A cement grinding system and method with adjustable particle size distribution

Abstract

The present invention relates to a cement grinding system and method with adjustable particle size distribution, the system includes a solid waste treatment subsystem, including a solid waste storage and conveying device, a first classifier for classifying materials, and a first powder classifier for classifying dust-containing airflow; an additive material processing subsystem, including an additive material storage and conveying device, a second classifier for classifying additive materials, and a second powder classifier for classifying the dust-containing airflow of the second classifier; a powder material mixing subsystem, including a plurality of powder material warehouses for storing finished materials, a finished powder material warehouse for storing solid waste finished materials and added finished materials, a solid waste powder material warehouse for storing solid waste primary materials, and an added powder material warehouse for storing added primary materials. The present invention can process solid waste and additive materials separately to obtain raw materials of different particle sizes, and store them separately for standby use, and perform reasonable grading during cement production and processing, thereby improving the quality of cement production.

Description

Technical Field

[0001] The invention relates to the technical field of cement production, in particular to solid waste grinding treatment and use for adjusting raw material ratio, and in particular to a cement grinding system and method with adjustable particle size distribution. Background Art

[0002] As we all know, cement is a micron-sized powder material. From the perspective of material composition, cement is a hydraulic cementing material mainly composed of cement clinker, a variety of auxiliary cementing materials (slag, steel slag, fly ash and other solid wastes) and a small amount of gypsum. From the perspective of particle size, cement is a powder material composed of particles of different sizes, with a distribution range of about 0μm to 100μm.

[0003] The particle size distribution has a great influence on the performance of the material. A large number of studies have pointed out that cement clinker particles with a particle size between 10μm and 45μm contribute the most to the 28d strength. Too much cement clinker content less than 10μm will increase the standard consistency water requirement of cement, which is not conducive to the working performance of the concrete prepared with it. As the particle size of slag powder and steel slag powder decreases, the cementing properties of slag powder and steel slag powder less than 10μm are greatly improved, which has a great contribution to the strength. It can be seen that the particle size range of 0μm to 100μm of cement should be filled according to the different characteristics of cement clinker and auxiliary cementitious materials. For example, 0μm to 10μm is filled with slag powder and steel slag powder, and 10μm to 45μm is filled with cement clinker to give full play to the cementing properties of the material.

[0004] By adjusting the ratio of each particle size range of cement powder, the overall particle size distribution of cement can be made to tend towards Fuller distribution, thereby achieving a higher packing density, improving strength, increasing the utilization rate of solid waste such as slag and steel slag, and reducing the amount of clinker used.

[0005] Regarding the morphology of cement particles, the higher the sphericity of the cement particles, the smaller the friction between the cement particles. Under the same conditions, the fluidity of the corresponding cement slurry is better, and the cement particles are easier to pack densely, thereby improving the strength.

[0006] In the final grinding process of cement production, the particle size distribution of cement produced by different grinding process systems is also quite different, resulting in large differences in cement standard consistency water requirement, strength and admixture compatibility. For example, the particle size distribution of cement produced by the open-circuit mill system is roughly 15% of <3μm particles and 62% of 3-32μm particles; the particle size distribution of cement produced by the roller press closed-circuit mill combined grinding system is roughly 11% of <3μm particles and 67% of 3-32μm particles; at the same time, compared with the cement produced by the roller press closed-circuit mill combined grinding system, the cement produced by the open-circuit mill system has a lower standard consistency water requirement and better admixture compatibility, but the open-circuit mill system has the disadvantages of high energy consumption and low output.

[0007] The above shows that the traditional grinding process system cannot effectively and accurately control the overall particle size distribution of the product cement. The overall particle size distribution of cement deviates greatly from the Fuller distribution, which is not conducive to the close stacking of particles and requires a large amount of water for standard consistency. The particle size distribution of each component of cement is distributed according to the grindability of its component materials, and its gelling property cannot be fully exerted. The amount of clinker in cement is too large, and the utilization rate of solid waste is not high. The sphericity of the cement particle morphology needs to be improved.

[0008] Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the prior art. Summary of the invention

[0009] In order to overcome at least one of the defects mentioned above, the present invention proposes a cement grinding system and method with adjustable particle size distribution. According to the particle size distribution of cement component materials such as clinker, steel slag and slag for efficient gelling and hydration, materials in different particle size ranges are prepared by using different grinding equipment and powder selection equipment. After metering, they enter the mixing and shaping equipment for uniform mixing and particle morphology shaping, and finally a high-quality cement product with efficient utilization of solid waste is obtained.

