A preparation process of low-carbon high-silicon silicon-manganese alloy

Abstract

The invention discloses a preparation process of a low-carbon high-silicon silicon-manganese alloy, comprising the following steps: (1) accurately proportioning blue carbon, silica, and electrolytic manganese metal, and mixing the prepared raw materials to ensure uniform distribution of each component; (2) gradually adding the uniformly mixed raw materials into a submerged arc furnace through a feeding device, starting the submerged arc furnace, heating up, and completing the smelting of the low-carbon high-silicon silicon-manganese alloy at high temperature to obtain an alloy liquid; (3) discharging the alloy liquid through a slag separation device, and then slowly discharging the alloy liquid out of the furnace, into a casting mold, and cooling to form a low-carbon high-silicon silicon-manganese alloy ingot; (4) finishing the alloy ingot, crushing, packaging, and warehousing, and completing the preparation of the low-carbon high-silicon silicon-manganese alloy. The low-carbon high-silicon silicon-manganese alloy prepared by the invention has a silicon content of ≥72%, a manganese content of ≥22%, an iron content of <2.3%, and a carbon content of <0.08%, and can be used for the refining of high-end low-micro carbon ferromanganese.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical engineering, and in particular to a preparation process of a low-carbon high-silicon silicon-manganese alloy. Background Art

[0002] With the continuous development of the steel industry and the continuous advancement of technology, low-carbon, high-silicon silicon-manganese alloy, as an important alloy additive and deoxidizer, is increasingly widely used in the metallurgical industry. Its excellent physical properties and unique chemical properties make it play an important role in improving the quality of steel products and reducing production costs. In the composition ratio of traditional silicon-manganese alloys, the manganese content is usually between 60% and 85%, and the silicon content is between 10% and 30%. Although this alloy can meet the manufacturing needs of general steel, in some special application scenarios, such as high-strength low-alloy steel and corrosion-resistant steel, higher requirements are placed on the content of silicon and manganese. Especially for steels that require extremely low carbon content, traditional silicon-manganese alloys are prone to bring in excessive carbon during the smelting process, affecting the performance of the steel. Therefore, it is necessary to develop a silicon-manganese alloy with extremely low carbon content for the refining of high-end low-micro carbon ferromanganese. Summary of the invention

[0003] Based on the problems existing in the background technology, the present invention provides a preparation process of a low-carbon, high-silicon silicon-manganese alloy. The low-carbon, high-silicon silicon-manganese alloy prepared by the present invention has a silicon content ≥72%, a manganese content ≥22%, an iron content <2.3%, and a carbon content <0.08%, and can be used for the refining of high-end low-micro-carbon ferromanganese.

[0004] The present invention is implemented by the following technical solutions:

[0005] A preparation process of a low-carbon high-silicon silicon-manganese alloy comprises the following steps:

[0006] (1) Precisely proportion the semi-coke, silica and electrolytic manganese metal, and mix the prepared raw materials to ensure that the components are evenly distributed;

[0007] (2) gradually adding the uniformly mixed raw materials into the submerged arc furnace through a feeding device, starting the submerged arc furnace, raising the temperature, and completing the smelting of the low-carbon high-silicon silicon-manganese alloy at high temperature to obtain an alloy liquid;

[0008] (3) The alloy liquid is discharged through a slag separation device, and then the alloy liquid is slowly discharged out of the furnace and enters a casting mold, and after cooling, a low-carbon high-silicon silicon-manganese alloy ingot is formed;

[0009] (4) The alloy ingots are finely processed, crushed, packaged and stored to complete the preparation of low-carbon, high-silicon silicon-manganese alloy.

[0010] Furthermore, in step (1), the mass ratio of blue carbon, silica and electrolytic manganese metal is 1: (1.74-1.86): (0.26-0.35).

[0011] Furthermore, in step (1), SiO 2 The content of electrolytic manganese metal is ≥98%, and the content of Mn in electrolytic manganese metal is ≥99%.

