Industrial use method for reducing cost by crushing high-manganese pig iron for steelmaking alloy replacement

Abstract

The invention provides an industrial use method for reducing cost by crushing high-manganese pig iron for steel-making alloy replacement. The industrial use method specifically comprises the following steps: (1) crushing a high-manganese pig iron raw material and feeding the high-manganese pig iron raw material through a belt; (2) the adding amount of high-manganese pig iron is planned before smelting, and the charging amount of molten iron and scrap steel is adjusted to increase the tapping temperature; (3) (1) according to the actual steel tapping surplus temperature, the adding amount of pig iron particles is determined according to the standard that 1 t of pig iron particles are correspondingly added every 10 DEG C; (2) calculating the reference increase content of manganese and carbon in the high-manganese pig iron; and (3) calculating manganese d1 which needs to be supplemented by adding the silicon-manganese alloy and carbon d2 which needs to be supplemented by adding the nut coke carburant, and adding the silicon-manganese alloy and the nut coke carburant according to the d1 and the d2. The problem that the manganese element is oxidized and cannot be effectively utilized in the smelting process of common high-manganese pig iron in a conventional use mode is solved, part of alloy replacement in the steelmaking process is finally achieved, efficient, accurate and industrial batch use conditions are achieved, and the purpose of reducing the steelmaking machining cost is achieved.

Description

Technical Field

[0001] The invention relates to the field of metallurgical technology, and in particular to an industrialized method for reducing costs by crushing high manganese pig iron for steelmaking alloy substitution. Background Art

[0002] There are currently two known and commonly used ways of using ordinary high manganese pig iron: one is to add it into the converter as ordinary scrap steel, and the other is to use ton bags or the like to directly add it into the ladle to replace part of the alloy for alloying.

[0003] The first method is to add it into the converter as ordinary scrap steel and smelt it together with molten iron and scrap steel in the converter. This method not only oxidizes the metallic manganese, but also causes 8-10% blow-off of the iron element, resulting in a large cost loss. The second method is to use ton bags, grabbers, etc. to add it into the ladle to replace part of the alloy for alloying. This method is inefficient and has limited alloy substitution.

[0004] The biggest problem and disadvantage of the existing usage method is that it cannot be used efficiently, accurately and in large quantities on an industrial scale, resulting in the manganese in ordinary high manganese pig iron not being able to truly reflect its value, but being wasted. It cannot be used in large-scale industrial production, and the cost reduction space is limited. Summary of the invention

[0005] According to the above technical problem that the existing use of high manganese pig iron easily leads to the loss of manganese element and cannot achieve efficient, accurate and large-scale industrial use, a method for industrial use of crushing high manganese pig iron for steelmaking alloy substitution to reduce costs is provided, which can tap the true value of manganese element in ordinary high manganese pig iron, improve the utilization rate of manganese element, realize industrial large-scale production and batch use, and enable enterprises to reduce steelmaking processing costs.

[0006] The technical means adopted by the present invention are as follows:

[0007] An industrialized method for crushing high manganese pig iron to replace steelmaking alloy and reduce costs, specifically comprising:

[0008] (1) Crushing and belt feeding of high manganese pig iron raw materials: The high manganese pig iron raw materials are fed to the jaw crusher by a grabber. After the crusher is running, the high manganese pig iron with a size of 150mm*150mm is crushed into pig iron particles with a particle size of 10mm-70mm; the pig iron particles are then transported to the low-level silo of the steelmaking plant, and fed into the alloy silo through the operation of various levels of belts;

[0009] (2) Before smelting, the amount of high manganese pig iron added is planned within the range of 1-3 tons, and the surplus temperature is increased by 10°C for every 1 ton of high manganese pig iron added, and the amount of molten iron and scrap steel charged is adjusted to increase the tapping temperature so that the expected tapping temperature meets the temperature requirement for melting the added high manganese pig iron;

[0010] (3) During the tapping alloying process, according to the internal control target composition of the alloy for the steel grade being smelted, the following steps are used to measure and add an appropriate amount of pig iron pellets to partially replace silicomanganese alloy and coke breeze carburizer, increasing the manganese and carbon contents in the molten steel:

[0011] ① According to the actual surplus tapping temperature, determine the addition amount of pig iron pellets according to the standard of adding 1 t of pig iron pellets for every 10 °C, then set the working parameters of the vibrating feeder in the bin, and feed the pig iron pellets into the ladle;

