Preparation method of low-resistance energy-saving double-anode steel claw

Abstract

The application relates to a preparation method of a low-resistance energy-saving double-anode steel claw, which takes an iron-carbon alloy as a raw material, is reinforced by a steel plate of Q235B material, and the impurity components of the iron-carbon alloy are controlled in the following ranges: C<=0.005%, Mn<=0.10%, Si<=0.01%, 0.003%<=P<=0.005%, and S<=0.007%. The application has the beneficial effect that the overall resistance of the steel claw is low, the mechanical property is enhanced by the structure, the overall strength and rigidity of the steel claw structure are guaranteed, and the mechanical property required by production is met.

Description

Technical Field

[0001] This invention relates to the field of anode steel claws, and more specifically to a method for preparing a low-resistance, energy-saving dual-anode steel claw. Background Technology

[0002] Currently, the anode steel claws of aluminum electrolytic cells in China are mainly made of ZG200-400 cast carbon steel. This cast carbon steel has good plasticity, toughness, and weldability, and its strength also meets the requirements for anodes. However, the alloy element content in the cast steel claws fluctuates greatly, especially the excessive content of impurity elements such as C, S, and P, which leads to increased resistance of the steel claws. In terms of manufacturing process, unreasonable casting processes can easily lead to defects such as shrinkage cavities, porosity, and inclusions inside the steel claws, reducing the effective conductive area and increasing resistance. The strength of cast steel claws is relatively low, and the deformation and damage rate of cast steel claws during the electrolytic aluminum production process is as high as 20%-35%, which greatly increases labor costs and workload for repair.

[0003] In recent years, some aluminum plants have begun using Q235 steel profiles welded into anode claws. This structural form eliminates, to some extent, the defects present in ordinary cast steel claws, such as slag inclusions, sand holes, and porosity. Furthermore, Q235 structural steel has a yield strength of 235 MPa and a tensile strength of 370 MPa-500 MPa, meeting the mechanical strength requirements of electrolytic cells. However, due to the high carbon content and resistivity of Q235 steel, its long-term energy-saving effect is still not optimal. Summary of the Invention

[0004] In summary, in order to overcome the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a low-resistance, energy-saving double-anode steel claw and its preparation method, which ensures its force requirements while reducing resistivity.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a low-resistance energy-saving double anode steel claw, which uses iron-carbon alloy as raw material and is reinforced with Q235B steel plate, and the impurity composition of the iron-carbon alloy is controlled within the following range: C≤0.005%, Mn≤0.10%, Si≤0.01%, 0.003%≤P≤0.005%, S≤0.007%.

[0006] The above-mentioned method for preparing low-resistance energy-saving dual-anode steel claws includes the following steps:

[0007] Step 1: Use iron-carbon alloy as raw material to melt and cast into plates and bars, and control the impurity composition of the iron-carbon alloy within the specified range;

[0008] Step 2: After bending the sheet material obtained in Step 1, two first blanks and two second blanks are obtained. At the same time, after cutting the bar material obtained in Step 1, several cylindrical claws are obtained. The first blanks and the second blanks are U-shaped and correspond one-to-one, and the inner sidewall of the first blank can fit onto the outer sidewall of the second blank.

[0009] Step 3: Weld the outer side wall of the first blank to the inner side wall of the corresponding second blank to obtain two U-shaped third blanks, and weld the two third blanks back to back with their openings facing different directions to obtain a fourth blank; Weld reinforcing plates to the two outer side walls of the fourth blank respectively, and form a cavity between the middle of the reinforcing plate and the middle position of the side of the fourth blank.

[0010] Step four: The cylindrical claws obtained in step two are evenly welded to the bottom of both sides of the fourth blank, and reinforcing blocks are welded to the top and bottom of the cavity to obtain the finished product. Finally, the finished product is shot blasted.

[0011] Furthermore, the impurity composition of the iron-carbon alloy described in step one is controlled within the following ranges: C≤0.005%, Mn≤0.10%, Si≤0.01%, 0.003%≤P≤0.005%, S≤0.007%.

