Small-size-fraction limestone trial burning process for double-chamber kiln

Abstract

An analysis main body is mounted at the top of a kiln main body, a belt pulley is mounted at the top of the analysis main body, a driving motor is mounted on one side of the top of the analysis main body, and an air outlet is formed in the other side of the top of the analysis main body; an air inlet box is installed at the bottom of the kiln body, a supporting base is arranged at the bottom of the air inlet box, and a main shaft is rotationally installed on the inner side of the air inlet box. When the device is used for pulverizing, the main shaft rotates to drive the grinding roller hanging bracket to revolve, meanwhile, the gear ring structure is meshed with the crushing grinding roller to rotate, crushing and pulverizing are better carried out, and the gear ring is located at the top of the crushing grinding ring and extends inwards by a certain distance. And the thrown materials can be blocked under the action of the gear ring, so that the thrown materials are always located between the crushing grinding roller and the crushing grinding ring, and the practicability and the crushing efficiency of the device are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of trial firing technology, and in particular relates to a trial firing technology of small-grained limestone for a double-chamber kiln. Background Art

[0002] At present, the domestic iron and steel smelting industry is developing further. Active lime plays a very important role in the production process of iron and steel smelting. Its main function is slag desulfurization, which can effectively improve the quality of product steel. Active lime belongs to light-burned lime in type. Compared with other ordinary lime, this kind of lime has higher porosity and relatively small volume density. Therefore, it can react more effectively in the process of iron and steel smelting to achieve higher steel production efficiency. At present, various domestic vertical kilns usually require that the particle size of limestone raw materials entering the kiln is greater than 40mm. Some domestic lime companies have carried out research on the use of small-particle limestone as a flux raw material, but usually use rotary kiln calcination to process small-particle limestone. There is no mature calcination process and experience for vertical kiln production. Recycling and efficient use of small-particle limestone abandoned in the existing production process is not only an effective means for enterprises to reduce costs and increase efficiency, but also an important measure to improve resource utilization.

[0003] A Raymond mill is disclosed in the patent with application number 202121752599.6. In this application, a driving motor is directly connected to the main shaft through a coupling, and the main shaft is directly driven to rotate by the driving motor. The speed of the driving motor is directly the speed of the main shaft of the Raymond mill, and there is no intermediate deceleration and acceleration process, thereby reducing transmission loss, reducing energy consumption, and improving transmission efficiency. The overall structure is more compact, occupies a small area, and saves space. In response to the above application, combined with the existing limestone trial burning processing technology, in the existing limestone processing process, the limestone after trial burning usually needs to be powdered, and the existing Raymond mill is used for powdering. However, when the existing Raymond mill is in use, the limestone entering the equipment is thrown up by a shovel, and then crushed and powdered by the crushing grinding roller and the crushing grinding ring. However, during the throwing process, if the height of the limestone is thrown up too high, it is easy to cause the limestone to fly out of the crushing area, thereby affecting the powdering efficiency and the practicality of the device. For this reason, we propose a small-grained limestone trial burning process for double-chamber kilns. Summary of the invention

[0004] The purpose of the present invention is to provide a trial burning process for small-particle limestone for a double-chamber kiln, so as to solve the problem raised in the above background technology that in the existing limestone processing process, the limestone after trial burning usually needs to be powdered, and the existing Raymond mill is used for powdering. However, when the existing Raymond mill is in use, the limestone entering the equipment is thrown up by a shovel, and then crushed and powdered by a crushing grinding roller and a crushing grinding ring. However, during the throwing process, if the height of the limestone is thrown up too high, it is easy to cause the limestone to fly out of the crushing zone, thereby affecting the powdering efficiency and the practicability of the device.