[0010] In order to achieve the above purpose, the grinding system disclosed in the present invention can adopt the following technical solutions:

[0011] A cement grinding system with adjustable particle size distribution, comprising:

[0012] The solid waste treatment subsystem includes a solid waste storage and conveying device, a first classifier for material sorting, and a first powder classifier for sorting the dust-laden airflow of the first classifier, wherein the first powder classifier classifies the solid waste from fine to coarse and outputs the solid waste into finished solid waste material, first-level solid waste material, and second-level solid waste material, wherein the finished solid waste material is received and conveyed by the first dust collector;

[0013] The additive material processing subsystem includes an additive material storage and conveying device, a second classifier for classifying the additive material, and a second powder classifier for classifying the dust-laden airflow of the second classifier. The second powder classifier classifies the additive material from fine to coarse and outputs it as an additive finished material and an additive primary material, wherein the additive finished material is received and conveyed by the second dust collector;

[0014] The powder mixing subsystem includes several powder storages for storing finished materials, including a finished powder storage connected to and coordinated with the first dust collector and the second dust collector and used to store solid waste finished materials and added finished materials, including a solid waste powder storage connected to the first powder selector and used to store solid waste primary materials, including an added powder storage connected to the second powder selector and used to store added primary materials. Multiple powder storages transport materials to the modulation tube mill for producing cement.

[0015] The cement grinding system disclosed above uses solid waste and additives for preliminary processing, and selects solid waste materials and additives that meet the particle size requirements as raw materials for subsequent cement production, wherein the solid waste materials include steel slag, slag, etc., and the additives include clinker and gypsum, etc. During the sorting, only fine particles in the dusty airflow are selected, and the materials with larger particles are processed by a roller press or a grinder until a dusty airflow is formed and then sorted; during the powder selection, the materials are divided into multiple material levels. The requirements for particles of different particle sizes in the cement preparation process are different. Therefore, the finished material and the first-level material that meet the requirements for cement preparation are stored separately and can be sent to the subsequent cement preparation, while the second-level material or even the third-level material that does not meet the preparation requirements need to be repeatedly processed until the preparation requirements are met.

[0016] Furthermore, in the present invention, the solid waste treatment subsystem can be realized by a variety of equipment when reprocessing materials. Here, optimization is performed and one feasible option is proposed: the solid waste treatment subsystem also includes a roller press, and the materials output after being processed by the roller press enter the first sorting machine through the solid waste storage and conveying device. When such a solution is adopted, the roller press can crush materials with larger particle size and higher hardness such as steel slag and slag to obtain finished materials and primary materials for preparing cement as soon as possible.

[0017] Furthermore, solid waste that does not meet the preparation requirements is screened and sent back for processing at the first sorting machine. Here, an optimization is made and one of the feasible options is proposed: the first sorting machine is connected to the roller press and is used to convey the sorted solid particle material to the roller press; the first powder selecting machine also sorts the solid waste and outputs the solid waste tertiary material, and the first powder selecting machine is connected to the roller press and sends the solid waste tertiary material to the roller press. When such a solution is adopted, the solid waste tertiary material belongs to the material that does not meet the cement preparation requirements. After being processed again or even multiple times by the roller press, it reaches the finished product level or the first level material for preparing cement and can be conveyed backward.

[0018] Furthermore, for some solid waste that does not meet the requirements for cement production, there is no need to return it for treatment, and mixing and blending with additives can also meet the production requirements. Here, we optimize and propose one of the feasible options: the additive storage and transportation device includes an intermediate bin, and the first powder selector is connected to the intermediate bin and transports the solid waste secondary material to the intermediate bin. When such a solution is adopted, the secondary material in the intermediate bin is mixed and added with the additive according to the set ratio, and then re-sorted or ground to finally meet the requirements for cement production.

[0019] Furthermore, part of the materials screened by the first dust collector and the second dust collector can also be directly sent to the sorting machine. The specific method is not limited to the only one. Here, an optimization is made and one feasible option is proposed: the first dust collector and the second dust collector are also provided with return lines, wherein the return line of the first dust collector is used to return the materials to the first sorting machine, and the return line of the second dust collector is used to return the materials to the second sorting machine. When such a scheme is adopted, part of the materials that are not completely separated can be sent back to the sorting machine for breaking up, thereby realizing rapid sorting, improving efficiency and reducing energy consumption.