[0012] Furthermore, the reinforcing plate in step three and the reinforcing block in step four are both made of Q235B steel plates.

[0013] Furthermore, the cylindrical claw head described in step four is welded to the bottom of both sides of the fourth blank using a full-section welding process.

[0014] The beneficial effects of this invention are: while ensuring a low overall resistance of the steel claw, it also employs a structure that enhances mechanical properties, ensuring that the overall steel claw structure has sufficient strength and rigidity to meet the mechanical properties required for production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the first blank;

[0016] Figure 2 This is a schematic diagram of the structure of the second blank;

[0017] Figure 3 This is a schematic diagram of the structure of the third blank;

[0018] Figure 4 This is a structural schematic diagram of the fourth blank;

[0019] Figure 5 This is a schematic diagram of the finished product.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. First blank, 2. Second blank, 3. Cylindrical claw head, 4. Third blank, 5. Fourth blank, 6. Reinforcing plate, 7. Cavity, 8. Reinforcing block, 9. Finished product. Detailed Implementation

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0023] A method for preparing a low-resistance, energy-saving dual-anode steel claw includes the following steps:

[0024] Step 1: Use iron-carbon alloy as raw material to melt and cast into plates and bars, and control the impurity composition in the iron-carbon alloy within the following specified range: C≤0.005%, Mn≤0.10%, Si≤0.01%, 0.003%≤P≤0.005%, S≤0.007%.

[0025] Step two, as Figure 1 and 2 As shown, the sheet material obtained in step two is bent to obtain two first blanks 1 and two second blanks 2. At the same time, the bar material is cut to obtain several cylindrical claw heads 3. The first blanks 1 and the second blanks 2 are U-shaped and correspond one-to-one, and the inner sidewall of the first blank 1 can fit onto the outer sidewall of the second blank 2.

[0026] Step 3, as Figure 3 and 4 As shown, the outer sidewall of the first blank 1 is welded to the inner sidewall of the corresponding second blank 2 to obtain two U-shaped third blanks 4, and the two third blanks 4 are welded back-to-back with their openings facing different directions to obtain a fourth blank 5. Reinforcing plates 6 are welded to the two outer sidewalls of the fourth blank 5, and a cavity 7 is formed between the middle of the reinforcing plate 6 and the middle position of the side of the fourth blank 5. Preferably, the reinforcing plate 6 is a Q235B steel plate, and the cylindrical claw head 3 is welded to the bottom of both sides of the fourth blank 5 using a full-section welding process.

[0027] Step four, as Figure 5 As shown, the cylindrical claw head 3 obtained in step three is divided into two equal parts, and the two equal parts of the cylindrical claw head 3 are evenly welded to the bottom of both sides of the fourth blank 5 using corresponding tooling. Then, reinforcing blocks 8 are welded to the top and bottom of the cavity 7 to obtain the finished product 9. Finally, the finished product 9 is shot blasted. Preferably, the reinforcing block 8 is a Q235B steel plate.

[0028] The low-resistance, energy-saving dual-anode steel claws prepared according to the above-described process of this invention have been used in electrolytic cell #118 since its commissioning. All production indicators of the electrolytic cell have remained stable, with no reddening or detachment of the steel claws. The steel claws exhibit good conductivity and show no cracking or breakage. Compared with the control cell #119, the voltage drop across the steel claws has been reduced by more than 15mV, achieving excellent experimental results. The following are detailed descriptions of the experimental and control cells.

[0029] Test results: Comparison with trough #119

[0030] Test tank: 118# tank; Structure: low resistance energy-saving double anode steel claw;

[0031] Comparison slot: 119# slot; Structure: traditional cast steel claw.

[0032] To test and verify the effectiveness of the low-resistance energy-saving dual-anode steel claw, the test data of the 118# slot, which uses the low-resistance energy-saving dual-anode steel claw, and the existing steel claw in the adjacent 119# slot, which uses a traditional cast steel claw, were compared, as shown in Tables 1 to 7. (Note: Measurement point 1 is the pressure drop from directly above the steel beam to the distance from the first steel claw in the middle; measurement point 2 is the pressure drop from directly above the steel beam to the distance from the second steel claw in the middle.)

