Method and equipment for producing slag powder with different fineness and quality requirements by the same vertical mill

Abstract

The application provides a method for producing slag powder with different fineness and quality requirements by using the same vertical mill, and can produce slag powder with different fineness and quality requirements based on the same crushing equipment. The method is suitable for an internal circulation vertical mill production line, a certain amount of coarse particles is brought into the product according to the production requirement, the fineness and residue of the product can be adjusted under the condition of ensuring the specific surface area of the product, and the purpose of producing products with different fineness and quality requirements is achieved. The application also provides a device for realizing the above method.

Description

Technical Field

[0001] This invention relates to a method for producing slag powder, and more particularly to a method for producing slag powder using a vertical mill, specifically to a method and equipment for producing slag powder with different fineness and quality requirements using the same vertical mill. Background Technology

[0002] The mechanical term (scientific name) for a vertical mill is: roller mill, also known as a vertical mill or grinding mill. It was first used in industrial production in Britain in 1790, and in 1928, the Germans applied vertical mills to the cement industry. my country introduced vertical mills from Germany in 1978, and began research on the localization of vertical mill technology and equipment in 1984, and produced the first prototype for industrial operation.

[0003] A vertical roller mill is a grinding machine that uses the principle of bed grinding to grind materials. It is widely used in industries such as building materials, coal, power, and metallurgy to grind brittle materials into fine powder. Vertical roller mills have high energy utilization, integrating fine crushing, drying, grinding, and powder selection. They offer advantages such as high grinding efficiency, low power consumption, large drying capacity, high product fineness, simple process flow, small footprint, low noise, low metal consumption, and convenient maintenance.

[0004] In the field of building materials production and grinding, vertical mills are becoming increasingly popular due to their superior efficiency. With the advancement of the national zero-waste city initiative, the building materials industry and its downstream industries are increasingly utilizing various industrial solid wastes. In order to fully utilize the performance of industrial solid wastes, the quality requirements for products made from their grinding are becoming higher and finer.

[0005] Cement and slag powder both belong to the building materials industry, and both are experiencing an increasingly refined product quality trend. Currently, the cement industry has introduced the new GB175-2023 standard for "General Portland Cement," which modifies the fineness index of ordinary Portland cement, requiring a sieve residue of no less than 5%. To meet the new standard requirements, cement companies require slag powder to have a sieve residue of no less than 5%, in order to mitigate the impact of varying slag powder blending ratios on the fineness of the cement.

[0006] As a raw material in the building materials industry, slag powder is also widely used in concrete enterprises. Products with lower fineness residue can better meet the needs of commercial concrete. Therefore, slag powder products still need to retain their original fineness quality.

[0007] Against this backdrop, slag powder enterprises need to produce products with different quality requirements to suit their customers and product markets. However, slag powder production is large-scale and equipment costs are high. If they were to purchase new equipment to meet constantly evolving product quality requirements, it would not only delay the production cycle and reduce production efficiency, but also tie up a significant amount of equipment purchase funds and space.

[0008] Therefore, the industry urgently needs a technology that can enable slag powder companies to produce products with different quality requirements in an economical and rapid manner. Summary of the Invention

[0009] This application provides a method for producing slag powder with different fineness requirements using the same vertical mill. This method is applicable to internal circulation vertical mill production lines. An air classifier is located in the upper part of the mill. A short-circuit pipe is added to the outer casing of the air classifier, leading to the outlet air duct, forming a new process. This allows a portion of the internal air to bypass the air classifier and directly enter the mill's outlet air duct, carrying a certain amount of coarse particles into the product, known as customized slag powder, to distinguish it from normal slag powder. A gate valve is installed on the short-circuit pipe. The opening and closing of the gate valve creates different production processes. Controlling the opening degree of the gate valve can adjust the product's sieve residue, achieving the purpose of producing products with different fineness requirements. This method can help cement production customers adapt to the new GB175-2023 "General Portland Cement" standard while meeting existing customer product requirements. It addresses at least one of the aforementioned technical problems based on existing vertical mill products.

