Preparation method of low-carbon cement

Abstract

The invention relates to the technical field of cement preparation, and discloses a preparation method of low-carbon cement, which comprises the following steps: preparing 70% + / -5% of limestone and 10% + / -5% of clay as raw materials, then selecting a proper amount of slag fly ash according to construction requirements, carrying out dry grinding and homogenization to prepare a cement raw material, calcining the cement raw material, and drying the cement raw material to obtain the low-carbon cement. According to the preparation method of the low-carbon cement, the cement clinker is pre-ground through the pre-grinding assembly arranged at the top of the roller press main body, so that the shutdown influence on a fixed roller and a movable roller due to the fact that the granularity of the cement exceeds the standard is avoided; meanwhile, iron impurities in cement clinker are removed by the magnetic bars, so that the influence of the iron impurities on the fixed roller and the movable roller is reduced, the grinding yield and efficiency of the fixed roller and the movable roller are improved, then the electricity consumption of the device is reduced, and the carbon emission of cement prepared by the device is indirectly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cement preparation, in particular to a method for preparing low-carbon cement. Background Art

[0002] Cement is a powdery hydraulic inorganic gelling material, which becomes a slurry after adding water and stirring. It can harden in the air or in water, and can firmly bond sand, stone and other materials together. The production of cement can generally be divided into three processes: raw material preparation, clinker calcination and cement grinding.

[0003] Cement grinding is the last process of cement manufacturing and also the process that consumes the most electricity. Its main function is to grind cement clinker (and retarder, performance adjustment material, etc.) to a suitable particle size (expressed by fineness, specific surface area, etc.), form a certain particle gradation, increase its hydration area, accelerate the hydration rate, and meet the requirements of cement paste coagulation and hardening;

[0004] Cement grinding is generally carried out using ball mill grinding systems, vertical mill final grinding systems and roller press final grinding systems. In these methods, such as the roller press final grinding system, two independent motors are required to drive two extrusion rollers respectively, and the extrusion rollers are also required to be equipped with a hydraulic system to control the extrusion pressure of the controller. In conjunction with other control systems and equipment, the roller press equipment has high power consumption. High power consumption requires high power generation, and high power generation will increase carbon emissions. Therefore, when using a roller press for grinding, optimizing the grinding system and improving grinding efficiency can indirectly reduce carbon emissions. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for preparing low-carbon cement, which solves the problems raised in the above background technology.

[0006] The present invention provides the following technical solution: a method for preparing low-carbon cement, comprising the following steps:

[0007] S1: According to the weight of cement produced according to construction requirements, select limestone and clay with corresponding proportions as the main raw materials, wherein the proportion of each raw material is limestone 70%±5%, clay 10%±5%, and then select an appropriate amount of slag fly ash 10%±5% according to construction requirements, and prepare cement raw materials through dry grinding and homogenization;

[0008] S2: calcining the cement raw material in a mechanized vertical kiln to prepare cement clinker;

[0009] S3: The prepared cement clinker is conveyed into the roller press, ground to the required particle size, and then proportioned by the clinker microcomputer batching system, so that natural gypsum and other mixed materials required for construction can be added to the cement clinker. The proportioned cement is homogenized, packaged by a packaging machine, and stored in a warehouse after packaging.

[0010] Optionally, the roller press in S3 includes a roller press body and a controller, support compartments are fixed on both sides of the roller press body, a disassembly door is hinged on the outside of the support compartment, a grinding chamber is provided inside the roller press body, a fixed roller is rotatably connected inside the grinding chamber, a feed port is provided on the top of the roller press body, the bottom of the grinding chamber is inclined, and a material collection door is hinged on the outside of one side of the lower end of the grinding chamber;

[0011] The inner walls of the two supporting boxes are fixed with hydraulic cylinders, which are controlled by a controller, a mounting frame is fixed to the outside of the output shaft of one of the hydraulic cylinders, a first motor is fixed to the inside of the mounting frame, and the first motor is controlled by a controller, an adjustment groove is provided on the side of the roller press body close to the mounting frame, and a movable roller is slidably connected to the inside of the adjustment groove, both ends of the movable roller and the fixed roller are respectively located inside the two supporting boxes, and a movable frame is rotatably connected to the outside of one end of the movable roller away from the mounting frame, and the movable frame is fixed to the output shaft of a hydraulic cylinder away from the mounting frame;

[0012] A pre-grinding assembly is provided on the top of the roller press body, and the pre-grinding assembly is used for pre-grinding cement clinker.