[0033] (1) Comparison data of the two tanks 20 days after installation:

[0034] Table 1. Test results of the test tank 20 days after loading.

[0035]

[0036] Table 2 Comparison of tank test results 20 days after tank loading

[0037]

[0038] (2) Comparison data of the two tanks 40 days after installation:

[0039] Table 3 Test results of the test tank 40 days after loading.

[0040]

[0041] Table 4. Comparison tank test results after 40 days in the tank.

[0042]

[0043] (3) Comparison data of the two tanks 60 days after installation:

[0044] Table 5 Test results of the test tank after 60 days.

[0045]

[0046] Table 6. Comparison tank test results after 60 days in the tank.

[0047]

[0048] Table 7 Summary of Average Pressure Drop of Steel Claws in Test and Control Tanks

[0049]

[0050] As can be seen from Table 7, based on the test data after 20 days, 40 days, and 60 days, the average voltage drop of the low-resistance energy-saving dual-anode steel claw differs from that of the existing steel claw by 15.76mV, showing a significant effect.

[0051] Based on the production data of the two cells over two months, it can be seen that, under the same conditions of production operation, electrolytic cell design, and raw materials, the production data of the 118# test cell, which uses low-resistance energy-saving double anode steel claws, is significantly better than that of the 119# control cell. The low-resistance energy-saving double anode steel claws have a significant advantage in energy saving and consumption reduction.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for producing a low-resistance energy-saving double-anode steel claw, characterized by, With iron-carbon alloy as raw material, and with the Q235B material steel plate to strengthen, and the impurity composition of the iron-carbon alloy is controlled in the following range: C≤0.005%, Mn≤0.10%, Si≤0.01%, 0.003%≤P≤0.005%, S≤0.007%, including the following steps: Step one, with iron-carbon alloy as raw material, and with the Q235B material steel plate to strengthen, and the impurity composition of the iron-carbon alloy is controlled in the following range: C≤0.005%, Mn≤0.10%, Si≤0.01%, 0.003%≤P≤0.005%, S≤0.007%, including the following steps: Step two, the plate material obtained in step one is cut and bent to obtain two first blanks (1) and two second blanks (2), and the rod material obtained in step one is cut to obtain a plurality of cylindrical claw heads (3); the first blank (1) and the second blank (2) are in one-to-one correspondence and are in U-shaped form, and the inner side wall of the first blank (1) can be attached to the outer side wall of the second blank (2); Step three, the outer side wall of the first blank (1) and the inner side wall of the corresponding second blank (2) are welded to obtain two third blanks (4) in U-shaped form, and the two third blanks (4) are welded back to back with their openings facing different directions to obtain a fourth blank (5); a reinforcing plate (6) is welded on each of the two outer side walls of the fourth blank (5), and a cavity (7) is formed in the middle of the reinforcing plate (6) and the side of the fourth blank (5); Step four, the cylindrical claw heads (3) obtained in step two are evenly welded on the two side bottoms of the fourth blank (5), and reinforcing blocks (8) are welded on the top and bottom of the cavity (7) to obtain a finished product (9), and finally the finished product (9) is shot blasted.

2. A method of producing a low resistance energy saving double anode steel claw according to claim 1, characterized in that, The impurity composition of the iron-carbon alloy in step one is controlled in the following range: C≤0.005%, Mn≤0.10%, Si≤0.01%, 0.003%≤P≤0.005%, S≤0.007%.

3. A method of producing a low resistance energy saving double anode steel claw according to claim 2, characterized in that, The reinforcing plate (6) in step three and the reinforcing block (8) in step four are both Q235B material steel plates.

4. The method of producing a low resistance energy-saving double anode steel claw according to claim 3, characterized by, The cylindrical claw heads (3) in step four are welded on the two side bottoms of the fourth blank (5) by full-section welding process.

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