Eutectic phosphorus pig iron and application thereof

Abstract

The invention provides eutectic phosphorus pig iron. The eutectic phosphorus pig iron is prepared from 2.0 wt% to 3.8 wt% of C, 2.0 wt% to 3.0 wt% of Si, 0.5 wt% to 0.7 wt% of Mn, 0.6 wt% to 1.5 wt% of P, 0 wt% to 0.11 wt% of S and 91.5 wt% to 95.4 wt% of Fe. The invention further provides an aluminum electrolysis cell anode carbon block set which comprises the steel claw, the eutectic phosphorus pig iron and the carbon block, and the steel claw and the carbon block are connected through the eutectic phosphorus pig iron; the eutectic phosphorus pig iron is the eutectic phosphorus pig iron disclosed by the scheme. According to the eutectic phosphorus pig iron provided by the invention, the connection strength and the conductivity of the aluminum electrolysis anode can be optimized, and the iron-carbon pressure drop is reduced, so that the stability and the reliability of an anode assembly comprising the eutectic phosphorus pig iron in use are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of ferrophosphorus, and particularly to a eutectic ferrophosphorus and its application. Background Art

[0002] The application of ferrophosphorus in aluminum electrolysis production has important technical background and practical significance. The anode assembly in the aluminum electrolysis process consists of three parts: carbon block, steel claw and aluminum busbar. As a key material connecting the steel claw and the carbon anode, ferrophosphorus not only affects the connection strength and resistance of the anode assembly, but also plays a decisive role in the iron-carbon voltage drop and current efficiency during the operation of the electrolytic cell. The composition of traditional ferrophosphorus is characterized by a high phosphorus content. Phosphorus helps to improve the fluidity of molten iron and weaken the iron shrinkage effect, but it also brings problems such as electrolyte pollution, decreased current efficiency and increased brittleness at high temperatures during the production process.

[0003] The research on eutectic ferrophosphorus is based on the characteristics of phosphide eutectic, aiming to improve the fluidity and casting properties of ferrophosphorus by adjusting the composition. The low melting point of phosphide eutectic helps to improve the fluidity and castability of cast iron, but too much phosphide eutectic will cause defects such as shrinkage cavities, shrinkage porosity and cracking in cast iron, and at the same time increase brittleness, making the cast iron more prone to fracture; the relatively high hardness of eutectic ferrophosphorus improves the strength of the material to a certain extent, but its brittleness and the effect of splitting grains may lead to a decrease in the plasticity of ferrophosphorus; in addition, phosphide eutectic also makes it easier for the anode and the steel claw to separate, but it also increases the iron-carbon voltage drop of the anode, which may cause rapid depolarization of the anode carbon and affect the stability of the electrolysis process. The above problems need to be optimized by precisely controlling the content of elements such as carbon, sulfur, manganese, phosphorus and silicon. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a eutectic ferrophosphorus. The eutectic ferrophosphorus provided by the present application has good conductivity, volume shrinkage rate, viscosity and tensile strength, and finally enables the eutectic ferrophosphorus to have excellent voltage drop reduction, ensuring the stability of the eutectic ferrophosphorus in aluminum electrolysis applications.

[0005] In view of this, the present application provides a eutectic ferrophosphorus, calculated by mass percentage, including: C 2.0 - 3.8%, Si 2.0 - 3.0%, Mn 0.5 - 0.7%, P 0.6 - 1.5%, S 0 - 0.11%, Fe 91.5 - 95.4%.

[0006] In some specific embodiments, the content of C is 3.6 - 3.8%, and / or the content of Si is 2.54 - 2.98%.

[0007] In some specific embodiments, the content of Mn is 0.62 - 0.68%.

[0008] In some specific embodiments, the content of P is 0.62 - 0.75%.

[0009] In some specific embodiments, the content of S is 0.06 - 0.11%.

[0010] In some specific embodiments, the content of C is 3.75%, the content of Si is 2.54%, the content of Mn is 0.675%, the content of P is 0.625%, the content of S is 0.105%, and the balance is Fe.