[0012] Furthermore, in step (2), the temperature of the electric arc furnace is raised to 1600-1800° C., and the smelting time is 10-20 min.

[0013] Furthermore, the silicon-manganese alloy finishing scraps produced in the finishing process in step (4) are reused as raw materials for the batching in step (1).

[0014] Furthermore, the silicon content of the low-carbon high-silicon silicon-manganese alloy after finishing in step (4) is ≥72%, and the manganese content is ≥22%.

[0015] Furthermore, the iron content of the low-carbon high-silicon silicon-manganese alloy after finishing in step (4) is less than 2.3%, and the carbon content is less than 0.08%.

[0016] Furthermore, the smelting of low carbon high silicon silicon manganese alloy at high temperature includes:

[0017] High-precision temperature sensors are set at multiple points on the wall of the ore-heating furnace where the raw materials are evenly mixed; high-precision temperature sensors are set at multiple points to monitor the temperature of the multiple points of the raw material furnace wall contacting the raw material smelting part that contacts the ore-heating furnace wall; during the heating process, the temperature of the multiple points of the raw material furnace wall contacting part quickly reaches the set raw material smelting heating temperature, and the heat transfer heating process time for the heating process to reach the set raw material smelting temperature is recorded; according to the heat transfer heating process time, the heat transfer heating process time difference is compensated, and the compensation smelting time is precisely adjusted; the raw materials are evenly mixed at high temperature. During the smelting process, in addition to monitoring the heating temperature in the ore-heating furnace, the thermal imaging temperature of the raw materials themselves during the smelting process in the ore-heating furnace is monitored through thermal imaging technology; according to the thermal imaging temperature of the raw materials themselves and the temperature of the multi-point distributed raw material furnace wall contact part, the ore-heating furnace is used to adjust the heating in different areas, so that the thermal imaging temperature of the raw materials themselves can evenly reach the set smelting temperature, and the temperature difference of the multi-point distributed raw material furnace wall contact part temperature at each point does not exceed the set maximum raw material furnace wall contact part temperature difference, so as to keep the temperature distribution of the smelting process uniform and stable; the low-carbon high-silicon silicon-manganese alloy smelting can be carried out uniformly and stably.

[0018] Furthermore, the feeding device includes: a multi-point feeding port, a reaction monitor, a balanced reaction intelligent feeding module and a feeding control and adjustment module; the multi-point feeding port performs multi-point feeding of raw materials through multiple feeding ports; the reaction monitor monitors the smelting reaction temperature and smelting reaction state in the ore furnace in real time; the balanced reaction intelligent feeding module intelligently analyzes the smelting reaction temperature and smelting reaction state according to the smelting reaction temperature and smelting reaction state to see whether there is an abnormal reaction in the smelting process, and obtains the intelligent analysis information of the abnormal reaction in the smelting process; the intelligent analysis of whether the smelting reaction temperature and smelting reaction state show an abnormal reaction in the smelting process includes: intelligent analysis The smelting reaction temperature and smelting reaction state determine whether there is an abnormal state of excessive local reaction that leads to excessive local temperature and unstable molten pool, whether there is a reaction splashing state, whether there is insufficient local reaction or whether incompletely reduced residue is formed; the feeding control and adjustment module automatically controls and adjusts the feeding speed and feeding point position of multiple feeding ports based on the intelligent analysis information of the smelting process reaction abnormalities, maintains the balanced reaction of each reaction point in the smelting process, adjusts the balance to eliminate excessive or insufficient raw material accumulation at each feeding point, maintains the uniformity and stability of the reaction in the furnace, and improves the accuracy of the alloy component ratio and the quality of the alloy synthesis ratio.