[0020] Furthermore, the method of reprocessing the additive is not limited to a single method. Here, an optimization is made and one feasible option is proposed: the additive processing subsystem also includes a vertical mill, and the material output after the vertical mill processing enters the second sorting machine through the additive storage and conveying device. When such a solution is adopted, the vertical mill can grind the additive and reduce the particle size of the material so that the material meets the requirements of cement preparation.

[0021] Furthermore, the additives that do not meet the requirements of cement preparation are sent back to the second classifier for re-grinding. Here, an optimization is made and one of the feasible options is proposed: the second classifier is connected to the vertical mill and is used to transport the sorted solid particle materials to the vertical mill; the second classifier also sorts the additives and outputs the secondary additive materials, and the second classifier is connected to the vertical mill and transports the secondary additive materials to the vertical mill. When such a solution is adopted, the vertical mill processes the additives and then transports them for sorting again until they meet the requirements of cement preparation.

[0022] The above content describes the grinding system. The present invention also discloses a grinding method, which is described below.

[0023] A cement grinding method with adjustable particle size distribution includes the following steps:

[0024] Sorting out the dusty airflow in the solid waste, and classifying the particles in the dusty airflow from fine to coarse, wherein the solid waste reaching the finished product level is collected, transported and stored, and the solid waste reaching the first-level material is transported and stored separately;

[0025] Sorting out the dusty airflow in the additives, and classifying the particles in the dusty airflow from fine to coarse, wherein the additives reaching the finished product level are collected, transported and stored, and the additives reaching the first-level material are transported and stored separately;

[0026] The finished material, solid waste primary material and added primary material are mixed according to a set ratio and used for cement preparation.

[0027] The cement grinding method disclosed above aims to crush, grind and process solid waste and additives to meet the particle size requirements for cement preparation, store materials in different particle size ranges separately, facilitate material preparation for cement preparation, and improve the quality of cement production.

[0028] Furthermore, some materials can be directly selected and stored after reaching the particle size requirement for cement preparation, while some materials that do not reach the particle size requirement need to be processed. Specifically, optimization is performed here and one feasible option is proposed: the particulate matter in the sorted solid waste and the particulate matter in the sorted additive are crushed or ground again. When such a scheme is adopted, the number of crushing or grinding is not limited, as long as the material that does not reach the particle size requirement is crushed or ground until the particle size requirement is reached.

[0029] Furthermore, the materials in the dusty airflow that do not meet the particle size requirements are also reprocessed. Here, we optimize and propose one of the feasible options: the solid waste and additives that do not meet the finished product level or first-level material separated from the dusty airflow are crushed or ground again. When such a solution is adopted, the solid waste or additives are directly reprocessed by the corresponding roller press or grinder.

[0030] Furthermore, some solid waste that does not meet the requirements for cement preparation can be mixed with additives and then processed together. Specifically, the following feasible options can be adopted: the solid secondary material sorted out from the dusty airflow can be mixed with additives for subsequent sorting and processing, and the solid tertiary material sorted out from the dusty airflow can be directly crushed or ground.

[0031] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0032] The system disclosed in the present invention can process solid waste and additives separately to obtain raw materials of different particle sizes that meet the requirements of cement production and processing, and store different raw materials separately for standby use, and perform reasonable grading during cement production and processing, thereby improving the quality of cement production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 Schematic diagram of the overall composition of cement grinding.

[0035] Figure 2 Schematic diagram of the grinding process.

[0036] In the above drawings, the meanings of the various reference numerals are as follows:

[0037] 1. Slag storage device; 2. Slag storage device; 3. First classifier; 4. Roller press; 5. First powder classifier; 6. First dust collector; 7. Clinker storage device; 8. Gypsum storage device; 9. Intermediate bin; 10. Vertical mill; 11. Second classifier; 12. Second powder classifier; 13. Second dust collector; 14. Solid waste powder warehouse; 15. Add powder warehouse; 16. Finished product powder warehouse; 17. Weighing scale; 20. Tempering tube mill. DETAILED DESCRIPTION

[0038] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0039] In view of the problem that the existing cement production grinding system is difficult to control the particle size of the material and cannot accurately perform grading, the following embodiments are optimized and solve the problems existing in the prior art.