[0011] In some specific embodiments, the method for preparing the eutectic ferrophosphorus includes the following steps:

[0012] Weigh the ingredients according to the component ratio of the eutectic ferrophosphorus, mix them and then carry out smelting;

[0013] Pour the molten iron after smelting for casting, and it will form after cooling.

[0014] In some specific embodiments, the raw materials for weighing the ingredients include foundry iron, ferrophosphorus, ferrosilicon and ferromanganese; and / or, the tapping temperature of the molten iron after smelting is 1400 - 1500 °C.

[0015] This application also provides an anode carbon block group for an aluminum electrolysis cell, which includes steel claws, eutectic ferrophosphorus and carbon blocks, and the steel claws and the carbon blocks are connected by the eutectic ferrophosphorus;

[0016] The eutectic ferrophosphorus is the eutectic ferrophosphorus described in the above solution.

[0017] In some specific embodiments, the method for preparing the anode carbon block group for an aluminum electrolysis cell includes the following steps:

[0018] Weigh the ingredients according to the component ratio of the eutectic ferrophosphorus, mix them and then carry out smelting;

[0019] Pour the molten iron after smelting into a tundish, and use the tundish to inject the molten iron into the carbon bowl for bonding between the steel claws and the carbon blocks. After the molten iron cools, the anode carbon block group for an aluminum electrolysis cell is obtained.

[0020] This application provides a eutectic ferrophosphorus, which includes: 2.0 - 3.8 wt% of C, 2.0 - 3.0 wt% of Si, 0.5 - 0.7 wt% of Mn, 0.6 - 1.5 wt% of P, 0 - 0.11 wt% of S, and 91.5 - 95.4 wt% of Fe. The eutectic ferrophosphorus provided by this application adjusts the ratio of the silicon content and the phosphorus content, and optimizes other chemical components, so that while reducing the content of phosphide eutectic, the voltage drop of the aluminum electrolysis anode is improved, the voltage loss in the electrolysis production is reduced, and the aluminum electrolysis process is more stable. Description of the Drawings

[0021] Figure 1 It is a graph showing the periodic change of the iron-carbon voltage drop of phosphor iron produced by three enterprises in the prior art of the present invention during aluminum electrolysis application;

[0022] Figure 2 It is a graph showing the periodic change of the iron-carbon voltage drop of phosphor iron prepared in Example Group 1 and Comparative Example Group 1 of the present invention during aluminum electrolysis application. Specific embodiments

[0023] To further understand the present invention, the preferred embodiments of the present invention will be described below in conjunction with examples. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0024] Phosphide eutectic is a eutectic product containing phosphorus formed during the solidification of phosphor iron, usually existing in the forms of binary phosphide eutectic (γ-Fe+Fe3P), ternary phosphide eutectic (γ-Fe+Fe3C+Fe3P) and composite phosphide eutectic; phosphide eutectic has relatively high hardness and brittleness, usually distributed at the grain boundaries, cutting off the continuity between grains, thereby reducing the strength and plasticity of phosphor iron. The low melting point of phosphide eutectic helps to improve the fluidity and castability of cast iron, but excessive phosphide eutectic will cause defects such as shrinkage cavities, shrinkage porosity and cracking in cast iron, and at the same time increase brittleness, making cast iron more prone to fracture; in addition, phosphide eutectic makes it easier for the anode to separate from the steel claw, but also increases the iron-carbon voltage drop of the anode, which may lead to rapid depolarization of the anode carbon and affect the stability of the electrolysis process. Therefore, controlling the content of phosphide eutectic is the key to ensuring the stable performance of phosphor iron and improving the quality of castings. In view of the above problems, the present application provides a eutectic phosphor iron, which, by adjusting and optimizing the content of each element, makes the obtained eutectic phosphor iron have good conductivity, volume shrinkage rate, viscosity and tensile strength, and finally makes the eutectic phosphor iron have excellent voltage drop reduction, ensuring the stability and reliability of the anode assembly during use. Specifically, the embodiments of the present invention disclose a eutectic phosphor iron, by mass percentage, including: C 2.0-3.8%, Si 2.0-3.0%, Mn 0.5-0.7%, P 0.6-1.5%, S 0-0.11%, Fe 91.5-95.4%.