[0019] Beneficial effects of the present invention:

[0020] Silicon is a powerful deoxidizer in steel smelting. By increasing the silicon content in the alloy, oxygen impurities in the steel can be removed more effectively, pores and inclusions in the steel can be reduced, thereby improving the purity and toughness of the steel. This is particularly important for the production of high-quality steel, especially in steel grades that require extremely low impurities. The silicon content in the low-carbon, high-silicon silicon-manganese alloy prepared by the present invention is ≥72%. Increasing the silicon content can enhance the reduction ability of the alloy, which is beneficial to steel grades that need to reduce residual elements (such as carbon, phosphorus, etc.) in the steel. In particular, when producing ultra-low carbon steel or ultra-clean steel, silicon-manganese alloys with high silicon content can provide a stronger reduction effect. In the context of increasingly tight ore resources, reasonable adjustment of the silicon and manganese content can make better use of existing resources. By reducing dependence on manganese ore, dependence on imported raw materials can be reduced, and the self-sufficiency rate and utilization rate of domestic resources can be improved.

[0021] The present invention uses high-purity electrolytic manganese metal, which does not contain carbon impurities in several steps, and controls the carbon content from the source; the reducing agent blue coke used has a relatively low carbon content, which also helps to reduce the carbon content introduced during the smelting process. In the present invention, the addition of blue coke is controlled by precise batching, so that it can not only meet the amount of carbon required for silica reduction, but also avoid excessive carbon from dissolving into the alloy during the smelting process, resulting in excessive carbon content. In the present invention, the carbon content is controlled below 0.08%, which can reduce the precipitation of carbides in the alloy and reduce the catalytic tendency of grain boundaries, thereby improving the toughness and plasticity of the material and reducing the risk of brittle fracture. This is particularly important for engineering materials that require high toughness. The present invention also controls the iron content below 2.3%, reduces the impurity content in the alloy, can further improve the purity and stability of the product, and helps to meet higher-end application requirements.

[0022] The present invention can monitor the heating process by arranging high-precision temperature sensors at multiple points, so that the temperature of the contact parts of the raw material furnace wall distributed at multiple points can quickly reach the set raw material smelting heating temperature; it can compensate for the time difference of the heat transfer heating process according to the time of the heat transfer heating process, and accurately adjust the compensation smelting time; in addition to monitoring the heating temperature in the ore furnace, the thermal imaging temperature of the raw material itself during the raw material smelting process in the ore furnace is monitored by thermal imaging technology; the thermal imaging temperature of the raw material itself is evenly reached to the set smelting temperature through the heating adjustment of the ore furnace in different areas, and the temperature difference of the contact parts of the raw material furnace wall distributed at each point does not exceed the set maximum raw material furnace wall contact part temperature difference, so as to keep the temperature distribution of the smelting process uniform and stable; the present invention adopts a multi-point position balance feeding reaction balance through the feeding device; it can be Raw materials can be added at multiple points through multiple feeding ports; the smelting reaction temperature and smelting reaction state in the electric arc furnace can be monitored in real time; the smelting reaction temperature and smelting reaction state can be intelligently analyzed to see whether there is any abnormal reaction in the smelting process, whether there is any abnormal state of local reaction being too violent, resulting in local temperature being too high and molten pool being unstable, whether there is any reaction splashing, whether there is any local reaction being insufficient, or whether incompletely reduced residue is formed; the feeding speed and feeding point positions of multiple feeding ports can be automatically controlled and adjusted according to the intelligent analysis information of the abnormal reaction in the smelting process, so as to keep the reaction of each reaction point in the smelting process balanced, adjust the balance to eliminate excessive or insufficient raw material accumulation at each feeding point, and significantly improve the reaction uniformity and stability in the furnace, the accuracy of the alloy component ratio, and the quality of the alloy synthesis ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide further explanation of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1This is a diagram showing an embodiment of a preparation process of a low-carbon, high-silicon silicon-manganese alloy according to the present invention.