[0012] ② According to the manganese and carbon contents in the high-manganese pig iron raw material and the recovery rates of manganese and carbon in the high-manganese pig iron during the tapping alloying process, calculate the reference increased contents of manganese and carbon in the molten steel after alloying: Reference increased content = mass of added pig iron pellets * content of element in high-manganese pig iron * recovery rate of element / tapping amount per furnace;

[0013] ③ According to the target component contents a1 and a2 of manganese and carbon in the alloy for the steel grade being smelted, the residual contents b1 and b2 of manganese and carbon in the molten steel at the end of smelting, and the calculated reference increased contents c1 and c2 of manganese and carbon corresponding to the high-manganese pig iron, calculate the manganese d1 that still needs to be supplemented by adding silicomanganese alloy and the carbon d2 that needs to be supplemented by adding coke breeze carburizer: d1 = a1 - b1 - c1, d2 = a2 - b2 - c2, and add the corresponding silicomanganese alloy and coke breeze carburizer to the ladle according to d1 and d2.

[0014] Furthermore, high-manganese pig iron with a manganese content greater than 10% is selected as the raw material.

[0015] Furthermore, the mass of silicomanganese alloy that still needs to be added during the alloying process is determined according to d1 = tapping amount per furnace * d1 / 65% / 85%, where 65% is the manganese content in the silicomanganese alloy and 85% is the recovery rate of manganese in the silicomanganese alloy during the tapping alloying process;

[0016] The mass of coke breeze carburizer that still needs to be added during the alloying process is determined according to d2 = tapping amount per furnace * d2 / 82% / 85%, where 82% is the carbon content in the coke breeze carburizer and 85% is the recovery rate of carbon in the coke breeze carburizer during the tapping alloying process.

[0017] Furthermore, the mass of silicomanganese alloy replaced by the added pig iron pellets = mass of added pig iron pellets * content of manganese element in high-manganese pig iron / 65%, where 65% is the manganese content in the silicomanganese alloy;

[0018] The mass of coke breeze carburizer replaced by the added pig iron pellets = mass of added pig iron pellets * content of carbon element in high-manganese pig iron / 82%, where 82% is the carbon content in the coke breeze carburizer.

[0019] Furthermore, the chemical composition of the high-manganese pig iron used includes: C ≥ 3.5%, Si ≤ 1.25%, Mn ≥ 10%, P ≤ 0.250%, S ≤ 0.07%.

[0020] Furthermore, the recovery rates of manganese and carbon in the high-manganese pig iron during the ladle alloying process are both 85%.

[0021] Furthermore, the addition of pig iron particles into the ladle is controlled in batches by a vibrating feeder.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The industrial use method provided by the present invention for substituting high-manganese pig iron after crushing for steelmaking alloys to reduce costs, and the proposed industrial use method of substituting high-manganese pig iron after crushing for alloys can multiply the utilization efficiency of ordinary high-manganese pig iron. At the same time, the utilization value of manganese elements is reflected. Through the crushed high-manganese pig iron, during the tapping process, it can replace the manganese in silicomanganese alloy and the carbon in coke breeze carburizer, and be directly added into the ladle in the form of an alloy and incorporated into the molten steel, enabling the high-manganese pig iron raw material to be 100% converted into molten steel. Thus, it reduces the blow loss caused by directly putting high-manganese pig iron into the converter or refining furnace for smelting and turning it into steel slag. The method of the present invention effectively reduces the oxidation blow loss of high-manganese pig iron in the converter or refining furnace, improves the effective recovery of manganese elements, and at the same time carbon is also effectively utilized, realizing the concept of cost reduction and green low-carbon environmental protection.

[0024] Based on the above reasons, the present invention can be widely promoted in the metallurgical field. Specific Embodiments

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] The present invention provides an industrial use method for substituting high-manganese pig iron after crushing for steelmaking alloys to reduce costs, which is applicable to the molten steel smelting in a converter or a refining furnace, and specifically includes:

[0027] (1) Crushing and feeding the high-manganese pig iron raw materials onto the belt: The high-manganese pig iron raw materials are fed onto a 2000-type jaw crusher using a grab crane. After the crusher operates, the high-manganese pig iron with dimensions above 150mm * 150mm (such as 200mm * 200mm * 100mm) is crushed into pig iron pellets with a particle size of 10mm - 70mm. Then, the pig iron pellets are transported to the low-level bin of the steel mill by truck and fed onto the medium-level and high-level alloy bins of the converter or the designated alloy bin of the refining furnace through the operation of belts F1, F2, F3, and F4.

