Starting method of magnesium electrolytic cell

Abstract

The invention relates to a starting method of a magnesium electrolytic cell. Specifically, the bottom of an electrolysis chamber (1) in a multipolar magnesium electrolytic cell and the central section of a magnesium collection chamber (2) are respectively provided with a set of AC (alternating current) electrodes (4), and the two sets of electrodes are separately controlled. When the electrolytic cell is started, electrolyte prepared in advance is added to submerge the AC electrodes (4) located at the bottom of the electrolysis chamber (1), so that alternating current of the electrodes is to be delivered. The electrolyte is added continuously until reaching a position of 50mm-60mm below a cathode (3) bottom, and is heated to a temperature of 680-700DEG C and maintained at a constant temperature for more than 4 hours. Then, the electrolyte is added to a standard liquid level (5), and when the AC electrodes (4) located at the central section of a magnesium collection chamber (2) are submerged by the electrolyte, alternating current of the electrodes is delivered. After the electrolyte is heated to a temperature of 700DEG C and maintained at a constant temperature for 48 hours, direct current is sent to start the electrolytic cell. For an electrolytic cell started with the method of the invention, the bottom of the electrolytic cell is free of incrustation, and the generated magnesium can gather well. Distribution of cathode current is uniform and distribution of anode current is also measured to be uniform. Thus, the adoption of the method provided in the invention can have a good effect.

Description

technical field [0001] The invention relates to the technical field of magnesium electrolysis, in particular to a starting method for a multipolar magnesium electrolytic cell. Background technique [0002] At present, the start-up method of the multi-polar electrolytic cell for the production of metal magnesium by electrolysis is: add a pre-configured high-temperature electrolyte (about 900°C) into the electrolytic cell that meets the start-up conditions, and start to send the electrolyte gradually after the electrolyte is submerged in 1 / 3 of the cathode. Direct current heating; continue to add electrolyte to the standard level. The main disadvantages of this method are: ①The high-temperature electrolyte directly impacts the lining of the electrolytic cell, resulting in damage to the lining; ②It usually takes more than 40 minutes from the time the electrolyte is added until the electrolyte is submerged in 1 / 3 of the cathode, and the temperature of the electrolyte decreases. ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems in the start-up process of the existing multipolar magnesium electrolytic cell, the present invention provides a starting method for the magnesium electrolytic cell. Electrodes, two sets of electrodes are controlled separately. When the electrolytic cell is started, add the pre-configured electrolyte, and then start to send the alternating current to the electrode when it passes through the AC electrode at the bottom of the electrolytic chamber; continue to add electrolyte until it stops at 50 mm to 60 mm below the bottom of the cathode, and heat to 680 ℃ ~ 700 ℃ and constant temperature for more than 4 hours; then add electrolyte to the standard liquid level, when the electrolyte is submerged in the AC electrode in the middle of the magnesium collection chamber, start to send alternating current to the electrode, heat to 700 ℃ and keep the temperature for 2 days, then DC start

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