[0025] Figure 2 This is a diagram showing an embodiment of a feeding device for a preparation process of a low-carbon, high-silicon silicon-manganese alloy according to the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0027] Example 1

[0028] A preparation process of a low-carbon high-silicon silicon-manganese alloy comprises the following steps:

[0029] (1) Precisely mix semi-coke, silica and electrolytic manganese metal in a mass ratio of 1:1.8:0.3, and mix the prepared raw materials to ensure uniform distribution of each component;

[0030] (2) gradually adding the uniformly mixed raw materials into the submerged arc furnace through a feeding device, starting the submerged arc furnace, heating it to 1700°C, smelting it for 15 minutes, and completing the smelting of the low-carbon high-silicon silicon-manganese alloy at high temperature to obtain an alloy liquid;

[0031] (3) The alloy liquid is discharged through a slag separation device, and then the alloy liquid is slowly discharged out of the furnace and enters a casting mold, and after cooling, a low-carbon high-silicon silicon-manganese alloy ingot is formed;

[0032] (4) The alloy ingots are finely processed, crushed, packaged and stored to complete the preparation of low-carbon, high-silicon silicon-manganese alloy.

[0033] The low-carbon, high-silicon silicon-manganese alloy prepared by the method of this embodiment has a silicon mass fraction of 73%, a manganese mass fraction of 23%, an iron mass fraction of 2.0%, and a carbon mass fraction of 0.06%.

[0034] Example 2

[0035] A preparation process of a low-carbon high-silicon silicon-manganese alloy comprises the following steps:

[0036] (1) Precisely batch blue carbon, silica and electrolytic manganese metal according to a mass ratio of 1:1.74:0.33, and mix the prepared raw materials to ensure that the components are evenly distributed;

[0037] (2) gradually adding the uniformly mixed raw materials into the submerged arc furnace through a feeding device, starting the submerged arc furnace, heating it to 1700°C, smelting it for 15 minutes, and completing the smelting of the low-carbon high-silicon silicon-manganese alloy at high temperature to obtain an alloy liquid;

[0038] (3) The alloy liquid is discharged through a slag separation device, and then the alloy liquid is slowly discharged out of the furnace and enters a casting mold, and after cooling, a low-carbon high-silicon silicon-manganese alloy ingot is formed;

[0039] (4) The alloy ingots are finely processed, crushed, packaged and stored to complete the preparation of low-carbon, high-silicon silicon-manganese alloy.

[0040] The low-carbon, high-silicon silicon-manganese alloy prepared by the method of this embodiment has a silicon mass fraction of 72%, a manganese mass fraction of 24%, an iron mass fraction of 2.1%, and a carbon mass fraction of 0.07%.

[0041] Example 3

[0042] A preparation process of a low-carbon high-silicon silicon-manganese alloy comprises the following steps:

[0043] (1) Precisely batch blue carbon, silica and electrolytic manganese metal according to the mass ratio of 1:1.86:0.28, and mix the prepared raw materials to ensure that the components are evenly distributed;

[0044] (2) gradually adding the uniformly mixed raw materials into the submerged arc furnace through a feeding device, starting the submerged arc furnace, heating it to 1700°C, smelting it for 15 minutes, and completing the smelting of the low-carbon high-silicon silicon-manganese alloy at high temperature to obtain an alloy liquid;

[0045] (3) The alloy liquid is discharged through a slag separation device, and then the alloy liquid is slowly discharged out of the furnace and enters a casting mold, and after cooling, a low-carbon high-silicon silicon-manganese alloy ingot is formed;

[0046] (4) The alloy ingots are finely processed, crushed, packaged and stored to complete the preparation of low-carbon, high-silicon silicon-manganese alloy.

[0047] The low-carbon, high-silicon silicon-manganese alloy prepared by the method of this embodiment has a silicon mass fraction of 74%, a manganese mass fraction of 22%, an iron mass fraction of 2.0%, and a carbon mass fraction of 0.06%.

