Phosphorus pig iron carbonization carburant

Abstract

The invention provides a phosphorus pig iron carbonization carburant and a preparation and use method thereof, relates to the technical field of aluminum electrolysis production, and solves the technical problem that the environment is possibly polluted or the cost is too high when an existing waste cathode is used as a phosphorus pig iron carburant. The carbonization recarburizing agent provided by the invention comprises the following components: 60 wt% to 66 wt% of carbon, 10 wt% to 12 wt% of SiC, 6 wt% to 8 wt% of NaNO2, 6 wt% to 7 wt% of CaO, 2 wt% to 5 wt% of CaC2 and 8 wt% to 10 wt% of a mixed binder, the carbon comprises 15 wt%-20 wt% of wood carbonized particles and 40 wt%-45 wt% of waste electrolysis cathodes. The carbon content in the phosphorus pig iron can be adjusted, so that the conductivity, the fluidity and the cold brittleness of the phosphorus pig iron are improved, and the anode assembly performance is improved; and the utilization efficiency of the carburant is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum electrolysis production, and in particular to a phosphorus pig iron carburizing recarburizer. Background Art

[0002] Anode carbon blocks for aluminum are assembled by casting and connecting phosphorus pig iron and aluminum guide rods. The elements in phosphorus pig iron mainly include carbon, silicon, manganese, phosphorus and sulfur. The proportion of the above elements has a great influence on the casting quality of anode carbon blocks and the control of electrolytic production indicators.

[0003] Carbon in phosphorus pig iron can promote the precipitation of graphite and reduce the shrinkage of cast iron after cooling. After casting, phosphorus pig iron rings are not easy to loosen or crack. Carbon is an element that has a great influence on the shape and size of graphite. When the carbon content is between 1.7% and 2.0%, the graphite is distributed in a network; when the carbon content is between 2.0% and 2.6%, intergranular graphite appears; when the carbon content is between 2.6% and 3.5%, the graphite appears in normal flakes; when the carbon content exceeds 3.5%, initial flake graphite appears. Therefore, when the carbon content is between 2.6% and 3.5%, the graphite flakes are small and evenly distributed, and for pig iron, the tensile strength is the highest. Sulfur in phosphorus pig iron is a harmful substance in phosphorus pig iron. Sulfur is basically insoluble in phosphorus pig iron and is an element that strongly hinders graphitization. Hot brittle cracking will occur at 900°C. In production, sulfur should be removed from phosphorus pig iron water as much as possible to reduce pressure drop. At the same time, it also reduces the fluidity of phosphorus pig iron water and deteriorates casting performance. Excessive sulfur content will cause phosphorus pig iron rings to burst. When the sulfur content exceeds 0.20%, the fluidity of molten iron deteriorates, and the contact resistance between phosphorus pig iron and carbon increases, which is not conducive to electrolytic process control. Generally, the sulfur content is controlled to be ≤0.20%. Due to the recycling of phosphorus pig iron, carbon elements are continuously burned or consumed during the electrolytic production process, and the sulfides in the carbon blocks are continuously transferred to the phosphorus pig iron, and the content is continuously enriched, resulting in the failure of the main control components to meet the standards.

[0004] The new carbonized recarburizer is a mixed additive made of water, silicon carbide ramming material, silicon carbide fire clay, calcium oxide, industrial salt, waste cathode and other elements in a certain proportion, which is widely used in medium frequency induction furnace smelting. The proportioned recarburizer is added to the medium frequency induction furnace smelting and repeatedly recycled phosphorus pig iron. The purpose is to adjust the composition of the smelting medium by adding the recarburizer, extend the service life of the medium frequency furnace, ensure the carbon element compliance rate, improve the anode casting quality, reduce the iron-carbon pressure drop ring, and improve the electrolytic production efficiency.