[0025] In the eutectic phosphorus pig iron provided by the present application, the content of C is 2.0 - 3.8 wt%, specifically, the content of C is 3.6 - 3.8 wt%, and more specifically, the content of C is 3.63 - 3.75 wt%; in the present application, the content of C is 2.01 wt%, 2.04 wt%, 2.05 wt%, 2.07 wt%, 2.08 wt%, 2.09 wt%, 2.10 wt%, 2.11 wt%, 2.14 wt%, 2.16 wt%, 2.17 wt%, 2.18 wt%, 2.20 wt%, 2.21 wt%, 2.23 wt%, 2.25 wt%, 2.26 wt%, 2.27 wt%, 2.29 wt%, 2.30 wt%, 2.31 wt%, 2.35 wt%, 2.37 wt%, 2.39 wt%, 2.40 wt%, 2.41 wt%, 2.42 wt%, 2.43 wt%, 2.44 wt%, 2.46 wt%, 2.47 wt%, 2.49 wt%, 2.50 wt%, 2.51 wt%, 2.53 wt%, 2.55 wt%, 2.56 wt%, 2.57 wt%, 2.59 wt%, 2.60 wt%, 2.65 wt%, 2.66 wt%, 2.69 wt%, 2.70 wt%, 2.71 wt%, 2.73 wt%, 2.74 wt%, 2.76 wt%, 2.77 wt%, 2.79 wt%, 2.80 wt%, 2.82 wt%, 2.84 wt%, 2.86 wt%, 2.87 wt%, 2.89 wt%, 2.90 wt%, 2.91 wt%, 2.92 wt%, 2.94 wt%, 2.95 wt%, 2.96 wt%, 2.98 wt%, 3.00 wt%, 3.1 wt%, 3.2 wt%, 3.3 wt%, 3.4 wt%, 3.5 wt%, 3.58 wt%, 3.59 wt%, 3.60 wt%, 3.61 wt%, 3.62 wt%, 3.63 wt%, 3.64 wt%, 3.65 wt%, 3.66 wt%, 3.67 wt%, 3.68 wt%, 3.69 wt%, 3.70 wt%, 3.71 wt%, 3.72 wt%, 3.73 wt%, 3.74 wt%, 3.75 wt%, 3.76 wt%, 3.77 wt%, 3.78 wt%.

[0026] The content of Si is 2.0 - 3.0 wt%, specifically, the content of Si is 2.50 - 2.99 wt%, more specifically, the content of Si is 2.54 - 2.98 wt%; in the present application, the content of Si is 2.51 wt%, 2.52 wt%, 2.53 wt%, 2.56 wt%, 2.57 wt%, 2.58 wt%, 2.59 wt%, 2.60 wt%, 2.61 wt%, 2.62 wt%, 2.63 wt%, 2.64 wt%, 2.65 wt%, 2.66 wt%, 2.67 wt%, 2.68 wt%, 2.69 wt%, 2.70 wt%, 2.71 wt%, 2.72 wt%, 2.73 wt%, 2.74 wt%, 2.75 wt%, 2.76 wt%, 2.77 wt%, 2.78 wt%, 2.79 wt%, 2.80 wt%, 2.81 wt%, 2.82 wt%, 2.83 wt%, 2.84 wt%, 2.85 wt%, 2.86 wt%, 2.87 wt%, 2.88 wt%, 2.89 wt%, 2.90 wt%, 2.91 wt%, 2.92 wt%, 2.93 wt%, 2.94 wt%, 2.95 wt%, 2.96 wt%, 2.97 wt%.