[0040] Example 1

[0041] like Figure 1 As shown, a cement grinding system with adjustable particle size distribution comprises:

[0042] The solid waste treatment subsystem includes a solid waste storage and conveying device, a first sorting machine 3 for material sorting, and a first powder selecting machine 5 for sorting the dust-containing airflow of the first sorting machine 3. The first powder selecting machine 5 sorts the solid waste from fine to coarse and outputs it as solid waste finished materials, solid waste primary materials and solid waste secondary materials, wherein the solid waste finished materials are received and conveyed by the first dust collector 6 for processing.

[0043] Preferably, the solid waste storage and transportation device comprises a slag storage device 1, a slag storage device 2 and an elevator. The first classifier 3 is a V-type classifier, the first classifier 5 is a three-stage classifier, and the first dust collector 6 is a bag dust collector.

[0044] The added material processing subsystem includes an added material storage and conveying device, a second classifier 11 for classifying the added material, and a second powder classifier 12 for classifying the dust-containing airflow of the second classifier 11. The second powder classifier 12 classifies the added material from fine to coarse and outputs it as added finished material and added primary material, wherein the added finished material is received and conveyed by the second dust collector 13.

[0045] Preferably, the additive storage and conveying device includes a clinker storage device 7, a gypsum storage device 8 and an elevator. The second classifier 11 is a V-type classifier, the second classifier 12 is a two-stage classifier, and the second dust collector 13 is a bag dust collector.

[0046] The powder mixing subsystem includes several powder storages for storing finished materials, including a finished powder storage 16 which is connected and cooperated with the first dust collector 6 and the second dust collector 13 and is used to store solid waste finished materials and added finished materials, including a solid waste powder storage 14 which is connected to the first powder selector 5 and is used to store solid waste primary materials, including an added powder storage 15 which is connected to the second powder selector 12 and is used to store added primary materials. The multiple powder storages transport materials to the modulation tube mill for producing cement.

[0047] Preferably, the number of the powder storage bins is at least three, namely, a finished product powder storage bin 16 , a solid waste powder storage bin 14 and an added powder storage bin 15 .

[0048] The cement grinding system disclosed in this embodiment uses solid waste and additives for preliminary processing, and selects solid waste materials and additives that meet the particle size requirements as raw materials for subsequent cement production, wherein the solid waste materials include steel slag, slag, etc., and the additives include clinker and gypsum, etc. During the sorting, only fine particles in the dusty airflow are selected, and the materials with larger particles are processed by the roller press 4 or the grinder until the dusty airflow is formed and then sorted; during the powder selection, the materials are divided into multiple material levels, and the requirements for particles of different particle sizes in the cement preparation process are different. Therefore, the finished material and the first-level material that meet the requirements for cement preparation are stored separately and can be sent to the subsequent cement preparation, while the second-level material or even the third-level material that does not meet the preparation requirements needs to be repeatedly processed until the preparation requirements are met.

[0049] In this embodiment, the solid waste treatment subsystem can be implemented through a variety of equipment when reprocessing materials. This embodiment is optimized and adopts one of the feasible options: the solid waste treatment subsystem also includes a roller press 4, and the materials output after being processed by the roller press 4 enter the first sorting machine 3 through the solid waste storage and conveying device. When such a solution is adopted, the roller press 4 can crush materials with larger particle size and higher hardness such as steel slag and slag to obtain finished materials and primary materials for preparing cement as soon as possible.

[0050] Solid waste that does not meet the preparation requirements is screened at the first sorter 3 and sent back for processing. This embodiment is optimized and adopts one of the feasible options: the first sorter 3 is connected to the roller press 4 and is used to convey the sorted solid particulate material to the roller press 4; the first powder selector 5 also sorts the solid waste and outputs the solid waste tertiary material, and the first powder selector 5 is connected to the roller press 4 and conveys the solid waste tertiary material to the roller press 4. When such a scheme is adopted, the solid waste tertiary material belongs to the material that does not meet the cement preparation requirements. After being processed again or even multiple times by the roller press 4, it reaches the finished product level or the first level material for preparing cement and can be conveyed backward.

[0051] For some solid waste that does not meet the requirements for preparing cement, it is not necessary to return it for treatment, and mixing and blending with additives can also meet the requirements for preparation. This embodiment is optimized and adopts one of the feasible options: the additive storage and conveying device includes an intermediate bin 9, and the first powder selector 5 is connected to the intermediate bin 9 and conveys the solid waste secondary material to the intermediate bin 9. When such a solution is adopted, the secondary material in the intermediate bin 9 is mixed and added with the additives according to the set ratio, and then re-sorted or ground to finally meet the requirements for preparing cement.

