DE2135873A1 - CELL TOP FOR AMALGAM HIGH LOAD CELLS - Google Patents

Description

C. CONEADTY, NÜBNBEKG July 16, 1971

TJP Irg / -PA 3 / H4

Cell top for amalgam high-load cells

The quantities of chlorine gas developed in the high-current loaded chlor-alkali electrolysis cells at the anode must be removed from the electrode area as quickly as possible for energy reasons. It is well known that if the chlorine gas bubbles linger in the electrode area, the cell voltage increases significantly and the current yield decreases. This phenomenon, known under the collective term "gas bubble effect", has led to changes in the design of the graphite anodes in recent years. For example, the anode plates have been provided with numerous slots and gas outlet holes, which has actually brought the desired success up to current densities of D. e 10 kA / m. However, the ceramic-like graphite anode gradually stands in the way of a further increase in the current density. At very high current densities, D ^ greater than 10 kA / m, it becomes difficult to get the chlorine gas evolved from the underside of the horizontal anode plate, which is itself plentifully slotted and provided with a large number of gas outlet holes, quickly enough. The result is higher overvoltage on the graphite and greater voltage losses in the electrolyte enriched with chlorine gas bubbles. In addition, the internal resistance, the graphite loss and the transporter sensitivity of the anodes increase with the number of slots and gas vent holes. Attempts are made to circumvent this limitation by using coated titanium anodes. Using the cell top, which is matched to the stem-shaped graphite anode, expensive titanium anodes are used which, however, do not fully take into account the possibilities of this new, activated electrode material. Since the current feed and distribution of the anode is still located inside the cell and must therefore also be made of resistant titanium, large amounts of this expensive material are required, which has hindered the widespread use of this anode up to now. In addition, the retention of the old cell superstructure and the stamp-shaped anode forw the constructions contains inherent disadvantages.

- 2 -

2 0 9 8 8 4 / I 1 S 3

With its numerous, sometimes very short-lived individual parts, such as rubberized cell covers, busbars, flexible power distribution cables, anode holding rods, protective tubes, sealing elements, screw and / or soldered contacts, anode suspensions and the actual anodes, the cell superstructure has remained extremely expensive and complicated. Long, the ^T ffiderstand increasing 3tromwege, numerous voltage costing contacts and the power supply and power distribution aggravating anode support rods _f, the Strorabahnen be very sensitive constricted in those meanings Spannungsbeiwert blank (k value) of the electrolytic cells hardly fall below 0.12. Because of the large dimensional tolerances that have hitherto been common in cell construction. If titanium anodes are used in these cells, a complex, lengthy and labor-intensive adjustment process always takes place when assembling the metal anodes. Even the replacement of the individual anode distribution by.motor group adjustment has; no remedy brought here.

The present invention is based on the object, a with To create a cell top equipped with metal anodes, in which

1. the power supply and distribution made of conventional conductor material (Aluminum or copper) in the form of longitudinal beams with a large cross-section reaching up to the actual anode, around the resistance-increasing constriction of the current paths avoid,

2. the amount of titanium is limited to a minimum,

3. the actual anode is easy to replace,

4. the adjustment of the individual anode during assembly is not necessary,

5. the distance between the mercury cathode and the actual one Anode is very small and can be adjusted very precisely in order to keep the voltage drop in the electrolyte very small, and

6. the overall structure is durable and uncomplicated and meets all other requirements of an economical high-load operation is fully fair.

- 3 209884/115: 1

These tasks are carried out in a particularly advantageous manner by the Cell top according to the invention solved.

This cell top part with automatically adjustable support structure consists of current leads and distributors, shielded from the inside of the cell, made of copper or aluminum in the form of conductor material of side members, underlying contact strips made of valve metal , a welded cell shield made of valve metal sheet and attached to the contact strips, easily replaceable Coated valve metal anode bars. In some embodiments with anode grids, it may prove useful prove to use short contact pins made of the same material instead of the contact strips made of valve metal.

