Novel hydrogen-electricity coupling hydrogen-rich reduction and melt separation integrated smelting process

Abstract

The invention relates to the technical field of smelting equipment, in particular to a novel hydrogen-electricity coupling hydrogen-rich reduction and melt separation integrated smelting process. The method comprises the following steps that A, a hydrogen-based shaft furnace is adopted for producing reduced pellets which are high in metallization ratio and not bonded; b, the reduced pellets obtained in the step A are directly subjected to hot charging and hot conveying to enter a lower high-temperature charging bucket to be stored and carburized; c, carburizing gas is introduced into the middle high-temperature tank, and carburizing operation is conducted through the waste heat of the metallized pellets; and D, the carburized pellets are added into an electromagnetic induction heating system through a spiral distributing device. According to the novel hydrogen-electricity coupling hydrogen-rich reduction and melt separation integrated smelting technology, organic combination of a traditional hydrogen-based shaft furnace technology and a reduction and melt separation electric furnace technology is achieved, the production process of a hydrogen reduction and electric smelting technology is optimally designed, the sealing performance and continuity of production are guaranteed, and the production efficiency is improved. By means of hot charging and hot delivery provided by the technology, efficient utilization of energy and efficient removal of pollutants are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of smelting equipment, and in particular to a new smelting process integrating hydrogen-electricity coupled hydrogen-rich reduction and melting separation. Background Art

[0002] Vanadium, titanium and chromium are recognized as important strategic resources in the world. They are important material guarantees for national economic development and national security, and are widely used in metallurgy, chemical industry, aerospace, national defense and military and other fields. As an important carrier of vanadium, titanium and chromium resources, high-chromium vanadium-titanium magnetite has great comprehensive utilization value. Its reserves in my country are also very abundant. The comprehensive utilization of high-chromium vanadium-titanium magnetite resources has obvious strategic importance. At present, high-chromium vanadium-titanium magnetite is mainly smelted by blast furnace process, with low utilization rate of valuable components and heavy environmental load. In addition, with the intensification of resource consumption, the high-grade iron ore resources available for mining in the world are constantly decreasing, and countries have gradually turned their attention to the comprehensive utilization of iron-containing composite mineral resources. In summary, how to comprehensively utilize high-chromium vanadium-titanium magnetite efficiently and cleanly is of great significance.

[0003] "Basic Research on a New Gas-Based Vertical Furnace Direct Reduction-Smelting Process for High-Chromium Vanadium-Titanium Magnetite", Tang Jue, Northeastern University, published on July 1, 2016, disclosed that the proposed new process achieved theoretical improvement and method innovation for the comprehensive utilization of high-chromium vanadium-titanium magnetite resources, providing an important theoretical basis and reference for the design, development and industrial application of large-scale comprehensive utilization technology of Panzhihua high-chromium vanadium-titanium magnetite, and helping to promote the development of comprehensive utilization technology of high-chromium vanadium-titanium magnetite.

[0004] "Experimental Study on the New Process of Direct Reduction of Vanadium Titanium Magnetite in Gas-based Vertical Furnace and Melting in Electric Furnace", Han Ziwen, Northeastern University, published on 2011-06-01, proposed a new process of direct reduction of vanadium titanium magnetite in gas-based vertical furnace and melting in electric furnace. First, on the basis of determining a reasonable pellet production process, oxidized pellets were prepared with vanadium titanium magnetite as raw material, and their related properties were tested: secondly, the direct reduction experiment of oxidized pellets was carried out to simulate the process conditions of gas-based vertical furnace reduction, and the reduction behavior and reduction expansion performance of the pellets under different reduction temperatures and atmospheres were investigated: finally, the reduced pellets were melted in a high-temperature carbon tube furnace, and compared with the "blast furnace method", the technical feasibility of the new process was investigated.