[0005] To achieve the above object, the present invention provides the following technical solution: a trial burning process of small-sized limestone for a double-chamber kiln, specifically comprising the following steps;

[0006] S1. Crushing of raw limestone: The large limestone blocks obtained by mining are evenly fed through a vibrating feeder and transported to a jaw crusher for coarse crushing. The coarsely crushed materials are screened by a vibrating screen and then transported by a belt conveyor to the next stage impact crusher for medium and fine crushing. After multiple crushing and screening, limestone particles of appropriate size are obtained;

[0007] S2, washing: washing the crushed and screened limestone particles with water, which is completed by a sand washer to remove dirt, dust and impurities, and then filtering again;

[0008] S3, trial firing; in order to ensure the stable operation of the lime kiln equipment during the trial firing, the pressure in the double-chamber kiln is controlled to be stable. After preliminary investigation of actual production experience, the "sandwich" feeding method is selected, that is, two layers of larger-sized limestone sandwiched by a layer of smaller-sized limestone. Subsequently, other raw material structures entering the kiln, such as direct mixed feeding, and calcination effects are verified. The raw materials with larger and smaller sizes are fed into the kiln for calcination in a ratio of 4:1; 3:1; 2:1 respectively;

[0009] S4, powder making: the limestone product obtained by the trial burning is lifted by a bucket elevator and input into the silo, and then fed by the silo and sent into the interior of the kiln body through the feed drop bucket, and is crushed and powdered by the kiln body. The obtained powder is blown out by a winnowing machine and collected by a powder collector.

[0010] Preferably, an analysis body is installed on the top of the kiln body, a pulley is installed on the top of the analysis body, a driving motor is installed on one side of the top of the analysis body, an air outlet is opened on the other side of the top of the analysis body, an air inlet box is installed on the bottom of the kiln body, a supporting base is provided at the bottom of the air inlet box, a main shaft is rotatably installed on the inner side of the air inlet box, a scraper is fixedly installed on the bottom of the main shaft, a grinding roller hanger is fixedly installed at the top edge of the main shaft, a crushing grinding roller is installed on the bottom of the grinding roller hanger, a crushing grinding ring is also installed on the inner top of the air inlet box, a material blocking assembly is provided on the inner side of the kiln body at the top of the crushing grinding ring, and the material blocking assembly includes a gear ring fixed on the top of the crushing grinding ring.

[0011] Preferably, a meshing gear is fixedly installed on the top of the crushing grinding roller, a scraper limiting seat is fixedly installed on the top of the meshing gear, a scraper fixing seat is provided at one end of the scraper limiting seat, and the scraper limiting seat is fixedly installed on the meshing gear through the scraper fixing seat.

[0012] Preferably, the crushing roller revolves while meshing with the gear ring through the meshing gear, and the gear ring protrudes inwardly.

[0013] Preferably, a lifting limit block is installed on the inner side of the scraper limit seat, a lifting limit plate is fixedly installed on the lifting limit block, limiting rods are fixedly installed on both ends of the inner side of the scraper limit seat, and the lifting limit block and the scraper limit seat are limited in movement by the lifting limit plate, and the limiting rod passes through the lifting limit plate, and a return spring is arranged on the limiting rod at the top of the lifting limit plate.

[0014] Preferably, an integrated scraper fixing plate is provided at the bottom of the lifting limit block, and a wear-resistant scraper plate is fixedly installed at the bottom of the scraper fixing plate.

[0015] Preferably, a driving box is fixedly installed on the inner top of the kiln body, a grading cover is installed on the bottom of the driving box, and the grading cover includes a grading inner cover and a grading outer cover, and a rotatable reverse shaft is installed through the driving box, the pulley is fixed on the top of the reverse shaft, and a gear 1 is fixedly installed on the reverse shaft on the inner side of the driving box, a forward shaft sleeve is rotatably installed on the bottom of the driving box, and a gear 2 is fixedly installed on the top of the forward shaft sleeve located on the inner side of the driving box.

[0016] Preferably, the gear 1, the transmission wheel and the gear 2 are assembled by meshing, and the grading inner cover is fixed to the bottom of the forward shaft sleeve, and the grading outer cover is fixed to the bottom of the reverse shaft rod. The grading inner cover and the grading outer cover are driven to rotate by the forward shaft sleeve and the reverse shaft rod, and the rotation directions of the grading inner cover and the grading outer cover are opposite.

[0017] Preferably, a feed hopper is provided at the bottom of one side of the kiln body, a feed shaft is installed on the inner side of the feed hopper, a feed blade is fixedly installed on the feed shaft, and a feed motor for driving is also installed on the front surface of the feed hopper at the end of the feed shaft.