[0013] Optionally, the pre-grinding assembly includes a processing box, the bottom of which is fixed to the top of the roller press body, a box door is fixed to the side of the processing box close to the movable frame by bolts, a feed trough is provided at the top of the vertical part of the processing box, a pre-grinding cavity is provided at the bottom of the vertical part of the processing box, and a filter hole is provided at the bottom of the pre-grinding cavity;

[0014] A bracket is installed on the outside of the processing box near the mounting frame, and a second motor is fixed inside the bracket. The second motor is controlled by a controller, and the second motor consists of a driving motor and a gear. The processing box near the second motor is rotatably connected to the inside with a transmission shaft, and a gear plate is fixed on the outside of the transmission shaft, and the gear plate is located on the outside of the processing box. A crushing roller is clamped on the outside of the transmission shaft near one end of the processing box, and the crushing roller is located inside the pre-grinding chamber. A gearbox is fixed inside the supporting compartment near the mounting frame, and the fixed roller is transmission-connected to the gearbox, and the transmission shaft is transmission-connected to the gearbox at one end away from the processing box.

[0015] Optionally, a support frame is fixedly connected to the interior of the processing box below the pre-grinding chamber, a material receiving plate is clamped on the top of the support frame, a push rod is fixed on the top of the material receiving plate, special-shaped plates are fixed on both sides of the bottom of the material receiving plate, and a discharge port is opened on the surface of the material receiving plate.

[0016] Optionally, a collecting chamber is fixed to a side of the horizontal portion of the processing box close to the hydraulic cylinder, a first sealing door is fixed to a side of the collecting chamber close to the box door by bolts, a limiting frame is fixed to an inner wall of the processing box located above the collecting chamber, a plurality of magnetic bars are slidably connected inside the limiting frame, an electric telescopic rod is fixed to the inner wall of the horizontal portion of the processing box close to the hydraulic cylinder, and an output shaft of the electric telescopic rod is fixed to one of the magnetic bars, a scraper is fixed to an end of the magnetic bar away from the electric telescopic rod, a material receiving table is fixed to the interior of the processing box below the support frame, and the bottom of the scraper is abutted against the top of the material receiving table.

[0017] Optionally, the top of the limit frame is internally slidingly connected to multiple groups of observation rods, the number of groups of observation rods is consistent with the number of magnetic rods, and a limit plate is fixed to the top of the limit frame close to the electric telescopic rod. The internal thread of the limit plate is connected to a screw, the number of the screws is consistent with the number of magnetic rods, and each magnetic rod corresponds to a screw and a group of observation rods, and a bottom plate is fixed to the bottom of the screw, and a sponge grinding block is fixed to the bottom of the bottom plate, and the sponge grinding block is located above the magnetic rod.

[0018] Optionally, a sliding rod is slidably connected to the inside of both sides of the collecting chamber, and a connecting plate is fixed to one end of the sliding rod close to the electric telescopic rod, and the two connecting plates are respectively fixed to one of the magnetic bars.

[0019] Optionally, a dust collecting chamber is fixed to the horizontal portion of the processing box below the support frame, a second sealing door is hingedly connected to a side of the dust collecting chamber away from the second motor, a spring is fixed to a side of the dust collecting chamber away from the collecting chamber, a rubber plate is fixed to one end of the spring, the rubber plate is slidably connected to the dust collecting chamber, an air inlet is provided on the inner wall of the dust collecting chamber close to the collecting chamber, slots are provided on both sides of the inner wall of the dust collecting chamber on the air inlet, an air inlet baffle is hingedly connected to the inner wall of the dust collecting chamber close to the air inlet, connecting rods are fixed below both ends of the air inlet baffle, a linkage baffle is hingedly connected to the inner wall of the dust collecting chamber close to the slot, and the connecting rod is fixed to the linkage baffle;

[0020] An exhaust port is provided on the inner wall of the dust collecting chamber above the air inlet, and an exhaust baffle is hingedly connected on one side of the outer wall of the dust collecting chamber close to the collecting chamber.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The method for preparing low-carbon cement pre-grinds cement clinker through a pre-grinding assembly provided on the top of a roller press body, so that the particle size of the cement clinker can meet the standard, and the impact of excessive cement particle size on the fixed roller and the movable roller causing shutdown is avoided. At the same time, iron impurities in the pre-grinded cement clinker can be screened out and iron removal is performed through a magnetic rod, thereby reducing the impact of iron impurities on the fixed roller and the movable roller, improving the output and efficiency of the fixed roller and the movable roller grinding, and then reducing the power consumption of the present invention, and indirectly reducing the carbon emission of the present invention in preparing cement.