[0005] "Hydrogen-based Direct Iron Reduction Process Technology and Application", Yu Yue et al., Journal of Iron and Steel Research, Vol. 36, No. 3, March 2024, introduces and analyzes the technical progress, reforming methods and practices of hydrogen-based direct iron reduction process in China, discusses its research status and application at home and abroad, and explains the development prospects of hydrogen-based direct iron reduction in China. By studying the hydrogen-based direct iron reduction process, it provides reference and guidance for the development and transformation of China's steel industry, so as to promote the widespread application and technological innovation of hydrogen-based direct iron reduction process in China, and also provides reference ideas for the sustainable development of other industrial fields;

[0006] The traditional hydrogen-based vertical furnace and the reduction and smelting electric furnace are independent of each other. The hydrogen reduction + electric smelting process first needs to rely on the hydrogen-based vertical furnace to produce direct reduced pellets (DRI), and then transfer the DRI to the electric furnace for reheating and melting. This process covers the cooling and transportation of DRI and the heating and melting process of the electric furnace. The production process is complicated and wastes a lot of energy.

[0007] To this end, a new hydrogen-electricity coupled hydrogen-rich reduction and smelting integrated smelting process is designed to provide another technical solution to the above technical problems. Summary of the invention

[0008] Based on this, it is necessary to provide a new hydrogen-electric coupled hydrogen-rich reduction and smelting integrated smelting process to solve the technical problems raised in the above background technology.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] A new hydrogen-electricity coupled hydrogen-rich reduction and melting-separation integrated smelting process, the steps are as follows:

[0011] A. Use hydrogen-based vertical furnace to produce reduced pellets with high metallization rate and no bonding;

[0012] B. directly hot-loading and hot-transporting the reduced pellets obtained in step A into the lower high-temperature material tank for storage and carburization;

[0013] C. Carburizing gas is introduced into the middle high-temperature tank, and the carburizing operation is performed using the residual heat of the metallized pellets;

[0014] D. Add the carburized pellets into the electromagnetic induction heating system through a spiral distributor, and adjust the melting rate and feeding rate of the induction heating material;

[0015] E. The metallized pellets are quickly melted by electromagnetic induction coil heating, and the melted slag enters the storage device. When the slag reaches a certain capacity, the slag and iron are tapped;

[0016] F. The product obtained in step E is used in subsequent refining and steel rolling processes.

[0017] As a preferred implementation of the new hydrogen-electric coupled hydrogen-rich reduction and smelting integrated smelting process provided by the present invention, the pellet size of the pellets after reduction is 12-16 mm, and the pellet metallization furnace is >90%.

[0018] As a preferred implementation of the novel hydrogen-electric coupled hydrogen-rich reduction and smelting integrated smelting process provided by the present invention, in step B, the reduced pellets obtained in step A are directly hot-charged and hot-transported into the lower high-temperature material tank for storage and carburization, and the steps are as follows:

[0019] The high-temperature gas and materials can enter and exit in an orderly manner by opening and closing the cut-off valve and the upper and lower sealing valves;

[0020] Through radar level meter and sonar level meter, online monitoring of material quantity and material surface shape can be achieved.

[0021] As a preferred embodiment of the novel process for integrated smelting of hydrogen-electric coupled hydrogen-rich reduction and melting provided by the present invention, in step C, carburizing gas is introduced into the intermediate high-temperature tank, and carburizing operation is performed using the waste heat of the metallized pellets, and the steps are as follows:

[0022] Introduce carburizing gas such as natural gas, coke oven gas, coal bed gas, etc. under certain conditions;

[0023] The inlet flow rate is controlled at 70-210Nm 3 / t, to control the carburizing amount of metallized pellets.

[0024] As a preferred implementation mode of the new hydrogen-electricity coupled hydrogen-rich reduction and melting-separation integrated smelting process provided by the present invention, a carburizing control pipeline is added to the high-temperature intermediate tank, specifically a carburizing control valve, which is used to dynamically adjust the carburizing amount.

[0025] As a preferred implementation mode of the new hydrogen-electric coupled hydrogen-rich reduction and melting integrated smelting process provided by the present invention, in step D, the carburized pellets are added to the electromagnetic induction heating system through a spiral distributor, and the high metallization rate pellets are heated by the electromagnetic induction coil to achieve melting of the pellets. The electromagnetic induction heating system adjusts the power supply to adjust the melting rate and feeding rate of the induction heated material.