[0010] To achieve the above objectives, the technical solution adopted in this application is as follows: A method for producing slag powder with different fineness requirements using the same vertical mill includes the following steps: The first material stream is fed into the classifier of the vertical mill to separate slag powder of different fineness, resulting in the second material stream and the residue stream. Allow the second material stream to enter the outlet pipe; Air carries a portion of the first material flow through a short-circuit pipe into the outlet pipe, where it mixes with the second material flow to form a customized mineral powder product. After completing the production of the customized mineral powder, shut off the short-circuit pipeline and resume normal mineral powder production.

[0011] The first feed stream, consisting of untreated mineral powder semi-finished product containing a certain amount of coarse particles, enters the outlet pipe directly through a short-circuit pipe. This allows it to mix with the screened slag powder, obtaining a product that meets quality requirements, such as a minimum 5% fineness residue on a sieve. In other words, it's possible to introduce coarse mineral powder into the product on the same vertical mill via a short-circuit pipe, adjusting the product to meet new quality requirements without manufacturing or purchasing new equipment. This adaptable approach can accommodate new quality requirements or other downstream fineness requirements for mineral powder products. It can be applied to existing equipment with reasonable technical modifications to implement new processes. Therefore, when producing a product with a higher fineness residue on a sieve in the same vertical mill, this can be achieved by opening the short-circuit pipe. During normal powder production, the short-circuit pipe should be closed. The short-circuit channel must be closed before starting and shutting down the vertical mill.

[0012] In a preferred embodiment, the following steps are also included: Adjust the cross-sectional dimensions of the short-circuit pipe according to the target product quality requirements.

[0013] The cross-sectional dimensions of the short-circuit pipe can be adjusted, with both closed and open adjustment modes. The cross-sectional dimensions can also be adjusted by changing the opening range of the short-circuit pipe, thereby adjusting the amount of coarse particles mixed into the product. This allows it to meet the quality requirements of various products.

[0014] In a preferred embodiment, the cross-sectional dimensions of the short-circuit pipe are adjusted according to the target product quality requirements. This includes screening and separating slag powder of different fineness while opening the short-circuit pipe to the first cross-sectional dimension. After the material flow is uniform and stable, the fineness residue content of the slag powder flowing out of the outlet pipe is detected. If it meets the target product quality requirements, the cross-section of the short-circuit pipe is kept at the first cross-sectional dimension.

[0015] The specific adjustment process can be implemented according to the product situation of the outlet pipeline. If it is determined by calculation or derivation that the size of the short-circuit pipeline needs to be kept at the first cross-sectional size to obtain products that meet the target product quality, then the pipeline should be opened accordingly and production should be carried out. If it does meet the requirements, then production can continue until the output requirements are met.

[0016] In a preferred embodiment, if the condition does not meet the requirements, the short-circuit pipe is adjusted to the second cross-sectional dimension. After the material flow is uniform and stable, the fineness of the slag powder flowing out of the outlet pipe is checked. If the fineness of the slag powder meets the target product quality requirements, the cross-section of the short-circuit pipe is kept at the second cross-sectional dimension; if the condition does not meet the requirements, the cross-sectional dimension of the short-circuit pipe is adjusted again.

[0017] If the first attempt fails, the calculation can be repeated, and the cross-sectional dimensions of the short-circuit pipe can be adjusted to the second cross-sectional dimension. The product quality should be tested again. If it meets the requirements, the open cross-sectional dimension of the short-circuit pipe should be kept at the second cross-sectional dimension. If it does not meet the requirements, continue to adjust according to the above steps.

[0018] In a preferred embodiment, one of the target product quality requirements is to meet the S95 grade mineral powder product quality requirements; the other of the target product quality requirements is to meet the requirement that the fineness sieve residue is not less than 5%.