[0023] 2. The preparation method of the low-carbon cement is through an observation rod slidably connected inside the limit frame. When the surface of the magnetic rod is worn, the observation rod sinks when the magnetic rod passes under the observation rod, and then the corresponding screw can be rotated to control the sponge grinding block to contact the worn magnetic rod, and then the magnetic rod is polished and ground, thereby restoring the magnetism of the magnetic rod, enhancing the iron removal efficiency of the magnetic rod, and thereby improving the grinding efficiency of the fixed roller and the movable roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is an inner view of the roller press body of the present invention;

[0026] Figure 3 It is the structural interior view of the support box and the processing box of the present invention;

[0027] Figure 4 It is a schematic diagram of the positional relationship between the gearbox and the supporting compartment of the present invention;

[0028] Figure 5 It is a cross-sectional view of the structure of the present invention;

[0029] Figure 6 It is a structural cross-sectional view of the structural processing box of the present invention;

[0030] Figure 7 It is a structural cross-sectional view of the dust collecting chamber of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the support frame of the present invention;

[0032] Fig. 9 It is a schematic diagram of the positional relationship of the magnetic rod, the electric telescopic rod and the connecting plate of the structure of the present invention;

[0033] Fig.10 It is a structural cross-sectional view of the limiting frame of the present invention;

[0034] Fig.11 for Figure 5 A partial enlarged view of point A in the middle.

[0035] In the figure: 1. roller press body; 11. support box; 12. disassembly door; 13. grinding chamber; 14. fixed roller; 15. feed port; 16. receiving door; 2. hydraulic cylinder; 21. mounting frame; 22. first motor; 23. adjustment slot; 24. movable roller; 25. moving frame; 3. processing box; 31. box door; 32. feed slot; 33. pre-grinding chamber; 34. second motor; 35. transmission shaft; 351. gear plate; 36. crushing roller; 37. gearbox; 4. support frame; 41. receiving plate; 42. ejector rod; 43. shaped plate; 44, discharge port; 5, collecting chamber; 51, first sealing door; 52, limit frame; 53, magnetic rod; 54, electric telescopic rod; 55, scraper; 56, material receiving platform; 6, observation rod; 61, limit plate; 62, screw; 63, bottom plate; 64, sponge grinding block; 7, sliding rod; 71, connecting plate; 8, dust collecting chamber; 81, second sealing door; 82, spring; 83, rubber plate; 84, air inlet; 85, notch; 86, air inlet baffle; 87, connecting rod; 88, linkage baffle; 9, exhaust port; 91, exhaust baffle. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] See also Figure 1-11 , a method for preparing low-carbon cement, comprising the following steps:

[0039] S1: According to the weight of cement produced according to construction requirements, select limestone and clay with corresponding proportions as the main raw materials, wherein the proportion of each raw material is limestone 70%±5%, clay 10%±5%, and then select an appropriate amount of slag fly ash 10%±5% according to construction requirements, and prepare cement raw materials through dry grinding and homogenization;

[0040] S2: calcining the cement raw material in a mechanized vertical kiln to prepare cement clinker;

[0041] S3: The prepared cement clinker is conveyed into the roller press, and after being ground to the required particle size, the cement is proportioned through the clinker microcomputer proportioning system, so that the cement clinker can be added with natural gypsum and other mixed materials required for construction, and the proportioned cement is homogenized, and the homogenized cement is packaged by a packaging machine and stored in a warehouse after packaging;

[0042] The roller press in S3 includes a roller press body 1 and a controller. Support compartments 11 are fixed on both sides of the roller press body 1. A disassembly door 12 is hinged on the outside of the support compartment 11. A grinding chamber 13 is provided inside the roller press body 1. A fixed roller 14 is rotatably connected inside the grinding chamber 13. A feed inlet 15 is provided on the top of the roller press body 1. The bottom of the grinding chamber 13 is inclined, and a material receiving door 16 is hinged on the outside of one side of the lower end of the grinding chamber 13.

[0043] The inner walls of the two supporting compartments 11 are fixed with hydraulic cylinders 2, which are controlled by a controller, a mounting frame 21 is fixed to the outside of the output shaft of one of the hydraulic cylinders 2, a first motor 22 is fixed to the inside of the mounting frame 21, and the first motor 22 is controlled by the controller, an adjusting groove 23 is provided on the side of the roller press body 1 close to the mounting frame 21, and a movable roller 24 is slidably connected to the inside of the adjusting groove 23, the two ends of the movable roller 24 and the fixed roller 14 are respectively located inside the two supporting compartments 11, and the outside of the end of the movable roller 24 away from the mounting frame 21 is rotatably connected to a movable frame 25, and the movable frame 25 is fixed to the output shaft of a hydraulic cylinder 2 away from the mounting frame 21, and a pre-grinding assembly is provided on the top of the roller press body 1, and the pre-grinding assembly is used to pre-grind cement clinker;

[0044] The pre-grinding assembly includes a processing box 3, the bottom of which is fixed to the top of the roller press body 1, a box door 31 is fixed to the side of the processing box 3 close to the moving frame 25 by bolts, a feed trough 32 is provided at the top of the vertical part of the processing box 3, a pre-grinding chamber 33 is provided at the bottom of the vertical part of the processing box 3, and a filter hole is provided at the bottom of the pre-grinding chamber 33;

