PURIFICATION OF PREGNANT SOLUTION RESULTED FROM SPHALERITE CONCENTRATE EXTRACTION USING SULFATE ACID FOR ZINC OXYDE PRODUCTION
DOI:
https://doi.org/10.30556/imj.Vol22.No2.2019.1050Keywords:
pregnant solution zinc sulphate, zinc oxide, purification, solvent extraction, tripping, precipitation and calcinationAbstract
Purification of pregnant solution from sphalerite concentrate extraction using sulfate acid to produce zinc oxide was meant to prepare zinc oxide production technology utilizing existing internal sphalerite mineral raw material. The pregnant solution used to produce zinc oxide contains 29.84% zinc (Zn), with the biggest impurities iron (Fe) 11.68%. In order to obtain high purity zinc oxide, the pregnant solution should be recovered. It was done through solvent extraction method, in two process steps: extraction and stripping. The extraction was applying ligan bis di2ethylhexyle phosphate acid (D2EHPA) in toluene solvent, through ligan concentrate variation, pH and comparison of aqueous volume with organic volume (VA:Vo) and its excess. Stripping was carried out using sulphate acid through variation of concentration, pH and Vo:VA. To obtain optimum recovery, thus extraction and stripping should be carried out in many steps. The extractions and the strippings were calculated using McCabe Thiele diagram. Furthermore, zinc oxide was resulted from deposition and calcination of pure pregnant solution at temperature 700°C. Purification results show that the best extraction occurred at concentration D2EHPA 1 M, pH 3 and Vo:Va 2:1, through 4 step processes obtained recovery 97.50% with distribution coefficient 77.9; while the best stripping was obtained at H2SO4 concentration 2 M, VO:VA 2:1 through 3 step processes which obtained stripping percent 98.22% with stripping coefficient 1.51. On the other hand, zinc oxide solution resulted from purification was obtained Zn 93.31% in the form of hexagonal crystals (wurtzite).References
Arief, M. (2011) Sintesis dan karakterisasi nanopartikel seng oksida (ZnO) dengan metode pengendapan kimia basah dan hidrotermal untuk aplikasi fotokatalis. Universitas Indonesia.
Asadi, T., Azizi, A., Lee, J. and Jahani, M. (2018) ‘Solvent extraction of zinc from sulphate leaching solution of a sulphide-oxide sample using D2EHPA and Cyanex 272’, Journal of Dispersion Science and Technology, 39(9), pp. 1328–1334. doi: 10.1080/01932691.2017.1402338.
Balesini, A. A., Razavizadeh, H. and Zakeri, A. (2011) ‘Solvent extraction of zinc from acidic solution obtained from cold purification filter cake of angouran mine concentrate using D2EHPA’, Iranian Journal of Chemical Engineering, 8(3), pp. 43–47.
Gonzalez-Valls, I. and Lira-Cantu, M. (2009) ‘Vertically-aligned nanostructures of ZnO for excitonic solar cells: A review’, Energy Environ. Sci., 2(1), pp. 19–34. doi: 10.1039/B811536B.
Gupta, C. K. (2003) Chemical metallurgy: Principles and practice. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Habashi, F. (1997) Handbook of extractive metallurgy: Primary metals; secondary metals; light metals, Volume 2. Wiley-VCH.
Kertes, A. S. (1971) ‘The chemistry of solvent extraction’, in Recent Advances in Liquid–Liquid Extraction. Elsevier, pp. 15–92. doi: 10.1016/B978-0-08-015682-8.50006-7.
Kislik, V. S. (2011) Solvent extraction : Classical and novel approaches. 1st Ed. Elsivier.
Kołodziejczak-Radzimska, A. and Jesionowski, T. (2014) ‘Zinc Oxide-From Synthesis to Application: A Review’, Materials, 7(4), pp. 2833–2881. doi: 10.3390/ma7042833.
Moezzi, A., McDonagh, A. M. and Cortie, M. B. (2012) ‘Zinc oxide particles: Synthesis, properties and applications’, Chemical Engineering Journal, 185–186, pp. 1–22. doi: 10.1016/j.cej.2012.01.076.
Morkoç, H. and Özgür, Ü. (2009) Zinc oxide: Fundamentals, materials and device technology. 1st Ed. Wiley-VCH.
Nathsarma, K. C. and Sarma, P. V. R. B. (2003) ‘Solvent extraction of cobalt and zinc sulphate solutions using phosphoric, phosponic and phophinic acid’, The European Journal of Mineral Processing and Environmental Protection, 3(2), pp. 151–159.
Nyberg, J. (2004) Characterisation and control of the zinc roasting process. University of Oulu.
Sadraei, R. (2016) ‘A simple method for preparation of nano-sized ZnO’, Research & Reviews: Journal of Chemistry, 5(2), pp. 45–49.
Sigma-Aldrich (2018) ‘Price List of reagents and chemicals analytical and laboratory equipment items’. Sigma-Aldrich.
Singh, R. K. and Dhadke, P. M. (2002) ‘Extraction and separation studies of zinc(II) and copper(II) with D2EHPA and PC-88A from perchlorate media’, Journal of the Serbian Chemical Society, 67(1), pp. 41–51.
The Directorate General of Mineral and Coal (2015) Indonesia mineral and coal information. Jakarta: The Directorate General of Mineral and Coal.
Waddar, V. N. and Behera, J. K. (2010) Study of kinetics involved in oxidation of nonferrous metal sulphide. National Institute of Technology Rourkela.
Wang, Y., Ma, C., Sun, X. and Li, H. (2002) ‘Preparation of nanocrystalline metal oxide powders with the surfactant-mediated method’, Inorganic Chemistry Communications, 5(10), pp. 751–755. doi: 10.1016/S1387-7003(02)00546-4.
Wen-qing, Q., Zhuo-yue, L., Wei-zhong, L. and Guan_zhou, Q. (2003) ‘Selective extraction of zinc from sulfate leach solution of zinc ore’, Transactions of Nonferrous Metals Society of China, 13(6), pp. 1435–1439.
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