[0005] For example, the patent with publication number CN106868246A proposes an environmentally friendly phosphorus pig iron additive, its preparation method and phosphorus pig iron carbonization and desulfurization method, which uses cathode carbon blocks as carbon materials, combined with other binders and carbonates. The preparation method is simple, the additive is low in cost, and the effect of carbonization and desulfurization of phosphorus pig iron is good. However, when using waste cathodes as carbon materials, there are toxic substances such as fluorides and cyanides in the waste cathodes in addition to carbon. If not handled properly, it may cause pollution to the environment. Excessive processing will increase the processing cost, which will exceed the processing cost of the waste cathode itself and the purchase cost of other carbon sources. Summary of the invention

[0006] The invention provides a phosphorus pig iron carbonization recarburizer to solve the technical problem that the use of existing waste cathode as a phosphorus pig iron recarburizer may cause environmental pollution or excessive cost.

[0007] The embodiments of the present invention are implemented by the following technical solutions:

[0008] A phosphorus pig iron carbonization recarburizer, which comprises the following components based on 100wt% of the recarburizer mass: 60wt% to 66wt% of carbon, 10wt% to 12wt% of SiC, 6wt% to 8wt% of NaNO2, 6wt% to 7wt% of CaO, 2wt% to 5wt% of CaC2 and 8wt% to 10wt% of a mixed binder; the carbon comprises 15wt% to 20wt% of wood carbonized particles and 40wt% to 45wt% of electrolytic waste cathodes.

[0009] Preferably, based on 100wt% of the mass of the recarburizer, the mixed binder includes 3wt% to 4wt% of phenolic resin and 5wt% to 6wt% of asphalt.

[0010] Preferably, the carbon content of the electrolytic waste cathode is ≥80wt%, and the NaF content is ≤5wt%; the carbon content of the wood carbonized particles is ≥70wt%; and the ratio of the carbon content of the wood carbonized particles to the carbon content of the electrolytic waste cathode is 1:2 to 2.3.

[0011] Preferably, the recarburizer particle size is 0.5mm-5mm. For electric furnace smelting below one ton, the recarburizer particle size is 0.5mm-2.5mm; for electric furnace smelting above one ton, the recarburizer particle size is 2.5mm-5mm.

[0012] A method for preparing the phosphorus pig iron carbonization recarburizer comprises the following steps:

[0013] S1: preparing a mixed binder;

[0014] S2: 60wt% to 66wt% of carbon, 10wt% to 12wt% of SiC, 6wt% to 8wt% of NaNO2, 6wt% to 7wt% of CaO, 2wt% to 5wt% of CaC2 and 8wt% to 10wt% of a mixed binder are mixed and then briquetting to obtain a recarburizer block;

[0015] S3: The recarburizer block is heated and solidified, and then calcined to obtain the recarburizer.

[0016] Preferably, the step S1 includes the following specific steps: preheating 5wt% to 6wt% of asphalt to 120°C to 150°C, and mixing with 3wt% to 4wt% of phenolic resin to obtain a mixed binder.

[0017] Preferably, in step S3, the heating and curing temperature of the recarburizer block is 100°C to 130°C, and the calcination temperature is 800°C to 1000°C.

[0018] A method for using the phosphorus pig iron carbonization recarburizer comprises the following steps:

[0019] T1: Add part of the charge to melt, and add part of the recarburizer to the molten charge;

[0020] T2: Add the remaining charge, press the carburizer into the molten iron, and raise the temperature after the carburizer is dissolved in the molten iron;

[0021] T3: Continuously test the carbon content of the molten iron, adjust the amount of carburizer according to the carbon content, and carry out the furnace unloading operation until the carbon content reaches the standard;

[0022] T4: Put part of the recarburizer into a bag or into an iron trough and flush it in with the flow to replenish the dissolution of the recarburizer.

[0023] Preferably, in the steps T1 and T2, the temperature of the molten iron is maintained at 1250°C to 1300°C, and after heating, the temperature of the molten iron is ≥1350°C;

[0024] Taking the total amount of the recarburizer as 100%, in step T1, 75% to 80% of the recarburizer is added; in step T3, 5% to 20% of the recarburizer is added; in step T4, 2% to 5% of the recarburizer is added.

[0025] An application of the phosphorus pig iron carbonization recarburizer is to adjust the phosphorus pig iron grafting component. Based on the phosphorus pig iron mass as 100wt%, the amount of the recarburizer is 0.6wt% to 1.6wt%.