[0018] Preferably, a support ring seat is fixedly mounted on the main shaft, a hanger ring is fixedly mounted on the edge of the support ring seat, and the hanger ring sleeve is fixed on the grinding roller hanger.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) By setting a gear ring structure inside the Raymond mill for milling, when the device is used for milling, the main shaft rotates to drive the roller hanger to revolve, and the gear ring structure can be used to mesh with the crushing roller to rotate, so as to better carry out crushing and milling. The gear ring is located at the top of the crushing ring and extends inward for a certain distance. When the device is working, the gear ring can block the thrown materials, so that the thrown materials are always between the crushing roller and the crushing ring, so as to avoid the materials flying out of the crushing ring and reduce the crushing efficiency, thereby improving the practicability and crushing efficiency of the device;

[0021] (2) At the same time, during the use of the device, when the material enters and the material dropped by the wind selection is easy to fall on the gear ring, thus affecting the falling of the material. By setting a scraping structure on the crushing roller, the scraping limit seat can be driven to rotate while the crushing roller rotates, thereby scraping off the crushed material falling on the gear ring, avoiding the residual material affecting the crushing effect, so as to better use the crushed material;

[0022] (3) In the process of scraping, long-term contact wear can easily cause the wear-resistant scraper to be worn to a certain extent. The wear will cause the wear-resistant scraper to be unable to contact with the gear ring, thereby affecting the use of scraping. By providing an elastic compensation structure on the scraper limit seat, when the device is used for scraping, the elastic compensation structure can always ensure that the wear-resistant scraper is in contact with the gear ring, so that the material falling on the gear ring can be better scraped off, thereby improving the practicality of the device;

[0023] (4) At the same time, when the material is air-selected after being crushed, some small particles are easily discharged from the air outlet as the air is selected. By setting up a bidirectional rotating classification cover, the classification cover structure that rotates in the opposite direction during air selection can better screen the small particles during air selection and prevent the small particles from flying out, thereby improving the practicality of the device. In addition, a feed blade is also provided at the feed inlet. During feeding, the feed blade can ensure that the material enters evenly while preventing the gas from being thrown out from the feed inlet during air selection, thereby improving the practicality and functionality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 It is a schematic diagram of the top view of the gear ring of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the scraper limiting seat of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the grading cover of the present invention;

[0028] Figure 5 It is a schematic diagram of the top view of the supporting ring seat of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the feed drop bucket of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the trial burning test process of the present invention;

[0031] Figure 8 This is a schematic diagram of the use and effect of small-particle raw materials of the present invention;

[0032] Fig. 9 This is a schematic diagram of the main quality indicators of the product of the present invention;

[0033] Fig.10 This is a schematic diagram of CaO content / % of the present invention;

[0034] Fig.11 This is a schematic diagram of the activity / ml of the present invention;

[0035] Fig.12 Schematic diagram of SiO2 content / % of the present invention;

[0036] Fig.13 This is a schematic diagram of the loss on ignition / % of the present invention;

[0037] In the figure: 100, kiln body; 101, analysis body; 102, air inlet box; 103, base; 104, drive motor; 105, pulley; 106, air outlet; 107, feed drop bucket; 108, main shaft; 109, grinding roller hanger; 110, crushing grinding roller; 111, crushing grinding ring; 112, scraper; 200, gear ring; 201, meshing gear; 202, scraper limit seat; 203, scraper fixed seat; 204, lifting limit block; 205, lifting limit plate; 206, limit rod; 207, return spring; 208, scraper fixing plate; 209, wear-resistant scraper; 300, grading cover; 301, drive box; 302, forward shaft sleeve; 303, reverse shaft rod; 304, gear one; 305, gear two; 306, transmission wheel; 307, grading inner cover; 308, grading outer cover; 400, hanger ring; 401, support ring seat; 500, feed shaft rod; 501, feed blade. DETAILED DESCRIPTION

[0038] 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.