[0048] Embodiment 4, completing the smelting of low carbon high silicon silicon manganese alloy at high temperature comprises:

[0049] High-precision temperature sensors are set at multiple points on the wall of the ore-heating furnace where the raw materials are evenly mixed; high-precision temperature sensors are set at multiple points to monitor the temperature of the multiple points of the raw material furnace wall contacting the raw material smelting part that contacts the ore-heating furnace wall; during the heating process, the temperature of the multiple points of the raw material furnace wall contacting part quickly reaches the set raw material smelting heating temperature, and the heat transfer heating process time for the heating process to reach the set raw material smelting temperature is recorded; according to the heat transfer heating process time, the heat transfer heating process time difference is compensated, and the compensation smelting time is precisely adjusted; the raw materials are evenly mixed at high temperature. During the smelting process, in addition to monitoring the heating temperature in the ore-heating furnace, the thermal imaging temperature of the raw materials themselves during the smelting process in the ore-heating furnace is monitored through thermal imaging technology; according to the thermal imaging temperature of the raw materials themselves and the temperature of the multi-point distributed raw material furnace wall contact part, the ore-heating furnace is used to adjust the heating in different areas, so that the thermal imaging temperature of the raw materials themselves can evenly reach the set smelting temperature, and the temperature difference of the multi-point distributed raw material furnace wall contact part temperature at each point does not exceed the set maximum raw material furnace wall contact part temperature difference, so as to keep the temperature distribution of the smelting process uniform and stable; the low-carbon high-silicon silicon-manganese alloy smelting can be carried out uniformly and stably.

[0050] Example 4 Principle and effect: During the smelting process, the fluctuation of the furnace temperature may affect the reduction reaction efficiency of silicon dioxide; if the temperature is too low, SiO 2 The reduction rate will slow down, resulting in prolonged reaction time, which in turn affects the output and alloy quality; if the temperature is too high, the reaction may be too violent, increasing the loss of the furnace lining and affecting the composition stability of the alloy; the present invention uses high-precision temperature sensors and thermal imaging technology to monitor the temperature distribution of different areas in the furnace in real time to ensure that the temperature of each area remains within a reasonable range and avoid local overheating or overcooling; then introduce an automated temperature control system to automatically adjust the current or heating power according to the temperature changes in the furnace to ensure that the temperature during the reaction is controlled within the set range and reduce the impact of temperature fluctuations on the reaction rate; high-precision temperature sensors are set at multiple points to monitor the temperature rise During the heating process, the temperature of the multi-point distributed raw material furnace wall contact parts can quickly reach the set raw material smelting heating temperature; it can compensate for the time difference of the heat transfer heating process according to the heat transfer heating process time, and accurately adjust the compensation smelting time; in addition to monitoring the heating temperature in the electric arc furnace, the thermal imaging temperature of the raw materials themselves during the raw material smelting process in the electric arc furnace is monitored through thermal imaging technology; through the regional heating adjustment of the electric arc furnace, the thermal imaging temperature of the raw material itself can be evenly reached to the set smelting temperature, and the temperature difference of the multi-point distributed raw material furnace wall contact parts at each point distributed raw material furnace wall contact parts does not exceed the set maximum raw material furnace wall contact part temperature difference, so as to keep the temperature distribution of the smelting process uniform and stable.