[0026] By adopting this technical solution, the carbon content in phosphorus pig iron can be adjusted by a precisely proportioned carburizer, thereby improving its conductivity, fluidity and cold brittleness, and improving the performance of anode assembly. By using electrolytic waste cathode and wood carbonized particles as carbon sources, the resource utilization of waste is realized, the cost of raw materials is reduced, and it is helpful to environmental protection. By increasing the carbon content, the conductivity of phosphorus pig iron can be improved, the difficulty of casting phosphorus pig iron during anode assembly can be reduced, and the anode iron-carbon pressure drop during electrolysis can be reduced. The addition of carburizer helps to generate a large number of uniformly distributed heterogeneous graphite crystal cores in phosphorus pig iron, improves the cast iron structure, and helps to reduce the iron-carbon pressure drop of the anode. Through the optimized carburizing process, the quality problems in the recycling process of phosphorus pig iron can be reduced, and the production efficiency and anode assembly quality can be improved. By controlling the particle size of the carburizer, its absorption rate and dissolution rate in molten iron can be increased, thereby improving the carburizing efficiency. Through the preparation of mixed binders and the curing calcining process, a carburizer with stable performance can be prepared, which helps to improve the use effect and operation convenience of the carburizer. Through the step-by-step use method, the effective dissolution and absorption of the recarburizer during the smelting process can be ensured, while the temperature of the molten iron is kept appropriate to avoid quality problems caused by overheating or unevenness. By using this recarburizer, the conductivity and connection performance of the anode can be improved, the probability of anode shedding can be reduced, and the service life of the anode can be increased.

[0027] For the fluoride and cyanide in the waste cathode, adding wood carbonized particles and mixing them with the waste cathode can improve its overall calorific value, and its porous structure helps to improve the microstructure of the waste cathode, thereby improving its electrical conductivity and thermal conductivity. At the same time, wood carbonized particles help to promote the separation of fluoride and other inorganic compounds in the waste cathode at high temperature, and remove fluoride under high temperature calcination with silicon carbide; while removing fluoride, excess silicon carbide is retained in the recarburizer and added to the phosphorus pig iron water to increase the carbon and silicon content in the phosphorus pig iron; wood carbonized particles have a lower carbon content, while waste cathodes have a higher carbon content, but more impurities. By reasonably matching the content of wood carbonized particles and waste cathodes, it is ensured that the carbon has a higher carbon content and a lower impurity content, thereby achieving full and reasonable utilization of electrolytic waste cathodes;

[0028] In addition to silicon carbide, NaNO2 in the recarburizer can improve the combustion value of the recarburizer while serving as an oxidant for some reactions, accelerating the reaction rate and degree of reaction, ensuring a lower impurity content in the phosphorus pig iron. CaO and CaC2 can improve the slag fluidity while reducing the sulfur content in the phosphorus pig iron.

[0029] When using the above-mentioned recarburizer, most of the recarburizer is added to the low-temperature molten iron in which part of the charge is dissolved through the low-temperature recarburization process, and then the remaining charge is added to press all the recarburizer into the molten iron to ensure that the recarburizer does not float on the surface of the molten iron, so as to reduce oxidation and burning loss, and improve the efficiency of recarburization and reducing sulfur content; after the recarburizer is fully dissolved in the molten iron at low temperature, the temperature is raised to the normal temperature of the furnace body to ensure the normal dissolution and diffusion of the recarburizer, and effectively improve the utilization efficiency of the recarburizer.

[0030] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0031] 1. The present invention can adjust the carbon content in phosphorus pig iron, thereby improving its conductivity, fluidity and cold brittleness, and improving the performance of anode assembly;

[0032] 2. The wood carbonized particles of the present invention help to promote the separation of fluoride and other inorganic compounds in the waste cathode at high temperature, and remove fluoride under high temperature calcination with silicon carbide; by reasonably matching the content of wood carbonized particles and waste cathode, the full and reasonable utilization of electrolytic waste cathode is achieved;

[0033] 3. The present invention ensures that the recarburizer does not float on the surface of the molten iron through a low-temperature recarburization process, thereby reducing oxidation and burning, improving the efficiency of recarburization and reducing sulfur content, and improving the utilization efficiency of the recarburizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic process flow diagram of the preparation method and use method of the phosphorus pig iron carburizing recarburizer provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0037] The following table shows the composition and content of phosphorus pig iron produced in the production workshop where the inventor works:

[0038]

[0039] Example 1

[0040] A phosphorus pig iron carbonization recarburizer, which comprises the following components based on 100wt% of the recarburizer mass: 63wt% of carbon, 11wt% of SiC, 7wt% of NaNO2, 6.5wt% of CaO, 3.5wt% of CaC2 and 9wt% of a mixed binder; the carbon comprises 18wt% of wood carbonized particles and 45wt% of electrolytic waste cathodes.