Some embodiments of the present invention are exemplified below with reference to the accompanying drawings described.

FIG. 1 shows a section through an amalgamoid load cell in perspective Representation equipped with the cell top according to the invention.

Pigur 2 shows the attachment of the contact strip (2) with the Longitudinal beam (1) using expansion bolts.

Pigur 3 shows the attachment of the contact strip (2) to the U-shaped longitudinal member (1) by means of screws.

Figure 4 shows the attachment of the contact strip (2) to the M angular longitudinal beam (1) by means of screws.

Pigur 5 shows the attachment of the contact strip (2) with the Longitudinal support (1) from below with corrosion-resistant screws and seals, with additional contact smittel (5) is used.

ligur 6 shows the attachment of the contact strip (2) with the Longitudinal beam (1) by means of a press fit.

pifur 7 shows the connection between the side members (1) and Contact strip (2) with an enlarged contact area, whereby -: - i äer contact through a low melting point is improved.

? 0 9 8 8 W 1 1 6 3 " ⁴ "

Figure 8 shows the connection between the contact strip (2) and anode rods (4) by means of clamping screws (8), wherein a contacting agent (7) is also used »

FIG. 9 shows the attachment of individual pins (9) Anode rods (4) on the contact strips (2) by means of a press fit.

Figure 10 shows the attachment of individual anode rods (4) the contact strips (2) by means of a grooved pin (10).

FIG. 11 shows the attachment of individual anode bars (4) to the contact strips (2) by means of snap pins (11).

FIG. 12 shows the attachment of individual anode bars (4) to the edge of the contact strips (2) by means of snap pins (11).

Figure 13 shows the attachment of individual anode rods (4) to the contact strips (2) by means of wedges (12) made of durable Material.

FIG. 14 shows the upside down cell upper part equipped with anode grids (13).

FIG. 15 shows another embodiment of an enlarged contact surface as shown in FIG.

Figure 16 shows the attachment of the anode grids (13) to the Contact strips (2) with countersunk screws.

FIG. 17 shows the attachment of the anode grids (13) to the contact strips (2) by means of a press fit.

FIG. 18 shows anode grids (13) which are arranged in the longitudinal direction and which are welded to the contact strips (2).

Figure 19 shows an anode grate (13), which consists of parallel There are webs (14) which open at their ends into a frame (15) which is attached to the contact strips (2) is attached.

- 5 -209884/11 S3

Figure 20 shows an anode grate (13), which is made up of parallel There are webs (14) which are interrupted by transverse strips (16) which are attached to the contact strips (2) will.

FIG. 21 shows a section of an anode grate (13) which is a slotted sheet metal.

Pigur 22 shows a section of an anode grate (13), which is a slotted sheet metal with the webs (14) the cathode form an angle of 90 °.

Pigur 23 shows a section of an anode grate (13) ι at which the openings between the webs (14) without mate | rial losses produced and.

Pigur 24 shows a section of an anode grate (13), which is a perforated sheet metal with the holes without Loss of material are made.

Figures 25 and 26 show a section of an anode grate »(13),

in which the webs (14) and transverse strips (16) consist of valve metal semi-finished products and with one another are welded.

Pigur 27 shows a section through an embodiment in which the anode rods (4) are arranged parallel to the mercury flow direction A , the anode rods (4) additionally being contacted via a transversely arranged auxiliary bridge (17).

Pigur 28 shows an embodiment of the cell top according to the invention with contact pin (2a).

Pigur 29 shows an anode grate (13) with transverse strips (16), at where the gas vent holes are parallel to the direction of mercury flow to run.

