Nitrogen removal agent for low-nitrogen metal manganese ingot production and preparation method thereof

Abstract

The invention discloses a nitrogen removal agent for low-nitrogen metal manganese ingot production and a preparation method thereof, relates to the technical field of metal material processing, and aims to solve the problems that in the current low-nitrogen metal manganese ingot processing process, the nitrogen content in a metal manganese ingot is increased, and the nitrogen removal effect is poor due to the fact that the low-nitrogen metal manganese ingot and nitrogen in the environment are easily subjected to a combination reaction. The silicon nitride slag remover comprises a reducing agent and a slag remover, the reducing agent reacts with nitrogen in air to generate a new nitride when the liquid manganese water is heated to 1300 DEG C or above, and the slag remover can adsorb silicon nitride on the surface of the manganese water and form a protective film on the surface of the manganese water. According to the nitrogen removal agent and the production process thereof, the nitrogen content in the metal manganese ingot can be remarkably reduced, a dual-action mechanism is adopted, it is ensured that the nitrogen content of the metal manganese ingot is effectively controlled in the whole production process, and therefore the quality of the metal manganese ingot is improved; therefore, the requirements on low-nitrogen metal manganese ingots in the industries of steel, nonferrous metals and the like can be better met.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material processing, and more specifically to a denitrifying agent for producing low-nitrogen metal manganese ingots and a preparation method thereof. Background Art

[0002] Manganese metal is widely used in the industrial field, especially in the steel, nonferrous metals and other industries. In the processing links such as smelting, casting and cooling of manganese metal, manganese metal is very easy to react with nitrogen in the environment, resulting in an increase in the nitrogen content in the manganese metal ingot. High nitrogen content will have a serious negative impact on the performance of manganese metal ingots, such as reducing its toughness and increasing its brittleness, thereby affecting its use effect and life in subsequent applications.

[0003] Traditional processing methods are difficult to effectively control this nitrogen increase process. Therefore, it is of great practical significance to develop a method that can effectively reduce the nitrogen content of metal manganese ingots during the production process. In view of this, we propose a denitrifier for the production of low-nitrogen metal manganese ingots and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a denitrifying agent for the production of low-nitrogen manganese metal ingots and a preparation method thereof, so as to solve the technical problem that the low-nitrogen manganese metal ingots are very likely to react chemically with nitrogen in the environment during the current processing, resulting in an increase in the nitrogen content in the manganese metal ingots, which has a serious negative impact on the performance of the manganese metal ingots.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a denitrifying agent for producing low-nitrogen manganese metal ingots, comprising a reducing agent and a deslagging agent;

[0006] The reducing agent density is 2-4 g / cm 3 , the melting point is 1400°C, the slag remover has low density, good adsorption and high temperature resistance, and the reducing agent reacts with nitrogen in the air to generate new nitrides when the liquid manganese water is heated to above 1300°C;

[0007] The deslagging agent can adsorb silicon nitride on the surface of the manganese water and form a protective film on the surface of the manganese water to prevent nitrogen from increasing due to contact between the manganese water and the air.

[0008] Preferably, the reaction between the reducing agent and nitrogen in the air is carried out at the interface formed between the manganese water and the air, so as to reduce the direct contact and combination between nitrogen in the air and the manganese water.

[0009] Preferably, the slag remover can adsorb silicon nitride on the surface of manganese water and form a protective film on the surface of manganese water. The protective film can effectively block the manganese water from contacting the air again, prevent manganese and nitrogen from combining again, and ensure the low-nitrogen quality of the metallic manganese ingot.

[0010] The denitrification agent and its production process of the present invention can significantly reduce the nitrogen content in the metal manganese ingot. During the smelting process, the reducing agent reacts with nitrogen in the air to reduce the amount of nitrogen entering the manganese water, and the deslagging agent adsorbs silicon nitride and forms a protective film to prevent subsequent air from contacting the manganese water and increasing nitrogen. This dual action mechanism ensures that the nitrogen content of the metal manganese ingot is effectively controlled throughout the production process, thereby improving the quality of the metal manganese ingot, so that it can better meet the demand for low-nitrogen metal manganese ingots in the steel, non-ferrous metals and other industries.