[0027] The content of Mn is 0.5 - 0.7 wt%, specifically, the content of Mn is 0.62 - 0.68 wt%, more specifically, the content of Mn is 0.63 - 0.67 wt%; in the present application, the content of Mn is 0.51 wt%, 0.52 wt%, 0.53 wt%, 0.54 wt%, 0.55 wt%, 0.56 wt%, 0.57 wt%, 0.58 wt%, 0.59 wt%, 0.60 wt%, 0.61 wt%, 0.64 wt%, 0.65 wt%, 0.66 wt%, 0.69 wt%.

[0028] The content of P is 0.6 - 1.5 wt%, specifically, the content of P is 0.62 - 0.75 wt%; in the present application, the content of P is 0.61 wt%, 0.63 wt%, 0.64 wt%, 0.65 wt%, 0.66 wt%, 0.67 wt%, 0.68 wt%, 0.69 wt%, 0.70 wt%, 0.71 wt%, 0.72 wt%, 0.73 wt%, 0.74 wt%, 0.75 wt%, 0.8 wt%, 0.9 wt%, 1.0 wt%, 1.1 wt%, 1.2 wt%.

[0029] The content of S is 0 to 0.11 wt%, specifically, the content of S is 0.06 to 0.11 wt%; in the present application, the content of S is 0.01 wt%, 0.03 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 0.10 wt% or 0.11 wt%.

[0030] In some specific embodiments, the content of C is 3.75%, the content of Si is 2.54%, the content of Mn is 0.675%, the content of P is 0.625%, the content of S is 0.105%, and the balance is Fe.

[0031] The eutectic phosphorus pig iron provided by the present application controls the proportion of each element reasonably, so that the obtained eutectic phosphorus pig iron is used in the aluminum electrolysis anode, which can improve the connection strength and resistance, reduce the iron-carbon voltage drop, not only can optimize the energy efficiency in the aluminum electrolysis process, but also ensure the stability and reliability of the anode assembly during use. The above-mentioned eutectic phosphorus pig iron improves the fluidity of the molten iron while effectively avoiding the cold brittleness phenomenon of the phosphorus pig iron at high temperature, thus showing more excellent performance and higher economic benefits in actual production.

[0032] In some specific embodiments, the preparation method of the eutectic phosphorus pig iron includes the following steps:

[0033] Weigh the ingredients according to the composition ratio of the eutectic phosphorus pig iron, mix them and then carry out smelting;

[0034] Cast the molten iron after smelting, and it will form after cooling.

[0035] In the preparation method of the eutectic phosphorus pig iron, the raw materials for weighing include foundry iron, ferrophosphorus, ferrosilicon and ferromanganese. There is no special limitation on the sources of the above raw materials in the present application. The smelting is carried out according to the method well-known to those skilled in the art, that is, the raw materials after weighing are melted according to the heating curve, slag is skimmed off, and then the molten iron is tapped out of the furnace. The tapping temperature of the molten iron is 1400 to 1500 °C. In some specific embodiments, the tapping temperature of the molten iron is 1421 to 1430 °C.

[0036] After smelting, the present application casts the molten iron after smelting, and it will form after cooling; the casting, the cooling and the forming are technical means well-known to those skilled in the art, and no special limitation is made here.

[0037] Furthermore, the present application also provides an anode carbon block group for an aluminum electrolysis cell, which includes steel claws, eutectic phosphorus pig iron and carbon blocks, and the steel claws and the carbon blocks are connected by the eutectic phosphorus pig iron; wherein, the eutectic phosphorus pig iron is the eutectic phosphorus pig iron described in the above scheme.

[0038] In some specific embodiments, the preparation method of the anode carbon block group for the aluminum electrolysis cell includes the following steps:

[0039] Weigh the raw materials according to the component ratio of the eutectic phosphorus pig iron, mix them and then carry out smelting.

[0040] Pour the molten iron after smelting into the tundish, and use the tundish to inject the molten iron into the carbon bowl for bonding between the steel claw and the carbon block. After the molten iron cools down, the anode carbon block group of the aluminum electrolytic cell is obtained.