[0039] Example 1

[0040] See also Figure 1-Figure 7 , the present invention provides a technical solution: a trial burning process of small-sized limestone for a double-chamber kiln, specifically comprising the following steps;

[0041] S1. Crushing of raw limestone: The large limestone blocks obtained by mining are evenly fed through a vibrating feeder and transported to a jaw crusher for coarse crushing. The coarsely crushed materials are screened by a vibrating screen and then transported by a belt conveyor to the next stage impact crusher for medium and fine crushing. After multiple crushing and screening, limestone particles of appropriate size are obtained;

[0042] S2, washing: washing the crushed and screened limestone particles with water, which is completed by a sand washer to remove dirt, dust and impurities, and then filtering again;

[0043] S3, trial firing; in order to ensure the stable operation of the lime kiln equipment during the trial firing, the pressure in the double-chamber kiln is controlled to be stable. After preliminary investigation of actual production experience, the "sandwich" feeding method is selected, that is, two layers of larger-sized limestone sandwiched by a layer of smaller-sized limestone. Subsequently, other raw material structures entering the kiln, such as direct mixed feeding, and calcination effects are verified. The raw materials with larger and smaller sizes are fed into the kiln for calcination in a ratio of 4:1; 3:1; 2:1 respectively;

[0044] refer to Figure 8-13 The trial burnt finished products were nearly 5,500 tons. The average calcium oxide content of all finished products in the trial burnt stage was 88.5%, the average activity was 312ml, and the loss on ignition was 8.9%. There is a certain gap with the project target of calcium oxide content ≥87%, loss on ignition ≤5%, and activity ≥320ml. The lime quality in the early stage of the trial burnt was poor and seriously did not meet the lime quality requirements;

[0045] Through process adjustment, the product quality on May 20 was good. According to the indicators of CaO content, product activity and lime loss on ignition of the experimental product on May 20, which were better than those of the experimental products on other dates, it was shown that the process parameters on May 20 in the trial firing experiment in this stage were suitable for limestone calcination with a ratio of 2:1 between large and small particle size raw materials entering the kiln.

[0046] S4, powder making; the limestone product obtained by the trial burning is lifted by the bucket elevator and input into the silo, and then fed by the silo and sent into the interior of the kiln body 100 through the feed drop bucket 107, and is crushed and powdered by the kiln body 100. The obtained powder is blown out by the air separator and collected by the powder collector.

[0047] Example 2

[0048] See also Figure 1-Figure 6The present invention provides a technical solution: a trial burning process of small-sized limestone for a double-chamber kiln. The trial burning process of small-sized limestone mainly involves calcining limestone with a small particle size, such as less than 10 mm, to produce active lime. This process is widely used in steelmaking, chemical industry and other fields, because active lime can be quickly dissolved in these fields and has a faster slag forming speed, which plays an important role in improving production efficiency and quality. An analysis body 101 is installed on the top of the kiln main body 100, a pulley 105 is installed on the top of the analysis body 101, a driving motor 104 is installed on one side of the top of the analysis body 101, and an air outlet 106 is opened on the other side of the top of the analysis body 101. An air inlet box 102 is installed at the bottom of the kiln main body 100, and a supporting base 103 is arranged at the bottom of the air inlet box 102. A main shaft 108 is rotatably installed on the inner side of the air inlet box 102, and a scraper 112 is fixedly installed at the bottom of the main shaft 108. The top edge of the main shaft 108 A grinding roller hanger 109 is fixedly installed, a crushing grinding roller 110 is installed at the bottom of the grinding roller hanger 109, a crushing grinding ring 111 is also installed on the inner top of the air inlet box 102, and a material blocking assembly is arranged on the inner side of the kiln body 100 at the top of the crushing grinding ring 111, and the material blocking assembly includes a gear ring 200 fixed on the top of the crushing grinding ring 111. In the small-sized limestone trial burning process, when the Raymond mill in the application is used for crushing and powdering, the stone after trial burning is The limestone enters the interior of the kiln body 100 through the feed hopper 107, and then the main shaft 108 is driven to rotate by the motor. When the main shaft 108 rotates, it drives the grinding roller hanger 109 to rotate, and is crushed by the crushing grinding roller 110 and the crushing grinding ring 111 installed at the end of the grinding roller hanger 109. While crushing, the wind generated by the fan enters from the air inlet box 102, and the limestone crushed into powder is blown out from the air outlet 106 through air selection, and the lime powder is filtered and recovered through the recovery device.