[0019] In a preferred embodiment, the correlation between different target product quality requirements and the cross-sectional dimensions of the short-circuit pipe is calculated using flow field simulation, and a mapping relationship is formed.

[0020] Before adjusting the cross-sectional dimensions of the short-circuit pipe, a model can be built using flow field simulation techniques, such as Ansysfluent flow field and particle trajectory analysis. This model can then be used to obtain vector and cloud maps of the flow field, as well as particle trajectory maps, for different cross-sectional dimensions of the short-circuit pipe. This simulation method saves on adjustment time and computational load. Subsequent comparative data can be used as feedback to correct the model, thereby improving accuracy. Ultimately, an accurate mapping relationship can be obtained, allowing for the determination of the corresponding cross-sectional dimensions of the short-circuit pipe for different product quality requirements.

[0021] In a preferred embodiment, the correlation between different target product quality requirements and the cross-sectional dimensions of the short-circuit pipe in vertical mills of different specifications is calculated by flow field simulation, and a mapping relationship is formed.

[0022] Another technical solution adopted is a slag powder production equipment to achieve the above method, including... The lower body includes an external flow channel, an internal flow channel, and an air-material inlet connected to the external flow channel; The upper body, located at the top of the lower body, includes an air-material channel with one end connected to the external flow channel. The powder classifier, located inside the upper body, is connected to the other end of the air-material channel and is capable of screening and separating powders of different particle sizes; the bottom outlet of the powder classifier is connected to the internal flow channel. A powder outlet pipe is connected to the top outlet of the powder classifier; fine powder mixed with air from the screened powder enters the powder outlet pipe through the outlet of the powder classifier, and coarse powder from the screened powder falls into the internal flow channel. A short-circuit pipe connecting the air material channel and the powder material outlet channel is provided with a cross-section adjustment device.

[0023] In a preferred embodiment, the cross-section adjustment device is a slide gate valve.

[0024] In a preferred embodiment, the number of short-circuit pipes is at least one; the short-circuit pipe includes a first pipe section, a second pipe section, and an expansion joint connecting the first pipe section and the second pipe section; the cross-section adjustment device is disposed on the first pipe section. Attached Figure Description

[0025] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0026] Figure 1 This is a schematic diagram of the slag powder production equipment according to one embodiment of the present invention; Figure 2This is a schematic flowchart of a method for producing slag powder with different fineness requirements using the same vertical mill in one embodiment of the present invention. Figure 3 This is a schematic flowchart of a method for producing slag powder with different fineness requirements using the same vertical mill in another embodiment of the present invention. Figure 4 This is a schematic flowchart of a method for producing slag powder with different fineness requirements using the same vertical mill in another embodiment of the present invention. Figure 5 This is a schematic flowchart illustrating a method for producing slag powder with different fineness requirements using the same vertical mill in another embodiment of the present invention. Detailed Implementation

[0027] To more clearly illustrate the overall concept of this application, a detailed explanation will be provided below with reference to the accompanying drawings.

[0028] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In this application, unless otherwise expressly specified and limited, "upper" or "lower" of the first feature and the second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two connected entities are not connected through a transitional structure, but rather formed as a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0031] In this application, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0032] like Figure 2 The flowchart, in one embodiment, discloses a method for producing slag powder with different fineness requirements using the same vertical mill, including the following steps: a first feed stream is fed into the classifier of the vertical mill to separate slag powder of different fineness, resulting in a second feed stream and a residue stream; the second feed stream is fed into the outlet pipe; air carries a portion of the first feed stream through a short-circuit pipe into the outlet pipe to mix with the second feed stream, forming a customized slag powder product; after the customized slag powder production is completed, the short-circuit pipe is closed, and normal slag powder production is resumed.