[0045] A bracket is installed on the outside of the processing box 3 near the mounting frame 21, and a second motor 34 is fixed inside the bracket. The second motor 34 is controlled by a controller, and the second motor 34 is composed of a driving motor and a gear. A transmission shaft 35 is rotatably connected to the inside of the processing box 3 near the second motor 34, and a gear plate 351 is fixed to the outside of the transmission shaft 35, and the gear plate 351 is located on the outside of the processing box 3. A crushing roller 36 is clamped on the outside of the transmission shaft 35 near one end of the processing box 3, and the crushing roller 36 is located inside the pre-grinding chamber 33. A gearbox 37 is fixed inside the support compartment 11 near the mounting frame 21, and the fixed roller 14 is in transmission connection with the gearbox 37, and the end of the transmission shaft 35 away from the processing box 3 is in transmission connection with the gearbox 37;

[0046] The processing box 3 is located inside and fixedly connected to a support frame 4 below the pre-grinding chamber 33, a material receiving plate 41 is clamped on the top of the support frame 4, a push rod 42 is fixed on the top of the material receiving plate 41, and special-shaped plates 43 are fixed on both sides of the bottom of the material receiving plate 41, and a discharge port 44 is opened on the surface of the material receiving plate 41, a collecting chamber 5 is fixed on the side of the horizontal part of the processing box 3 close to the hydraulic cylinder 2, and a first sealing door 51 is fixed to the side of the collecting chamber 5 close to the box door 31 by bolts, and a limiting frame 52 is fixed to the inner wall of the processing box 3 above the collecting chamber 5, and a plurality of magnetic rods 53 are slidably connected inside the limiting frame 52, an electric telescopic rod 54 is fixed to the inner wall of the horizontal part of the processing box 3 close to the hydraulic cylinder 2, and the output shaft of the electric telescopic rod 54 is fixed to one of the magnetic rods 53, and a scraper 55 is fixed to the end of the magnetic rod 53 away from the electric telescopic rod 54, and a material receiving platform 56 is fixed to the processing box 3 below the support frame 4, and the bottom of the scraper 55 is against the top of the material receiving platform 56;

[0047] During the specific operation, the hydraulic cylinder 2 is started by the controller, and the mounting frame 21 and the movable frame 25 are pushed to move inside the supporting chamber 11 by the ejection of the hydraulic cylinder 2. The first motor 22 is driven to move synchronously by the mounting frame 21, and the movable roller 24 is driven to move inside the adjusting groove 23 by the movable frame 25. At the same time, the first motor 22 can synchronously drive the movable roller 24 to move inside the adjusting groove 23, so that the movable roller 24 moves inside the grinding chamber 13, and then the distance between the movable roller 24 and the fixed roller 14 is adjusted, and then the first motor 22 and the second motor 34 are started by the controller;

[0048] The transmission shaft 35 meshing with the gear thereof is driven to rotate by the second motor 34, and the crushing roller 36 is driven to rotate by the transmission shaft 35, and then the prepared cement clinker is transported into the interior of the processing box 3 through the feed trough 32. After the cement clinker enters the interior of the processing box 3, the cement clinker with the particle size meeting the standard will pass through the filter hole at the bottom of the pre-grinding chamber 33 and fall to the top of the receiving plate 41, and then pass through the receiving plate 41 and fall to the top of the receiving platform 56, while the cement clinker with the particle size not meeting the standard will be intercepted in the pre-grinding chamber 33, and the cement clinker not meeting the standard will be pre-grinded by the rotation and hammering of the crushing roller 36, so that the cement clinker transported to the interior of the processing box 3 has the particle size meeting the standard, and all pass through the pre-grinding chamber 33 to enter the horizontal part of the inner cavity of the processing box 3, and finally be concentrated on the top of the receiving platform 56;

[0049] Specifically, when the gear transmission shaft 35 of the second motor 34 rotates, one end of the transmission shaft 35 is connected to the gearbox 37, and the gearbox 37 is connected to the fixed roller 14, so that the transmission shaft 35 rotates while driving the fixed roller 14 to rotate synchronously, and under the control of the gearbox 37, the rotation speed of the fixed roller 14 is the same as the rotation speed of the movable roller 24;

[0050] After the cement clinker is pre-ground and piled on the top of the material receiving platform 56, the electric telescopic rod 54 is started by the controller, and the electric telescopic rod 54 is pushed out to drive the magnetic rod 53 to slide inside the limit frame 52, and the magnetic rod 53 is moved toward the material receiving platform 56. During the movement, the magnetic rod 53 drives the scraper 55 to move synchronously toward the material receiving platform 56. When the scraper 55 moves toward the material receiving platform 56, the inclined surface of the scraper 55 is inserted into the cement clinker, and then the electric telescopic rod 54 is controlled to continue to be pushed out until the scraper 55 is against the inner wall of the processing box 3. When the scraper 55 is against the inner wall of the processing box 3, the magnetic rod 53 is also inserted into the cement clinker on the top of the material receiving platform 56.

