Cathode for copper receiving

FIELD: metallurgy, electrolysis.

SUBSTANCE: invention concerns cathode for copper receiving. Particularly it concerns hydrometallurgical receiving of starter cathodes of copper by means of electrolysis on the basis of unsupported technology. Cathode for copper receiving contains plane matrix basis made of titanium, to which by means of welding it is rigidly attached current contact jaw, containing of assembly titanium basis. On side walls of the basis there are applied plating layers of copper. Current contact jaw is implemented of trimetal copper- titanium -copper by means of explosion welding.

EFFECT: improving of electrotechnical characteristics of cathodes, reduction of its steel intensity and durability increasing which provides receiving of starter cathodes with stable characteristics, increasing of its quality, reduction of electric loss.

2 dwg

 

The invention relates to the hydrometallurgical getting starter cathodes of copper by electrolysis on unsupported technologies. The invention can be used to provide pots.

Starter (primary) cathodes are thin (0.4-0.7mm) sheets of electrolytic copper cathode base. They are gathered by electrolytic on the matrices of cold-rolled copper or titanium. Quality starter cathode obtained by deposition on copper sulfatirovanne matrix has significant shortcomings that leads to the production of copper cathode with high content of impurities. Namely, due to the strong adhesion of copper to the surface of the matrix of the copper sheet it is necessary to apply a lubricant, allowing subsequently to separate the cathode from the matrix sheet. Grease getting on starter cathodes, pollutes cathodic sediment (ready sheets of refined copper used in the future for the production of eletrotekhnicheskikh products).

These shortcomings successfully removed, if you apply the cathodes (matrix) matrix sheets of titanium. In this case, due to the low adhesion of copper to titanium matrix sheet, a release agent is not required. The use of titanium cathodes (matrices) also allows us to improve such characteristics starter cathode, as fine grain,elasticity, consequently, the quality of the subsequent deposition of copper. However, the application of titanium matrix sheets associated with a number of problems, namely to obtain starter cathodes uniform thickness it is necessary to ensure a uniform current density across the surface of the matrix sheet. And to reduce energy losses and reduce heating of the cathodes (matrices) in the process of operation should be possible to reduce the size of the transition of the electrical resistance between the current-carrying bus electrolysis cell and matrix (V.A. Kozlov and other Refining of copper. M, Metallurgy, 1992).

Known cathode for the electrolytic deposition of copper, consisting of a rod, made of two titanomachy (bi-metal) plates that are rigidly by welding overlapping attached to the matrix sheet (Patent RF №2094533, IPC SS 7/02, publ. 1997.10.27) prototype.

During operation rod for its copper contacts in contact with the contacts ecopedagogy tubs, copper contacts of the matrix to reduce contact resistance and stabilize it, then the electric current passes sequentially through the contact surface of the copper - titanium, made by explosion welding (contact resistance is almost equal to zero), the contact surface of the titanium - titanium, weld titanium - titanium, by which current is supplied to the full who offered basis.

During the electrolysis of copper from the electrolyte solution is deposited on the side surfaces of the matrix. As the end of the electrolysis cathodes are removed from the bath and are zdyrko layers with matrix by mechanical means, such as a wedge.

The disadvantage of this design is that the design meets at least three parts, made of expensive material is thin (2-5 mm) titanium sheet, and has a boundary titanium-titanium with high contact resistance, the value of which depends on the flatness of parts (bimetallic plates and matrix sheet) and may vary over time due to heating of the cathode (the matrix) and warping. In addition, the welded lap joint, transition electrical resistance which is unstable due to the small cross-section and has a large variation, leads to uneven current load on the working surfaces of the matrix leaves not only from sample to sample, but also in time. This causes a noticeable change in the speed ratio of electrocrystallization and mass transfer at different cathodes (matrices) electrolysis cell, which leads to significant deviations of thicknesses starter cathodes in the same tank, the energy losses and reduced, due to overheating, the lifetime of the cathodes (m is tric).

The purpose of the invention is the obtaining of starter cathodes with stable characteristics, improved quality, reduced energy losses, as well as reducing the cost and improving the manufacturability of the cathodes.

The technical result of the present invention is to improve electrical properties of the cathode, the reduction of metal consumption and increased durability.

The technical result is achieved by the fact that in the cathode to produce copper on unsupported technologies, flat matrix containing the basis of titanium, which by welding rigidly attached to a current supply, consisting of prefabricated titanium base, the sides of which is coated with a cladding layers copper current lead is made of trimetal copper-titanium-copper method of explosion welding.

The invention is illustrated in the drawings, in which figure 1 shows the proposed cathode figure 2 - cross section A-A.

The cathode includes a current supply 1, consisting of a titanium base 2, to which the side-by-side method of explosion welding attached copper plate 3, to the titanium base 2 is welded matrix base 4.

In operation the cathode is installed on pins electrolysis cell. After the supply voltage electric current passes successively through the contact surface of the electrolysis bath is copper p is required, the contact surface of the copper - titanium base 2, the weld titanium - titanium.

Using tripetala allows you to combine the most valuable properties of the individual metals. In this particular case, increased strength, high resistance to aggressive environments and low adhesion of titanium alloys to copper with high and stable electrical conductivity of copper. Using explosive technology provides a firm connection of the metals at the molecular level, the contact resistance of 0.001 Ω to 0,000007 Ohms. Received tri-metal composition can be subjected to various methods of processing: cutting, rolling, bending, welding, etc. Butt weld connection matrix with a titanium-based electrical power supply has a cross section equal to the thickness of the matrix, and the electrical resistance as the main sheet.

When operation of the prototype, it was noted that, compared with existing cathodes on matrix baths the current output has increased from 75% to 95%, the thickness of the sheet of copper is uniform across the working area of the cathode matrix, the current distribution is uniform, the current leads are not overheat, contact trimetal good.

The proposed design eliminates mechanical destruction of the cathode in the contact zone of copper - titanium when dismantling and during operation, it increases the durability, reduces the loss of electrical energy in comparison with currently used cathodes, reduces the metal structure, ensures the stability of the current load on the cathode matrix.

The cathode to produce copper, flat matrix containing the basis of titanium, which by welding rigidly attached to a current supply, consisting of prefabricated titanium base, the sides of which is coated with a cladding layers of copper, characterized in that the current lead is made of trimetal copper-titanium-copper method of explosion welding.



 

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