[0011] Preferably, a method for producing a low-nitrogen manganese metal ingot comprises the following steps:

[0012] S1: smelting stage;

[0013] Put the metal raw materials (97-98% manganese + 2-3% iron) into the medium frequency furnace. Before putting them in, strictly inspect the metal raw materials to ensure that the composition is accurate and free of impurities;

[0014] S2: slag removal agent addition stage;

[0015] After the liquid manganese water is formed, the prepared deslagging agent is added to the manganese water according to the predetermined addition amount and addition method. After the deslagging agent is added;

[0016] S3: reducing agent action stage;

[0017] Add the reducing agent. As the smelting continues, the reducing agent in the liquid manganese water begins to work. At the new interface formed between the manganese water and the air, the reducing agent's temperature rises under the action of the heat of the manganese water. When the temperature reaches above 1300°C, closely monitor the reaction of the reducing agent with nitrogen in the air, analyze the gas composition and reaction rate produced by the reaction, and judge the reaction effect of the reducing agent.

[0018] At the same time, ensure that the reducing agent can continuously and effectively reduce the contact between nitrogen in the air and manganese water during the entire reaction process. If abnormal reactions are found, such as too slow reaction rates or other side reactions, the performance of the reducing agent or process parameters need to be adjusted;

[0019] S4: molding stage;

[0020] After the reaction between the reducing agent and nitrogen and the adsorption of the slag remover on silicon nitride are completed, the liquid manganese water is injected into the pre-designed mold through a suitable pouring system. At the same time, the mold is properly preheated to prevent the liquid manganese water from solidifying unevenly due to a sudden drop in temperature during the injection process;

[0021] S5: cooling stage;

[0022] After the casting is completed, the manganese water begins to cool in the mold. Choose the appropriate cooling method. Too fast cooling rate will cause stress concentration inside the metal manganese ingot and cracks, while too slow cooling rate will affect production efficiency. By real-time monitoring of the temperature change of the metal manganese ingot, the cooling parameters are accurately adjusted to ensure that the metal manganese ingot can be evenly and stably cooled to room temperature;

[0023] S6: slag removal stage;

[0024] After cooling, a slag layer with silicon nitride adsorbed on the surface of the metal manganese ingot will be attached. Use appropriate slag removal methods. During the slag removal process, pay attention to avoid damaging the metal manganese ingot body and ensure that the slag layer is cleaned to avoid affecting the quality of the metal manganese ingot.

[0025] S7: fragmentation stage;

[0026] After slag removal, the manganese ingots need to be crushed to meet the requirements of different production links for the size of the manganese ingots. Crushing equipment is selected for crushing. After crushing, the crushed manganese ingot particles are screened to ensure that the final low-nitrogen manganese ingot product quality is uniform and stable.

[0027] Preferably, the metal is smelted in the medium frequency furnace by coreless induction smelting. During the smelting process, it is necessary to pay close attention to the melting state of the metal, including the melting speed and melting uniformity. The smelting process is reasonably adjusted according to the parameters of the medium frequency furnace to ensure that the metal is completely melted to form stable liquid manganese water.

[0028] Preferably, after the liquid manganese water is formed, a slag remover is added thereto. The amount of slag remover added is accurately calculated based on the total amount of manganese water, the initial nitrogen content and the performance of the slag remover. The addition method can be batch or continuous to ensure that the slag remover is evenly dispersed in the manganese water. At the same time, the changes on the surface of the manganese water are observed. If there is any abnormality, the addition strategy is adjusted in time.

[0029] Preferably, during mold casting, liquid manganese water is injected into the mold through a pouring system, the pouring speed and temperature are controlled, and the mold needs to be preheated to ensure that the liquid manganese water evenly fills the mold cavity.