[0051] Since the cement clinker has been pre-grinded by the crushing roller 36, the large particles of cement clinker in the cement clinker are broken, and the original large particles of cement clinker inevitably contain iron impurities. After pre-grinding, the iron impurities and cement clinker are mixed together. When the magnetic bar 53 is inserted into the cement clinker, the iron impurities mixed in the cement clinker can be adsorbed, and then the electric telescopic rod 54 is controlled to return. During the return, the electric telescopic rod 54 drives the magnetic bar 53 to return synchronously, and the magnetic bar 53 drives the scraper 55 to return synchronously. During the return, the scraper 55 drives the cement clinker on the top of the receiving platform 56 to move toward the feed port 15 until the cement clinker leaves the receiving platform 56 and falls above the feed port 15, and then enters the inside of the grinding chamber 13 through the feed port 15;

[0052] After the cement clinker is pre-ground and iron-removed, it enters the grinding chamber 13 through the feed port 15, and is then squeezed by the fixed roller 14 and the movable roller 24, and finally forms a cake and accumulates at the bottom of the grinding chamber 13.

[0053] Furthermore, when the electric telescopic rod 54 returns, it drives the magnetic rod 53 and the scraper 55 to return synchronously, and the magnetic rod 53 passes through the limit frame 52 during the return process. Since the limit frame 52 and the magnetic rod 53 are slidably connected and fit each other, when the magnetic rod 53 adsorbed with iron impurities returns, the iron impurities on its surface are scraped off by the limit frame 52, so that the iron impurities fall into the interior of the collecting chamber 5.

[0054] Therefore, the controller can be used to control the repeated ejection and return of the electric telescopic rod 54, so that the magnetic bar 53 and the scraper 55 can be repeatedly moved on the top of the material receiving platform 56. When the scraper 55 and the magnetic bar 53 are ejected, the cement clinker on the top of the material receiving platform 56 can be deironed. During the return of the scraper 55 and the magnetic bar 53, the deironed cement clinker on the top of the material receiving platform 56 can be transported into the grinding chamber 13. At the same time, during the return of the magnetic bar 53, the iron impurities adsorbed on the surface of the magnetic bar 53 can be removed.

[0055] As a result, when the fixed roller 14 and the movable roller 24 are performing the final grinding, the influence of iron impurities on the fixed roller 14 and the movable roller 24 can be reduced, thereby reducing the probability of the surfaces of the fixed roller 14 and the movable roller 24 being damaged by iron impurities, and reducing the surface wear of the fixed roller 14 and the movable roller 24, thereby indirectly improving the quality and efficiency of the cement clinker grinding by the fixed roller 14 and the movable roller 24, and improving the output of the grinding of the present invention per unit time, reducing the probability of repeated grinding of cement clinker in the roller press body 1, and reducing the duration of repeated grinding of cement clinker, which will shorten the overall grinding time of cement clinker, so that the overall operating time of the roller press body 1 is reduced, and then reducing the power consumption of the roller press body 1, and then indirectly reducing the carbon emissions of the roller press body 1 in the cement preparation process;

[0056] At the same time, since the particle size of the cement clinker squeezed by the fixed roller 14 and the movable roller 24 is more uniform, the compliance rate is higher, thereby avoiding excessive vibration of the movable roller 24 and the fixed roller 14 due to excessive particle size of the cement clinker, resulting in system tripping, and further improving the efficiency of the cement grinding of the present invention;

[0057] Furthermore, when the electric telescopic rod 54 drives the magnetic rod 53 and the scraper 55 to move toward the material receiving platform 56 after being ejected, the top of the scraper 55 contacts the special-shaped plate 43 in turn, and the special-shaped plate 43 drives the receiving plate 41 to move up and down and shake after contacting the scraper 55. When the receiving plate 41 is displaced and shakes, the push rod 42 can be driven to move and shake synchronously. The push rod 42 is located below the pre-grinding chamber 33, and the number of push rods 42 is corresponding to the number of filter holes in the pre-grinding chamber 33. When the push rod 42 is displaced up and down, it can be pushed into the filter holes at the bottom of the pre-grinding chamber 33 and shake, thereby avoiding the accumulation and blockage of the pre-grinding chamber 33, and ensuring the smoothness of the material discharge after pre-grinding in the pre-grinding chamber 33.

[0058] At the same time, after reaching the standards, the cement clinker in the pre-grinding chamber 33 falls onto the top of the receiving plate 41 through the filtering holes. When the receiving plate 41 shakes, the discharge port 44 can be prevented from being blocked by the cement clinker, thereby ensuring the smoothness of the discharge of the discharge port 44 and ensuring that the pre-grinded cement clinker falls onto the top of the receiving platform 56 more quickly, thereby improving the efficiency of subsequent iron removal of the cement clinker and entering the grinding chamber 13 for final grinding, thereby improving the efficiency of cement clinker grinding.

