Fundamental Studies on the Collection of Sulphide Minerals with Xanthic Acids. II : Reactions of Formation of Heavy Metal Complexes with Xanthic Acids
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Spectrophotometric studies were made on the reactions of formation of Pb (II), Ni (II) and Co (II) complexes with ethyl xanthic acid and Co (II) complexes with methyl, n-propyl, n-butyl xanthic acids in acetone-water (1 : 1) solution. The effects of various factors affecting the reactions of formation of these complexes were studied and their compositions and formation constants were evaluated. Xanthic acid reacts with Pb (II), Ni (II) and Co (II) to form only one species of complex, respectively. The composition of Pb(II) complex with ethyl xanthic acid can be represented as 1 : 2, and those of all other complexes as 1 : 3. It may be considered that these complexes form four-membered chelates with two bidentate ligands. The formation constants of PbX_2 and NiX_3- complexes in acetone-water (1 : 1) solution were determined to be 1.83×10^8 and 0.90×10^<14>, respectively, at 25℃ and for an ionic strength of 0.5. The formation constants of Co (II) complexes with methyl, ethyl, n-propyl and n-butyl xanthic acids were determined to be 1.02×10^<12>, 0.98×10^<13>, 3.40×10^<13> and 4.53×10^<13> respectively. It was found that the logarithmic values of the formation constants of their complexes varied linearly with the values of pKa of xanthic acids. Further it was pointed out that the important relation existed between the effectiveness of xanthic acids as collectors in flotation and the values of the formation constants of their heavy metal complexes.
- 東北大学の論文
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関連論文
- Fundamental Studies on the Collection of Sulphide Minerals with Xanthic Acids. I : On the Dissociation and Decomposition of Xanthic Aicds
- Studies on the Flotation of Molybdenite. II : Some Experiments on the Kerosene Flotation
- Fundamental Studies on the Collection of Sulphide Minerals with Xanthic Acids. II : Reactions of Formation of Heavy Metal Complexes with Xanthic Acids
- Studies on the Flotation of Molybdenite. I : Flotation of Molybdenite Ore Containing Clayey Gangue