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Removal of cadmium from phosphoricm acid solution by solvent-impregnated resins
Phosphoric acid, used in fertilizers Is mostly produced by the wet process by making phosphate rocks react with H2S04. Phosphate rocks contain a variety of heavy metals such as Cr, Cd, Cu, Mn, Ni, U, Zn. Production of phosphate fertilizer without eliminating these toxic heavy metals could cause soil or ground water contamination and surface water pollution. Cadmium is definitely an undesirable element in fertilizers, although current fertilizer use presents no immediate danger. Cyanex 302 (bis [2,4, 4-trimethyl pentyl] mono thiophosphinic acid) has been used as an extractant for the preparation of solvent-impregnated resins (SiRs). The impregnation was performed by employing macroporous Diaion HP-l0 and HP-1MG polymer matrices. The removal of Cd (II) from phosphoric acid solution has been studied as a function of impregnation ratio (g-Cyanex 302/ g-polymer adsorbent) and type of polymer matrix. Optimum conditions for batchwise extractions of Cd(II) from H3P04 soiution (40 percent) were obtained.
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CADMIUM, CHELATEUR, ENGRAIS PHOSPHATE, SOLVANTCiter cet article
Kabay N., Gizli N., Demircioglu M., Arda M., Yüksel U. Removal of cadmium from phosphoricm acid solution by solvent-impregnated resins. In : Camarda D. (ed.), Grassini L. (ed.). Coastal zone management in the Mediterranean region. Bari : CIHEAM, 2002. p. 71-76. (Options Méditerranéennes : Série A. Séminaires Méditerranéens; n. 53). http://om.ciheam.org/om/pdf/a53/03001734.pdf