[0033] As described above, the first feed stream, which is the semi-finished mineral powder that has not undergone screening by the air classifier, contains a certain amount of coarse particles. It enters the outlet pipe directly through a short-circuit pipe, allowing it to mix with the screened slag powder product to obtain a product that meets quality requirements, such as a minimum 5% fineness sieve residue. In other words, it is possible to introduce coarse mineral powder particles into the product through a short-circuit pipe on the same vertical mill, adjusting the product to meet new quality requirements without manufacturing or purchasing new equipment. This adaptable approach can accommodate new quality requirements or downstream fineness requirements for the mineral powder product. It can be applied to existing equipment with reasonable technical modifications to implement new process methods. Therefore, when producing a product with a high fineness sieve residue content in the same vertical mill, this can be achieved by opening the short-circuit pipe; if normal powder production is required, the short-circuit pipe should be closed. Before starting and shutting down the vertical mill, ensure the short-circuit channel is closed. See the other embodiments below for details.

[0034] like Figure 3 As shown, another embodiment further includes the following step: adjusting the cross-sectional dimensions of the short-circuit pipe according to the target product quality requirements.

[0035] The cross-sectional dimensions of the short-circuit pipe can be adjusted, allowing for both closed and open extreme adjustment modes. By adjusting the opening range of the short-circuit pipe, the cross-sectional dimensions can be adjusted, thereby controlling the amount of coarse particles mixed into the product. This allows the product to meet the quality requirements of different products.

[0036] Figure 4The implementation process of a further embodiment is illustrated. The cross-sectional size of the short-circuit pipe is adjusted according to the target product quality requirements. This includes screening and separating slag powder of different fineness while opening the short-circuit pipe to the first cross-sectional size. After the material flow is uniform and stable, the fineness sieve residue content of the slag powder flowing out of the outlet pipe is detected. If it meets the target product quality requirements, the cross-section of the short-circuit pipe is kept at the first cross-sectional size.

[0037] The specific adjustment process can be implemented according to the product situation of the outlet pipeline. If it is determined by calculation or derivation that the size of the short-circuit pipeline needs to be kept at the first cross-sectional size to obtain products that meet the target product quality, then the pipeline should be opened accordingly and production should be carried out. If it does meet the requirements, then production can continue until the output requirements are met.

[0038] Figure 5 The method implementation flow in another embodiment is illustrated. If the fineness sieve residue content of the slag powder flowing out of the outlet pipe does not meet the target product quality requirements, the cross-sectional size of the short-circuit pipe is adjusted to the second cross-sectional size. After the material flow is uniform and stable, the fineness sieve residue content of the slag powder flowing out of the outlet pipe is detected. If it meets the target product quality requirements, the cross-section of the short-circuit pipe is kept at the second cross-sectional size; if it does not meet the requirements, the cross-sectional size of the short-circuit pipe is adjusted again.

[0039] If the first attempt fails, the calculation can be repeated, and the cross-sectional dimensions of the short-circuit pipe can be adjusted to the second cross-sectional dimension. The product quality should be tested again. If it meets the requirements, the open cross-sectional dimension of the short-circuit pipe should be kept at the second cross-sectional dimension. If it does not meet the requirements, continue to adjust according to the above steps.

[0040] As described in the background section above, new standards are currently in effect. Therefore, in a specific embodiment of the present invention, one of the target product quality requirements is to meet the S95 grade mineral powder product quality requirements; the other target product quality requirement is to meet the requirement that the fineness sieve residue is not less than 5%.

[0041] In embodiments not shown in the figure, the method of the present invention further includes calculating the correlation between different target product quality requirements and the cross-sectional dimensions of the short-circuit pipe through flow field simulation, and forming a mapping relationship.

[0042] Before adjusting the cross-sectional dimensions of the short-circuit pipe, a model can be built using flow field simulation techniques, such as Ansysfluent flow field and particle trajectory analysis. This model can then be used to obtain vector and cloud maps of the flow field, as well as particle trajectory maps, for different cross-sectional dimensions of the short-circuit pipe. This simulation method saves on adjustment time and computational load. Subsequent comparative data can be used as feedback to correct the model, thereby improving accuracy. Ultimately, an accurate mapping relationship can be obtained, allowing for the determination of the corresponding cross-sectional dimensions of the short-circuit pipe for different product quality requirements.