[0041] In this embodiment, based on 100 wt% of the mass of the recarburizer, the mixed binder includes 3 wt% of phenolic resin and 6 wt% of asphalt.

[0042] In this embodiment, the carbon content of the electrolytic waste cathode is 80wt%; the carbon content of the wood carbonized particles is 70wt%; and the ratio of the carbon content of the wood carbonized particles to the carbon content of the electrolytic waste cathode is 1:2.1875.

[0043] In this embodiment, for the electric furnace smelting of this embodiment, the particle size of the recarburizer is in the range of 0.5 mm-2.5 mm.

[0044] A method for preparing the phosphorus pig iron carbonization recarburizer comprises the following steps:

[0045] S1: preparing a mixed binder;

[0046] S2: 63wt% of carbon, 11wt% of SiC, 7wt% of NaNO2, 6.5wt% of CaO, 3.5wt% of CaC2 and 9wt% of a mixed binder are mixed and then pressed into blocks to obtain a recarburizer block;

[0047] S3: The recarburizer block is heated and solidified, and then calcined to obtain the recarburizer.

[0048] In this embodiment, the step S1 includes the following specific steps: preheating 6 wt % of asphalt to 120° C. to 150° C. and mixing with 3 wt % of phenolic resin to obtain a mixed adhesive.

[0049] In this embodiment, in step S3, the heating and curing temperature of the recarburizer block is in the range of 100°C to 130°C, and the calcining temperature is in the range of 800°C to 1000°C.

[0050] A method for using the phosphorus pig iron carbonization recarburizer comprises the following steps:

[0051] T1: Add part of the charge to melt, and add part of the recarburizer to the molten charge;

[0052] T2: Add the remaining charge, press the carburizer into the molten iron, and raise the temperature after the carburizer is dissolved in the molten iron;

[0053] T3: Continuously test the carbon content of the molten iron, adjust the amount of carburizer according to the carbon content, and carry out the furnace unloading operation until the carbon content reaches the standard;

[0054] T4: Put part of the recarburizer into a bag or into an iron trough and flush it in with the flow to replenish the dissolution of the recarburizer.

[0055] In this embodiment, in the steps T1 and T2, the temperature of the molten iron is maintained at 1250°C to 1300°C, and after heating, the temperature of the molten iron is 1350°C;

[0056] Taking the total amount of the recarburizer as 100%, in step T1, 80% of the recarburizer is added; in step T3, 18% of the recarburizer is added; and in step T4, 2% of the recarburizer is added.

[0057] An application of the phosphorus pig iron carbonization recarburizer is characterized in that it is used to adjust the phosphorus pig iron grafting component, and the amount of the recarburizer is 1.1wt% based on the mass of the phosphorus pig iron as 100wt%.

[0058] Example 2

[0059] The only difference between this embodiment and embodiment 1 is that a phosphorus pig iron carbonization recarburizer, based on the mass of the recarburizer being 100wt%, comprises the following components: 60wt% of carbon, 12wt% of SiC, 8wt% of NaNO2, 6.5wt% of CaO, 3.5wt% of CaC2 and 10wt% of a mixed binder; the carbon comprises 15wt% of wood carbonized particles and 45wt% of electrolytic waste cathode; the mixed binder comprises 4wt% of phenolic resin and 6wt% of asphalt.

[0060] Example 3

[0061] The only difference between this embodiment and embodiment 1 is that a phosphorus pig iron carbonization recarburizer, based on the mass of the recarburizer being 100wt%, comprises the following components: 62wt% of carbon, 10wt% of SiC, 6wt% of NaNO2, 7wt% of CaO, 5wt% of CaC2 and 10wt% of a mixed binder; the carbon comprises 17wt% of wood carbonized particles and 45wt% of electrolytic waste cathode; the mixed binder comprises 4wt% of phenolic resin and 6wt% of asphalt.

