton-Day, B.A. Kimball, The precipitation
    of indium at elevated pH in a stream influenced by acid
    mine drainage, Sci. Total Environ., 574 (2017) 1484–1491. 
-  H. Hasegawa, I.M.M. Rahman, Y. Egawa, H. Sawai,
    Z.A. Begum, T. Maki, S. Mizutani, Chelant-induced reclamation
    of indium from the spent liquid crystal display panels with the
    aid of microwave irradiation, J. Hazard. Mater., 254 (2013) 10–17. 
-  N.T.T. Dang, D.-M. Wang, S.-Y. Huang, K.T. Tran. Indium
    recovery from aqueous solution containing oxalic acid –
    Enhancement by using hydrophobic membranes, Sep. Purif.
    Technol., 235 (2020) 116300. 
-  D. Pradhan, S. Panda, L.B. Sukla, Recent advances in indium
    metallurgy: a review, Miner Process. Extr. Metall. Rev.,
    39 (2018) 167–180. 
-  H. Murakami, S. Ishihara, Trace elements of Indium-bearing
    sphalerite from tin-polymetallic deposits in Bolivia, China
    and Japan: a femto-second LA-ICPMS study, Ore Geol. Rev.,
    53 (2013) 223–243. 
-  J. Yang, T. Retegan, B.-M. Steenari, C. Ekberg, Recovery of
    indium and yttrium from Flat Panel Display waste using
    solvent extraction, Sep. Purif. Technol., 166 (2016) 117–124. 
-  S. Dhiman, B. Gupta, Cyphos IL 104 assisted extraction of
    indium and recycling of indium, tin and zinc from discarded
    LCD screen, Sep. Purif. Technol., 237 (2020) 116407. 
-  X.B. Li, C. Wei, Z.G. Deng, C.X. Li, G. Fan, H. Rong, F. Zhang,
    Extraction and separation of indium and copper from zinc
    residue leach liquor by solvent extraction, Sep. Purif. Technol.,
    156 (2015) 348–355. 
-  T. Kinoshita, Y. Ishigaki, S. Kitagawa, R. Ichino, Y. Kamimoto,
    Selective recovery of indium via continuous counter-current
    foam separation from sulfuric acid solutions II – Optimization
    of operational parameters on separation performance, Sep.
    Purif. Technol., 238 (2020) 116490. 
-  M. Martin, E. Janneck, R. Kermer, A. Patzig, S. Reichel,
    Recovery of indium from sphalerite ore and flotation tailings
    by bioleaching and subsequent precipitation processes, Miner.
    Eng., 75 (2015) 94–99. 
-  C. Kim, C.R. Lee, J. Heo, S.M. Choi, D.H. Lim, J. Cho, S. Chung,
    J.R. Kim, Spontaneous and applied potential driven indium
    recovery on carbon electrode and crystallization using a
    bioelectrochemical system, Bioresour. Technol., 258 (2018)
    203–207. 
-  X.B. Li, Z.G. Deng, C.X. Li, C. Wei, M.T. Li, G. Fan, H. Rong,
    Direct solvent extraction of indium from a zinc residue
    reductive leach solution by D2EHPA, Hydrometallurgy,
    156 (2015) 1–5. 
-  S.-K. Lee, U.-H. Lee. Adsorption and desorption property of
    iminodiacetate resin (Lewatit® TP207) for indium recovery,
    J. Ind. Eng. Chem., 40 (2016) 23–25. 
-  N. Kabay, J.L. Cortina, A. Trochimczuk, M. Streat, Solventimpregnated
    resins (SIRs) – methods of preparation and their
    applications, React. Funct. Polym., 70 (2010) 484–496. 
-  S.X. Bao, Y.P. Tang, Y.M. Zhang, L. Liang, Recovery and
    separation of metal ions from aqueous solutions by
    solvent-impregnated resins, Chem. Eng. Technol., 39 (2016)
    1377–1392. 
-  M. Paramanik, S. Panja, P.S. Dhami, J.S. Yadav, C.P. Kaushik,
    S.K. Ghosh, Unique reversibility in extraction mechanism
    of U compared to solvent extraction for sorption of U(VI)
    and Pu(IV) by a novel solvent impregnated resin containing
    trialkyl phosphine oxide functionalized ionic liquid, J. Hazard.
    Mater., 354 (2018) 125–132. 
-  S. İnan, H. Tel, Ş. Sert, B. Çetinkaya, S. Sengül, B. Özkan,
    Y. Altaş, Extraction and separation studies of rare earth
    elements using Cyanex 272 impregnated Amberlite XAD-7
    resin, Hydrometallurgy, 181 (2018) 156–163. 
-  Y.P. Tang, S.X. Bao, Y.M. Zhang, L. Liang, Effect of support
    properties on preparation process and adsorption performances
    of solvent impregnated resins, React. Funct. Polym.,
    113 (2017) 50–57. 
-  H.N. Kang, J.Y. Lee, J.Y. Kim, Recovery of indium from
    etching waste by solvent extraction and electrolytic refining,
    Hydrometallurgy, 110 (2011) 120–127. 
