Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1999-02-18
2000-10-10
Gorgos, Kathryn
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204244, 204245, C25C 300
Patent
active
061298212
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a metallic Mg electrolyzing device for forming metallic Mg by electrolysis of molten salts containing chloride of Mg, in particular, to a metallic Mg electrolyzing device provided with a plurality of electrolytic cells, Cl.sub.2 gas produced as a byproduct therein being collectively sucked.
2. Discussion of the Background
A metallic Mg electrolyzing device industrially used for forming metallic Mg by electrolysis of molten salts containing chloride of Mg uses a plurality of electrolytic cells, in each of which formation of metallic Mg is carried out simultaneously. And with the formation of metallic Mg, Cl.sub.2 gas is produced as a byproduct in each electrolytic cell. The Cl.sub.2 gas produced as a byproduct in each electrolytic cell is collectively sucked by use of an aspirator installed in the main pipe through branch pipes and transported to a Cl.sub.2 gas refining equipment.
In such a metallic Mg electrolyzing device provided with a plurality of electrolytic cells, in order to improve current efficiency and decrease electric power consumption rate, it is important to control the suction pressure for sucking Cl.sub.2 gas in each electrolytic cell to a slight negative pressure of -10 to 0 mmH.sub.2 O (-0.1 to 0 kPa). The reason is that, if the suction pressure becomes higher, the ratio of the atmospheric air mixed into electrolytic cell is increased, which leads to reducing current efficiency.
In the prior art, however, since negative pressure was not controlled individually in each electrolytic cell, the suction pressure for sucking Cl.sub.2 gas in each electrolytic cell was not controlled to -10 to 0 mmH.sub.2 O, which caused reduction in current efficiency.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a metallic Mg electrolyzing device provided with a plurality of electrolytic cells, wherein negative pressure control is performed individually in each electrolytic cell to achieve promotion of current efficiency.
The possible methods of individually controlling the suction pressure for sucking Cl.sub.2 gas in each electrolytic cell is to install an aspirator in each electrolytic cell and to install an aspirator in the main pipe while equipping each branch pipe branching out from the main pipe with an automatic valve. The former method in which an aspirator is installed in each electrolytic cell is not desirable because piping is more complicated by such a method. However, if the latter method in which an automatic valve is equipped for each branch pipe is adopted, it is not easy to individually control negative pressure in each electrolytic cell. The reasons are as follows.
In each electrolytic cell, chloride in the form of powder is produced with the production of Cl.sub.2 gas. Since this chloride causes clogging in the pipes, the piping construction needs to be simple. This is why gas from each electrolytic cell is collectively sucked with an aspirator installed in the main pipe. One possible method of individually controlling suction pressure in each electrolytic cell while collectively sucking gas from each electrolytic cell is to equip each branch pipe with an automatic valve. However, if a valve is equipped for the pipe for sucking Cl.sub.2 gas, chloride is adhered to the valve or its surroundings, which causes malfunction of the valve in a short period of time. Therefore, in the prior art, even if individual control of negative pressure in each electrolytic cell is intended, it is difficult to perform it, and as a result, reduction in current efficiency is unavoidable.
In the light of the above difficulties, the present inventors have been considering preventive measures against clogging caused by chloride at each automatic valve when each branch pipe is equipped with an automatic valve. As a result, it has been found that, when using a gate type automatic valve, clogging caused by chloride hardly occurs. Further, it has been found that, though an automatic valve i
REFERENCES:
Derwent English Abstract of JP 09125281 A, published May 13, 1997.
Alcan International Limited
Gorgos Kathryn
Nicolas Wesley A.
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