[0062] Example 4

[0063] The only difference between this embodiment and embodiment 1 is that a phosphorus pig iron carbonization recarburizer, based on the mass of the recarburizer being 100wt%, comprises the following components: 62wt% of carbon, 11wt% of SiC, 7wt% of NaNO2, 6wt% of CaO, 5wt% of CaC2 and 9wt% of a mixed binder; the carbon comprises 17wt% of wood carbonized particles and 45wt% of electrolytic waste cathode; the mixed binder comprises 3wt% of phenolic resin and 6wt% of asphalt.

[0064] Example 5

[0065] The only difference between this embodiment and embodiment 1 is that a phosphorus pig iron carbonization recarburizer, based on the mass of the recarburizer being 100wt%, comprises the following components: 65wt% of carbon, 11wt% of SiC, 7wt% of NaNO2, 6wt% of CaO, 2wt% of CaC2 and 9wt% of a mixed binder; the carbon comprises 20wt% of wood carbonized particles and 45wt% of electrolytic waste cathode; the mixed binder comprises 3wt% of phenolic resin and 6wt% of asphalt.

[0066] Example 6

[0067] The only difference between this embodiment and embodiment 1 is that the carbon comprises 20 wt % of wood carbonized particles and 43 wt % of electrolytic waste cathodes.

[0068] Example 7

[0069] The difference between this embodiment and embodiment 1 is that, in this embodiment, based on the total amount of the recarburizer being 100%, in step T1, 75% of the recarburizer is added; in step T3, 20% of the recarburizer is added; and in step T4, 5% of the recarburizer is added.

[0070] Example 8

[0071] The difference between this embodiment and embodiment 1 is that, in this embodiment, an application of the phosphorus pig iron carbonization recarburizer is used to adjust the phosphorus pig iron grafting component, and the amount of the recarburizer is 1.6wt% based on the mass of the phosphorus pig iron as 100wt%.

[0072] Example 9

[0073] The difference between this embodiment and embodiment 1 is that, in this embodiment, an application of the phosphorus pig iron carbonization recarburizer is used to adjust the phosphorus pig iron grafting component, and the amount of the recarburizer is 0.6wt% based on the mass of the phosphorus pig iron as 100wt%.

[0074] Comparative Example 1

[0075] The only difference between this comparative example and Example 1 is that the recarburizer includes the following components: 66.5wt% of carbon, 11wt% of SiC, 7wt% of NaNO2, 6.5wt% of CaO and 9wt% of a mixed binder; the carbon includes 18wt% of wood carbonized particles and 45wt% of electrolytic waste cathode, and the addition of calcium carbide is eliminated in this comparative example.

[0076] Comparative Example 2

[0077] The difference between this comparative example and Example 1 is that the binder of the carburizer is a common organic binder phenolic resin.

[0078] Comparative Example 3

[0079] The only difference between this comparative example and Example 1 is that the recarburizer is added into the furnace all at once by conventional methods.

[0080] The relevant data of the above embodiments and comparative examples are shown in Table 2 and Table 3 below:

[0081] Table 2. Examples 1-6 and Comparative Example 1 - Recarburizer component related data

[0082]

[0083]

[0084] Table 3. Carburizer addition amount data for Examples 1, 7-9 and Comparative Example 3

[0085]

[0086] The component contents of phosphorus pig iron molten iron produced in different batches of the above Examples 1-9 and Comparative Examples 1-3 are shown in Table 4 below:

[0087] Table 4. Phosphorus Pig Iron Component Contents in Examples 1-9 and Comparative Examples 1-3

[0088] Example C (wt%) S (wt%) Fe(wt%) Example 1 3.379％ 0.42％ 93.45％ Example 2 3.412％ 0.51％ 92.93％ Example 3 3.395％ 0.42％ 92.56％ Example 4 3.368％ 0.41％ 92.78％ Example 5 3.524％ 0.62 92.53％ Example 6 3.125％ 0.54％ 92.42％ Example 6 3.197％ 0.32％ 92.42％ Example 7 3.359％ 0.63％ 92.61％ Example 8 3.13％ 0.57％ 92.56％ Example 9 3.612％ 0.62％ 92.39％ Comparative Example 1 2.478％ 0.68％ 91.93％ Comparative Example 2 2.489％ 0.65％ 91.56％ Comparative Example 3 2.826％ 0.71％ 92.83％