-  J.X. Yang, T. Retegan, C. Ekberg, Indium recovery from discarded
    LCD panel glass by solvent extraction, Hydrometallurgy,
    137 (2013) 68–77. 
-  M.K. Sinha, S.K. Sahu, P. Meshram, B.D. Pandey, Solvent
    extraction and separation of zinc and iron from spent pickle
    liquor, Hydrometallurgy, 147–148 (2014) 103–111. 
-  S.L. Wei, J.S. Liu, S.X. Zhang, X.L. Chen, Q.Q. Liu, L.L. Zhu,
    L. Guo, X.Y. Liu, Stoichiometry, isotherms and kinetics of
    adsorption of In(III) on Cyanex 923 impregnated HZ830 resin
    from hydrochloric acid solutions, Hydrometallurgy, 166 (2016)
    205–213. 
-  J.S Liu, X.Z. Gao, C. Liu, L. Guo, S.X. Zhang, X.Y. Liu,
    H.M. Li, C.P. Liu, R.C. Jin, Adsorption properties and
    mechanism for Fe(III) with solvent impregnated resins containing
    HEHEHP, Hydrometallurgy, 137 (2013) 140–147. 
-  Y.X. Yuan, J.S. Liu, B.X. Zhou, S.Y. Yao, H.M. Li, W.X. Xu,
    Synthesis of coated solvent impregnated resin for the adsorption
    of indium (III), Hydrometallurgy, 101 (2010) 148–155. 
-  X. Zhang, K. Zhou, Y. Wu, Q. Lei, C. Peng, W. Chen. Separation
    and recovery of iron and scandium from acid leaching
    solution of red mud using D201 resin, J. Rare Earth, 38 (2020)
    1322–1329. 
-  L.J. Wang, Y. Wang, L. Cui, J.M. Gao, Y.X. Guo, F.Q. Cheng,
    A sustainable approach for advanced removal of iron from
    CFA sulfuric acid leach liquor by solvent extraction with P507,
    Sep. Purif. Technol., 251 (2020) 117371. 
-  G.P. Hu, Y. Wu, D.S. Chen, Y. Wang, T. Qi, L.N. Wang, Selective
    removal of iron(III) from highly salted chloride acidic solutions
    by solvent extraction using di(2-ethylhexyl) phosphate, Front.
    Chem. Sci. Eng., (2020). https://doi.org/10.1007/s11705-020-1955-4. 
-  M.Y. Li, Z.M. He, L. Zhou, Removal of iron from industrial
    grade aluminum sulfate by primary amine extraction
    system, Hydrometallurgy, 106 (2011) 170–174. 
-  R.K. Mishra, P.C. Rout, K. Sarangi, K.C. Nathsarma, Solvent
    extraction of Fe(III) from the chloride leach liquor of low
    grade iron ore tailings using Aliquat 336, Hydrometallurgy,
    108 (2011) 93–99. 
-  L. Cui, Z.S. Zhao, Y.X. Guo, F.Q. Cheng, Stripping of iron(III)
    from iron(III)-loaded Aliquat 336 generated during aluminum
    recovery from coal waste leach liquor using sodium sulfite,
    Sep. Purif. Technol., 199 (2018) 304–310. 
-  K. Inoue, S. Alam. Hydrometallurgical recovery of indium
    from flat-panel displays of spent liquid crystal televisions, Jom,
    67 (2015) 400–405. 
-  S.V. Roosendael, M. Regadío, J. Roosen, K. Binnemans, Selective
    recovery of indium from iron-rich solutions using an Aliquat
    336 iodide supported ionic liquid phase (SILP), Sep. Purif.
    Technol., 212 (2019) 843–853. 
-  A. Agrawal, S. Kumari, K.K. Sahu, Studies on solvent extraction
    of iron(III) as a step for conversion of a waste effluent to a value
    added product, J. Environ. Manage., 92 (2011) 3105–3111. 
-  S.I. El Dessouky, Y.A. El-Nadi, I.M. Ahmed, E.A. Saad,
    J.A. Daoud, Solvent extraction separation of Zn(II), Fe(II), Fe(III)
    and Cd(II) using tributylphosphate and Cyanex 921 in kerosene
    from chloride, Chem. Eng. Process., 47 (2008) 177–183. 
-  C. Deferm, B. Onghena, T.V. Hoogerstraete, D. Banerjee,
    J. Luyten, H. Oosterhof, J. Fransaerc, K. Binnemans, Speciation
    of indium(III) chloro complexes in the solvent extraction
    process from chloride aqueous solutions to ionic liquids, Dalton
    Trans., 46 (2017) 4412–4421. 
-  X. Zhang, K. Zhou, Q. Le, Y. Huang, C. Peng, W. Chen, Selective
    removal of iron from acid leachate of red mud by Aliquat336,
    Jom, 71 (2019) 4608–4615. 
-  J.N. Wang, L. Xu, Y. Meng, C. Cheng, A.M. Li, Adsorption
	  of Cu2+ on new hyper-crosslinked polystyrene adsorbent:
	  Batch and column studies, Chem. Eng. J., 178 (2011) 108–114.