[0049] Specifically, a meshing gear 201 is fixedly installed on the top of the crushing grinding roller 110, a scraper limiting seat 202 is fixedly installed on the top of the meshing gear 201, a scraper fixing seat 203 is fixedly installed on one end of the scraper limiting seat 202, and the scraper limiting seat 202 is fixedly installed on the meshing gear 201 through the scraper fixing seat 203. While the crushing grinding roller 110 revolves, it also meshes with the gear ring 200 through the meshing gear 201, and the gear ring 200 extends inwardly and protrudes, and the protruding gear ring 200 acts as a stop. When the device is used, while the grinding roller hanger 109 revolves, the meshing gear 201 arranged on the top of the crushing grinding roller 110 also meshes with the gear ring 200 for self-rotation. At the same time, the gear ring 200 extends inward for a certain distance. Through the protruding gear ring 200, when the scraper 112 rotates to throw up the limestone entering the kiln body 100, the limestone can be prevented from being thrown up too high, and the thrown limestone is placed between the crushing grinding roller 110 and the crushing grinding ring 111 for crushing, thereby being better crushed.

[0050] Example 3

[0051] See also Figure 1-Figure 6 The present invention provides a technical solution: a trial burning process of small-grained limestone for a double-chamber kiln, a lifting limit block 204 is fixedly installed on the inner side of the scraper limit seat 202, a lifting limit plate 205 is fixedly installed on the lifting limit block 204, and limiting rods 206 are fixedly installed at both ends of the inner side of the scraper limit seat 202, and the lifting limit block 204 and the scraper limit seat 202 are limited to move by the lifting limit plate 205, and the limiting rod 206 penetrates the lifting limit plate 205, and a return spring 207 is arranged on the limiting rod 206 at the top of the lifting limit plate 205, and an integrated scraper fixing plate 208 is arranged at the bottom of the lifting limit block 204, and a wear-resistant scraper plate 209 is fixedly installed at the bottom of the scraper fixing plate 208. When limestone falls from the feed drop bucket 107 and large-grained limestone is filtered and falls by the grading cover 300, in order to prevent the limestone from falling on the raised gear ring 200, the scraper fixing plate 209 is fixedly installed at the bottom of the scraper fixing plate 208. When the crushing grinding roller 110 rotates, it will also drive the scraper limit seat 202 to rotate synchronously. The scraper limit seat 202 is fixed on the crushing grinding roller 110 through the scraper fixing seat 203. The rotating scraper limit seat 202 can contact the upper surface of the gear ring 200 through the installed wear-resistant scraper plate 209. The limestone particles that fall on the gear ring 200 can be scraped off by the rotating scraper limit seat 202. In order to prevent the wear-resistant scraper plate 209 from being unable to contact the upper surface of the gear ring 200 due to long-term contact wear during use, a limit rod 206 and a return spring 207 are also provided on the inner side of the scraper limit seat 202. The elastic force provided by the return spring 207 can always keep the bottom of the wear-resistant scraper plate 209 in contact with the upper surface of the gear ring 200, avoiding wear after a period of use that affects material scraping, thereby better crushing and use, further improving the practicability of the device.

[0052] Example 4

[0053] See also Figure 1-Figure 6The present invention provides a technical solution: a trial burning process of small-sized limestone for a double-chamber kiln, a driving box 301 is fixedly installed on the inner top of the kiln body 100, a grading cover 300 is installed on the bottom of the driving box 301, and the grading cover 300 includes a grading inner cover 307 and a grading outer cover 308, and a rotatable reverse shaft rod 303 is installed through the driving box 301, a pulley 105 is fixed on the top of the reverse shaft rod 303, a gear 1 304 is fixedly installed on the reverse shaft rod 303 on the inner side of the driving box 301, a forward shaft sleeve 302 is rotatably installed on the bottom of the driving box 301, and a gear 2 305 is fixedly installed on the top of the forward shaft sleeve 302 on the inner side of the driving box 301, the gear 1 304, the transmission wheel 306 and the gear 2 305 are assembled by meshing, and the grading inner cover 307 is fixed on the bottom of the forward shaft sleeve 302, and the grading outer cover 308 is fixed on At the bottom of the reverse shaft 303, the grading inner cover 307 and the grading outer cover 308 are driven to rotate through the forward sleeve 302 and the reverse shaft 303, and the rotation directions of the grading inner cover 307 and the grading outer cover 308 are opposite. When the crushed material is lifted to the grading cover 300 after being screened by air selection, the reverse shaft 303 will also rotate during operation and drive the grading outer cover 308 to rotate. At the same time, when the reverse shaft 303 rotates, the gear 2 305 is driven to rotate in the opposite direction through the meshing structure arranged on the inner side of the driving box 301. When the gear 2 305 rotates, it drives the forward sleeve 302 and the grading inner cover 307 to rotate synchronously, so that the grading inner cover 307 and the grading outer cover 308 rotate in opposite directions. During air selection, larger particles in the gas during the air selection process can be better screened out and returned to the kiln body 100 for re-crushing, thereby improving the practicality of the device.