[0030] Preferably, the cooling method can be a combination of one or more of natural cooling, air cooling, and water cooling. The cooling rate can be controlled according to the size, shape, and material properties of the metal manganese ingot. The cooling parameters can be adjusted by real-time monitoring of temperature changes to ensure that the metal manganese ingot is evenly and stably cooled to room temperature.

[0031] Preferably, the slag removal method can be one or a combination of mechanical scraping and high-pressure water washing to remove the slag layer of silicon nitride adsorbed on the surface of the metal manganese ingot, avoid damaging the metal manganese ingot body, and ensure that the slag layer is cleanly removed.

[0032] Preferably, the crushing equipment can be one of a jaw crusher and a cone crusher or a combination of the two. The crushing parameters are adjusted according to the hardness and toughness of the metal manganese ingot. After crushing, the particles are screened to remove particles that do not meet the size requirements.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The denitrification agent and its production process of the present invention can significantly reduce the nitrogen content in the metal manganese ingot. During the smelting process, the reducing agent reduces the amount of nitrogen entering the manganese water by reacting with nitrogen in the air, and the deslagging agent adsorbs silicon nitride and forms a protective film to prevent subsequent air from contacting the manganese water and increasing nitrogen. This dual action mechanism ensures that the nitrogen content of the metal manganese ingot is effectively controlled throughout the production process, thereby improving the quality of the metal manganese ingot, so that it can better meet the demand for low-nitrogen metal manganese ingots in the steel, non-ferrous metals and other industries.

[0035] 2. Due to the reduction of nitrogen content, the performance of metal manganese ingots has been significantly improved. Metal manganese ingots with low nitrogen content have better toughness and reduce the brittleness problem caused by high nitrogen. This makes metal manganese ingots less likely to have defects such as cracks during subsequent processing and use, and improves the reliability and service life of the product. For example, when low-nitrogen metal manganese ingots are used in steel production, they can enhance the strength and toughness of steel products, improve the quality of steel products, and reduce quality risks caused by high nitrogen content in metal manganese ingots.

[0036] 3. The denitrification agent and production process involved in the present invention have high stability and controllability. In the preparation process of the denitrification agent, the stability of the quality of the denitrification agent is ensured by accurately controlling the performance parameters of the reducing agent and the deslagging agent. In the production process of low-nitrogen manganese ingots, there are clear operating parameters and control methods for each link from smelting, adding deslagging agent, reducing agent reaction to mold casting, cooling, deslagging and crushing. This allows the entire production process to be carried out stably according to the set parameters, and the operator can effectively monitor and adjust the production process, reduce product quality problems caused by process fluctuations, and improve production efficiency and product qualification rate.

[0037] 4. By effectively controlling the nitrogen content of the metal manganese ingot, the scrap rate of the metal manganese ingot caused by high nitrogen content is reduced. In the traditional production method, the metal manganese ingot with high nitrogen content may not meet the quality requirements and be discarded, resulting in a waste of resources. The application of the present invention can reduce this waste phenomenon and improve the utilization rate of raw materials. At the same time, the stable production process also reduces the energy and time consumed by repeated processing or adjustment due to unstable process, further improves the efficiency of resource utilization and reduces production costs.

[0038] 5. Reducing the nitrogen content of metal manganese ingots also has environmental significance to a certain extent. Metal manganese ingots with high nitrogen content may release nitrogen-related pollutants during subsequent use or treatment, while the low-nitrogen metal manganese ingots produced by the present invention reduce this potential pollution risk. In addition, the stable production process reduces the generation of waste in the production process, thereby reducing the pressure of waste treatment on the environment, which is beneficial to environmental protection and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The present invention is a production flow chart of low nitrogen manganese metal ingots. DETAILED DESCRIPTION

[0040] like Figure 1 As shown, the present invention relates to a denitrifying agent for producing low-nitrogen metal manganese ingots, including a reducing agent and a deslagging agent;

[0041] The reducing agent density is 2-4 g / cm 3 , the melting point is 1400°C, the deslagging agent has low density, good adsorption and high temperature resistance, the reducing agent reacts with nitrogen in the air to generate new nitride when the liquid manganese water is heated to above 1300°C, the deslagging agent can adsorb silicon nitride on the surface of the manganese water and form a protective film on the surface of the manganese water to prevent the increase of nitrogen caused by the contact between the manganese water and the air.