[0043] By using flow field simulation, the correlation between different target product quality requirements and the cross-sectional dimensions of the short-circuit pipe in vertical mills of different specifications can be calculated, and a mapping relationship can be established. The method can be applied to a wider range of scenarios.

[0044] In addition, combined Figure 1 The slag powder production equipment for implementing the above method includes a lower body 100, comprising an external flow channel, an internal flow channel, and an air-material inlet (not shown in the figure, a common structure for vertical mill equipment); an upper body 200 located at the top of the lower body 100, including an air-material channel with one end connected to the external flow channel; a powder classifier 210 located inside the upper body 200, connected to the other end of the air-material channel, capable of screening and separating powders of different particle sizes; the bottom outlet of the powder classifier 210 connected to the internal flow channel; and a powder outlet pipe 300 connected to the top outlet of the powder classifier 210; the fine powder mixed with air from the screened powder enters the powder outlet pipe 300 through the outlet of the powder classifier 210, while the coarse powder falls into the internal flow channel. This structure represents the basic structure of a vertical mill, and traditional vertical mill equipment possesses this structure for production before new product quality requirements emerge.

[0045] In addition, in the embodiments of the present invention, a short-circuit pipe 400 is provided connecting the air material channel and the powder outlet channel 300, and the short-circuit pipe 400 is provided with a cross-section adjustment device.

[0046] By installing a short-circuit pipe connecting the ventilation material channel and the powder outlet channel, a certain amount of coarse particles can be introduced into the powder outlet channel to mix with the product, adjusting the product to meet new quality requirements. When producing another batch of product, if the quality requirements change, the cross-sectional dimensions of the short-circuit pipe can be adjusted to adapt the product to the new requirements. This localized improvement saves on the cost of manufacturing or purchasing new equipment, allowing the same vertical mill to produce products meeting at least two different quality requirements. It also makes the equipment highly adaptable, able to accommodate new product quality requirements.

[0047] It saves not only on procurement costs, but also on land costs and maintenance costs, making it economical. Furthermore, its structure can be adapted from existing vertical mill equipment, making it suitable for a wide range of applications and highly valuable for widespread adoption.

[0048] Combination Figure 1 The cross-section adjustment device 440 is a slide gate valve. The slide gate valve allows for precise and sensitive proportional adjustment of the short-circuit pipe cross-section size, determining and maintaining the appropriate opening range. The specific structure of the slide gate valve is common in mechanical equipment and will not be described in detail.

[0049] like Figure 1 The number of short-circuit pipes 400 is one; in other embodiments not shown in the figure, two or more may be provided. The short-circuit pipe 400 includes a first pipe section 410, a second pipe section 420 and an expansion joint 430 connecting the first pipe section 410 and the second pipe section 420; a cross-section adjustment device 440 is provided in the first pipe section 410.

[0050] The technical approach and implementation process of this invention will be fully described below with examples. Taking the modification of existing vertical mill equipment to implement a new process method as an example: ① Determine the renovation needs and formulate renovation goals; ② Estimate the cross-sectional dimensions of the short-circuit pipe based on actual production conditions; ③ The experiment determines the amount of thermal displacement between the unit and the air outlet duct; ④ Design short-circuit pipes and expansion joints, and prepare operating procedures; ⑤ Prepare spare parts and materials, and implement the modification; ⑥ The experiment determined the correlation between the opening degree of the short-circuit pipe gate and the product fineness sieve residue; ⑦ The critical value of the upper limit of the sieve residue of the ore powder was determined by experiment; ⑧ Modify operating procedures to guide production.

