FI58164C - ELEKTROLYSCELL OCH SAETT ATT FRAMSTAELLA DENSAMMA - Google Patents

Description

P55F71 M (11) MONTH, LUTUS PUBLICATION CQ164 ffiTjB LJ '' UTLÄGGNI NGSSKRIFT 0 0 1 0 ** 3¾¾ C Patent ey2r.no tty 10 12 1920 ^ 'Patent meddelat ^ (51) iwfcW3 C 25 B 9 / CW-, C 25 C 7/02 ENGLISH - Fl N LAN D Φ) - 792639 (22) HtkwniipDvl —AmSknlngadai 23.08.79 (23) AlkupUvi — GlMghrtsdig 06.06.78 (41) Tullut JulklMlui - Bllvlt offmtllf 07.12.79

Patent and Register Administration Nihtmidp ™ kuLJikik * un pvm. -

Patent och ragistarstyralaan '' AmMum utiagd och uti. * KrMtm pubiicund 29.08.80 ~ (32) (33) (31) Pjryd * «ey etuolkeu * —Bejird prlofitet (71) Finnish Chemicals OY, Keikyä, 327 ^ 0 Äetsä, Finland -Finland (FI) (72) Osmo Johannes Kuusinen, Äetsä, Väinö Olavi Rintanen, Äetsä, Finland-Finland (FI) (7 ^) Berggren Oy Ab (5 ^) Electrolysis cell and method of its manufacture - Elektrolyscell och sätt att framställa densamma ( This invention relates to an electrolytic cell, in particular for the electrolytic production of metals, and to a process for the production of an electrolytic cell according to the invention, in particular to a method of attaching suspension conductors to titanium electrodes.

Today, titanium electrodes are used in the manufacture of metals.

It is known from DOS-2550178 to hang a titanium electrode on a copper or aluminum hanging conductor having a titanium core metallurgically bonded to the copper or aluminum, whereby the copper or aluminum sheath of the hanging conductor is at least partially removed to expose the titanium core to the titanium core. . However, the manufacture of such a suspension conductor is relatively cumbersome and expensive.

2,581 64

According to the above-mentioned publication, it is also possible to use a titanium-coated copper rail in which the copper is metallurgically bonded to titanium, whereby the titanium electrode can be fixed to the titanium sheath of the suspension conductor by spot welding. Again, the titanium electrode is not attached directly to the copper suspension conductor, but the suspension conductor is first coated with titanium metallurgically bonded to the copper.

It is therefore an even simpler object of the present invention to provide an electrolytic cell in which the current path between the suspension conductors connected to the other pole of the current source and their electrodes is as short as possible and the overcurrent resistance is as low as possible. According to the present invention, such an electrolytic cell is obtained by gas arc welding and in particular by MIG or TIG welding of suspended conductors directly to titanium electrodes. The suspension conductors are preferably aluminum, but copper conductors can also be used if the welding is carried out using an aluminum additive.

In the electrolytic cell according to the invention, transient resistances are avoided and a short titanium current path is obtained.

According to the present invention, the aluminum suspension conductor is welded directly to the titanium electrode by MIG or TIG welding. In tensile tests on a welded test bar, the strength of the weld has been found to be equal to or nearly equal to that of aluminum. In the resistance measurements, the transition resistance of the weld seam has been found to be zero with the total resistance being the sum of the resistances of the Ti and Al bars. Thus, it can be stated that gas arc welding provides a contact surface between titanium and aluminum with zero transition resistance. When aluminum suspension conductors and titanium electrodes are welded according to the invention, a large contact surface between aluminum and titanium is obtained.

The invention will be described in more detail below with reference to the accompanying drawings, in which Figure 3 581 64 shows a cross-sectional end view of a cell according to the invention for the electrolytic production of metals and Figure 2 is a section along the line A-A in Figure 1.

Figure 1 shows a preferred embodiment of the invention for metal electrolysis, in which the electrodes 3 are suspended on hanging conductors 2, so that the electrodes 3 hang in the electrolysis pool 1. As can be seen in more detail in Figure 2, the upper end 6 of each electrode 3 is arranged in the longitudinal conductor 2. into a gap extending vertically through the suspension conductor 2. The electro di 3 is titanium and the suspension conductor 2 is either copper or aluminum.

The gap is further upwardly expanding and the upper end of the electrode 3 is welded to the suspension conductor 2 at this expanded portion, so that the weld seam 4 is pressed tightly between the sloping walls 5 of the gap.

With this solution, the electrode 3 is very tightly attached to the suspension conductor 2 when the upper end 6 of the electrode 3 wedges into the gap.

According to the present invention, the electrode 3 can be welded to the suspension conductor 2 by a connection method other than that described in the example, e.g. by welding the electrode arm to the side of the suspension conductor or by welding the suspension conductor under a bent electrode arm.

In order to achieve a contact surface with zero transition resistance, it is also possible to weld the aluminum layer to the titanium electrode by MIG or TIG welding and attach the suspension conductors in normal ways, e.g. by welding or screw connection (the transition resistance between Al / Al is small) .

Claims (5)

An electrolytic cell having a vessel (1) for an electrolyte, a plurality of plate-like electrodes (3) arranged in the vessel (1) and means for connecting the electrodes to an electric power source, the members being aluminum or alternatively copper hanging conductors (2) attached to titanium electrodes when welding with aluminum additive (3), characterized in that the titanium electrodes (3) are gas arc welded to the suspension conductors (2) or are correspondingly over-welded with aluminum before being attached to the suspension conductors (2). Electrolysis cell according to Claim 1, characterized in that the suspension conductors (2) are attached to the titanium electrodes (3) by MIG or TIG welding. Electrolysis cell according to Claim 1 or 2, characterized in that the suspension conductor (2) has at least one longitudinal vertical slot passing through the suspension rod, in which the upper edge (6) of the titanium electrode (3) is fastened to the suspension rod (2). Electrolytic cell according to Claim 3, characterized in that the gap or slots in the suspension rod (2) are upwardly expanding, so that the upper edge (6) of the titanium electrode (3) with welds (4) wedges the sloping surfaces of the upwardly expanding gap or slots. (5) against. 4,581 64 A method of manufacturing an electrolytic cell according to claim 1 by fitting a plurality of plate-like electrodes (3) side by side in an electrolyte vessel (1) and connecting the electrodes (3) to an electric power source by aluminum or copper overhead lines (2). 2) directly but using an aluminum additive at least when the suspension conductor (2) is made of copper. Method according to Claim 5, characterized in that the gas arc welding is carried out as MIG or TIG welding, while the copper suspension conductors (2) are connected as MIG or TIG welding with an aluminum additive.