[0028] (2) Before smelting, plan the addition amount of high-manganese pig iron within the range of 1 - 3t, and adjust the charging amounts of hot metal and scrap according to the surplus temperature increase of 10°C for every 1t of high-manganese pig iron added, so as to increase the tapping temperature and make the expected tapping temperature meet the temperature requirements for melting the added high-manganese pig iron. The tapping surplus temperature refers to the part of the temperature at tapping that is higher than the required temperature during the steelmaking process. The way to increase the tapping temperature can be to reduce the addition ratio of scrap or increase the addition ratio of hot metal.

[0029] (3) During the tapping alloying process, according to the internal control target composition of the alloy for the steel grade to be smelted, calculate and add an appropriate amount of pig iron pellets to partially replace ferrosilicon manganese alloy and coke breeze carburizer through the following steps to increase the manganese and carbon contents in the molten steel, thereby reducing the usage amounts of ferrosilicon manganese alloy and coke breeze carburizer and lowering the production cost:

[0030] ① According to the actual tapping surplus temperature of the converter or refining furnace, determine the addition amount of pig iron pellets according to the standard of adding 1t of pig iron pellets for every 10°C, and then set the working parameters of the vibrating feeder in the bin to feed the pig iron pellets into the ladle of the converter or refining furnace.

[0031] ② Calculate the reference increased contents of manganese and carbon in the molten steel after the manganese and carbon in the high-manganese pig iron enter the molten steel through the alloying process according to the contents (mass percentages) of manganese and carbon in the high-manganese pig iron raw materials and the recovery rates of manganese and carbon in the high-manganese pig iron during the tapping alloying process: Reference increased content = mass of added pig iron pellets * content of element in high-manganese pig iron * recovery rate of element / single-tap steel output.

[0032] ③ According to the target composition contents (mass percentages) a1 and a2 of manganese and carbon in the alloy of the steel grade to be smelted, the residual contents (mass percentages) b1 and b2 of manganese and carbon in the molten steel at the end of smelting, and the calculated reference increased contents c1 and c2 of manganese and carbon in the high-manganese pig iron, calculate the manganese d1 that still needs to be supplemented by adding ferrosilicon manganese alloy and the carbon d2 that needs to be supplemented by adding coke breeze carburizer: d1 = a1 - b1 - c1, d2 = a2 - b2 - c2, and add the corresponding ferrosilicon manganese alloy and coke breeze carburizer to the ladle of the converter or refining furnace according to d1 and d2.

[0033] Further, the mass of ferrosilicon-manganese alloy that still needs to be added during the alloying process determined according to d1 = tapping weight per heat of the converter or refining furnace * d1 / 65% / 85%, where 65% is the manganese content in the ferrosilicon-manganese alloy, and 85% is the recovery rate of manganese in the ferrosilicon-manganese alloy during the tapping alloying process;

[0034] The mass of coke breeze carburizer that still needs to be added during the alloying process determined according to d2 = tapping weight per heat of the converter or refining furnace * d2 / 82% / 85%, where 82% is the carbon content in the coke breeze carburizer, and 85% is the recovery rate of carbon in the coke breeze carburizer during the tapping alloying process.

[0035] Further, the mass of ferrosilicon-manganese alloy replaced by the added pig iron pellets = mass of the added pig iron pellets * manganese element content in high-manganese pig iron / 65%, where 65% is the manganese content in the ferrosilicon-manganese alloy;

[0036] The mass of coke breeze carburizer replaced by the added pig iron pellets = mass of the added pig iron pellets * carbon element content in high-manganese pig iron / 82%, where 82% is the carbon content in the coke breeze carburizer.

[0037] Taking the tapping weight per heat of the converter being 130 tons and 2 tons of high-manganese pig iron with a manganese content of 9.9175% added per heat as an example to illustrate the calculation process of the reference increased content of manganese element and the mass of ferrosilicon-manganese alloy replaced by high-manganese pig iron (the calculation method of the reference increased content of carbon and the mass of coke breeze carburizer replaced is the same and will not be elaborated):

[0038] The reference increased content of manganese after entering the molten steel during the alloying process = 2 * 1000 * 9.9175% * 85% / 130 / 1000 = 0.0013 = 0.13%;

[0039] The mass of ferrosilicon-manganese alloy replaced = 2 * 1000 * 9.9175% / 65% = 305.15 kg.