Identify the positions indicated in the figures explained above the following components ι

Item 1 »Longitudinal beam made of aluminum or copper conductor material

209884/11 S3 _ ₆ _

- D -

Item 2 = Item 2a = Item 3 = Item 4 = Item 5 =

Contact strip made of valve metal Contact pin made of valve metal Cell shield made of valve metal sheet Anode rods made of coated valve metal Oxidation-inhibiting contacting agent or contact-improving metal

Pos. 6 = low-melting alloy, e.g. B. Solder, Lipowitz alloy, Wood metal

Pos. 7 = contacting means such as coating made of platinum metal, silver, antioxidant paste Clamp screw eη

pegs attached to the anode rods grooved pins attached to the anode rods rigid pegs attached to the anode rods wedges made of durable material easily exchangeable anode grids made of coated valve metal
Ridges of the anode earth
Frame of the anode grids
Horizontal stripes of the anode grids. Auxiliary bridge

In Figure 1, the cell top according to the invention is also automatic adjustable support structure from inside the cell shielded current leads and distributors made of conductor material Copper or aluminum in the form of side members (1), underlying contact strips (2) made of valve metal, one welded to it Cell shielding (3) made of valve metal sheet and easily replaceable anode rods attached to the contact strips (2) (4) made of coated valve metal shown schematically. The cell top according to the invention allows the from the very good electrically conductive materials aluminum or copper made of longitudinal members (1) at a short distance from the Arrange anode rods (4) and thus the supply of the amount of electricity required for electrolysis with a minimal voltage drop to enable. The very thin contact strips (2) made of valve metal, preferably titanium, tie up the current paths

20988A / 1153 " ⁷ "

Item 8th Item 9 Item 10 Item 11 Item 12th Item 13th Item 14th Item 15th Item 16 Item 17th

not one and lead to considerable titanium savings without the to increase electrical resistance.

In the figures 2-4 there are three embodiments made of conductor material produced longitudinal beams (1) are shown, which allow Versehrauben with the contact strips (2) from above. Another possibility is to use the contact strips (2) to be screwed from below to the side rails (1) (Figure 5). Since the screws in this execution form with the electrolyte in the are in constant contact, they must be made of corrosion-resistant material, preferably valve metal, and additionally be sealed. Another connection option between the longitudinal member (1) and contact strip (2) can be made by means of a press | seat, as shown in Figure 6.

A reduction in the contact resistance results from an enlarged contact area between the contact strip (2) and Side member (1). This enlargement of the contact area can be achieved by a favorable design of the surfaces, as they are Toothing (Figure 16) represents achieve. The same effect also have wave-like or lamellar shaped contact surfaces. In the embodiment shown in Figure 7, the enlargement of the Contact area reached.

In some cases it is necessary to prevent oxidation of the valve metal contact surface during long operating times expedient, the contact surface between the longitudinal member (1) and contact strip (2) with relatively noble metals and / or to provide an anti-oxidant paste.

Mainly in the embodiments with an enlarged contact area is obtained with an additional contact between the side members (1) and the contact strips (2) via a low melting alloy (6), e.g. B. Lot, a further decrease in the contact resistance. The melting point of this alloy can also be below the operating temperature of the electrolyte cell in order to ensure that the cavities are evenly filled.

209884/1153 - 8 -

In the figures 8-13 different embodiments of the Connection between contact strip (2) and anode bars (4) is shown. Figure 8 shows the attachment of the anode rods (4) in the prefabricated recesses in the contact strip (2) using clamping screws (8). Other embodiments exist in that pins (Figure 9, Item 9) or grooved pins (Figure 10, Item 10) of the anode rods (4) in holes in the contact strip (2) are pressed in. A very simple attachment can be made using snap pins (Figures 11 + 12, Item 11). On the anode bars (4) Hollow pegs are attached, the cavity of which is provided with an explosive charge. When assembling these snap pins are in for it provided holes in the contact strip (2) introduced. Fastening takes place depending on the height of the holes in the contact strips (2) of the explosive pin either mainly via a press fit (as shown in FIG. 11) or via a hollow rivet-like one Connection (Figure 12). As shown in FIG. 12 on the embodiment with a snap pin (11), those in the figures 9 and 10 connections shown on the tape of the contact strip (2) take place. The attachment of the anode rods can also be done with Wedges (12) are made of resistant materials such as valve metal or plastic (Figure 15).