[0051] Embodiment 5, the feeding device includes: a multi-point feeding port 51, a reaction monitor 52, a balanced reaction intelligent feeding module 53 and a feeding control and adjustment module 54; the multi-point feeding port performs multi-point feeding of raw materials through multiple feeding ports; the reaction monitor monitors the smelting reaction temperature and smelting reaction state in the ore furnace in real time; the balanced reaction intelligent feeding module intelligently analyzes the smelting reaction temperature and smelting reaction state according to the smelting reaction temperature and smelting reaction state to see whether the smelting process reaction is abnormal, and obtains the smelting process reaction abnormality intelligent analysis information; the intelligent analysis of whether the smelting reaction temperature and smelting reaction state show abnormal smelting process reaction includes: Intelligently analyze the smelting reaction temperature and smelting reaction state to see whether there is an excessively violent local reaction resulting in excessively high local temperature and abnormal unstable molten pool state, whether there is a reaction splashing state, whether there is insufficient local reaction or whether incompletely reduced residue is formed; the feeding control and adjustment module automatically controls and adjusts the feeding speed and feeding point position of multiple feeding ports according to the intelligent analysis information of the smelting process reaction abnormality, maintains the balanced reaction of each reaction point in the smelting process, adjusts the balance to eliminate excessive or insufficient raw material accumulation at each feeding point, maintains the uniformity and stability of the reaction in the furnace, and improves the accuracy of the alloy component ratio and the quality of the alloy synthesis ratio.

[0052] The principle and effect of Example 5 are as follows: large-scale reduction of silica may cause excessive or insufficient local reaction, thereby affecting the stability of the entire smelting process; for example, if the local reaction is too intense, it will cause the local temperature to be too high, the molten pool to be unstable, and even splashing may occur; if the local reaction is insufficient, an incompletely reduced residue will be formed, affecting the composition and purity of the final alloy; multi-point feeding technology is adopted in the smelting process, that is, raw materials are added at different feeding ports at the same time; this method can effectively avoid excessive or insufficient accumulation of raw materials at a certain position, thereby maintaining the uniformity and stability of the reaction in the furnace; an intelligent feeding system is used to automatically adjust the feeding speed and the position of the feeding point by real-time monitoring of the temperature and reaction conditions in the furnace to ensure balanced reactions in various parts; the present invention adopts a multi-point position balanced feeding reaction through a feeding device Balance; multiple feeding ports can be used to feed raw materials at multiple points; the smelting reaction temperature and smelting reaction state in the ore-fired furnace can be monitored in real time; the smelting reaction temperature and smelting reaction state can be intelligently analyzed to see if there is any abnormal reaction in the smelting process, whether there is any abnormal state of excessive local reaction resulting in excessive local temperature and unstable molten pool, whether there is any reaction splashing, whether there is any insufficient local reaction or whether incompletely reduced residue is formed, and the feeding speed and feeding point position of multiple feeding ports can be automatically controlled and adjusted according to the intelligent analysis information of the abnormal reaction in the smelting process to keep the reaction of each reaction point in the smelting process balanced, and the balance can be adjusted to eliminate excessive or insufficient raw material accumulation at each feeding point, so as to significantly improve the reaction uniformity and stability in the furnace, the accuracy of the alloy component ratio and the quality of the alloy synthesis ratio.

