Browsing by Author "Gadzhov I."

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    Membrane electrochemical preparation of three-polyphosphate non-cyanide electrolyte for coppering
    (2015-01-01) Gadzhov I.; Lilova D.; Ignatova K.
    The membrane electrochemical technology for obtainment of three-polyphosphate non-cyanide electrolyte for coppering is developed and optimized. For the purpose of characterizing the selectivity of the ionic membranes used, the processes of mass transfer are examined through determining the transmission numbers of the ions in the three-chamber electrolyzer. Detailed balance of the voltage between the electrodes and quantitative evaluation of the anodic output on current during the membrane preparation of the electrolyte are made. It is found that Cu is actively solved without passivation up to current density ia = 8 A dm-2. The anodic polarization during the operation of the electrolyzer is insignificant and the current efficiency is close to 100 %. It is found that the optimal environment for the membrane preparation of the electrolyte is anolyte of 140 g dm-3 Na5P3O10 and citric acid C6H8O7 up to pH = 5.3, and catholyte solution of 380 g dm-3 Na2CO3.