[0041] In the above preparation method of the anode carbon block group of the aluminum electrolytic cell, the above smelting process has been described in detail above and will not be elaborated here.

[0042] According to the present invention, then pour the molten iron after smelting into the tundish, and use the tundish to inject the molten iron into the carbon bowl for bonding between the steel claw and the carbon block. After the molten iron cools down, the anode carbon block group of the aluminum electrolytic cell is obtained.

[0043] The eutectic phosphorus pig iron provided by the present invention optimizes the chemical composition of the phosphorus pig iron by adjusting the ratio of the silicon content and the phosphorus content, achieving the effects of reducing the iron-carbon voltage drop, improving the fluidity during the casting process, and eliminating problems such as ring cracks and shrinkage porosity. While reducing the content of eutectic phosphorus, the eutectic phosphorus pig iron improves the voltage drop of the aluminum-carbon anode, reduces the voltage loss in the electrolysis production, makes the electrolysis process more stable and saves the power consumption. At the same time, the present invention controls the ratio of eutectic phosphorus to ensure the maximization of the current efficiency of the electrolytic cell, avoiding the adverse effects of phosphorus and sulfur elements on the performance of the phosphorus pig iron, thereby improving the overall production efficiency.

[0044] To further understand the present invention, the following examples are used to elaborate in detail the eutectic phosphorus pig iron provided by the present invention and its application. The protection scope of the present invention is not limited by the following examples.

[0045] Example 1

[0046] The first group of examples and the first group of comparative examples are respectively carried out for batching, smelting, sampling, casting, anode assembly and marking, slotting, and testing. The specific process flow is as follows:

[0047] According to the element content requirements of ordinary phosphorus pig iron and the eutectic phosphorus pig iron of the present application, calculate the ratio of the raw materials of foundry iron, ferrophosphorus, ferrosilicon, and ferromanganese, and alternately add the raw materials of ferrophosphorus, ferrosilicon, and ferromanganese into the intermediate frequency induction furnace for smelting. Each group of tests is carried out for smelting in the same intermediate frequency induction furnace. After melting and skimming according to the normal production heating curve, record the tapping temperature of the molten iron as 1421 °C. Pour the molten iron into the ladle, and use the ladle to inject the high-temperature molten iron into the carbon bowl for assembly bonding between the steel claw and the carbon block, and observe its fluidity during casting. After the molten iron cools and solidifies, the anode carbon block group of the aluminum electrolytic cell is formed.

[0048] After casting, drill a hole with a diameter of Ф15mm and a depth of 60mm at a distance of 3cm from the phosphor cast iron ring on 12 selected test anode carbon blocks and 12 comparison anode carbon blocks; prepare 24x6 (144 pieces) steel bars with a length of 500mm, and install 6 steel bars in each anode group; 72 of the steel bars are sharpened, and the sharpened steel bars are driven into the drilled holes at a distance of 3cm from the phosphor cast iron ring; the other 72 are welded to the steel claws, and the welding points are 4cm above the carbon bowls. The steel bars are angled at 45 degrees towards the outside of the steel claws for measuring the Fe-C voltage drop; finally, spray paint and mark the anode groups. Example group 1 uses red spray paint, and comparative example group 1 uses blue spray paint, waiting to be used for changing anodes in the cell;

[0049] After the above preparations are completed, the anodes are put into the cell.

[0050] This example mainly examines the periodic change of the iron-carbon voltage drop in the electrolytic cell. Since the anode is in a continuously heating state when it is first put into the cell, the current gradually increases and tends to be stable. There are large test errors in the data of the first 2 days, so the measurement starts from the 3rd day; the test tools used are a mechanical watch with high precision in the magnetic field, a customized anti-magnet box, and a copper measuring rod contact. The temperature and current distribution are measured using the factory's temperature gun and equidistant voltage drop test rod.