[0054] Specifically, a feed hopper 107 is provided at the bottom of one side of the kiln body 100, and a feed shaft 500 is installed on the inner side of the feed hopper 107. A feed blade 501 is fixedly installed on the feed shaft 500. At the same time, a feed motor for driving is also installed on the front surface of the feed hopper 107 at the end of the feed shaft 500. When limestone enters from the feed hopper 107, the working motor installed on one side of the feed hopper 107 will drive the feed shaft 500 to rotate. The rotation of the feed shaft 500 will also drive the feed blade 501 to rotate. The rotating feed blade 501 can ensure uniform feeding and prevent gas from being blown out from the feed hopper 107 during air selection, thereby avoiding dust dispersion, thereby improving the functionality and practicality of the device.

[0055] Specifically, a support ring seat 401 is fixedly installed on the main shaft 108, and a hanger ring 400 is fixedly installed on the edge of the support ring seat 401, and the hanger ring 400 is fixedly mounted on the grinding roller hanger 109. When the main shaft 108 drives the grinding roller hanger 109 to rotate during crushing, in order to ensure the stability of the grinding roller hanger 109 and prevent the grinding roller hanger 109 from shaking and generating certain noise, the hanger ring 400 and the support ring seat 401 are provided to strengthen the support, so as to better ensure the stability of the grinding roller hanger 109 and avoid structural instability of the grinding roller hanger 109 during crushing.

[0056] 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 trial firing process of small-sized limestone in a double-chamber kiln, characterized in that: Specifically include the following steps: S1, raw material limestone crushing; The large limestone blocks obtained by mining are evenly fed through a vibrating feeder and transported to a jaw crusher for coarse crushing. The coarsely crushed materials are screened by a vibrating screen and then transported by a belt conveyor to the next stage impact crusher for medium and fine crushing. After multiple crushing and screening, limestone particles of appropriate size are obtained; S2, washing; The crushed and screened limestone particles are washed with water by a sand washer to remove dirt, dust and impurities, and then filtered again; S3, trial firing; in order to ensure the stable operation of the lime kiln equipment during the trial firing, the pressure in the double-chamber kiln is controlled to be stable. After preliminary investigation of actual production experience, the "sandwich" feeding method is selected, that is, two layers of larger-sized limestone sandwiched with a layer of smaller-sized limestone. Subsequently, other raw material structures entering the kiln, such as direct mixed feeding, and calcination effects are verified, with the ratio of large and small-sized raw materials being 4:1; 3:1; 2:1 calcined in kiln; S4, powder making; the limestone product obtained by the trial burning is lifted by a bucket elevator and input into a silo, and then fed by the silo and sent into the interior of the kiln body (100) through a feed drop bucket (107), and is crushed and powdered by the kiln body (100). The obtained powder is blown out by a wind separator and collected by a powder collector.

2. The small-grain limestone trial firing process for a double-chamber kiln according to claim 1, characterized in that: An analysis body (101) is installed on the top of the kiln body (100), a pulley (105) is installed on the top of the analysis body (101), a driving motor (104) is installed on one side of the top of the analysis body (101), an air outlet (106) is opened on the other side of the top of the analysis body (101), an air inlet box (102) is installed on the bottom of the kiln body (100), a supporting base (103) is provided at the bottom of the air inlet box (102), a main shaft (103) is rotatably installed on the inner side of the air inlet box (102), and a main shaft (104) is installed on the inner side of the main shaft (102). 8), a scraper (112) is fixedly mounted on the bottom of the main shaft (108), a grinding roller hanger (109) is fixedly mounted on the top edge of the main shaft (108), a crushing grinding roller (110) is mounted on the bottom of the grinding roller hanger (109), a crushing grinding ring (111) is also mounted on the inner top of the air inlet box (102), a material blocking assembly is arranged on the inner side of the kiln body (100) at the top of the crushing grinding ring (111), and the material blocking assembly includes a gear ring (200) fixed on the top of the crushing grinding ring (111).

