CONTINUOUS ELECTROLYSIS METHOD BY MEANS OF ELECTROLYTIC BATH FOR POLYSULFIDE MANUFACTURING, AND ELECTROLYSIS DEVICE FOR IMPLEMENTING SAME

摘要

An electrolysis method and a device therefor, which achieve a stable continuous operation and prevent the influence of scale that can deposit within the system over time, are provided for an electrolysis system that carries out the electrolysis of white liquor used in a cooking step in a kraft pulp method, which is a pulp production method, in order to electrolytically produce polysulfide through oxidation of sodium sulfide in the white liquor. The electrolysis method of preventing the voltage of an electrolytic bath from rising over time without halting electrolysis and the electrolysis device for executing the method implement are provided such that: in operation of a two-compartment electrolytic bath, which has a membrane partitioning an anode compartment from a cathode compartment and in which a sulfide ion-containing white liquor for use in a pulp production process is fed into the anode compartment while direct current is supplied to the electrolytic bath to produce polysulfide in the anode compartment through electrolysis, and a sulfide ion-containing white liquor for use in a pulp production process that contains at least one of a scale cleaning agent and a scale inhibitor is fed to the anode compartment.