Article

Journal of Applied Electrochemistry

, Volume 7, Issue 6, pp 495-500

First online:

Borate buffer equilibria in nickel refining electrolytes

  • B. V. TilakAffiliated withJ. Roy Gordon Research Laboratory, INCO, Ltd
  • , A. S. GendronAffiliated withJ. Roy Gordon Research Laboratory, INCO, Ltd
  • , M. A. MosoiuAffiliated withJ. Roy Gordon Research Laboratory, INCO, Ltd

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Abstract

Buffer capacity studies, carried out using pH titrations, demonstrated that electrolytes containing NiSO4 + H3BO3 + Na2SO4 buffer more effectively than in the presence of H3BO3 + Na2SO4. The increased buffer capacity is dependent on the concentration of both Ni2+ and H3BO3. Thermodynamic analysis of the pH titration data suggested the formation of a weak complex, Ni(H2BO3)2, (logK ∼ 3.8 to 4.9) between Ni2+ and H3BO3 in mixed chloride-sulphate electrolytes at 55° C.