CN102230197A

CN102230197A - Starting method of magnesium electrolytic cell

Info

Publication number: CN102230197A
Application number: CN2011101782661A
Authority: CN
Inventors: 周天华; 姜宝伟; 郭晓光; 王石金; 姚云广; 周月坤; 方晓春; 吕强
Original assignee: ZUNBAO TITANIUM CO Ltd
Current assignee: ZUNBAO TITANIUM CO Ltd
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2011-11-02
Anticipated expiration: 2031-06-29
Also published as: CN102230197B

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

A kind of startup method of closing down magnesium electrolysis bath

Technical field

The present invention relates to the magnesium eletrolysis technical field, particularly the startup method of multipolarity closing down magnesium electrolysis bath.

Background technology

The multipolarity electrobath start method of current electrolysis method production MAGNESIUM METAL is: add pre-configured high-temperature electrolysis matter (about 900 ℃) in the electrolyzer that possesses entry condition, treat that ionogen did not have negative electrode 1/3 place directly to begin progressively to send the direct current heating; Continue to add ionogen to the standard liquid level.This method main drawback has: the 1. upright impact cell lining that connects of high-temperature electrolysis causes the damage of liner; 2. do not have negative electrode 1/3 from adding ionogen to ionogen, need be consuming time more than 40 minutes under the normal circumstances, electrolyte temperature reduces, and bottom of electrolytic tank crusts easily; 3. send in the direct current process, the temperature of anode more than the electrolyte levels is higher, the easy oxidation damage of anode; 4. liquid level is different with the lower electrode heating degree with top electrode and liquid level, makes the electrode stress concentration, even distortion; 5. add in the ionogen process, the chlorine that electrolysis produces overflows from leading the magnesium mouth, pollutes.

Summary of the invention

For solving the problem in the existing multipolarity closing down magnesium electrolysis bath start-up course, the invention provides a kind of startup method of closing down magnesium electrolysis bath, at first in the middle part of multipolarity closing down magnesium electrolysis bath tank room bottom and collection magnesium chamber, respectively establish one group of ac electrode, the two arrays of electrodes independent control, during electrobath start, add pre-configured ionogen, do not have tank room bottom ac electrode, promptly begin to give this electrode alternating-current; Continue to add ionogen and stop to negative electrode bottom following 50mm～60 mm, be heated to 680 ℃～700 ℃ also constant temperature more than 4 hours; Then add ionogen to the standard liquid level, treat that ionogen the ac electrode that does not collect middle part, magnesium chamber, promptly begin to give this electrode alternating-current, be heated to 700 ℃ and constant temperature direct current startup after 2 days.

The advantage of closing down magnesium electrolysis bath AC starting has:

1, ionogen did not have the tank room ac electrode to get final product feeding temperature-raising, can adopt the ionogen below 800 ℃ to start electrolyzer, avoided the shock heating damage of liner; Bottom of electrolytic tank is difficult for crust simultaneously.

2, electrolyte levels not contacts electrode be constant temperature more than 4 hours, fully preheating DC electrode, greatly reduced ionogen before the submergence electrode because direct current generates the excessive electrode stress concentration that causes of heat, help prolonging electrode life.

3, owing to do not send direct current, the above temperature of anode of liquid level is unlikely too high, and oxidation can be too not serious; Simultaneously can not produce the chlorine contaminate environment.

4, high constant temperature ionogen further to the cell lining dehydration, obtains direct current entry condition preferably to the even preheating in each position in the electrolyzer.

Description of drawings

Fig. 1 is the startup method synoptic diagram of a kind of closing down magnesium electrolysis bath of the present invention.

Among the figure: 1-tank room, 2-collection magnesium chamber, 3-negative electrode, 4-ac electrode, 5-standard liquid level.

Embodiment

Below in conjunction with accompanying drawing content of the present invention is done further detailed saying

A kind of startup method of closing down magnesium electrolysis bath, at first in multipolarity closing down magnesium electrolysis bath tank room 1 bottom and the collection 2 middle parts, magnesium chamber respectively establish one group of ac electrode 4, the two arrays of electrodes independent control, during electrobath start, add pre-configured ionogen, do not have tank room 1 bottom ac electrode 4, promptly began to give this electrode alternating-current; Continue to add ionogen and stop to the following 50mm in negative electrode 3 bottoms～60 mm, be heated to 680 ℃～700 ℃ and constant temperature more than 4 hours; Then add ionogen to standard liquid level 5, treat that ionogen the ac electrode that does not collect 2 middle parts, magnesium chamber, promptly begin to give this electrode alternating-current, be heated to 700 ℃ and constant temperature direct current startup after 48 hours.

Adopt method of the present invention to start electrolyzer, bottom of electrolytic tank does not crust basically, produces magnesium and converges well, and cathode current distribution is even, measures each anodic current distribution and all meets the demands and be more or less the same in 0.1 kA, and effect is better.

Claims

1. the startup method of a closing down magnesium electrolysis bath, it is characterized in that: at first in the middle part of multipolarity closing down magnesium electrolysis bath tank room (1) bottom and collection magnesium chamber (2), respectively establish one group of ac electrode (4), the two arrays of electrodes independent control, during electrobath start, add pre-configured ionogen, no tank room (1) bottom ac electrode (4), promptly began to give this electrode alternating-current; Continue to add ionogen and stop to negative electrode (3) bottom following 50mm～60 mm, be heated to 680 ℃～700 ℃ also more than the constant temperature (4) hour; Then add ionogen to standard liquid level (5), treat that ionogen did not have the ac electrode (4) at middle part, collection magnesium chamber (2), promptly begin to give this electrode alternating-current, be heated to 700 ℃ and constant temperature direct current startup after 48 hours.