The valve metal surfaces that come into contact with the cell medium passivate with anodic use with the formation of non-conductive oxide layers. · Contact surfaces where one Contact with the cell medium cannot be completely ruled out, must be protected by additional contact means will. Layers of platinum metal, silver, antioxidant paste, etc. act as additional contacting means Contacting means are shown in Figure 8 by position 7 when using clamping screws; but they can too are used for the other types of fastening.

The A.noae rods (4) of the cell top according to the invention are made made of valve metal that is provided with coatings that enable the anode process to be carried out economically. The term "anode bars" is not limited to bars only

- 9 - 209884/1153

with circular. Cross-section, but any cross-section, z. B. square, triangular, hexagonal, rectangle, etc. can be used.

If the anode rods (4) are to be arranged parallel to the direction of mercury flow, additional contact via a A transversely arranged auxiliary bridge (Figure 27, Item 17) is possible.

In Figure 14 is a further embodiment of the inventive Cell upper part with automatically adjustable support structure, which consists of power lines and distributors shielded from the inside of the cell Made of copper or aluminum conductor material in the form of side members (1), underlying contact strips (2) made of valve metal, | a welded cell shield (3) made of valve metal sheet and easily replaceable anode grids (13) attached to the contact strips (2) are made of coated valve metal, shown. The connection between the longitudinal beam (1) and the contact strip (2) is expediently carried out in a way that ' as described in the first embodiment.

The anode grids (13) can be fastened to the contact strips (2) by means of a screw connection (FIG. 16), the Contact surface between contact strip (2) and anode grate (13) is additionally coated with platinum metal. As further embodiments come the previously mentioned types of fastening by means of pins (Figure 17), grooved pins, snap pins and | Wedges in question. In the embodiments with anode grids, significantly fewer connecting elements can be used between contact strips (2) and anode grids (13) can be used than in the embodiments with anode bars. To anyway during operation The contact surfaces are to ensure a safe and economical supply of electricity to the anode grids provided with one of the already mentioned contacting means. Another safe supply of electricity to the anode grids is through a metallic connection between the anode grate and Given contact strip. A welded connection is suitable for this (Figure 8). Since there are only a few connection points here as well

- 10 -

209884/1153

. - ίο -

is, the anode grids can be replaced by the welded joint using a suitable tool, e.g. B. Cut-off saw, solves. ITm when changing a processing of the To avoid contact strips (2), the webs (14) of the new anode grids are welded to the contact strip in an offset manner. That's why for this purpose, anode grates are produced with different spacings between the cross members (16). Then it is only after repeated replacement reworking of the contact strip required.

Some embodiments of the anode grids, which illustrate the present invention, but are in no way intended to restrict it, are shown in Figures 19-26. Figure 19 shows one Embodiment of an anode grate made of webs (14) arranged in parallel with a frame (15), while in FIG. 20 an embodiment is shown with horizontal stripes (16). The attachment of the anode grids (13) to the contact strips (2) by means of one of the connections described above takes place on the frame (15) or on the transverse strips (16). When using Expanded metal as the anode grate is given the mechanical strength by welding to a frame (15) or equivalent Transverse strips (16) made from semi-finished valve metal. Anode grids made from one piece are shown in FIGS. 19-24 shown. If the anode grids are made from valve sheet metal, the openings can be opened with (see Figures 19-22) or without any loss of material (see FIGS. 23-24). FIGS. 19-21 show anode grids made from slotted valve metal sheets. By turning the webs one obtains much larger openings with the same anode surface, which lead to that the chlorine gas bubbles are discharged from the electrode area as quickly as possible. It has been shown that the webs are expedient should form angles of 30 - 90 ° with the cathode. An embodiment in which the angle is 90 ° is shown in FIG Figure 22 shown. In Figure 23, a further embodiment with a cross bar (16) is shown. In this embodiment the openings are created by bending the web edges without loss of material. The shape of an anode grate shown in FIG. 24 can also be produced without loss of material by one z. B. by means of a pointed tool punches holes in a valve metal sheet without deburring the holes afterwards.

