Abstract
The electrolytic de-arsenication of technical grade phosphoric acid 85 wt % by cathodic deposition in order to produce chemically pure phosphoric acid was examined. Polarization curves using Cu, Pb, 316L stainless steel and graphite as cathodic rotating discs were determined. The best results were achieved for copper where the arsenic deposition takes place in a range of potentials without hydrogen evolution. Long term experiments in a laboratory batch reactor with a rotating cylinder cathode of copper showed that the electrodeposited arsenic was a non-conductor, poorly adherent and can be detached from the electrode by means of an ultrasonic cleaner. Experimental results with a pilot plant reactor with a three-dimensional cathode of copper nets showed a high degree of scatter. However, typical values of the figures of merit are: fractional conversion per pass 24%, specific energy consumption 250 kWh kg−1 As for a volumetric flow rate of 1.5 dm3 min−1 at 60 A and 3.4 V of cell voltage.
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