A copper-inserted cathode for aluminum electrolysis

Abstract

The utility model provides a copper-inserted cathode for aluminum electrolysis. The copper-inserted cathode for aluminum electrolysis includes a cathode carbon block, a paste is provided in the middle of one side surface of the cathode carbon block, and cathode steel rods are connected to both ends of the paste, and the cathode steel rod is located on one side of the cathode carbon block; the surface of the cathode steel rod close to the cathode carbon block and the surface away from the cathode carbon block are both provided with grooves, and a composite block is embedded in the groove, and the composite block includes a steel layer and a copper layer connected in sequence, and the copper layers of the two composite blocks on the same cathode carbon block are arranged away from each other. The utility model adopts a composite block with a copper layer to be embedded in the groove of the cathode steel rod. Copper has excellent conductivity and can further reduce the cathode voltage drop, so that the cathode voltage drop can be reduced to 150-160mv, thereby reducing energy consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum electrolysis smelting, in particular to a copper-inserted cathode for aluminum electrolysis. Background Art

[0002] The aluminum electrolytic cathode copper insert used in the production of electrolytic aluminum includes a cathode carbon block, two cathode steel bars arranged on one side of the cathode carbon block, and a paste filled in the gap between the two cathode steel bars. The connection between the cathode carbon block and the copper bar is very important for the cathode voltage drop. The existing cathode steel bars rely on the contact connection of the extrusion device. Due to the unstable contact resistance, the contact resistance between the cathode steel bar and the extrusion device increases during the later use, resulting in a rapid increase in the cathode voltage drop and increased energy consumption.

[0003] For example, the existing patent publication number CN107326398A discloses a cathode carbon block assembly and its preparation process, which adopts a method of symmetrically setting a plurality of grooves on the upper surface of the cathode carbon block on both sides of the paste, setting a dovetail groove at the bottom of the groove, and setting a steel rod in each groove. The root of the steel rod located on the outside of the cathode carbon block is coated with a silicon carbide slurry layer around it. Through this structural design, the cathode voltage drop can be reduced to 230-240mv, but there is still room for reduction. Utility Model Content

[0004] The utility model aims to provide an aluminum electrolysis cathode copper insert which can reduce cathode voltage drop and contact voltage drop to a greater extent and can reduce energy consumption.

[0005] The technical solution of the utility model is: a copper-inserted cathode for aluminum electrolysis, comprising a cathode carbon block, a paste is provided in the middle of one side of the cathode carbon block, both ends of the paste are connected to cathode steel rods, and the cathode steel rods are located on one side of the cathode carbon block; grooves are provided on the surface of the cathode steel rod close to the cathode carbon block and on the surface away from the cathode carbon block, a composite block is embedded in the groove, the composite block comprises a steel layer and a copper layer connected in sequence, and the copper layers of the two composite blocks on the same cathode carbon block are arranged away from each other.

[0006] In the above scheme, a composite block with a copper layer is embedded in the groove of the cathode steel rod. Copper has excellent conductivity and can further reduce the cathode voltage drop to 150-160mv, thereby reducing energy consumption.

[0007] Preferably, the groove is a dovetail groove that is larger at the top and smaller at the bottom, and the composite block is a trapezoid that matches the dovetail groove.

[0008] Preferably, the groove is a dovetail groove in the length direction of the cathode steel rod, and the groove passes through the cathode steel rod in the width direction of the cathode steel rod.

[0009] Preferably, the thickness of the copper layer is less than the thickness of the steel layer.

[0010] Preferably, the two grooves on the cathode steel rod are symmetrical.

[0011] Compared with the related art, the beneficial effects of the utility model are:

[0012] 1. The aluminum electrolysis cathode copper insert adopts a composite block with a copper layer embedded in the groove of the cathode steel rod. Copper has excellent conductivity and can further reduce the cathode voltage drop to 150-160mv, which is further reduced by 80mv in the existing technology.