209884/14 53 - ¹¹ -

Of course, a commercially available sheet metal can also be used instead of this sheet metal Perforated sheet metal can be used, which is provided with horizontal strips to achieve mechanical strength.

In Figures 25 and 26 anode grids (13) are shown, the webs (14) and transverse strips (16) consist of valve metal semi-finished products which are welded to one another. In the same way you can too Make anode grids (13), the webs (14) and frame (15) of which are made of welded semi-finished valve metal products.

All anode grids described above may be provided either on one side or on both sides with a coating which enables an economical implementation of the i anode process.

To enlarge the "true anode area", a further Embodiment the webs of the anode grids completely or at least consist of sintered, activated valve metal on their surface and be welded to the frame or transverse strips.

FIG. 28 shows a third embodiment of the cell upper part according to the invention for amalgam high-load cells with current leads and distributors shielded from the inside of the cell made of copper or aluminum conductor material in the form of longitudinal members (1), underlying contact bolts (2a) made of valve metal, a cell cover (3) welded to it. made of valve metal sheet and on % the contact bolts (2a) attached, easily replaceable anode grids (13) made of coated valve metal. The connection between the longitudinal beam (1) and contact bolt (2a) or contact bolt (2a) and anode grate (13) is expediently carried out in the same way as in the previous embodiments. This embodiment with contact bolts (2a) leads to a further saving of valve metal and thus to a reduction in manufacturing costs. Due to the large conductor cross-section of the short contact pins (2a), the increase in the cell voltage due to the unavoidable constriction of the current paths is insignificant in this embodiment. the

- 12 -

209884/1153

Anode grids (15) are designed in the same way as in the second embodiment described above.

In the case of the two embodiments, the upper cell part according to the invention with anode grids (15), the webs (14) of the anode grids (15) can be arranged transversely or parallel to the direction of mercury flow will. The arrangement and design of anode grids with frames in which the webs are parallel to the direction of mercury flow can be seen from FIG. The design of anode grids in which the webs are transverse to the direction of mercury flow run, is shown in Figure 19 on an anode grate with frame (15) and in Figures 16 and 20 on an anode grate with transverse strips (16) shown. FIG. 29 shows an anode grate (15) with transverse strips (16), the webs (14) of which are parallel to the direction of mercury flow are arranged.

In the case of the cell top part according to the invention, the power supply and distribution is made from the very good conductive material copper or aluminum, which saves a lot of titanium. By using the much cheaper and better ones Conductive conductor materials, it is economically viable to dimension the power supply lines and distributors generously. Through the Ample dimensioning of the conductor cross-section and the short distances to the actual anode is achieved with this cell top an excellent stress coefficient is achieved. The better the stress coefficient, the lower the operating costs.

In all embodiments of the cell top part according to the invention, excellent plane parallelism is due to the construction of the anode surfaces. Due to the plan parallelism a very small distance between the mercury cathode and anode is possible, resulting in a very small voltage drop in the Electrolyte results .. This plane parallelism of the anode surface is retained even when the anode rods or anode grids are exchanged, because it is construction-related when the exchange anodes are installed the connecting pieces located on them in the recesses provided for this in the contact strip or the contact bolt intervene and thus an automatic adjustment of the

- 15 209884 / 11-5 3.

Anode surface result. The complex and lengthy adjustment process in the conventional assembly of metal anodes is thus omitted when using the cell top according to the invention, ^ spit this time-consuming adjustment was it with the conventional Stamp anodes very difficult to maintain the plane parallelism during the entire service life. Plane parallelism of the anode surface but is one of the most important prerequisites for safe operation of the amalgam cells because of the unevenness of the anode surface are frequent causes of short circuits.