[0051] Starting from the third day after putting into the cell, on-line detection of the Fe-C voltage drop is carried out. The test time is 10:00 am every day. Use an infrared thermometer to measure the surface temperature of the aluminum busbar, use an equidistant voltage drop rod to measure the equidistant voltage drop of the aluminum busbar, use a measuring rod and a millivoltmeter to measure the Fe-C voltage drop, measure once a day, measure a complete working cycle of an anode, and calculate the phosphor cast iron voltage drop through current weighting. Measure and record the anode data of the test electrodes and comparison electrodes every day (the results are shown in Table 2), and observe the working states of the test cell and the comparison cell.

[0052] The element compositions of the above Example group 1 and Comparative example group 1 are shown in Table 1;

[0053] Table 1 Element composition data table of Example group 1 and Comparative example group 1 (wt%)

[0054]

[0055] Table 2 Voltage drop comparison data table of Example group 1 and Comparative example group 1

[0056]

[0057]

[0058]

[0059] Plot the periodic change of the iron-carbon voltage drop when the phosphor cast iron prepared by three enterprises in the prior art is applied in aluminum electrolysis, as Figure 1As shown, the Example Group 1 and the Comparative Example Group 1 were analyzed comparatively, as Figure 2 shown; from Figure 1 and Figure 2 it can be seen that as the operation time of the anode in the cell increases, the iron-carbon voltage drop gradually decreases, and the trend of the periodic change of the iron-carbon voltage drop is consistent. The main reason is that as the operation time increases, the temperature of the phosphor cast iron gradually rises and the volume gradually expands, making the contact effect between the steel claw and the carbon block better and better. Therefore, the iron-carbon voltage drop gradually decreases; the average value of the iron-carbon voltage drop of Company A is 68 mV, that of Company B is 65 mV, and that of Company C is 79 mV. The values of Company A and Company B are basically the same, and Company C has the highest value, indicating that the phosphor cast iron components of Company A and Company B are relatively appropriate, and the phosphor cast iron components of Company C need to be further adjusted; the average value of the iron-carbon voltage drop of the Comparative Example Group 1 is 69.02 mV, which is similar to the test result of Company A, while the average value of the iron-carbon voltage drop of the Example Group 1 is 52.52 mV, indicating that the components of the eutectic phosphor cast iron in the Example Group 1 have more advantages in reducing the voltage drop.

[0060] Upon observation, when the eutectic phosphor cast iron of the Example Group 1 is applied in aluminum electrolysis, the production indexes of the electrolytic cell operate in balance, the steel claws do not fall off, and the steel claws have good conductivity without any bad phenomena such as cracking and breaking off.

[0061] Example 2

[0062] The components of the eutectic phosphor cast iron provided in this example are shown in Table 3;

[0063] Table 3 Composition data table of eutectic phosphor cast iron (wt%)

[0064] Group C Si Mn P S Fe Comparative Example Group 2 3.75 2.2 1 0.625 0.105 Balance Example Group 2 3.75 2.2 0.675 0.625 0.105 Balance

[0065] Table 4 Performance data table of eutectic phosphor cast iron

[0066]

[0067]

[0068] As can be seen from Table 4, the content of Mn in the Comparative Example Group 2 is not within the scope of this application. Its viscosity and tensile strength are comparable to those of the Example Group 2, but the conductivity of the Example Group 2 is more excellent. Thus, it shows that the Mn element is of great significance for improving the conductivity.

[0069] Example 3

[0070] The components of the eutectic phosphor cast iron provided in this example are shown in Table 5;

[0071] Table 5 Composition data table of eutectic phosphor cast iron (wt%)

[0072] Group C Si Mn P S Fe Comparative Example Group 3 3.3 2.2 1 1 0.05 Balance Example Group 3 3.3 2.2 0.675 1 0.05 Balance

[0073] Table 6 Performance data table of eutectic phosphorus cast iron

[0074] <![CDATA[Conductivity (10 6 S / m)]]> Viscosity (mPa·s) Comparative Example Group 3 4.39 4.32 Example Group 3 4.41 4.31

[0075] As can be seen from Table 6, the content of Mn in Comparative Example Group 3 is not within the scope of this application, and its viscosity is comparable to that of Example Group 3. However, the conductivity of Example Group 3 is more excellent. Thus, it shows that the Mn element is of great significance for improving the conductivity.