[0040] The size of general ordinary high manganese pig iron raw materials is above 150mm * 150mm, and it does not meet the conditions for feeding on an alloy belt. Therefore, in conventional use, high manganese pig iron is directly added to the converter or refining furnace as scrap steel, which will cause great waste of manganese elements. Crushing the high manganese pig iron raw material is the most important step in the method of the present invention, which can provide the premise and guarantee for subsequent industrialized batch use: By using the method of the present invention, according to the actual situation of the production operation plan, combined with the internal control composition and temperature of the steel grade alloy, during the alloying process of tapping from the converter or refining furnace, the ratio of manganese-based alloys can be reduced and the alloy substitution work can be organized in a planned manner. It can be continuously organized for substitution in multiple batches, and can be accurately measured and precisely substituted. The crushed high manganese pig iron can replace the manganese in silico-manganese alloy and the carbon in coke breeze carburizer when tapping from the converter or refining furnace, and can be directly added to the ladle in the form of an alloy and melted into the molten steel, enabling the high manganese pig iron raw material to be 100% converted into molten steel, thereby reducing the blowing loss caused by directly putting high manganese pig iron into the converter or refining furnace for smelting and becoming steel slag (generally there will be a 10% oxidation blowing loss), while the high manganese pig iron after crushing and then used does not have this part of the loss.

[0041] Preferably, the raw material selects high manganese pig iron with a manganese content greater than 10% and certain utilization value, and the cost reduction effect is better when substituting manganese elements.

[0042] Furthermore, as shown in the following table, the chemical composition of the high manganese pig iron used includes: C≥3.5%, Si≤1.25%, Mn≥10%, P≤0.250%, S≤0.07%.

[0043]

[0044] Furthermore, the average recovery rates of each conventional element of high manganese pig iron during the alloying process of tapping are obtained according to the actual measurement data of large-scale production as follows:

[0045] C: 85%, Mn: 85%, Si: 80%, S: 100%, P: 100%.

[0046] Furthermore, the recovery rates of both manganese and carbon in high manganese pig iron during the alloying process of tapping are 85%.

[0047] Furthermore, when adding pig iron pellets to the converter or refining furnace, according to the specific situation, the vibration feeder can be used to control the addition of pig iron pellets to the ladle in batches, which can meet the requirements of front-of-furnace operations and can accurately measure the feeding amount to achieve precise substitution.

[0048] Furthermore, when adding pig iron pellets, if the actual tapping surplus temperature is much higher than the expected surplus temperature value, the work of the vibration feeder can be controlled to replenish the material again to achieve the purpose of precise control and maximizing the single-furnace utilization amount of crushed high manganese pig iron.

[0049] Example 1

[0050] The industrialized usage method for substituting high-manganese pig iron after crushing for converter steelmaking alloys to reduce costs provided in this example specifically includes:

[0051] (1) Crushing and feeding high-manganese pig iron raw materials onto the belt: Use a grab machine to feed the high-manganese pig iron raw materials into a 2000-type jaw crusher. After the crusher operates, crush the high-manganese pig iron with dimensions above 150mm * 150mm (such as 200mm * 200mm * 100mm) into pig iron particles with a particle size of 10mm - 70mm. Then transport the pig iron particles to the low-level bin of the steel mill by truck, and through the operation of belts F1, F2, F3, and F4, feed the pig iron particles into the medium-level and high-level alloy bins of the converter;

[0052] (2) Before converter smelting, plan the addition amount of high-manganese pig iron within the range of 1 - 3t, and adjust the charging amounts of hot metal and scrap according to the surplus temperature increase of 10°C corresponding to each 1t addition of high-manganese pig iron, and increase the tapping temperature to make the expected tapping temperature meet the temperature requirement for melting the added high-manganese pig iron;

[0053] (3) During the alloying process of converter tapping, according to the internal control target composition of the alloy for the steel grade to be smelted, calculate and add an appropriate amount of pig iron particles to partially replace ferrosilicon manganese alloy and coke breeze carburizer through the following steps to increase the manganese and carbon contents in the molten steel, thereby reducing the usage amounts of ferrosilicon manganese alloy and coke breeze carburizer and lowering the production cost:

[0054] ① Determine the surplus tapping temperature of 20°C based on the actual tapping temperature of the converter, and add 2 tons of pig iron particles;

[0055] ② The conventional elements in high-manganese pig iron include manganese, silicon, sulfur, phosphorus, and carbon. The contents, recovery rates, and reference increased contents of each conventional element in the high-manganese pig iron raw materials (calculated as 2 tons) used in this example are shown in Table 1:

