Method of cathode manufacturing for copper electrowinning

FIELD: electricity.

SUBSTANCE: method includes welding of current lead in the form of copper-coated plates to matrix basis. At that copper coating is made by electrolytic deposition at lead plates pre-treated for the purpose of increase of their surface roughness.

EFFECT: improvement of cathode electrical properties, reduction in metal consumption and increase of service life.

 

The invention relates to the hydrometallurgical use of the cathodes obtained by electrolysis.

The cathodes are harvested by electrolytic on the matrix basics of cold-rolled copper or titanium. The quality of the 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 copper matrix of the basics you need to apply a lubricant, allowing subsequently to separate the cathodic basis matrix from the basis. Grease getting on the 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 based release agent is not required. The use of titanium matrix basics also allows us to improve the characteristics of the cathode, as fine grain, elasticity, and hence the quality of the subsequent deposition of copper. However, the application of titanium matrix basics connected with a number of problems, namely to obtain cathodes uniform thickness must ensure the the same current density across the surface of the matrix. And to reduce energy losses and reduce heating of the matrix 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).

The closest analogue for the intended purpose and essential features is the patent RU 2346087 (SS 7/02, publ. 10.02.2009,) in which is disclosed a method of manufacturing a cathode for the electrolytic production of copper, including the welding of electrical power supply, made in the form of plates with a copper coating, a matrix basis.

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) and may vary in time in connection with the heating 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 surface the x matrix of the foundations not only from sample to sample, but also in time. This causes a noticeable change in the speed ratio of electrocrystallization and mass transfer for different matrix basics of electrolysis cells, which leads to significant deviations of the thickness of the cathodes in the same tank, the energy losses and reduced, due to overheating, life matrix basics. As a disadvantage of this design is the separation of the copper layer of the current leads from the titanium substrate and nerabotosposobnosti. To restore the matrix it is necessary to cut the defective feeding and weld on the new current lead, which leads to the warping of the fabric in the zone of welding due to the appearance of stresses in the welds, the length of which the current supply is more than 4000 mm

The claimed method differs from the prototype in that the copper coating is precipitated by electrolysis on a previously prepared to increase the roughness of the surface of the wafer electrical power supply.

The purpose of the invention is the obtaining of cathodes with stable performance, reduced power losses and cost with the possibility of repair.

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 in that in the method from which otopleniya cathode for the electrolytic production of copper, including the welding of electrical power supply, made in the form of plates with a copper coating to the matrix basis, the copper coating is precipitated by electrolysis on a previously prepared to increase the roughness of the surface of the wafer electrical power supply.

The manufacturing process of the contact matrix of bases consists of several operations. The canvas matrix weld the two plates of a thickness of 4 mm and a length of the weld is only 40 mm, in order To gain strength tokodede on both sides for the entire length of the spot welded welded strip width 20 cm, With the aim of increasing the roughness of the contact is treated with sandpaper and put a notch. These operations contribute monolithic adhesion of the deposited layer with a titanium substrate, the maximum conductivity of the electrical power supply.

The process of manufacturing electrical power supply flows in the cell, which is made of vinyl chloride in the form of boxes, divided by partitions into 6 sections. In each cell of the reception chamber is a solution. Matrix in cells mounted on a special insulating stand with immersion in the electrolyte to a depth of 40-45 mm septum is placed a copper plate and is connected to the anode bus. Installation is connected to a rectifier unit with the possibility of reversing the current.

The manufacturing process Toko is odvod proceeds under the following technological parameters.

The composition of the electrolyte, g/l:

CH2SO4ClNiAsSb
42-55145-1650,0035-8-123-50,3-0,5

The temperature of the electrolyte - (55-62)C.

The circulation rate - (30-45) l/min

The current density - (6-12) A/DM2.

Matrix with a pre-prepared surface (dressing, editing, processing soda solution, etching) and welded on the basis of the electrical power supply of reinforcing plates by the method of spot welding loaded into a bath of soluble copper anodes. Within 6-7 days is increasing copper coatings on feeding.

The table below shows comparative data for the baths, loaded cathodes, fabricated by the proposed method and the prototype.

No. of experiments1234the placeholder
0,3090,3050,2730,3010,320

Using the proposed method of manufacturing a cathode for the electrolytic production has the following advantages:

- power saving;

- the cost of making 3 times lower than that of the prototype;

- the use of a soluble copper anode for receiving the electrical power supply of high-quality, dense cathode deposits and reduced gas release into the air of the working zone;

- the possibility of repair of the cathode by dissolving copper coating on the electrical power supply.

A method of manufacturing a cathode for the electrolytic production of copper, including the welding of electrical power supply, made in the form of plates with a copper coating, a matrix basis, characterized in that the copper coating is precipitated by electrolysis on a previously prepared to increase the roughness of the surface of the wafer electrical power supply.



 

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