Abstract
Electrochemical bleaching of sulphite pulp was carried out by using NaCl solution as an electrolyte. At pH 10, a temperature of 35 °C and a pulp consistency of 2%, the rate of bleaching was found to increase with increasing current density and salt concentration. The power consumption ranged from 0.4 to 3.3 kW h per kilogram of pulp, depending on the current density or salt concentration. The addition of 0.02% K 2Cr 2O 7 increased the degree of bleaching by 6% and the current efficiency by 7% with no deterioration effect on the pulp quality.
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