[0052] Part of the screened materials in the first dust collector 6 and the second dust collector 13 can also be directly sent to the sorting machine, which is not limited to the specific method. This embodiment is optimized and adopts one of the feasible options: the first dust collector 6 and the second dust collector 13 are also respectively provided with a return line, wherein the return line of the first dust collector 6 is used to return the materials to the first sorting machine 3, and the return line of the second dust collector 13 is used to return the materials to the second sorting machine 11. When such a solution is adopted, part of the materials that are not completely separated can be sent back to the sorting machine for breaking up, thereby realizing rapid sorting, improving efficiency and reducing energy consumption.

[0053] The method of reprocessing the additive is not limited to a single method. This embodiment optimizes and adopts one of the feasible options: the additive processing subsystem also includes a vertical mill 10, and the material output after being processed by the vertical mill 10 enters the second classifier 11 through the additive storage and conveying device. When such a solution is adopted, the vertical mill 10 can grind the additive and reduce the particle size of the material so that the material meets the requirements of cement preparation.

[0054] The additives that do not meet the requirements of cement preparation are sent back to the second classifier 11 for re-grinding. This embodiment is optimized and adopts one of the feasible options: the second classifier 11 is connected to the vertical mill 10 and is used to convey the sorted solid particle materials to the vertical mill 10; the second classifier 11 also sorts the additives and outputs the secondary additive materials, and the second classifier 11 is connected to the vertical mill 10 and conveys the secondary additive materials to the vertical mill 10. When such a solution is adopted, the vertical mill 10 processes the additives and then conveys them for sorting again until the requirements of cement preparation are met.

[0055] Example 2

[0056] The content of Example 1 describes the grinding system, and this example discloses a grinding method, which is described below.

[0057] like Figure 2 As shown, a cement grinding method with adjustable particle size distribution includes the following steps:

[0058] Sorting out the dusty airflow in the solid waste, and classifying the particles in the dusty airflow from fine to coarse, wherein the solid waste reaching the finished product level is collected, transported and stored, and the solid waste reaching the first-level material is transported and stored separately;

[0059] Sorting out the dusty airflow in the additives, and classifying the particles in the dusty airflow from fine to coarse, wherein the additives reaching the finished product level are collected, transported and stored, and the additives reaching the first-level material are transported and stored separately;

[0060] The finished material, solid waste primary material and added primary material are mixed according to a set ratio and used for cement preparation.

[0061] The cement grinding method disclosed in this embodiment aims to crush, grind and process solid waste and additives to meet the particle size requirements for cement preparation, store materials within different particle size ranges separately, facilitate material preparation for cement preparation, and improve the quality of cement production.

[0062] After some materials meet the particle size requirements for cement preparation, they can be directly selected and stored, while some materials that do not meet the particle size requirements need to be processed. Specifically, this embodiment optimizes and adopts one of the feasible options: the granular materials in the sorted solid waste and the granular materials in the sorted additives are crushed or ground again. When such a scheme is adopted, the number of crushing or grinding is not limited to a single number, as long as the materials that do not meet the particle size requirements are crushed or ground until the particle size requirements are met.

[0063] The materials in the dusty airflow that do not meet the particle size requirements are also reprocessed. This embodiment is optimized and adopts one of the feasible options: the solid waste and additives that do not meet the finished product level or the first-level material separated from the dusty airflow are crushed or ground again. When such a solution is adopted, the solid waste or additives are directly reprocessed by the corresponding roller press or grinder.

[0064] Some solid waste that does not meet the requirements for cement preparation can be mixed with additives and then processed together. Specifically, one of the following feasible options can be adopted: the solid secondary material sorted out from the dusty airflow can be mixed with additives for subsequent sorting and processing, and the solid tertiary material sorted out from the dusty airflow can be directly crushed or ground.

[0065] According to the above method, the powder storage in the powder storage is shown in Table 1. After being measured at the bottom of the storage, it is transported to the tempering tube mill for mixing and shaping, and then enters the cement finished product storage. The composition of cement is shown in Table 1.

[0066] Table 1 Powder situation

[0067] project Solid waste powder storage Add powder storage Finished powder warehouse D10μm 3.6 4.7 0.7 D50μm 21.7 17.1 1.6 D90μm 55.6 40.1 4.3 Powder Type Steel slag Clinker Steel slag or slag + clinker powder Mass fraction of prepared cement % 37～23 45～65 18～12

[0068] The materials in the three powder storages can be weighed by weighing scales and quantitatively added to the tempering tube mill for cement production.