[0026] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0027] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0028] The present invention provides a new hydrogen-electricity coupled hydrogen-rich reduction and smelting integrated smelting process, which realizes the organic combination of the traditional hydrogen-based vertical furnace and the reduction smelting electric furnace process, optimizes the design of the production process of the hydrogen reduction electric smelting process, ensures the sealing and continuity of the production, and the hot charging and hot transportation proposed in the process realizes the efficient utilization of energy and the efficient removal of pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a process schematic diagram of the present invention;

[0031] Figure 2 For the present invention Figure 1 A partial schematic diagram of the . DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] Reference Figure 1-Figure 2 , a new smelting process integrating hydrogen-electricity coupled hydrogen-rich reduction and melting separation.

[0037] The improved smelting process has the following steps:

[0038] A. Use hydrogen-based vertical furnace to produce reduced pellets with high metallization rate and no bonding, where the pellet size is 12-16mm and the pellet metallization furnace is >90%;

[0039] In this embodiment, the pellet size is controlled within the range of 10-16 mm, the particle size distribution is relatively uniform, the reduction degree is controlled within 90-95%, and the pellet metallization rate is relatively high while the bonding is relatively small. If the bonding of the pellets increases due to the raw material conditions, the method of spraying CaCl2 coating is used to reduce the bonding of the pellets and ensure the dispersion of the pellets after hydrogen-based shaft furnace reduction.

[0040] B. The reduced pellets at about 900℃ are directly hot-charged and hot-transported into the lower high-temperature material tank for storage and carburization; mainly through the device composed of upper and lower sealing valves, material level monitors, material cut-off valves, rectifier pressure control valves, emergency relief valves, carburization control valves and other structures, hot charging and hot transportation are realized and high-temperature and high-pressure operation is guaranteed, ensuring the safety of the process. For details, please refer to Figure 2 ;

[0041] The cut-off valve and the upper and lower sealing valves can be opened and closed to achieve orderly entry and exit of high-temperature gas and materials. The radar level meter is designed as radar system feedback, and the tank filling detection is detected by the sonar level meter, which realizes the online monitoring of the material quantity and material surface shape, laying the foundation for real-time online control of the material quantity in the tank. (Note that the upper and lower sealing valves cannot be opened at the same time. Under the control of the corresponding system program, the lower sealing valve is closed and the upper sealing valve is opened. The pellets fall and reach the set level meter height. Stop feeding, close the cut-off valve and the upper sealing valve. The middle high-temperature tank is currently under high pressure. After the rectifier pressure control valve is used to discharge the pressure, the lower material flow regulating valve and the lower sealing valve are opened, and the lower induction heating system of the DRI material distribution begins to heat and melt).

[0042] C. Carburizing gas is introduced into the middle high-temperature tank, and the waste heat of the metallized pellets is used for carburizing operation. Natural gas, coke oven gas, coalbed methane and other carburizing gases are introduced under certain conditions, and the flow rate is controlled at 70-210Nm 3 / t, which can control the carburizing amount of the metallized pellets, thereby adding a carburizing step in the subsequent hydrogen-based vertical furnace, promoting the formation of Fe3C, and helping to further reduce the melting temperature of the pellets after reduction.

[0043] In this embodiment, a carburizing control pipeline is designed in the high-temperature intermediate tank, specifically a carburizing control valve at the bottom of the intermediate high-temperature tank, which dynamically adjusts the carburizing amount, helps to sense the melting, and realizes dynamic control.

[0044] D. Carburized pellets are added to the electromagnetic induction heating system through a spiral distributor. The high metallization pellets are heated by electromagnetic induction coils in this area to achieve melting of the pellets. The electromagnetic induction heating system adjusts the power supply to adjust the melting rate and feeding rate of the induction heated materials to ensure continuous and stable production of the equipment.

[0045] In this embodiment, the electromagnetic induction heating system mainly includes a power module, a temperature control module, an induction coil group and a heating medium. The working principle of induction heating is to generate an alternating magnetic field through the components of the electronic circuit board. When an iron-containing container is placed on it, the surface of the container cuts the alternating magnetic field lines and generates an alternating current (i.e., eddy current) at the metal part at the bottom of the container. The eddy current causes the carriers at the bottom of the container to move irregularly at high speed, and the carriers collide and rub with atoms to generate heat energy. This has the effect of heating objects and melting metals.

