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Advantages and System Characteristics:

a) Iron melt contains a significant amount of reducing elements such as silicon, carbon, and manganese, which results in low burnout and high utilization efficiency of desulfurizers during desulfurization, facilitating the process.

b) The presence of carbon and silicon in iron melt significantly enhances the activity coefficient of sulfur, improving the thermodynamic conditions for desulfurization and enabling the removal of sulfur to a lower level.

c) The low oxygen content in iron melt increases the sulfur distribution coefficient between slag and iron, which is beneficial for desulfurization.

d) The relatively low treatment temperature of iron melt prolongs the lifespan of refractory materials and processing equipment.

e) The cost of desulfurizing iron melt is lower compared to desulfurization in blast furnaces, converters, or secondary refining facilities. For instance, the cost of removing one kilogram of sulfur in a blast furnace, converter, or secondary refining facility is 2.6, 16.9, and 6.1 times higher, respectively, than that in iron melt desulfurization.

f) Changes in iron melt composition during external desulfurization have less impact on the final steel composition compared to changes during steelmaking or secondary steel treatment.

g) Adopting iron melt desulfurization not only reduces the burden on blast furnaces, decreases coke ratio, and improves productivity by reducing slag volume, but also enables converters to operate without the need for high slag volume and high basicity for desulfurization, as desulfurization under the highly oxidative slag conditions in converters is quite challenging. Consequently, iron melt desulfurization has become a crucial means to optimize production processes in modern steel industries, enhancing steel quality and expanding product ranges.

Process Flow:

The iron melt desulfurization system typically comprises an iron melt transportation and tilting system, an injection system (single-injection of particulate magnesium), a slag skimming system, a dust removal system, a material feeding system, and an automatic control system.

Introduction to the Process Model:

The objective of the process model is to ensure smooth operation during the injection process, using the minimum amount of magnesium-based desulfurizer to achieve the target sulfur level. The consumption of magnesium-based desulfurizer is influenced by over a dozen factors. In practical industrial operations, only five primary variables are input into the process model: initial sulfur content in iron melt, initial temperature of iron melt, amount of iron melt to be processed, target sulfur level, and metallic magnesium content in particulate magnesium. Based on these inputs, the process model calculates the magnesium injection rate at different time intervals, the carrier gas flow rate at different time intervals, total magnesium injection time, total consumption of magnesium-based desulfurizer, and stores these values in the computer. Additionally, these values are displayed on an LCD screen. The magnesium injection rate is controlled by adjusting the frequency of the variable-frequency motor driving the rotor feeder via the computer. The carrier gas flow rate is regulated by adjusting the opening of the flow control valve, which is matched with a high-precision flowmeter. For added flexibility in process operation, under automatic mode, the magnesium injection rate, carrier gas flow rate, and initial sulfur content can be manually adjusted. When the magnesium injection rate is manually adjusted, it can be set within 412 kg/min, resulting in a corresponding change in total magnesium injection time. Similarly, when the carrier gas flow rate is manually adjusted within 30170 Nm³/h, it and the total consumption of magnesium-based desulfurizer will vary accordingly.

Automation Control System:

a) The automation control system fully meets all requirements of the process, ensuring reliable operation and leveraging cutting-edge technologies.

b) To accomplish a series of automation tasks, the single-injection particulate magnesium iron melt desulfurization plant adopts a PLC from Siemens.

c) The automation control system of the iron melt desulfurization plant can communicate with other factory control systems (such as the secondary and tertiary systems of the steelmaking system) via its built-in Microsoft SQL Server database.

Wuhan Nanrui Engineering Technology Co., Ltd. is a high-tech enterprise engaged in the research and development, manufacturing, marketing, and technical services of industrial automation, metallurgical complete sets of equipment, system engineering, and continuous casting special measuring instruments. The company's management department is located in Wuhan Donghu High tech Zone, Optics Valley, China, and the production and manufacturing base is located in the adjacent Gedian Economic and Technological Development Zone. At present, we have more than ten patents, copyrights, and software products with independent intellectual property rights. The equipment production plant covers an area of more than 30 acres and has obtained ISO9001:2008 quality system certification; Wuhan University of Science and Technology is a teaching and research practice base with the ability to provide corresponding equipment for the metallurgical industry in terms of production, complete design, and supporting facilities.