[0069] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A cement grinding system with adjustable particle size distribution, characterized in that: include: The solid waste treatment subsystem comprises a solid waste storage and conveying device, a first sorting machine (3) for sorting materials, and a first powder selecting machine (5) for sorting the dust-containing airflow of the first sorting machine (3), wherein the first powder selecting machine (5) sorts the solid waste from fine to coarse and outputs the solid waste into solid waste finished materials, solid waste primary materials, and solid waste secondary materials, wherein the solid waste finished materials are received and conveyed by a first dust collector (6); The additive material processing subsystem comprises an additive material storage and conveying device, a second classifier (11) for classifying the additive material, and a second powder classifier (12) for classifying the dust-containing airflow of the second classifier (11), wherein the second powder classifier (12) classifies the additive material from fine to coarse and outputs the additive material as an additive finished material and an additive primary material, wherein the additive finished material is received and conveyed by a second dust collector (13); The powder material preparation subsystem includes a plurality of powder material storages for storing finished materials, including a finished material powder material storage (16) connected to and coordinated with the first dust collector (6) and the second dust collector (13) and used to store solid waste finished materials and added finished materials, including a solid waste powder material storage (14) connected to the first powder classifier (5) and used to store solid waste primary materials, and including an added powder material storage (15) connected to the second powder classifier (12) and used to store added primary materials. The plurality of powder material storages transport materials to the modulation tube mill for producing cement; The first dust collector (6) and the second dust collector (13) are also respectively provided with a return line, wherein the return line of the first dust collector (6) is used to return the material to the first classifier (3), and the return line of the second dust collector (13) is used to return the material to the second classifier (11); The solid waste treatment subsystem further comprises a roller press (4), and the material output after being processed by the roller press (4) enters the first sorting machine (3) through the solid waste storage and conveying device; The first classifier (3) is connected to the roller press (4) and is used to convey the sorted solid particulate material to the roller press (4); the first powder classifier (5) further classifies the solid waste and outputs the solid waste tertiary material, and the first powder classifier (5) is connected to the roller press (4) and conveys the solid waste tertiary material to the roller press (4); The additive material storage and conveying device comprises an intermediate bin (9), and the first powder classifier (5) is connected to the intermediate bin (9) and conveys the solid waste secondary material to the intermediate bin (9).

2. The cement grinding system with adjustable particle size distribution according to claim 1, characterized in that: The additive material processing subsystem further comprises a vertical mill (10), and the material output after being processed by the vertical mill (10) enters the second sorting machine (11) through the additive material storage and conveying device.

3. The cement grinding system with adjustable particle size distribution according to claim 2, characterized in that: The second classifier (11) is connected to the vertical mill (10) and is used to convey the sorted solid particulate material to the vertical mill (10); the second classifier (11) also classifies the added material and outputs the added secondary material; the second classifier (11) is connected to the vertical mill (10) and conveys the added secondary material to the vertical mill (10).

4. A cement grinding method with adjustable particle size distribution, using the cement grinding system according to any one of claims 1 to 3, characterized in that: The process includes the following: Sorting out the dusty airflow in the solid waste, and classifying the particles in the dusty airflow from fine to coarse, wherein the solid waste reaching the finished product level is collected, transported and stored, and the solid waste reaching the first-level material is transported and stored separately; Sorting out the dusty airflow in the additives, and classifying the particles in the dusty airflow from fine to coarse, wherein the additives reaching the finished product level are collected, transported and stored, and the additives reaching the first-level material are transported and stored separately; The finished material, solid waste primary material and added primary material are mixed according to a set ratio and used for cement preparation.

5. The cement grinding method with adjustable particle size distribution according to claim 4, characterized in that: The granular matter in the sorted solid waste and the granular matter in the sorted additive are crushed or ground again.

6. The cement grinding method with adjustable particle size distribution according to claim 4, characterized in that: The solid waste and additives that are not up to the finished product grade or first-grade material separated from the dusty airflow are crushed or ground again.

7. The cement grinding method with adjustable particle size distribution according to claim 6, characterized in that: The solid secondary material separated from the dusty airflow is mixed with the added material for subsequent separation and treatment, while the solid tertiary material separated from the dusty airflow is directly crushed or ground.

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