[0059] It should be noted that a scattering classifier can be used inside the grinding chamber 13 to directly scatter and separate the material cake inside the grinding chamber 13, or the material cake can be transported out of the grinding chamber 13 and then scatter.

[0060] The support frame 4 is located in the horizontal part of the processing box 3, and the receiving plate 41 is located in the vertical part of the processing box 3. Therefore, after the special-shaped plate 43 contacts the scraper 55, the special-shaped plate 43 can only drive the receiving plate 41 to move in the vertical part of the processing box 3, that is, the receiving plate 41 can only move up and down along the vertical part of the processing box 3.

[0061] Embodiment 2:

[0062] The top of the limit frame 52 is internally slidably connected with multiple groups of observation rods 6, and the number of groups of observation rods 6 is consistent with the number of magnetic rods 53. A limit plate 61 is fixed to the top of the limit frame 52 near the electric telescopic rod 54. The internal thread of the limit plate 61 is connected with a screw 62. The number of screws 62 is consistent with the number of magnetic rods 53, and each magnetic rod 53 corresponds to a screw 62 and a group of observation rods 6. The bottom of the screw 62 is fixed with a bottom plate 63, and the bottom of the bottom plate 63 is fixed with a sponge grinding block 64, and the sponge grinding block 64 is located above the magnetic rod 53.

[0063] Specifically, after the present invention is used for a long time, the surface of the magnetic bar 53 will inevitably be oxidized and worn, which will affect the efficiency of iron removal. Therefore, the wear of the magnetic bar 53 can be observed by observing the state of the rod 6;

[0064] When the surface of the magnetic bar 53 is oxidized and worn, the surface of the magnetic bar 53 is in an uneven state. Since the observation rod 6 is slidably connected to the limit frame 52, and the bottom of the observation rod 6 is against the top of the magnetic bar 53, and the observation rod 6 is limited by the limit frame 52, it cannot move horizontally. When the magnetic bar 53 passes through the limit frame 52, when the uneven surface of the magnetic bar 53 passes the bottom of the observation rod 6, the concave part of the surface of the magnetic bar 53 will cause part of the observation rod 6 to sink.

[0065] When the staff observes that the observation rod 6 has sunk, they can find the corresponding screw 62 according to the corresponding magnetic rod 53, and then rotate the corresponding screw 62 to make the screw 62 rotate downward, so that the screw 62 drives the bottom plate 63 and the sponge grinding block 64 to rotate downward, so that the sponge grinding block 64 contacts the oxidized or worn magnetic rod 53, and the electric telescopic rod 54 drives the magnetic rod 53 to move repeatedly, so that the magnetic rod 53 can be repeatedly rubbed by the sponge grinding block 64, and then the sponge grinding block 64 can polish and grind the magnetic rod 53, and restore the oxidized and uneven parts of the magnetic rod 53 to a flat state, and then restore the magnetism of the magnetic rod 53, thereby ensuring the iron removal efficiency of the magnetic rod 53, and further reducing the influence of iron impurities in the cement clinker on the fixed roller 14 and the movable roller 24, thereby improving the efficiency of preparing cement according to the present invention.

[0066] It should be noted that the bottom of the observation rod 6 is spherical, which ensures that the magnetic bar 53 can move normally. At the same time, the observation rod 6 can fit on the surface of the magnetic bar 53 under the influence of gravity, thereby improving the accuracy of the observation rod 6 in displaying the surface flatness of the magnetic bar 53.

[0067] Embodiment three:

[0068] Slide rods 7 are slidably connected to the inside of the collecting chamber 5 on both sides, and a connecting plate 71 is fixed to one end of the slide rod 7 close to the electric telescopic rod 54. The two connecting plates 71 are respectively fixed to one of the magnetic bars 53. The horizontal part of the processing box 3 is located below the support frame 4 and a dust collecting chamber 8 is fixed thereto. A second sealing door 81 is hingedly connected to the side of the dust collecting chamber 8 away from the second motor 34. A spring 82 is fixed to the side of the dust collecting chamber 8 away from the collecting chamber 5. A rubber plate 83 is fixed to one end of the spring 82, and the rubber plate 83 is slidably connected to the dust collecting chamber 8.

[0069] An air inlet 84 is provided on the inner wall of the dust collecting chamber 8 near the collecting chamber 5, and slots 85 are provided on both sides of the inner wall of the dust collecting chamber 8 near the air inlet 84. An air inlet baffle 86 is hingedly connected to the inner wall of the dust collecting chamber 8 near the air inlet 84, and connecting rods 87 are fixed below the two ends of the air inlet baffle 86. A linkage baffle 88 is hingedly connected to the inner wall of the dust collecting chamber 8 near the slot 85, and the connecting rod 87 is fixed to the linkage baffle 88. An exhaust port 9 is provided on the inner wall of the dust collecting chamber 8 above the air inlet 84, and an exhaust baffle 91 is hingedly connected to the outer wall of the dust collecting chamber 8 near the collecting chamber 5.