Wuhan Nanrui Engineering Technology Co., Ltd. is a high-tech enterprise engaged in the research and development, manufacturing, marketing, and technical services of industrial automation, metallurgical complete sets of equipment, system engineering, and continuous casting special measuring instruments. The company's management department is located in Wuhan Donghu High tech Zone, Optics Valley, China, and the production and manufacturing base is located in the adjacent Gedian Economic and Technological Development Zone. At present, we have more than ten patents, copyrights, and software products with independent intellectual property rights. The equipment production plant covers an area of more than 30 acres and has obtained ISO9001:2008 quality system certification; Wuhan University of Science and Technology is a teaching and research practice base with the ability to provide corresponding equipment for the metallurgical industry in terms of production, complete design, and supporting facilities.

Wuhan Nanrui adheres to the concept of "people-oriented, customer first", and has gathered a team of high-level scientific research and development, production and manufacturing, marketing, and engineering services that are sincere and united. Over the years, with its forward-looking decision-making, strong capabilities, excellent quality, and comprehensive after-sales service, it has established a good corporate image in China. The corporate spirit of dedication, cooperation, and innovation has created Wuhan Nanrui.

Wuhan Nanrui adheres to the concept of "people-oriented, customer first", and has gathered a team of high-level scientific research and development, production and manufacturing, marketing, and engineering services that are sincere and united. Over the years, with its forward-looking decision-making, strong capabilities, excellent quality, and comprehensive after-sales service, it has established a good corporate image in China. The corporate spirit of dedication, cooperation, and innovation has created Wuhan Nanrui.

Wuhan Nanrui Engineering Technology Co., Ltd. is a high-tech enterprise engaged in the research and development, manufacturing, marketing, and technical services of industrial automation, metallurgical complete sets of equipment, system engineering, and continuous casting special measuring instruments. The company mainly produces products such as spray marking machines, deburring machines, blast furnace hot blast stoves, taper gauges, and iron desulfurization. Our management department is located in Wuhan Donghu High tech Zone, Optics Valley, China, and our production and manufacturing base is located in the adjacent Gedian Economic and Technological Development Zone. At present, we have more than ten patents and copyrights with independent intellectual property rights, and have obtained ISO9001:2008 quality system certification; Capable of providing corresponding equipment for the metallurgical industry in terms of production, complete design, and supporting capabilities.

Wuhan Nanrui Engineering Technology Co., Ltd. is a high-tech enterprise engaged in the research and development, manufacturing, marketing, and technical services of industrial automation, metallurgical complete sets of equipment, system engineering, and continuous casting special measuring instruments. The company mainly produces products such as spray marking machines, deburring machines, blast furnace hot blast stoves, taper gauges, and iron desulfurization. Our management department is located in Wuhan Donghu High tech Zone, Optics Valley, China, and our production and manufacturing base is located in the adjacent Gedian Economic and Technological Development Zone. At present, we have more than ten patents and copyrights with independent intellectual property rights, and have obtained ISO9001:2008 quality system certification; Capable of providing corresponding equipment for the metallurgical industry in terms of production, complete design, and supporting capabilities.

Wuhan Nanrui Engineering Technology Co., Ltd. is a high-tech enterprise engaged in the research and development, manufacturing, marketing, and technical services of industrial automation, metallurgical complete sets of equipment, system engineering, and continuous casting special measuring instruments. The company mainly produces products such as spray marking machines, deburring machines, blast furnace hot blast stoves, taper gauges, and iron desulfurization. Our management department is located in Wuhan Donghu High tech Zone, Optics Valley, China, and our production and manufacturing base is located in the adjacent Gedian Economic and Technological Development Zone. At present, we have more than ten patents and copyrights with independent intellectual property rights, and have obtained ISO9001:2008 quality system certification; Capable of providing corresponding equipment for the metallurgical industry in terms of production, complete design, and supporting capabilities.

