Device and method for analytical control of the content of iron(III) ions in the iron plating electrolyte and plant for electrochemical regeneration of iron plating electrolyte with automatic control

摘要

The invention relates to a plant for electrochemical regeneration of iron plating electrolyte with automatic control, to a device and a method for analytical control of the content of iron(III) ions in the iron plating electrolyte and can be used in the electroplating industry for reconditioning of worn-out parts of machines and mechanisms.The plant, according to the invention, comprises a regeneration unit (11), in which is located a volume-porous flow-through foam nickel cathode (12) and an anode (14), separated by a diaphragm (13) forming the anode space and the cathode space, connected to a galvanic bath (8) through a recirculation pipeline (10), to which is connected a device for analytical control of the content of iron (III) ions through the working electrolyte metered inlet branch pipe and the produced colloidal solution outlet branch pipe, coupled with a flow-through nephelometer (16). The device includes a cylindrical pH electrocorrector (1), in the lower part of which is placed a flow diaphragm electrolyzer, and in the upper part - a mixing unit, in which are placed a pH-meter sensor (6) and a gummed spherical loading of barium hexaferrite (5), and on the outer part is placed a solenoid (7). At the same time, the pH-meter sensor and the nephelometer of the given device are connected to the inputs of the pH-meter amplifier (18) and of the nephelometer amplifier (17), and their outputs - to the input of a comparator (24), the output of which is connected in series to the input of a voltage regulator (25) and to a rectifier (26), the second output of the pH-meter amplifier (18) is connected to the input of another comparator (19), connected to a setting device (20), the output of which is connected in series to an independent voltage regulator (21) and to a rectifier (22).The method, according to the invention, consists in that electrolyte samples are selected in a continuous mode, is added an alkaline reagent, produced by electrochemical generation of OH- ions, at a pH of 3.5…4.1, with the formation of the colloidal iron hydroxide (III) precipitate, which concentration is then determined according to the optical density by the nephelometric analysis at a wavelength of 342 nm.