[0056] Table 1 Contents of each conventional element in the high-manganese pig iron used in Example 1, and their recovery rates and reference increased contents during the alloying process of converter tapping

[0057] Element Content kg Recovery rate % Reference increased content % Manganese 198.35 85％ 0.130％ Silicon 6.58 80％ 0.004％ Sulfur 0.25 100％ 0.000％ Phosphorus 6.83 100％ 0.005％ Carbon 90.55 85％ 0.059％

[0058] ③ According to the target composition contents (mass percentages) a1 and a2 of manganese and carbon in the alloy for the steel grade to be smelted, the residual contents (mass percentages) b1 and b2 of manganese and carbon in the molten steel at the end of converter smelting, and the calculated reference increased contents c1 and c2 of manganese and carbon in the high-manganese pig iron, calculate the manganese d1 that still needs to be supplemented by adding ferrosilicon manganese alloy and the carbon d2 that needs to be supplemented by adding coke breeze carburizer: d1 = a1 - b1 - c1, d2 = a2 - b2 - c2;

[0059] Furthermore, the mass of ferrosilicon-manganese alloy that still needs to be added during the alloying process is determined based on d1 = tapping volume per converter heat * d1 / 65% / 85%, and the mass of coke breeze carburizer that still needs to be added during the alloying process is determined based on d2 = tapping volume per converter heat * d2 / 82% / 85%.

[0060] In this embodiment, the mass of ferrosilicon-manganese alloy replaced by the added pig iron pellets is 305.15 kg, and the mass of coke breeze carburizer replaced is 110.43 kg. The cost reduction effect obtained based on the alloy substitution results is shown in Table 2:

[0061] Table 2 Cost reduction effect of alloying substitution using high-manganese pig iron

[0062]

[0063]

[0064] In this embodiment, based on a tapping volume of 130 tons per heat and a per-heat ratio of 2000 kg, it is estimated that approximately 305 kg of ferrosilicon-manganese alloy and approximately 110 kg of coke breeze carburizer can be substituted. At the same time, the blowing loss during converter smelting can be reduced by 10%, the cost can be saved by approximately 1580 yuan per heat, and the alloy cost per ton of steel can be reduced by 12.16 yuan.

[0065] Example 2

[0066] In this embodiment, the method provided by the present invention is applied to the refining furnace steel melting. The crushed high-manganese pig iron enters the alloy bin of the 3# LF furnace through belt feeding, with a vibrating quantity of 1781 kg, and is all added into one heat of molten steel; alloy substitution is carried out using the crushed high-manganese pig iron, and the cost reduction effect is shown in Tables 3 - 4:

[0067] The return phosphorus of the molten steel is 0.009%, the increased manganese is 0.16%, and the increased carbon is 0.037%, which is equivalent to saving 439.04 kg of ferrosilicon-manganese alloy and 81.3 kg of coke breeze carburizer; the alloy cost per ton of steel is reduced by 12.73 yuan, the cost of coke breeze carburizer per ton of steel is reduced by 0.72 yuan, the blowing loss is reduced and the efficiency is increased by 1.62 yuan per ton. After excluding the crushing processing cost of 1.15 yuan, the cost per ton of steel per heat is reduced by 13.92 yuan, and the cost reduction effect is remarkable.

[0068] Table 3 Reference increased content of high-manganese pig iron used in Example 2 and cost reduction effect of alloying substitution

[0069]

[0070] Table 4 Cost that can be reduced by using 1 ton of high-manganese pig iron in Example 2

[0071]

[0072]