[0070] Specifically, when the electric telescopic rod 54 starts to be ejected, it can drive the magnetic rod 53 to move toward the dust collecting chamber 8, and the magnetic rod 53 drives the connecting plate 71 to move toward the dust collecting chamber 8, and the connecting plate 71 drives the sliding rod 7 to move toward the dust collecting chamber 8. During the movement, the sliding rod 7 is inserted into the inside of the notch 85, abuts against the linkage baffle 88, and pushes the linkage baffle 88 to flip, so that one end of the sliding rod 7 enters the inside of the dust collecting chamber 8, and as the electric telescopic rod 54 continues to be ejected, one end of the sliding rod 7 contacts the rubber plate 83, and pushes the rubber plate 83 to move inside the dust collecting chamber 8;

[0071] During the turning process, the linkage baffle 88 drives the air inlet baffle 86 to turn synchronously through the connecting rod 87, so that the air inlet 84 is opened, and then the dust collecting chamber 8 is connected with the processing box 3. When the sliding rod 7 pushes the rubber plate 83 to move in the dust collecting chamber 8, it plays a role of exhausting air, so that the airflow in the processing box 3 is accelerated to flow toward the inside of the dust collecting chamber 8, and then the dust generated by the pre-grinding of the crushing roller 36 in the processing box 3 is sucked into the inside of the dust collecting chamber 8 along with the airflow, and then the dust is collected.

[0072] When the electric telescopic rod 54 returns, the magnetic rod 53 drives the connecting plate 71 to return synchronously, and the connecting plate 71 drives the sliding rod 7 to return. After the sliding rod 7 returns, the linkage baffle 88 drives the connecting rod 87 and the air inlet baffle 86 to close again to seal the air inlet 84, and the rubber plate 83 is reset under the action of the spring 82, ensuring that the rubber plate 83 can accept the next ejection movement of the sliding rod 7, and then when the electric telescopic rod 54 is repeatedly ejected and returned, the sliding rod 7 can drive the rubber plate 83 to be repeatedly ejected and reset, and then the inside of the dust collecting chamber 8 can repeatedly evacuate the processing box 3, so that the dust collecting chamber 8 can continuously collect the dust in the processing box 3.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing low-carbon cement, characterized in that: The following steps are involved: S1: According to the weight of cement produced according to construction requirements, select limestone and clay with corresponding proportions as the main raw materials, wherein the proportion of each raw material is limestone 70%±5%, clay 10%±5%, and then select an appropriate amount of slag fly ash 10%±5% according to construction requirements, and prepare cement raw materials through dry grinding and homogenization; S2: calcining the cement raw material in a mechanized vertical kiln to prepare cement clinker; S3: The prepared cement clinker is conveyed into the roller press, ground to the required particle size, and then proportioned by the clinker microcomputer batching system, so that natural gypsum and other mixed materials required for construction can be added to the cement clinker. The proportioned cement is homogenized, packaged by a packaging machine, and stored in a warehouse after packaging.

2. The method for preparing low-carbon cement according to claim 1, characterized in that: The roller press in S3 comprises a roller press body (1) and a controller, support compartments (11) are fixed on both sides of the roller press body (1), a disassembly door (12) is hingedly connected to the outside of the support compartment (11), a grinding chamber (13) is provided inside the roller press body (1), a fixed roller (14) is rotatably connected to the inside of the grinding chamber (13), a feed inlet (15) is provided on the top of the roller press body (1), the bottom of the grinding chamber (13) is inclined, and a material collection door (16) is hingedly connected to the outside of one side of the lower end of the grinding chamber (13); A hydraulic cylinder (2) is fixed to the inner wall of the two supporting compartments (11), and the hydraulic cylinder (2) is controlled by a controller. A mounting frame (21) is fixed to the outside of the output shaft of one of the hydraulic cylinders (2), and a first motor (22) is fixed to the inside of the mounting frame (21). The first motor (22) is controlled by the controller. An adjustment groove (23) is provided on the side of the roller press body (1) close to the mounting frame (21), and a movable roller (24) is slidably connected to the inside of the adjustment groove (23). The two ends of the movable roller (24) and the fixed roller (14) are respectively located inside the two supporting compartments (11), and a movable frame (25) is rotatably connected to the outside of one end of the movable roller (24) away from the mounting frame (21), and the movable frame (25) is fixed to the output shaft of a hydraulic cylinder (2) away from the mounting frame (21); A pre-grinding assembly is provided on the top of the roller press body (1), and the pre-grinding assembly is used to pre-grind cement clinker.