[0053] Finally, it should be noted that the above-mentioned embodiments only express several implementation methods of the present invention and are not intended to limit the invention. For those skilled in the art, any modification, equivalent replacement, improvement, etc. made without departing from the concept of the present invention should be included in the protection scope of the invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A process for preparing a low-carbon high-silicon silicon-manganese alloy, characterized in that: The following steps are involved: (1) Precisely proportion the semi-coke, silica and electrolytic manganese metal, and mix the prepared raw materials to ensure that the components are evenly distributed; (2) gradually adding the uniformly mixed raw materials into the submerged arc furnace through a feeding device, starting the submerged arc furnace, raising the temperature, and completing the smelting of the low-carbon high-silicon silicon-manganese alloy at high temperature to obtain an alloy liquid; (3) The alloy liquid is discharged through a slag separation device, and then the alloy liquid is slowly discharged out of the furnace and enters a casting mold, and after cooling, a low-carbon high-silicon silicon-manganese alloy ingot is formed; (4) Finishing the alloy ingots, crushing, packaging and warehousing to complete the preparation of low-carbon, high-silicon silicon-manganese alloy; In step (1), the mass ratio of blue carbon, silica and electrolytic manganese metal is 1: (1.74-1.86): (0.26-0.35); The feeding device includes: a multi-point feeding port, a reaction monitor, a balanced reaction intelligent feeding module and a feeding control and adjustment module; the multi-point feeding port performs multi-point feeding of raw materials through multiple feeding ports; the reaction monitor monitors the smelting reaction temperature and smelting reaction state in the ore furnace in real time; the balanced reaction intelligent feeding module intelligently analyzes the smelting reaction temperature and smelting reaction state according to the smelting reaction temperature and smelting reaction state to see if there is any abnormal reaction in the smelting process, and obtains the intelligent analysis information of the abnormal reaction in the smelting process; the intelligent analysis of the smelting reaction temperature and smelting reaction state to see if there is any abnormal reaction in the smelting process includes: intelligent analysis of the smelting reaction The temperature and smelting reaction state should be checked to see whether there is excessive local reaction resulting in excessive local temperature and abnormal unstable molten pool state, whether there is reaction splashing state, whether there is insufficient local reaction or whether incompletely reduced residue is formed; the feeding control and adjustment module automatically controls and adjusts the feeding speed and feeding point position of multiple feeding ports according to the intelligent analysis information of abnormal reactions in the smelting process, so as to keep the reaction balance of each reaction point in the smelting process, adjust the balance to eliminate excessive or insufficient raw material accumulation at each feeding point, maintain the uniformity and stability of the reaction in the furnace, and improve the accuracy of the alloy component ratio and the quality of the alloy synthesis ratio.

2. The preparation process according to claim 1, characterized in that: In step (1), the SiO2 content in the silica is ≥98%, and the Mn content in the electrolytic manganese metal is ≥99%.

3. The preparation process according to claim 1, characterized in that: In step (2), the temperature of the electric arc furnace is raised to 1600-1800° C., and the smelting time is 10-20 minutes.

4. The preparation process according to claim 1, characterized in that: The silicon-manganese alloy finishing scraps produced in the finishing process in step (4) are used again as raw materials for the batching in step (1).

5. The preparation process according to claim 1, characterized in that: The silicon content of the low-carbon high-silicon silicon-manganese alloy after finishing in step (4) is ≥72%, and the manganese content is ≥22%.

6. The preparation process according to claim 1, characterized in that: The iron content of the low-carbon high-silicon silicon-manganese alloy after finishing in step (4) is less than 2.3%, and the carbon content is less than 0.08%.

7. The preparation process according to claim 1, characterized in that: The smelting of low carbon high silicon silicon manganese alloy at high temperature includes: High-precision temperature sensors are set at multiple points on the wall of the ore-heating furnace where the raw materials are evenly mixed; high-precision temperature sensors are set at multiple points to monitor the temperature of the multiple points of the raw material furnace wall contacting the raw material smelting part that contacts the ore-heating furnace wall; during the heating process, the temperature of the multiple points of the raw material furnace wall contacting part quickly reaches the set raw material smelting heating temperature, and the heat transfer heating process time for the heating process to reach the set raw material smelting temperature is recorded; according to the heat transfer heating process time, the heat transfer heating process time difference is compensated, and the compensation smelting time is precisely adjusted; the raw materials are evenly mixed at high temperature. During the smelting process, in addition to monitoring the heating temperature in the ore-heating furnace, the thermal imaging temperature of the raw materials themselves during the smelting process in the ore-heating furnace is monitored through thermal imaging technology; according to the thermal imaging temperature of the raw materials themselves and the temperature of the multi-point distributed raw material furnace wall contact part, the ore-heating furnace is used to adjust the heating in different areas, so that the thermal imaging temperature of the raw materials themselves can evenly reach the set smelting temperature, and the temperature difference of the multi-point distributed raw material furnace wall contact part temperature at each point does not exceed the set maximum raw material furnace wall contact part temperature difference, so as to keep the temperature distribution of the smelting process uniform and stable; the low-carbon high-silicon silicon-manganese alloy smelting can be carried out uniformly and stably.

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