[0046] In this embodiment, the distributor flexibly controls the azimuth angle and circumferential angle to achieve flexible distribution of single-ring spiral fixed-point multiple rings. The distributor valve box is water-cooled and nitrogen-cooled. Through the spiral distributor, the inlet and outlet amounts of the electric melting furnace can be regulated, meeting the matching of the production rates of vertical furnace smelting and electric furnace smelting, and providing continuous, stable, high-quality molten iron for subsequent refining and steel rolling processes.

[0047] E. Through electromagnetic induction coil heating, the metallized pellets are quickly melted, and the melted slag iron enters the storage device. When the slag iron reaches a certain capacity, the slag and iron are discharged.

[0048] F. The product obtained in step E is used in subsequent refining and steel rolling processes.

[0049] This has achieved an organic combination of the traditional hydrogen-based vertical furnace and the reduction smelting furnace technology, realized the online process continuity of direct reduction pelletizing (DRI), and saved energy by hot charging and hot delivery.

[0050] In this embodiment, by adding upper and lower sealing valves and a material flow controller in the transition section between the hydrogen-based vertical furnace and the melting furnace, the influence of induction heating during the melting process on the high temperature and high pressure (900°C, 400Kpa) environment of the hydrogen-rich atmosphere in the hydrogen-based vertical furnace is avoided, thereby ensuring the safety of the production process.

[0051] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A new hydrogen-electric coupled hydrogen-rich reduction and smelting integrated smelting process, characterized in that: Here are the steps: A. Use hydrogen-based vertical furnace to produce reduced pellets with high metallization rate and no bonding; B. directly hot-loading and hot-transporting the reduced pellets obtained in step A into the lower high-temperature material tank for storage and carburization; C. Carburizing gas is introduced into the middle high-temperature tank, and the carburizing operation is performed using the residual heat of the metallized pellets; D. Add the carburized pellets into the electromagnetic induction heating system through a spiral distributor, and adjust the melting rate and feeding rate of the induction heating material; E. The metallized pellets are quickly melted by electromagnetic induction coil heating, and the melted slag enters the storage device. When the slag reaches a certain capacity, the slag and iron are tapped; F. The product obtained in step E is used in subsequent refining and steel rolling processes.

2. According to claim 1, a new hydrogen-electric coupled hydrogen-rich reduction and melting-separation integrated smelting process is characterized in that: The pellet size of the pellets after reduction is 12-16 mm, and the pellet metallization furnace is >90%.

3. According to claim 1, a new hydrogen-electric coupled hydrogen-rich reduction and melting-separation integrated smelting process is characterized in that: In step B, the reduced pellets obtained in step A are directly hot-charged and hot-transported into the lower high-temperature material tank for storage and carburization, and the steps are as follows: The high-temperature gas and materials can enter and exit in an orderly manner by opening and closing the cut-off valve and the upper and lower sealing valves; Through radar level meter and sonar level meter, online monitoring of material quantity and material surface shape can be achieved.

4. According to claim 1, a new hydrogen-electric coupled hydrogen-rich reduction and melting-separation integrated smelting process is characterized in that: In step C, carburizing gas is introduced into the middle high-temperature tank, and the carburizing operation is performed using the residual heat of the metallized pellets. The steps are as follows: Introduce carburizing gas such as natural gas, coke oven gas, coal bed gas, etc. under certain conditions; The inlet flow rate is controlled at 70-210Nm 3 / t, to control the carburizing amount of metallized pellets.

5. A new hydrogen-electric coupled hydrogen-rich reduction and melting-separation integrated smelting process according to claim 4, characterized in that: A carburizing control pipeline is added to the high-temperature intermediate tank, specifically a carburizing control valve, which is used to dynamically adjust the carburizing amount.

6. A new hydrogen-electric coupled hydrogen-rich reduction and melting-separation integrated smelting process as claimed in claim 1, characterized in that: In step D, the carburized pellets are added to the electromagnetic induction heating system through a spiral distributor, and the high metallization rate pellets are heated by the electromagnetic induction coil to achieve melting of the pellets. The electromagnetic induction heating system adjusts the melting rate and feeding rate of the induction heated material by adjusting the power supply.

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