[0042] In an embodiment of the present invention, the reducing agent reacts with nitrogen in the air at the interface formed between manganese water and air to reduce the direct contact and combination of nitrogen in the air with manganese water. In terms of raw material selection, the preparation of the reducing agent should comprehensively consider the chemical properties, purity and stability of the source of the raw materials. It can be screened and combined from a variety of metal compounds or single substances with reducing ability, such as certain metal oxides and carbides. In the preparation process, the reducing agent that meets the requirements is synthesized by accurately controlling the chemical reaction conditions. These conditions include but are not limited to temperature, pressure, reaction time and the ratio of reactants. An organic combination of various process steps such as high-temperature smelting, chemical precipitation, and crystallization can be used. In the high-temperature smelting process, it is necessary to use specific furnace equipment to heat the raw materials to a suitable temperature range according to a predetermined heating curve and keep them at this temperature for a certain time to ensure that the reaction is fully carried out. The chemical precipitation process requires precise control of factors such as the amount of precipitant added and the pH of the reaction environment. The synthesized reducing agent needs to undergo strict quality testing, including measuring its density using a densitometer, determining its melting point using a thermal analysis method, and evaluating its reducing ability through a specially designed reduction performance test experiment. Only when all performance indicators meet the range specified in the present invention (density 2-4g / cm 3The reducing agent can only be considered successfully prepared when the reducing agent has a melting point of about 1400°C. If the performance of the reducing agent is found to be unsatisfactory during the test, such as a large density deviation or a melting point that is too high or too low, the synthesis process needs to be carefully analyzed and adjusted, and the preparation needs to be repeated.

[0043] In an embodiment of the present invention, the slag remover can adsorb silicon nitride on the surface of manganese water and form a protective film on the surface of manganese water, and the protective film can effectively prevent manganese water from contacting the air again, prevent manganese and nitrogen from combining again, and ensure the low nitrogen quality of the metal manganese ingot. The preparation of the slag remover must first carefully select raw materials with suitable properties, and these raw materials should have key characteristics such as low density, good adsorption, and high temperature resistance. It can be selected from a variety of materials, such as mineral materials with porous structures (such as diatomaceous earth), special ceramic materials (such as high-temperature ceramic fibers), or specially treated organic materials. In the preparation process, the raw materials must first be pretreated, including operations such as crushing and screening. The crushing operation can use equipment such as ball mills and crushers to crush the raw materials into suitable particle sizes, and the screening is to remove oversized or undersized particles through screens of different meshes to ensure the particle size uniformity and purity of the raw materials. Then, the pretreated raw materials are processed by a series of conventional processes such as mixing, grinding, and sintering. In the mixing process, if necessary, some auxiliary agents can be added to enhance the adsorption performance or stability of the slag remover. For example, an appropriate amount of surfactant can be added to improve the adsorption capacity of the slag remover for silicon nitride by changing the physical and chemical properties of the surface of the slag remover. The grinding process requires the use of special grinding equipment, such as a sand mill, to grind the mixed materials to a suitable particle size to ensure that the slag remover can be evenly dispersed in the manganese water. After high-temperature treatment such as sintering, the prepared slag remover needs to undergo comprehensive performance testing. Density measurement can be performed using conventional density measuring instruments, adsorption performance tests can be performed by simulating experiments on the adsorption of silicon nitride on the surface of manganese water, and high-temperature resistance tests can be performed in a high-temperature furnace to simulate the high-temperature environment in the production process of manganese water. Only when the slag remover shows good performance in these performance tests (low density, effective adsorption of silicon nitride, and stability at high temperatures) can it meet the nitrogen removal requirements in the production process of low-nitrogen metal manganese ingots.

