electrolytic cell

Sulfur analyzerelectrolytic cellIt is mainly a device that converts electrical energy into chemical energy. The volume is about 400ml, and a pair of electrolytic electrodes and a pair of indicator electrodes are fixed and led out on the upper cover. The electrolytic electrode area of the electrolytic cell is 1 × 1.5m2. The electrolytic cathode electrode is placed at the center of the electrolytic cell, and the electrolytic anode electrode is placed at the edge of the electrolytic cell to facilitate the diffusion of the generated iodine as soon as possible. The indicator electrode area is 0.3 × 25px2. After the combustion of the material in the furnace, the released gas enters the glass melting plate gas filter through a quartz tube from above the electrolytic cell, and is sprayed into a fine mist to be fully dissolved in the electrolyte. The stirrer drives the stirring rod to evenly stir the electrolyte, and the faster the stirring speed (about 1000r/min), the more stable it is

One electrolytic cell malfunction and solution:

(1) The upper cover of the electrolytic cell needs to be tightened, the sealing ring is aging, and there is glue opening at various inlet and outlet holes, all of which are causes of air leakage.
(2) There are four electrode plates in the electrolytic cell, with two smaller ones in each group serving as indicator electrodes and two larger ones serving as electrolytic electrodes. The indicator electrode plays a role in sensing the titration of the electrolyte and controlling the electrolytic electrode for titration. If any electrode malfunctions, it will cause the experiment to be unable to proceed. So, it is necessary to ensure the cleanliness of the surfaces of the four pole pieces, and the sealing area must not crack.
　　
If the indicator electrode is disconnected from its lead (such as when the sealing adhesive cracks), it will cause the electrolytic electrode to continue electrolysis and cannot be stopped. The electrolyte turns red, and the screen counts quickly (even without coal samples), resulting in surface fouling. If the electrolysis electrode is disconnected from its lead, it will cause the electrolyte to become increasingly white during sample preparation, but the screen will not count, which is equivalent to the electrolysis switch being turned off. The surface fouling is manifested as delayed electrolysis, that is, electrolysis only suddenly opens when the liquid is very white, and the measurement results are seriously low and unstable.
　　
Solution: For surfaces that are sticky, they can be cleaned. For those that break due to glue breakage, the residual glue can be removed, the plastic tube connected to the pole piece can be removed, the inner wall can be cleaned, the corroded lead part can be replaced, re welded, and sealed. Do not seal the crack with glue, as the electrolyte may have accumulated inside and the lead has been corroded, making it non-conductive with the pole piece.

Installation and leak detection of two electrolytic cells:
Use a screwdriver to remove the four screws on the cover of the electrolytic cell, place the stirring rod into the electrolytic cell, cover it, tighten the screws, cover the rubber stopper, turn on the power switch of the purification device, adjust the air flow rate to 1000mL/min, and then close the two-way valve between the combustion tube and the electrolytic cell. If the air flow rate drops below 500mL/min, it proves that the air tightness is good. Otherwise, check all components and their interfaces.

Attention: Different models of electrolytic cells have different connections, and incorrect connections may result in incorrect electrolysis during experiments.