Wuhan Nanrui Engineering Technology Co., Ltd. is a high-tech enterprise engaged in the research and development, manufacturing, marketing, and technical services of industrial automation, metallurgical complete sets of equipment, system engineering, and continuous casting special measuring instruments. The company mainly produces products such as spray marking machines, deburring machines, blast furnace hot blast stoves, taper gauges, and iron desulfurization. Our management department is located in Wuhan Donghu High tech Zone, Optics Valley, China, and our production and manufacturing base is located in the adjacent Gedian Economic and Technological Development Zone. At present, we have more than ten patents and copyrights with independent intellectual property rights, and have obtained ISO9001:2008 quality system certification; Capable of providing corresponding equipment for the metallurgical industry in terms of production, complete design, and supporting capabilities.

Wuhan Nanrui Company has developed a mature and economically beneficial blast furnace coal injection technology based on its successful experience in large blast furnace coal injection technology; KR molten iron desulfurization and single blowing granular magnesium desulfurization systems have been successfully used in multiple steel mills in China; Wuhan Nanrui has a complete product line of various continuous casting complete sets of equipment, with 17 years of experience in the production and service of continuous casting complete sets of equipment. Its flying hammer continuous casting slab deburring machine has excellent deburring effect and is the pioneer of deburring technology for both the upper and lower end faces of stainless steel slabs; The continuous casting slab arc aluminum wire spray marking machine produced works stably, with clear handwriting, and adopts full process automatic control, running well; The stability, accuracy, and functionality of the taper meter and opening degree detector for slab crystallizers exceed the level of domestic peers, and their products have been widely recognized by domestic slab manufacturers; The environmentally friendly automatic carbon spraying system can achieve full process automatic control and continuous flow adjustment; The intelligent electric furnace bundle oxygen gun and carbon oxygen combustion system can completely replace similar foreign products. Independently developed high-temperature ink wash coating, with smooth and clear printing without clogging the nozzle.

Wuhan Nanrui Company has developed a mature and economically beneficial blast furnace coal injection technology based on its successful experience in large blast furnace coal injection technology; KR molten iron desulfurization and single blowing granular magnesium desulfurization systems have been successfully used in multiple steel mills in China; Wuhan Nanrui has a complete product line of various continuous casting complete sets of equipment, with 17 years of experience in the production and service of continuous casting complete sets of equipment. Its flying hammer continuous casting slab deburring machine has excellent deburring effect and is the pioneer of deburring technology for both the upper and lower end faces of stainless steel slabs; The continuous casting slab arc aluminum wire spray marking machine produced works stably, with clear handwriting, and adopts full process automatic control, running well; The stability, accuracy, and functionality of the taper meter and opening degree detector for slab crystallizers exceed the level of domestic peers, and their products have been widely recognized by domestic slab manufacturers; The environmentally friendly automatic carbon spraying system can achieve full process automatic control and continuous flow adjustment; The intelligent electric furnace bundle oxygen gun and carbon oxygen combustion system can completely replace similar foreign products. Independently developed high-temperature ink wash coating, with smooth and clear printing without clogging the nozzle.

Wuhan Nanrui adheres to the concept of "people-oriented, customer first", and has gathered a team of high-level scientific research and development, production and manufacturing, marketing, and engineering services that are sincere and united. Over the years, with its forward-looking decision-making, strong capabilities, excellent quality, and comprehensive after-sales service, it has established a good corporate image in China. The corporate spirit of dedication, cooperation, and innovation has created Wuhan Nanrui.

Wuhan Nanrui adheres to the concept of "people-oriented, customer first", and has gathered a team of high-level scientific research and development, production and manufacturing, marketing, and engineering services that are sincere and united. Over the years, with its forward-looking decision-making, strong capabilities, excellent quality, and comprehensive after-sales service, it has established a good corporate image in China. The corporate spirit of dedication, cooperation, and innovation has created Wuhan Nanrui.

Wuhan Nanrui adheres to the concept of "people-oriented, customer first", and has gathered a team of high-level scientific research and development, production and manufacturing, marketing, and engineering services that are sincere and united. Over the years, with its forward-looking decision-making, strong capabilities, excellent quality, and comprehensive after-sales service, it has established a good corporate image in China. The corporate spirit of dedication, cooperation, and innovation has created Wuhan Nanrui.