[0044] The denitrification agent and its production process of the present invention can significantly reduce the nitrogen content in the metal manganese ingot. During the smelting process, the reducing agent reacts with nitrogen in the air to reduce the amount of nitrogen entering the manganese water, and the deslagging agent adsorbs silicon nitride and forms a protective film to prevent subsequent air from contacting the manganese water and increasing nitrogen. This dual action mechanism ensures that the nitrogen content of the metal manganese ingot is effectively controlled throughout the production process, thereby improving the quality of the metal manganese ingot, so that it can better meet the demand for low-nitrogen metal manganese ingots in the steel, non-ferrous metals and other industries.

[0045] As another embodiment of the present invention, a method for producing a low-nitrogen manganese metal ingot comprises the following steps:

[0046] S1, smelting stage;

[0047] During the smelting stage, the metal raw materials (97-98% manganese + 2-3% iron) must first be strictly inspected for quality to ensure that their composition is accurate and free of impurities. Chemical analysis methods (such as spectral analysis) can be used to analyze the composition of the metal raw materials, and possible impurities such as rust and other metal debris can be removed by visual inspection, magnetic separation and other methods. The qualified metal raw materials are carefully placed in the medium frequency furnace (coreless induction). After starting the medium frequency furnace, the metal raw materials are gradually heated up by coreless induction heating. In this process, pay close attention to the working parameters of the medium frequency furnace, such as power, frequency, etc., and observe the melting state of the metal at the same time. The melting speed and melting uniformity of the metal are monitored in real time through equipment such as observation windows or temperature sensors. According to these monitoring results, the parameters such as the power and heating time of the medium frequency furnace are adjusted in time to ensure that the metal can be completely melted and form a stable and uniform liquid manganese water. For example, if it is found that the melting speed is too fast, it may cause local overheating. At this time, the power of the medium frequency furnace can be appropriately reduced; if the melting is uneven, the heating time can be appropriately extended or the magnetic field distribution in the furnace can be adjusted;

[0048] S2, slag removal agent addition stage;

[0049] When liquid manganese water is formed, add the prepared deslagging agent to the manganese water according to the pre-calculated addition amount. The calculation of the addition amount needs to comprehensively consider factors such as the total volume of the manganese water, the initial nitrogen content, and the adsorption capacity of the deslagging agent. The appropriate addition amount can be determined by establishing a mathematical model or according to an empirical formula. The addition method can be batch addition, that is, the deslagging agent is divided into several small portions and added to the manganese water in sequence at a certain time interval; it can also be continuous addition, using a special addition equipment (such as a screw feeder) to add the deslagging agent to the manganese water at a constant speed. Regardless of the addition method, it is necessary to ensure that the deslagging agent can be evenly dispersed in the manganese water. After adding the deslagging agent, carefully observe the changes on the surface of the manganese water. The adsorption of silicon nitride can be checked with the naked eye or with the help of equipment such as an optical microscope to ensure that the silicon nitride on the surface of the manganese water is effectively adsorbed. At the same time, observe the distribution state of the deslagging agent in the manganese water to avoid the situation where the deslagging agent is aggregated or partially uncovered. If abnormal conditions are found, such as silicon nitride is not adsorbed in some areas or the deslagging agent is unevenly distributed, it is necessary to adjust the parameters such as the addition amount, addition speed or addition method in time;

[0050] S3, reducing agent action stage;