[0076] Example 4

[0077] The composition of the eutectic phosphorus cast iron provided in this example is shown in Table 7;

[0078] Table 7 Composition data table of eutectic phosphorus cast iron (wt%)

[0079] C Si Mn P S Fe Comparative Example Group 1 3.425 2 0.925 1.4 0.135 Balance Comparative Example Group 4 3.75 1.75 0.675 1 0.105 Balance Example Group 1 3.75 2.54 0.675 0.625 0.105 Balance

[0080] Table 8 Performance data table of eutectic phosphorus cast iron

[0081]

[0082] Compared with Comparative Example Group 1 and Comparative Example Group 4, the volume shrinkage rate and viscosity of Example Group 1 are more excellent. Although the conductivity and tensile strength of Example Group 1 are slightly worse than those of the comparative example groups, the above conductivity, volume shrinkage rate, viscosity, and tensile strength all affect the reduction of pressure drop, and Example Group 1 is more excellent in reducing pressure drop; compared with Comparative Example Group 1 and Comparative Example Group 4, the phosphorus eutectic degree of the eutectic phosphorus cast iron prepared in Example Group 1 is reduced more, only being 16.35%.

[0083] The description of the above examples is only used to help understand the method of the present invention and its core idea. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0084] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A eutectic phosphorus cast iron, characterized in that, By mass percentage, it includes: C 2.0 - 3.8%, Si 2.0 - 3.0%, Mn 0.5 - 0.7%, P 0.6 - 1.5%, S 0 - 0.11%, Fe 91.5 - 95.4%.

2. The eutectic phosphorus cast iron according to claim 1, characterized in that, The content of C is 3.6 - 3.8%, and / or the content of Si is 2.54 - 2.98%.

3. The eutectic phosphorus pig iron according to claim 1, characterized in that, The content of Mn is 0.62 - 0.68%.

4. The eutectic phosphorus pig iron according to claim 1, wherein The content of P is 0.62 - 0.75%.

5. The eutectic phosphorus pig iron according to claim 1, characterized in that, The content of S is 0.06 - 0.11%.

6. The eutectic phosphorus pig iron according to claim 1, wherein, The content of C is 3.75%, the content of Si is 2.54%, the content of Mn is 0.675%, the content of P is 0.625%, the content of S is 0.105%, and the balance is Fe.

7. The eutectic phosphorus pig iron according to claim 1, characterized in that, The preparation method of the eutectic ferrophosphorus includes the following steps: Weigh the materials according to the composition ratio of the eutectic ferrophosphorus, mix them and then carry out smelting; Pour the molten iron after smelting into a tundish, and use the tundish to inject the molten iron into a carbon bowl for bonding between the steel claw and the carbon block. After the molten iron cools, an anode carbon block group for an aluminum electrolytic cell is obtained.

8. The eutectic phosphorus cast iron according to claim 7, wherein The raw materials for weighing the materials include pig iron, ferrophosphorus, ferrosilicon and ferromanganese; and / or the tapping temperature of the molten iron after smelting is 1400 - 1500 °C.

9. An anode carbon block group for an aluminum electrolytic cell, comprising a steel claw, eutectic ferrophosphorus and a carbon block, wherein the steel claw and the carbon block are connected by the eutectic ferrophosphorus; The eutectic ferrophosphorus is the eutectic ferrophosphorus according to any one of claims 1 - 8.

10. The anodic carbon block group of the aluminum electrolytic cell according to claim 9, characterized in that, The preparation method of the anode carbon block group for an aluminum electrolytic cell includes the following steps: Weigh the materials according to the composition ratio of the eutectic ferrophosphorus, mix them and then carry out smelting; Pour the molten iron after smelting into a tundish, and use the tundish to inject the molten iron into a carbon bowl for bonding between the steel claw and the carbon block. After the molten iron cools, an anode carbon block group for an aluminum electrolytic cell is obtained.

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