[0051] The central control process operation procedures implemented in this method include: ① Determine the production of high-screen residue products - customize mineral powder and quality indicators; ② First, adjust the system's air intake and the classifier's speed to appropriate parameters, then open the short-circuit pipe gate to a certain degree; ③After the customized mineral powder arrives at the finished product warehouse, the product will be transferred to the corresponding warehouse; ④ Adjust the opening of the short-circuit pipe gate according to the test residue data. Other operation controls are the same as the control concept for normal mineral powder production. ⑤ When it is decided to stop producing customized mineral powder products, the products should first be moved to the corresponding warehouse; ⑥ Then close the short-circuit pipe gate and adjust the system control parameters to appropriate values; ⑦ Restore normal mineral powder production control based on laboratory test data.

[0052] by Figure 1 Taking this as an example, this is a schematic diagram of the combination of a slag powder vertical mill and an air outlet duct.

[0053] A short-circuit pipe 400 is installed between the upper body 200 and the outlet duct 300 of the vertical mill. The short-circuit pipe 400 has an expansion joint 430 and a pipe gate 440. The cross-sectional area and dimensions of the short-circuit pipe 400 are estimated based on the specifications of the outlet duct 300 and the mill outlet. Based on the temperature changes of the upper body 200, lower body 100, and outlet duct 300 of the slag powder vertical mill, the thermal displacement between the upper body 200 and the outlet duct 300 is tested, and the thermal displacement at the extreme temperature between the upper body 200 and the outlet duct 300 is calculated accordingly. The short-circuit pipe 400, pipe gate 440, expansion joint 430, and auxiliary facilities such as platforms and stairs are designed. Assembly and modification are completed, and test operating procedures for producing high-residue products are prepared. The correspondence between the opening degree of the short-circuit pipe gate 440 and the fineness sieve residue of the slag powder product is determined by testing according to the operating procedures. The operating procedures are then revised to guide trial production.

[0054] The central control process operation flow in this embodiment is as follows: ①After receiving the notification to produce customized mineral powder, request the production quality control indicators from the laboratory; ② First, increase the speed of the air classifier by 1.5Hz, fully open the short-circuit pipe gate, then close the short-circuit pipe gate to 70%, and the system will not move when the air is pulled. ③ Start timing the moment the short-circuit pipe gate is opened. After five minutes of washing and grinding, transfer the product to the customized mineral powder warehouse and notify the laboratory at the same time. ④ Adjust the opening of the short-circuit pipe gate according to the sieve residue data tested by the laboratory; adjust other parameters in the same way as normal mineral powder production control to ensure that the specific surface area is qualified; ⑤ Upon receiving notification to cease production of customized mineral powder products, promptly transfer the products to the regular mineral powder product warehouse and simultaneously notify the laboratory; ⑥ Immediately close the short-circuit pipe gate. After it is completely closed, adjust the system control parameters to appropriate values. ⑦ Adjust the grinding conditions based on the test data and restore normal mineral powder production control.

[0055] The following precautions should be taken during the operation of the central control system: ① During production, the mill is not started and stopped using the process of customizing mineral powder, so as to avoid the impact of fine powder formed during empty milling on the fineness and quality of the product; ② During the production of washing and grinding, firstly, it is necessary to ensure that the washing and grinding material does not enter the customized mineral powder silo; secondly, attention should be paid to the operation sequence and interval time to ensure that the specific surface area of ​​the washing and grinding mineral powder is qualified; and thirdly, the washing and grinding time should be shortened as much as possible. ③ After the mill stops, be sure to open the pipeline gate valve to empty the pipeline and prevent the mineral powder inside the pipeline from caking; before starting the mill, be sure to check and ensure that the pipeline gate valve is in the closed position.