3. The small-grain limestone trial firing process for a double-chamber kiln according to claim 2, characterized in that: A meshing gear (201) is fixedly mounted on the top of the crushing grinding roller (110), a scraper limiting seat (202) is fixedly mounted on the top of the meshing gear (201), a scraper fixing seat (203) is provided at one end of the scraper limiting seat (202), and the scraper limiting seat (202) is fixedly mounted on the meshing gear (201) via the scraper fixing seat (203).

4. The small-grain limestone trial firing process for a double-chamber kiln according to claim 3 is characterized in that: While the crushing roller (110) is revolving, it is also meshed with the gear ring (200) through the meshing gear (201) and rotates, and the gear ring (200) extends and protrudes inward.

5. The small-grain limestone trial firing process for a double-chamber kiln according to claim 4, characterized in that: A lifting limit block (204) is installed on the inner side of the scraper limit seat (202), and a lifting limit plate (205) is fixedly installed on the lifting limit block (204). Limit rods (206) are fixedly installed on both ends of the inner side of the scraper limit seat (202), and the lifting limit block (204) and the scraper limit seat (202) are limited in movement by the lifting limit plate (205). At the same time, the limit rod (206) passes through the lifting limit plate (205), and a return spring (207) is arranged on the limit rod (206) at the top of the lifting limit plate (205).

6. The small-grain limestone trial firing process for a double-chamber kiln according to claim 5, characterized in that: An integrated scraper fixing plate (208) is provided at the bottom of the lifting limit block (204), and a wear-resistant scraper plate (209) is fixedly installed at the bottom of the scraper fixing plate (208).

7. The small-grain limestone trial firing process for a double-chamber kiln according to claim 2, characterized in that: A driving box (301) is fixedly installed on the inner top of the kiln body (100), a grading cover (300) is installed on the bottom of the driving box (301), and the grading cover (300) includes a grading inner cover (307) and a grading outer cover (308), and a rotatable reverse shaft (303) is installed through the driving box (301), the pulley (105) is fixed on the top of the reverse shaft (303), a gear one (304) is fixedly installed on the reverse shaft (303) and located on the inner side of the driving box (301), a forward shaft sleeve (302) is rotatably installed on the bottom of the driving box (301), and a gear two (305) is fixedly installed on the top of the forward shaft sleeve (302) and located on the inner side of the driving box (301).

8. The small-grain limestone trial firing process for a double-chamber kiln according to claim 7, characterized in that: The gear 1 (304), the transmission wheel (306) and the gear 2 (305) are assembled by meshing, and the grading inner cover (307) is fixed to the bottom of the forward shaft sleeve (302), and the grading outer cover (308) is fixed to the bottom of the reverse shaft rod (303). The grading inner cover (307) and the grading outer cover (308) are driven to rotate by the forward shaft sleeve (302) and the reverse shaft rod (303), and the grading inner cover (307) and the grading outer cover (308) rotate in opposite directions.

9. The small-grain limestone trial firing process for a double-chamber kiln according to claim 2, characterized in that: A feed hopper (107) is provided at the bottom of one side of the kiln body (100), a feed shaft (500) is installed on the inner side of the feed hopper (107), a feed blade (501) is fixedly installed on the feed shaft (500), and a feed motor for driving is also installed at the end of the feed shaft (500) on the front surface of the feed hopper (107).

10. The small-grain limestone trial firing process for a double-chamber kiln according to claim 2, characterized in that: A support ring seat (401) is fixedly mounted on the main shaft (108), a hanger ring (400) is fixedly mounted on the edge of the support ring seat (401), and the hanger ring (400) is fixedly mounted on the grinding roller hanger (109).

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