New collectors for Co(II) and Ni(II) removal from aqueous systems by flotation (DAF)

This paper presents the behaviour of a new collectors alkylhydroxamic type AH (C₇-C₁₄) in Co(II) and Ni(II) separation by ion and precipitate flotation starting from the collector functions, especially based on their tensioactive and complexing properties. The tensioactive properties of AH (C₇-C₁₄) were investigated by surface tension isotherms. The complexing reagent function was studied by the formation of insoluble species with Co(II) and Ni(II) followed by their separation using ion and precipitate flotation. The removal of AH-Co(II) and AH-Ni(II) complexes was made in order to recover the small quantities of Co(II) and Ni(II) from aqueous systems by flotation. The influencing factors were studied: pH, molar ratio (C_c:C_M(II), metallic ion concentration and foam processing. The M(II)-AH interaction was investigated using IR spectrometry, thermal analysis, chemical elementary analysis. The separation yields (%R > 95), the possibility of foam processing and finally metallic ion confirm the collector quality of the AH acids studied.