JPS594046Y2 - Cover structure for electrolytic cell - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cover structure for an electrolytic cell.

Electrolytic operations for electrolytic refining and electrowinning of nonferrous metals are often carried out with the temperature of the electrolyte solution considerably higher than room temperature.

For example, in electrolytic refining of copper, the anode and cathode are suspended in an electrolytic solution, which is a mixture of copper sulfate and sulfuric acid, and a large current is passed through the process. be done.

In such high temperature electrolysis operations, a large amount of heat is removed by the steam evaporating from the electrolyzer, for example up to 80% of the total dissipated heat.

Further, when the gas generated during electrolysis escapes from the electrolytic cell into the atmosphere, mist is generated, resulting in environmental pollution.

In electrolytic plants, many unit electrolytic cells are often arranged side by side to form one large multi-cell electrolytic cell, and in this case the situation becomes even more serious.

In order to avoid such inconveniences, a large number of tanks are covered at once to suck out the mist.

Furthermore, in order to prevent the generation of mist, measures have been taken to float a liquid soap such as paraffin on the surface of the electrolyte in the tank.

Furthermore, a float made of thin polystyrene or the like may be floated on the surface of the electrolyte.

However, the method of floating liquid substances such as paraffin requires time and effort to clean the deposits after lifting the product, and when cleaning the electrolytic cell, it is necessary to remove it from the tank, which is a very troublesome process. It is.

The method of using a float also requires the tedious work of collecting the float and returning it to the tank when replacing the anode, and the electrolyte surface is not sufficiently covered, and some of the floats that flow out may leak into the filter or pump. It has drawbacks such as clogging and entrainment in the electrodeposited layer.

On the other hand, if a cover is placed all at once, the mist will adhere to the terminals of the electrode plates, which can easily cause poor contact, and if lead is used as an insoluble anode, the ears will soften and fall off due to the rise in temperature of the ears. A situation could arise.

Furthermore, if the entire upper surfaces of a large number of electrolytic cells are covered all at once, it is very troublesome as it becomes necessary to remove the covers each time the terminals are periodically inspected.

In addition, attempts have been made to place a plastic sheet directly on the upper edge of the electrodes of each electrolytic cell so as to open the side wall of the electrolytic cell, but this method is not fully effective in preventing mist generation and retaining heat, and the mist suction equipment It is also difficult to provide

The present invention eliminates the conventionally recognized drawbacks of covers that collectively cover a large number of electrolytic cells, thereby creating a multi-vessel type cover structure that is more effective in preventing rim formation and retaining heat than the unit-vessel covering sheet described above. I will provide a.

In the present invention, frame frames made of pipes or the like are installed across the top surface of a large number of electrolytic cells, for example eight, and a single cover covers all eight frames.

The cover is notched so that it can hang down from the pedestal between the long sides of the unit electrolytic cell, and in this case the hanging edge of the cover is made to just fit over the ears of the electrode plates.

A suction port is formed near the center inside the cover.

With this configuration, the cover covers only the gas generating part of the electrolytic cell, leaving the ears of the electrode plates open.

Since the ears are open, ambient air can enter through the ears, which prevents contamination of the electrode plate ears by mist.
Prevent increase in contact resistance.

Further, the ear is cooled by the intrusion of ambient air through the ear, and softening of the ear is prevented.

Since the insulator between the walls of the unit electrolytic cell is exposed with the cover on, there is no need to remove the cover for each inspection.

Since the mist is sucked through the suction port, there is virtually no problem of environmental pollution.

In this way, the present invention provides a cover structure that collectively covers a plurality of unit electrolytic cells, includes a pedestal that is installed across each unit electrolytic cell, and a cover that covers all of the pedestals. A cover that includes a cover that hangs down from a stand along each long side of the tank so that the hanging edge of the cover hangs over the ears of the electrode plates in the unit electrolytic tank, and a suction port provided in the cover. Provide a structure.

The present invention will be explained with reference to the drawings.

FIG. 1 shows a part of a multi-cell electrolytic cell 1 in which a large number of unit electrolytic cells are arranged side by side.

The unit electrolytic cell is A,, A2...A5...
It is shown as follows.

A large number of electrode plates constituting the anode and the cup 2F are alternately housed in the unit electrolytic cell.

Busbars 2 are arranged on both sides of the unit electrolytic cell, generally in contact with which the anode is suspended by its ears and the cathode is suspended by a ribbon.

In the drawing, only the anode is shown as 10 for the sake of simplicity.

A pedestal 4 is installed across the top surface of each unit electrolytic cell.

The pedestal is, for example, a stainless steel pipe frame structure, and is shown as consisting of four pedestals 5 provided on both end side walls of the unit electrolytic cell and a horizontal support member 6 connecting their upper ends.

Appropriate reinforcement is strung between the supports.

A cover 20 is placed over these frames.

FIG. 2 shows a top view of the cover 20 covering a plurality of frames.

Here, the cover 20 is shown as having a size that covers eight unit electrolytic cells.

The size of the cover is not limited to this, but is determined to be an appropriate size in consideration of the arrangement of the unit electrolytic cells to be covered, handling of the cover, etc.

The cover 20 is suitably cut along the longitudinal side of the pedestal 4 so that it can hang down therefrom, and after it is placed over the pedestal 4, it hangs down like a curtain along the longitudinal side of the pedestal.

The drooping curtain portion is shown at 21 in FIG.

The lower edge 22 of the curtain portion 21 is made to just fit over the ears of the anode 10.

This aspect is illustrated in FIG.

The lower edge 22 of the curtain 21 is designed to fit exactly over the ears of the anode 10 and the beam of the cathode 11 to reduce the gap leading to the inside of the electrolytic cell as much as possible.

An appropriate number of suction ports 25 are provided within the cover 20.

Although the suction port 25 may be attached directly to the cover, in consideration of workability, it is convenient to attach it at an appropriate location within the cover and separated from the cover.

If the cover is sized for eight tanks as shown in the figure, one suction port is sufficient.

During operation, mist is suctioned through the suction port 25.

Accordingly, ambient air enters through the open ears as shown by arrows in FIG. 3, thereby preventing the ears from being contaminated by mist and cooling the ears.

In this way, poor contact due to mist adhering to the electrode plate terminals is prevented, and softening and falling off of the ears due to temperature rise is effectively prevented.

Since the cover according to the present invention substantially covers the upper part of the liquid surface of the electrolytic cell, it has a sufficient heat retention effect.

The cover can be applied and removed onto the rack using a winding and unrolling device running over the cell.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a portion of the cover structure according to the present invention, FIG. 2 is a top view of the eight-vessel force bar structure, and FIG. FIG. 2 is an enlarged view of the portion indicated by X in FIG. 2 to show the aspect thereof. 1: Multi-cell electrolytic cell, A1 to A8: Unit electrolytic cell, 10 near nodes, 2: Sparker, 11: Cathode, 4: Frame, 2
0: Cover, 21: Cover curtain part, 22: Lower edge of curtain.

Claims (2)

[Scope of utility model registration request] (1) A cover structure that collectively covers a plurality of unit electrolytic cells, including a pedestal installed across each unit electrolytic cell, and a cover that covers all of the pedestals, on each long side of the unit electrolytic cell. A cover structure comprising: a cover whose hanging edge hangs down from a pedestal along a side so as to cover an ear of an electrode plate in a unit electrolytic cell; and a suction port provided in the cover. (2) The cover structure according to claim 1, wherein the cover is made of a noncombustible vinyl sheet.