The anode rods and anode grids of the cell top according to the invention are washed around by the electrolyte on all sides and therefore the electrolysis process can take place on the entire coated surface the anodes take place. As a result, the production capacity can be increased while the space requirement remains the same.

The construction of the cell top according to the invention allows the anode rods or anode grids to be designed so that the The generated chlorine gas is removed from the electrode area as quickly as possible will. This largely prevents the undesired influence of the so-called gas bubble effect.

By largely replacing the previous one for the power supply line and distribution needed valve metals due to the much cheaper ones Conductor materials copper or aluminum result in a drastic saving in titanium and thus a considerable reduction the investment costs.

One source of interference in the previous cell superstructure is the numerous Seals required in the cell lid, which must be constantly maintained and checked. In the case of the erfinduhgsgemäße In the construction, such or similar wear parts are not required. Thus, the overall structure of the invention Cell upper part for amalgam high-load cells durable and uncomplicated and therefore meets all the requirements of an economical high-load operation.

claims 209884/1153

Claims (36)

Patent claims: 1. Cell shell for amalgamation cells with automatic adjustable support structure, characterized by current leads and distributors shielded from the inside of the cell made of copper or aluminum conductor material in the form of longitudinal members (1), contact strips (2) underneath Valve metal, a welded cell shield (3) made of valve metal sheet and attached to the contact strips, easily exchangeable anode rods (4) made of coated valve metal. 2. Cell upper part according to claim 1, characterized in that the side members acting as current feeders and distributors (1) have a profile that enables the contact strip (2) to be screwed tight from above. 3. cell top according to claim 1, characterized in that the contact strips (2) by means of valve metal screws equipped with seals from below on the side members (1) are attached. 4. Cell upper part according to claim 1 to 3, characterized in that the side members acting as current feeders and distributors (1) and contact strips (2) have profiles that result in an enlarged contact area, e.g. B. Toothing, Wavy line, slats. 5. cell top according to claim 1, characterized in that the contact strips (2) via press fits with the longitudinal members are connected. 6. Cell upper part according to claim 1 to 5, characterized in that the contact strips (2) on the carrier side with a contact-improving one Metal (5) are coated. 7. cell upper part according to claim 1 to 5, characterized in that, that the contact strips (2) are coated on the carrier side with an oxidation-inhibiting contacting agent (5). 209884/1153 A $ 8. cell top according to claim ι to 6, characterized in that that the contact between the side member (1) and the contact strip (2) is additionally improved by a low-melting alloy (6) will. 9. Cell upper part according to claim 1 to 8, characterized in that the contact strip has recesses on the anode side and the anode rods against them with the help of clamping screws (8) are pressed. 10. cell top according to claim 1 to 8, characterized in that the contact strips (2) contain recesses on the anode side, are fitted into the pins (9) of the anode rods (4). 11. Cell upper part according to claim 1 to 8, characterized in that that the contact strips (2) have recesses on the anode side, into which the grooved pins (10) of the anode rods (4) are pressed. 12; Cell top according to Claims 1 to 8, characterized in that the contact strip (2) has recesses on the anode side, with the snap pins (11) of the anode rods (4) press fit result. 13. Cell upper part according to claim 1 to 8, characterized in that the contact strip (2) has recesses on the anode side, in which the anode rods (4) by means of a wedge (12) made of resistant material, e.g. B. valve metal, plastic, are stigt. φ 14. Cell upper part according to claim 9 to 13 »characterized in that that the contact between the contact strip (2) and anode bars (4) is additionally provided by a contacting means (7), such as B. coating of platinum metal, silver, antioxidant paste, etc., is improved. 