[0013] 2. The groove of the cathode steel bar used to install the composite block is designed as a dovetail groove, which can make the composite block and the cathode steel bar fit tightly and be connected;

[0014] 3. The aluminum electrolysis cathode copper insert contacts the cathode steel rod through the composite block, which reduces the contact resistance between the cathode steel rod and the composite block to the greatest extent, thereby reducing contact energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic cross-sectional view of the copper-inserted cathode for aluminum electrolysis provided by the utility model;

[0016] Figure 2 A schematic diagram of the structure of the composite block.

[0017] In the attached drawings: 1, cathode carbon block; 2, cathode steel rod; 21, groove; 3, paste; 4, composite block; 41, steel layer; 42, copper layer. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0019] like Figure 1 As shown, the copper-inserted cathode for aluminum electrolysis provided in this embodiment includes a cathode carbon block 1, a cathode steel rod 2, a paste 3 and a composite block 4.

[0020] A paste 3 is provided in the middle of one side surface of the cathode carbon block 1. Both ends of the paste 3 are connected with cathode steel bars 2. The cathode steel bars 2 are located on one side of the cathode carbon block 1. The two cathode steel bars 2 are filled and connected by the paste 3.

[0021] The cathode steel rod 2 has grooves 21 on its surface close to the cathode carbon block 1 and on its surface away from the cathode carbon block 1. The grooves 21 are dovetail grooves in the length direction X of the cathode steel rod 2, which are dovetail grooves that are larger at the top and smaller at the bottom, that is, isosceles trapezoidal grooves. The two grooves 21 on the cathode steel rod 2 are symmetrical. The length of the grooves 21 is about 1200 mm. The grooves 21 pass through the cathode steel rod 2 in the width direction of the cathode steel rod 2. The width direction refers to the horizontal direction perpendicular to the length direction X. Figure 1 Not visible in.

[0022] The composite block 4 is embedded in the groove 21 by welding. Figure 2 As shown, the composite block 4 is a trapezoidal shape adapted to the dovetail groove. The composite block 4 includes a steel layer 41 and a copper layer 42 connected in sequence. The thickness of the copper layer 42 is less than that of the steel layer 41. Figure 1 The copper layers 42 of the two composite blocks 4 on the same cathode carbon block 1 are arranged away from each other. The steel layer 41 is connected to the working surface of the groove 21 of the cathode steel rod 2, and the copper layer 42 is connected to the working surface of the groove 21 of the cathode steel rod 2 by non-ferrous welding.

[0023] The conductor resistivity of copper is ≤0.01724mm 2 / M, the conductivity is second only to silver, and the composite block 4 with the copper layer 42 is used in contact with the cathode steel rod 2, which can effectively reduce the resistance and improve the conductivity of the cathode steel rod.

[0024] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A copper-inserted cathode for aluminum electrolysis, comprising a cathode carbon block (1), wherein a paste (3) is provided in the middle of one side of the cathode carbon block (1), characterized in that: Both ends of the paste (3) are connected to cathode steel rods (2), and the cathode steel rod (2) is located on one side of the cathode carbon block (1); the surface of the cathode steel rod (2) close to the cathode carbon block (1) and the surface away from the cathode carbon block (1) are both provided with grooves (21), and a composite block (4) is embedded in the groove (21), and the composite block (4) includes a steel layer (41) and a copper layer (42) connected in sequence, and the copper layers (42) of the two composite blocks (4) on the same cathode carbon block (1) are arranged away from each other.

2. The copper-inserted cathode for aluminum electrolysis according to claim 1, characterized in that: The groove (21) is a dovetail groove that is larger at the top and smaller at the bottom, and the composite block (4) is a trapezoid that matches the dovetail groove.

3. The copper-inserted cathode for aluminum electrolysis according to claim 2, characterized in that: The groove (21) is a dovetail groove in the length direction of the cathode steel rod (2), and the groove (21) passes through the cathode steel rod (2) in the width direction of the cathode steel rod (2).

4. The copper-inserted cathode for aluminum electrolysis according to claim 1, characterized in that: The thickness of the copper layer (42) is smaller than the thickness of the steel layer (41).

5. The copper-inserted cathode for aluminum electrolysis according to claim 1, characterized in that: The two grooves (21) on the cathode steel rod (2) are symmetrical.

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