Concentration of Cu(II), Co(II), and Ni(II) ions with N-(2-hydroxyethyl)alkyl amines

• Published in: Russian journal of non-ferrous metals 2012-02, Vol.53 (1), p.8-12
• Main Authors: Chekanova, L. G., Radushev, A. V., Nasrtdinova, T. Yu, Koltashev, D. V., Naumov, D. Yu
• Format: Article
• Language: English
• Subjects: Amines; Ammonia; Chemistry and Materials Science; Materials Science; Metallic Materials; Mineral Processing of Nonferrous Metals; Nonferrous metals; Optimization; Precipitation; Radicals; Recovery; Titration
• ISSN: 1067-8212; 1934-970X
• DOI: 10.3103/S1067821212010063

Regularities of the recovery of Cu(II), Co(II), and Ni(II) ions from ammonia solutions by N-(2-hydroxyethyl)alkyl amines (HEA), namely, regions of pH values of maximal recovery of M(II), the influence of the radical length in the HEA series, and precipitation time, were investigated. It is found by conductometric titration that the ratios in complexes are [Cu(II)] : [HEA] = 2 : 1, 1 : 1, and 1 : 2; [Co(II)] : [HEA] = 1 : 1 and 1 : 2; and [Ni(II)] : [HEA] = 1 : 1 and 1 : 2. Complexes of N -(2-hydroxyethyl)dodecyl amine with Cu(II) and Ni(II) ions are isolated and identified. Their composition is confirmed by the data of IR spectroscopy and elemental analysis. Using N -(2-hydroxyethyl)dodecylamine, a reagent of the HEA series,, which is optimal in regards to the totality of its properties, as an example, the effectiveness of compounds as collectors during the removal of nonferrous metals from waste waters by the ion flotation method is shown. The maximal degree of recovery of the M(II) ions from ammonia solutions by this method is 99.4% for Cu(II) ions ( C res = 0.34 mg/L), 96.8% for Co(II) ( C res = 1.55 mg/L), and 99% for Ni(II) ( C res = 0.60 mg/L).