[0051] During the smelting process, the reducing agent in the liquid manganese water begins to form a new interface between the manganese water and the air. As the heat of the liquid manganese water is transferred, the temperature of the reducing agent gradually increases. When the temperature reaches above 1300°C, the reducing agent reacts chemically with the nitrogen in the air. In this process, the reaction must be fully monitored. A gas analyzer can be used to analyze the gas produced by the reaction in real time to determine the composition and content of the nitrides therein, so as to judge the reaction between the reducing agent and nitrogen. At the same time, the reaction rate is evaluated by measuring the temperature change in the reaction area and observing the dynamic changes of the reaction interface. If the reaction rate is found to be too slow, it may be caused by insufficient activity of the reducing agent or insufficient contact with the air. At this time, you can consider replacing the reducing agent or adjusting the process parameters, such as increasing the distribution area of ​​the reducing agent on the surface of the manganese water and improving the ventilation conditions of the smelting environment. If other side reactions or abnormal phenomena occur, such as the generation of black smoke and abnormal odors, the smelting process needs to be stopped immediately, the reducing agent and the entire process need to be inspected and analyzed, the problem needs to be found out and corresponding solutions need to be taken;

[0052] S4, molding stage;

[0053] After the reaction of the reducing agent with nitrogen and the adsorption of silicon nitride by the slag remover are completed, the liquid manganese water is injected into the mold through the pouring system. The design of the pouring system should ensure that the liquid manganese water can flow into the mold cavity smoothly and evenly. Different pouring methods such as bottom pouring, middle pouring or top pouring can be used, and the most suitable pouring method can be selected according to the shape and size of the metal manganese ingot. During the pouring process, the pouring speed and pouring temperature must be strictly controlled. If the pouring speed is too fast, the liquid manganese water may impact the mold cavity wall, resulting in defects such as pores and inclusions; if the pouring speed is too slow, the liquid manganese water may solidify prematurely during the pouring process, affecting the molding quality of the metal manganese ingot. If the pouring temperature is too high, the mold may be damaged, and the risk of shrinkage, cracks and other defects of the metal manganese ingot may be increased; if the pouring temperature is too low, the liquid manganese water will have poor fluidity and cannot fill the mold cavity. Therefore, it is necessary to determine the optimal pouring speed and pouring temperature range through experiments and experience based on factors such as the composition of the manganese water, the material and size of the mold. In addition, the mold needs to be preheated before use. The preheating temperature should be determined according to the pouring temperature of the manganese water and the material of the mold, generally between 200-500℃. Preheating can be done by resistance heating, gas heating, etc. The purpose is to reduce the temperature difference between the liquid manganese water and the mold, and prevent the liquid manganese water from solidifying unevenly and sticking to the mold due to the sudden drop in temperature when it is injected into the mold;

[0054] S5, cooling stage;

[0055] After the casting is completed, the manganese water begins to cool in the mold. The choice of cooling method is crucial to the quality of manganese ingots. Natural cooling is suitable for the production of small manganese ingots with low cooling rate requirements; air cooling can adjust the cooling rate by controlling the wind speed and wind direction, which is suitable for medium-sized manganese ingots; water cooling has the characteristics of fast cooling speed, but it is necessary to accurately control the time and temperature of water cooling to avoid excessive thermal stress. It is usually used for large manganese ingots or situations with high production efficiency requirements. In actual production, a combination of multiple cooling methods can also be used according to the specific situation of the manganese ingot. For example, air cooling is used in the initial cooling stage of the manganese ingot, and natural cooling is used when the temperature of the manganese ingot drops to a certain level. During the cooling process, the temperature change of the manganese ingot should be monitored in real time by a temperature sensor installed in the mold or on the surface of the manganese ingot. According to the temperature change, combined with the size, shape and material properties of the manganese ingot, the cooling parameters such as the wind speed of air cooling, the time and temperature of water cooling are adjusted. By accurately controlling the cooling rate, it is ensured that the manganese ingot can be cooled to room temperature evenly and stably to avoid defects such as internal stress and cracks caused by uneven cooling.