[0073] In the prior art, the usage method is either to add it into a converter or a refining furnace, and the manganese element is wasted due to oxidation, or to add it into a ladle in the form of a grab machine or a ton bag. The usage efficiency is low, not precise enough, and the true value of the manganese element cannot be truly exploited. In the present invention, ordinary high-manganese pig iron is crushed, with the particle size requirement of 10 - 70 mm, fed into the converter or refining furnace bin through a low-position bin belt conveyor, and then the precisely crushed high-manganese pig iron is added into the ladle through a vibrating feeder, and then some alloys are supplemented to meet the requirements of the steel grade composition. This process achieves batch usage and precise usage, effectively reducing the oxidation blow loss of pig iron in the converter or refining furnace, improving the effective recovery of the manganese element, and at the same time, carbon is also effectively utilized, realizing the concept of cost reduction and green low-carbon environmental protection.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An industrial use method for crushing high manganese pig iron to replace it with steelmaking alloys and reduce costs, characterized in that, Specifically include: (1) Crushing and belt feeding of high manganese pig iron raw materials: The high manganese pig iron raw materials are fed to the jaw crusher by a grabber. After the crusher is running, the high manganese pig iron with a size of 150mm*150mm is crushed into pig iron particles with a particle size of 10mm-70mm; the pig iron particles are then transported to the low-level silo of the steelmaking plant, and fed into the alloy silo through the operation of various levels of belts; (2) Before smelting, the amount of high manganese pig iron added is planned within the range of 1-3 tons, and the surplus temperature is increased by 10°C for every 1 ton of high manganese pig iron added, and the amount of molten iron and scrap steel charged is adjusted to increase the tapping temperature so that the expected tapping temperature meets the temperature requirement for melting the added high manganese pig iron; (3) During the alloying process of steel, according to the internal control target composition of the alloy of the smelting steel grade, the following steps are used to calculate and add an appropriate amount of pig iron particles to partially replace the silicon-manganese alloy and coke carburizer to increase the manganese and carbon content in the molten steel: ① According to the actual excess temperature of steel tapping, the amount of pig iron pellets to be added is determined according to the standard of adding 1 t of pig iron pellets for every 10°C, and then the working parameters of the vibrating feeder in the silo are set to feed the pig iron pellets into the ladle; ② According to the manganese and carbon content in the high manganese pig iron raw material and the recovery rate of manganese and carbon in the high manganese pig iron during the alloying process of steel tapping, calculate the reference increase content of manganese and carbon in the high manganese pig iron after entering the molten steel through the alloying process: reference increase content = mass of pig iron particles added * content of elements in high manganese pig iron * recovery rate of elements / steel tapping amount of a single furnace; ③ According to the target composition contents a1 and a2 of manganese and carbon in the smelting steel alloy, the residual contents b1 and b2 of manganese and carbon in the molten steel at the end of smelting, and the calculated reference increase contents c1 and c2 of manganese and carbon in high manganese pig iron, calculate the manganese d1 that needs to be supplemented by adding silicon manganese alloy and the carbon d2 that needs to be supplemented by adding butane coke recarburizer: d1=a1-b1-c1, d2=a2-b2-c2, and add the corresponding silicon manganese alloy and butane coke recarburizer into the ladle according to d1 and d2.

2. The industrial use method of crushing high manganese pig iron for steelmaking alloy substitution to reduce costs according to claim 1, characterized in that, The raw material is high manganese pig iron with a manganese content greater than 10%.

3. The industrial use method of breaking high manganese pig iron for steelmaking alloy substitution to reduce costs according to claim 1, characterized in that According to d1, the mass of silicon-manganese alloy that needs to be added in the alloying process = single furnace steel output * d1 / 65% / 85%, 65% is the manganese content in the silicon-manganese alloy, and 85% is the recovery rate of manganese in the silicon-manganese alloy during the steel alloying process; According to d2, the mass of the butane carburizer that needs to be added in the alloying process is determined = the amount of steel produced by a single furnace * d2 / 82% / 85%, 82% is the carbon content in the butane carburizer, and 85% is the recovery rate of carbon in the butane carburizer during the steel alloying process.

4. The industrial use method of crushing high manganese pig iron for steelmaking alloy substitution to reduce costs according to claim 1, characterized in that, The mass of silicon-manganese alloy replaced by the added pig iron particles = the mass of the added pig iron particles * the content of manganese in the high manganese pig iron / 65%, 65% is the content of manganese in the silicon-manganese alloy; The mass of the coke butane carburizer replaced by the added pig iron particles = the mass of the added pig iron particles * the carbon content in the high manganese pig iron / 82%, 82% is the carbon content in the coke butane carburizer.

5. The industrial use method of crushing high manganese pig iron for steelmaking alloy substitution to reduce costs according to claim 1, characterized in that, The chemical composition of the high manganese pig iron used includes: C≥3.5%, Si≤1.25%, Mn≥10%, P≤0.250%, S≤0.07%.

6. The industrial use method for replacing with broken high manganese pig iron for steelmaking alloy to reduce costs according to claim 1, characterized in that The recovery rates of manganese and carbon in high manganese pig iron during the ladle alloying process are both 85%.

7. The industrial use method for replacing steelmaking alloys by crushing high manganese pig iron to reduce costs according to claim 1, characterized in that, The addition of pig iron particles into the ladle is controlled in batches by a vibrating feeder.

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