[0056] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0057] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0058] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method for producing slag powder with different fineness requirements using the same vertical mill, wherein, The vertical mill includes The lower body includes an external flow channel, an internal flow channel, and an air-material inlet connected to the external flow channel; The upper body, located at the top of the lower body, includes an air-material channel with one end connected to the external flow channel. The powder classifier, located inside the upper body, is connected to the other end of the air-material channel and is capable of screening and separating powders of different particle sizes; the bottom outlet of the powder classifier is connected to the internal flow channel. A powder outlet pipe is connected to the top outlet of the powder classifier; fine powder mixed with air from the screened powder enters the powder outlet pipe through the outlet of the powder classifier, and coarse powder from the screened powder falls into the internal flow channel. A short-circuit pipe connecting the air material channel and the powder outlet pipe, the short-circuit pipe being equipped with a cross-section adjustment device; Includes the following steps: The first material stream is fed into the classifier of the vertical mill to separate slag powder of different fineness, resulting in the second material stream and the residue stream. Allow the second material flow to enter the powder outlet pipe; Air carries a portion of the first material flow through a short-circuit pipe into the powder outlet pipe, where it mixes with the second material flow to form a customized mineral powder product. After completing the production of the customized mineral powder, the short-circuit pipeline is shut off, and normal mineral powder production is resumed; this also includes the following steps: Adjusting the cross-sectional dimensions of the short-circuit pipe according to the target product quality requirements, including... While screening and separating slag powder of different fineness, the short-circuit pipe is opened to the first cross-sectional size, and the fineness residue content of the slag powder flowing out of the powder outlet pipe is detected. If it meets the quality requirements of the target product, the cross-section of the short-circuit pipe is kept at the first cross-sectional size.

2. The method for producing slag powder with different fineness requirements using the same vertical mill as described in claim 1, characterized in that, If it does not meet the requirements, adjust the short-circuit pipe to the second cross-sectional dimension. Detect the fineness and residue content of the slag powder flowing out of the powder outlet pipe. If it meets the target product quality requirements, keep the cross-section of the short-circuit pipe at the second cross-sectional dimension; otherwise, adjust the cross-sectional dimension of the short-circuit pipe again.

3. The method for producing slag powder with different fineness requirements using the same vertical mill as described in claim 2, characterized in that, One of the target product quality requirements is that it meets the quality requirements of S95 grade mineral powder products; the other of the target product quality requirements is that the fineness sieve residue is not less than 5%.

4. The method for producing slag powder with different fineness requirements using the same vertical mill as described in claim 3, characterized in that, By using flow field simulation, the correlation between different target product quality requirements and the cross-sectional dimensions of the short-circuit pipe is calculated, and a mapping relationship is formed.

5. The method for producing slag powder with different fineness requirements using the same vertical mill as described in claim 4, characterized in that, By using flow field simulation, the correlation between different target product quality requirements and the cross-sectional dimensions of the short-circuit pipe in vertical mills of different specifications is calculated, and a mapping relationship is formed.

6. A slag powder production equipment, characterized in that, include The lower body includes an external flow channel, an internal flow channel, and an air-material inlet connected to the external flow channel; The upper body, located at the top of the lower body, includes an air-material channel with one end connected to the external flow channel. The powder classifier, located inside the upper body, is connected to the other end of the air-material channel and is capable of screening and separating powders of different particle sizes; the bottom outlet of the powder classifier is connected to the internal flow channel. A powder outlet pipe is connected to the top outlet of the powder classifier; fine powder mixed with air from the screened powder enters the powder outlet pipe through the outlet of the powder classifier, and coarse powder from the screened powder falls into the internal flow channel. A short-circuit pipe connecting the air-material channel and the powder outlet pipe is provided with a cross-section adjustment device.

7. The slag powder production equipment as described in claim 6, characterized in that, The cross-section adjustment device is a slide gate valve.

8. The slag powder production equipment as described in claim 7, characterized in that, The number of short-circuit pipes is at least one; the short-circuit pipe includes a first pipe section, a second pipe section, and an expansion joint connecting the first pipe section and the second pipe section; the cross-section adjustment device is disposed in the first pipe section.

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