15. Cell top for amalgam high load / cells with automatic adjustable support structure, characterized by current leads and distributors shielded from inside the cell Conductor material copper or aluminum in the form of side members (1), underlying contact strips (2) made of valve metal, 2098 8 4/115 a "cell shield (3) made of valve metal sheet" welded to it and easily exchangeable anode grids (13) made of coated valve metal and fastened to the contact strips (2). 16. Cell top according to claim 15, characterized in that the connection between the longitudinal member (1) and contact strip (2) according to the manner shown in claims 2 to 8 is carried out. 17. Cell upper part according to claim 15 and 16, characterized in that that the contact strip (2) is coated on the anode side with platinum metal and the anode grids (13) are screwed to it. 18. Cell upper part according to claim 15 and 16, characterized in that that the contact strips (2) on the anode side contain recesses (7) into which the pins (9) of the anode grids (13) are pressed are. 19. Cell upper part according to claim 15 and 16, characterized in that that the connection between contact strips (2) and anode grids (13) is carried out in the manner mentioned in claims 11 to 14 is. 20. Cell upper part according to claim 15 and 16, characterized in that that the contact strip (2) is welded to the anode grids (13). 21. Cell upper part according to claim 15 to 20, characterized in that that the anode grate (13) consists of parallel webs (14) which open at their ends in a frame (15) which is attached to the contact strips (2). 22. Cell upper part according to claim 15 to 20, characterized in that that the anode grate (13) consists of webs (14) arranged in parallel and interrupted by transverse strips (16), the Transverse strips (16) are attached to the contact strips (2). 23 cell top according to claim 21 and 22, characterized in that that webs (14) and frame (15) or webs (14) and transverse strips (16) are made from one piece. 20988A / 1 1 S3 24. Cell upper part according to claim 21 to? 3, characterized in that that the anode grate (13) is a slotted sheet metal. 25. Cell upper part according to claim 21 to 23, characterized in that that the anode grate (13) is a slotted plate in which . the webs (14) form angles of 30 to 90 ° with the cathode. 26. Cell upper part according to claim 21 to 23, characterized in that that the anode grate (13) is a perforated sheet metal. 27. Cell upper part according to claim 21 to 26, characterized in that that the anode grate (13) is a sheet metal in which the openings are produced without loss of material. 28. Cell upper part according to claim 21 to 23, characterized in that the anode grate (13) consists of expanded metal. i 29. Cell upper part according to claim 21 and 22, characterized in that that the webs (14) and frame (15) or transverse strips (16) consist of semi-finished products and are welded to one another. 30. Cell upper part according to claim 21 and 22, characterized in that that the webs (14) consist entirely or at least their surface of sintered valve metal and with the frame (15) or the transverse strips (16) are welded. 31 cells shell for amalgam high load cells with automatically adjustable support structure, characterized by the shielded from the cell interior current feed and distributor of wire, material of copper or aluminum in the form of longitudinal beams (1), i underlying stud (2a) of valve metal, a welded thereto cells shield ( 3) made of valve metal sheet and easily replaceable anode grids (13) made of coated valve metal and fastened to the contact bolts (2a). 32. cell top according to claim 31, characterized in that the connection between the longitudinal beam (1) and contact bolt (2a) according to the manner shown in claims 2 to 8 is carried out. • A 209 884/1153 33. Cell upper part according to Aii & pruch 51 and 32, characterized in that that the connection between the contact bolt (2a) and the anode grids (13) is carried out in the manner mentioned in claims 17 to 20 is. 34. Cell upper part according to claim 31 to 33, characterized in that that the anode grate (13) is designed in the manner mentioned in claims 21 to 30. 35. Cell upper part according to claim 1 to 34, characterized in that that the anode rods (4) or the webs (14) of the anode grids (13) are arranged transversely to the direction of mercury flow. 36. Cell upper part according to claim 1 to 34, characterized in that that the anode rods (4) or the webs (14) of the anode grids (13) are arranged parallel to the mercury flow direction, wherein the anode rods (4) are additionally contacted via a transversely arranged auxiliary bridge (17). - 209884/1 1 S3