[0089] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phosphorus pig iron carbonization recarburizer, characterized in that: Taking the mass of the recarburizer as 100wt%, the recarburizer includes the following components: 60wt% to 66wt% of carbon, 10wt% to 12wt% of SiC, 6wt% to 8wt% of NaNO2, 6wt% to 7wt% of CaO, 2wt% to 5wt% of CaC2 and 8wt% to 10wt% of a mixed binder; the carbon includes 15wt% to 20wt% of wood carbonized particles and 40wt% to 45wt% of electrolytic waste cathode.

2. A phosphorus pig iron carbonization recarburizer according to claim 1, characterized in that: Based on 100wt% of the mass of the recarburizer, the mixed binder includes 3wt% to 4wt% of phenolic resin and 5wt% to 6wt% of asphalt.

3. A phosphorus pig iron carburizing agent according to claim 1, characterized in that: The carbon content of the electrolytic waste cathode is ≥80wt%, and the NaF content is ≤5wt%; the carbon content of the wood carbonized particles is ≥70wt%; the ratio of the carbon content of the wood carbonized particles to the carbon content of the electrolytic waste cathode is 1:2-2.

3.

4. A phosphorus pig iron carbonization recarburizer according to claim 1, characterized in that: The recarburizer particle size is 0.5mm-5mm. For electric furnace smelting below one ton, the recarburizer particle size is 0.5mm-2.5mm; for electric furnace smelting above one ton, the recarburizer particle size is 2.5mm-5mm.

5. A method for preparing the phosphorus pig iron carbonization recarburizer according to any one of claims 1 to 4, characterized in that: The steps include: S1: preparing a mixed binder; S2: 60wt% to 66wt% of carbon, 10wt% to 12wt% of SiC, 6wt% to 8wt% of NaNO2, 6wt% to 7wt% of CaO, 2wt% to 5wt% of CaC2 and 8wt% to 10wt% of a mixed binder are mixed and then briquetting to obtain a recarburizer block; S3: The recarburizer block is heated and solidified, and then calcined to obtain the recarburizer.

6. The method for preparing a phosphorus pig iron carbonization recarburizer according to claim 5, characterized in that: In the step S1, the following specific steps are included: 5wt% to 6wt% of asphalt is preheated to 120°C to 150°C, and then mixed with 3wt% to 4wt% of phenolic resin to obtain a mixed adhesive.

7. The method for preparing a phosphorus pig iron carbonization recarburizer according to claim 5, characterized in that: In the step S3, the heating and curing temperature of the recarburizer block is 100°C to 130°C, and the calcination temperature is 800°C to 1000°C.

8. A method for using the phosphorus pig iron carbonization recarburizer according to any one of claims 1 to 4, characterized in that: The steps include: T1: Add part of the charge to melt, and add part of the recarburizer to the molten charge; T2: Add the remaining charge, press the carburizer into the molten iron, and raise the temperature after the carburizer is dissolved in the molten iron; T3: Continuously test the carbon content of the molten iron, adjust the amount of carburizer according to the carbon content, and carry out the furnace unloading operation until the carbon content reaches the standard; T4: Put part of the recarburizer into a bag or into an iron trough and flush it in with the flow to replenish the dissolution of the recarburizer.

9. The method for using the phosphorus pig iron carbonization recarburizer according to claim 8, characterized in that: In the steps T1 and T2, the temperature of the molten iron is maintained at 1250° C. to 1300° C., and after heating, the temperature of the molten iron is ≥ 1350° C.; Taking the total amount of the recarburizer as 100%, in step T1, 75% to 80% of the recarburizer is added; in step T3, 5% to 20% of the recarburizer is added; in step T4, 2% to 5% of the recarburizer is added.

10. An application of the phosphorus pig iron carbonization recarburizer according to any one of claims 1 to 4, characterized in that: It is used to adjust the grafted components of phosphorus pig iron. Based on the mass of phosphorus pig iron being 100wt%, the amount of the recarburizer is 0.6wt% to 1.6wt%.

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