[0056] S6, slag removal stage;

[0057] After cooling is completed, a layer of slag containing silicon nitride will adhere to the surface of the metal manganese ingot. During the slag removal process, it is necessary to select appropriate slag removal tools and methods according to the thickness, hardness and other characteristics of the slag layer. For thinner slag layers with lower hardness, mechanical scraping can be used, and the slag layer can be gently scraped off using tools such as scrapers and wire brushes. For thicker slag layers with higher hardness or slag layers that are more closely bonded to the surface of the metal manganese ingot, high-pressure water washing can be used. High-pressure water washing can use a special high-pressure water gun to wash away the slag layer from the surface of the metal manganese ingot by adjusting the water pressure and water flow direction. During the slag removal process, pay attention to the strength and direction of the operation to avoid scratches, pits and other damage to the body of the metal manganese ingot. At the same time, to ensure that the slag layer is completely removed, the cleanliness of the surface of the metal manganese ingot can be checked by visual inspection, touch inspection or using equipment such as a surface roughness measuring instrument. If a residual slag layer is found, the slag removal operation needs to be performed again until the surface of the metal manganese ingot is clean;

[0058] S7, crushing stage;

[0059] The manganese ingots after slag removal need to be crushed to meet the requirements of the size of the manganese ingots in different production links. During the crushing process, it is necessary to select appropriate crushing equipment according to the hardness, toughness and other mechanical properties of the manganese ingots. For manganese ingots with higher hardness and lower toughness, a jaw crusher can be selected, which crushes the manganese ingots through the extrusion of two jaw plates. For manganese ingots with moderate hardness and toughness, a cone crusher can be selected, which uses the rotation and extrusion principle of the cone for crushing. After selecting the crushing equipment, the crushing parameters should be reasonably adjusted according to the size and crushing requirements of the manganese ingots. Excessive crushing force may cause the manganese ingots to be over-crushed and produce too much fine powder; too small crushing force will not be able to crush the manganese ingots to the required size. The crushing frequency also needs to be adjusted according to the performance of the equipment and the characteristics of the manganese ingots;

[0060] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A denitrifier for producing low-nitrogen manganese ingots, characterized in that: including reducing agents and deslagging agents; The reducing agent density is 2-4 g / cm 3 , the melting point is 1400°C, the slag remover has low density, good adsorption and high temperature resistance, and the reducing agent reacts with nitrogen in the air to generate new nitrides when the liquid manganese water is heated to above 1300°C; The deslagging agent can adsorb silicon nitride on the surface of manganese water and form a protective film on the surface of manganese water to prevent nitrogen from increasing due to contact between manganese water and air.

2. The denitrifier for producing low-nitrogen manganese ingots according to claim 1, characterized in that: The reaction between the reducing agent and nitrogen in the air is carried out at the interface formed between the manganese water and the air, so as to reduce the direct contact and combination between nitrogen in the air and the manganese water.

3. The denitrifier for producing low-nitrogen manganese ingots according to claim 2, characterized in that: The deslagging agent can adsorb silicon nitride on the surface of manganese water and form a protective film on the surface of manganese water. The protective film can effectively prevent manganese water from contacting the air again, prevent manganese and nitrogen from combining again, and ensure the low-nitrogen quality of the metal manganese ingot.