3. The method for preparing low-carbon cement according to claim 2, characterized in that: The pre-grinding assembly comprises a processing box (3), the bottom of the processing box (3) is fixed to the top of the roller press body (1), a box door (31) is fixed by bolts on one side of the processing box (3) close to the movable frame (25), a feed trough (32) is provided at the top of the vertical part of the processing box (3), a pre-grinding chamber (33) is provided at the bottom of the vertical part of the processing box (3), and a filter hole is provided at the bottom of the pre-grinding chamber (33); A bracket is installed on the outside of the processing box (3) near the mounting frame (21), and a second motor (34) is fixed inside the bracket. The second motor (34) is controlled by a controller, and the second motor (34) is composed of a driving motor and a gear. A transmission shaft (35) is rotatably connected to the inside of the processing box (3) near the second motor (34). A gear plate (351) is fixed to the outside of the transmission shaft (35), and the gear plate (351) is located on the outside of the processing box (3). A crushing roller (36) is clamped on the outside of one end of the transmission shaft (35) near the processing box (3), and the crushing roller (36) is located inside the pre-grinding chamber (33). A gearbox (37) is fixed inside the support box (11) near the mounting frame (21), and the fixed roller (14) is transmission-connected to the gearbox (37). The end of the transmission shaft (35) away from the processing box (3) is transmission-connected to the gearbox (37).

4. The method for preparing low-carbon cement according to claim 3, characterized in that: A support frame (4) is fixedly connected to the processing box (3) below the pre-grinding chamber (33), a material receiving plate (41) is clamped on the top of the support frame (4), a push rod (42) is fixed on the top of the material receiving plate (41), special-shaped plates (43) are fixed on both sides of the bottom of the material receiving plate (41), and a discharge port (44) is opened on the surface of the material receiving plate (41).

5. The method for preparing low-carbon cement according to claim 4, characterized in that: A collecting chamber (5) is fixed on one side of the horizontal part of the processing box (3) close to the hydraulic cylinder (2); a first sealing door (51) is fixed on one side of the collecting chamber (5) close to the box door (31) by bolts; a limiting frame (52) is fixed on the inner wall of the processing box (3) above the collecting chamber (5); a plurality of magnetic bars (53) are slidably connected inside the limiting frame (52); an electric telescopic rod (54) is fixed on the inner wall of the horizontal part of the processing box (3) close to the hydraulic cylinder (2); an output shaft of the electric telescopic rod (54) is fixed to one of the magnetic bars (53); a scraper (55) is fixed on one end of the magnetic bar (53) away from the electric telescopic rod (54); a material receiving platform (56) is fixed inside the processing box (3) below the support frame (4); the bottom of the scraper (55) abuts against the top of the material receiving platform (56).

6. The method for preparing low-carbon cement according to claim 5, characterized in that: The top of the limit frame (52) is internally slidably connected to a plurality of groups of observation rods (6), the number of groups of the observation rods (6) being the same as the number of magnetic rods (53), a limit plate (61) is fixed to the top of the limit frame (52) on one side close to the electric telescopic rod (54), the internal thread of the limit plate (61) is connected to a screw rod (62), the number of the screw rods (62) being the same as the number of magnetic rods (53), and each magnetic rod (53) corresponds to a screw rod (62) and a group of observation rods (6), a bottom plate (63) is fixed to the bottom of the screw rod (62), a sponge grinding block (64) is fixed to the bottom of the bottom plate (63), and the sponge grinding block (64) is located above the magnetic rod (53).

7. The method for preparing low-carbon cement according to claim 6, characterized in that: Sliding rods (7) are slidably connected to the inside of the two sides of the collecting chamber (5), and a connecting plate (71) is fixed to one end of the sliding rod (7) close to the electric telescopic rod (54), and the two connecting plates (71) are respectively fixed to one of the magnetic bars (53).

8. The method for preparing low-carbon cement according to claim 7, characterized in that: The horizontal portion of the processing box (3) is located below the support frame (4) and is fixed with a dust collecting chamber (8); a second sealing door (81) is hingedly connected to the side of the dust collecting chamber (8) away from the second motor (34); a spring (82) is fixed to the side of the dust collecting chamber (8) away from the collecting chamber (5); a rubber plate (83) is fixed to one end of the spring (82); the rubber plate (83) is slidably connected to the dust collecting chamber (8); and the inner portion of the dust collecting chamber (8) close to the collecting chamber (5) is provided with a spring (82). An air inlet (84) is provided on the wall, and slots (85) are provided on the inner wall of the dust collecting chamber (8) on both sides of the air inlet (84). An air inlet baffle (86) is hingedly connected to the inner wall of the dust collecting chamber (8) on the side close to the air inlet (84), and connecting rods (87) are fixed below the two ends of the air inlet baffle (86). A linkage baffle (88) is hingedly connected to the inner wall of the dust collecting chamber (8) on the side close to the slot (85), and the connecting rod (87) is fixed to the linkage baffle (88); An exhaust port (9) is provided on the inner wall of the dust collecting chamber (8) above the air inlet (84), and an exhaust baffle (91) is hingedly connected to one side of the outer wall of the dust collecting chamber (8) close to the collecting chamber (5).

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