4. A method for producing a low-nitrogen manganese ingot using the denitrifier for producing a low-nitrogen manganese ingot according to claim 3, characterized in that: The following steps are involved: S1: smelting stage; Put the metal raw materials (97-98% manganese + 2-3% iron) into the medium frequency furnace. Before putting them in, strictly inspect the metal raw materials to ensure that the composition is accurate and free of impurities; S2: slag removal agent addition stage; After the liquid manganese water is formed, the prepared deslagging agent is added to the manganese water according to the predetermined addition amount and addition method. After the deslagging agent is added; S3: reducing agent action stage; Add the reducing agent. As the smelting continues, the reducing agent in the liquid manganese water begins to work. At the new interface formed between the manganese water and the air, the reducing agent's temperature rises under the action of the heat of the manganese water. When the temperature reaches above 1300°C, closely monitor the reaction of the reducing agent with nitrogen in the air, analyze the gas composition and reaction rate produced by the reaction, and judge the reaction effect of the reducing agent. At the same time, ensure that the reducing agent can continuously and effectively reduce the contact between nitrogen in the air and manganese water during the entire reaction process. If abnormal reactions are found, such as too slow reaction rates or other side reactions, the performance of the reducing agent or process parameters need to be adjusted; S4: molding stage; After the reaction between the reducing agent and nitrogen and the adsorption of the slag remover on silicon nitride are completed, the liquid manganese water is injected into the pre-designed mold through a suitable pouring system. At the same time, the mold is properly preheated to prevent the liquid manganese water from solidifying unevenly due to a sudden drop in temperature during the injection process; S5: cooling stage; After the casting is completed, the manganese water begins to cool in the mold. Choose the appropriate cooling method. Too fast cooling rate will cause stress concentration inside the metal manganese ingot and cracks, while too slow cooling rate will affect production efficiency. By real-time monitoring of the temperature change of the metal manganese ingot, the cooling parameters are accurately adjusted to ensure that the metal manganese ingot can be evenly and stably cooled to room temperature; S6: slag removal stage; After cooling, a slag layer with silicon nitride adsorbed on the surface of the metal manganese ingot will be attached. Use appropriate slag removal methods. During the slag removal process, pay attention to avoid damaging the metal manganese ingot body and ensure that the slag layer is cleaned to avoid affecting the quality of the metal manganese ingot. S7: fragmentation stage; After slag removal, the manganese ingots need to be crushed to meet the requirements of different production links for the size of the manganese ingots. Crushing equipment is selected for crushing. After crushing, the crushed manganese ingot particles are screened to ensure that the final low-nitrogen manganese ingot product quality is uniform and stable.

5. The method for producing a low-nitrogen manganese ingot according to claim 4, characterized in that: The smelting method of the metal in the medium frequency furnace is coreless induction smelting. During the smelting process, it is necessary to pay close attention to the melting state of the metal, including the melting speed and melting uniformity. The smelting process is reasonably adjusted according to the parameters of the medium frequency furnace to ensure that the metal is completely melted to form stable liquid manganese water.

6. The method for producing a low-nitrogen manganese ingot according to claim 5, characterized in that: After liquid manganese water is formed, add a slag remover into it. The amount of slag remover added is accurately calculated based on the total amount of manganese water, the initial nitrogen content and the performance of the slag remover. The addition method can be batch or continuous to ensure that the slag remover is evenly dispersed in the manganese water. At the same time, observe the changes on the surface of the manganese water and adjust the addition strategy in time if there is any abnormality.

7. The method for producing a low-nitrogen manganese ingot according to claim 6, characterized in that: During mold casting, liquid manganese water is injected into the mold through the pouring system, and the pouring speed and temperature are controlled. The mold needs to be preheated to ensure that the liquid manganese water evenly fills the mold cavity.

8. The method for producing a low-nitrogen manganese ingot according to claim 7, characterized in that: The cooling method can be a combination of one or more of natural cooling, air cooling, and water cooling. The cooling rate can be controlled according to the size, shape, and material properties of the metal manganese ingot. The cooling parameters can be adjusted by real-time monitoring of temperature changes to ensure that the metal manganese ingot is evenly and stably cooled to room temperature.

9. The method for producing a low-nitrogen manganese metal ingot according to claim 8, characterized in that: The slag removal method can be one of mechanical scraping, high-pressure water washing, or a combination of the two to remove the slag layer of silicon nitride adsorbed on the surface of the metal manganese ingot, avoid damaging the metal manganese ingot body, and ensure that the slag layer is removed cleanly.

10. The method for producing a low-nitrogen manganese ingot according to claim 9, characterized in that: The crushing equipment can be one of jaw crusher and cone crusher or a combination of the two. The crushing parameters are adjusted according to the hardness and toughness of the metal manganese ingot. After crushing, the particles are screened to remove the particles that do not meet the size requirements.

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