CN210386128U - Grinding device for improving expansion efficiency of calcium oxide expansion clinker - Google Patents
Grinding device for improving expansion efficiency of calcium oxide expansion clinker Download PDFInfo
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- CN210386128U CN210386128U CN201920616647.5U CN201920616647U CN210386128U CN 210386128 U CN210386128 U CN 210386128U CN 201920616647 U CN201920616647 U CN 201920616647U CN 210386128 U CN210386128 U CN 210386128U
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Abstract
The utility model discloses a grinding device for improving the expansion efficiency of calcium oxide expansion clinker. The grinding device of the utility model comprises a calcium oxide expanded clinker raw material bin, a roller press, a primary variable frequency powder concentrator, a vertical mill, a secondary variable frequency powder concentrator, a dust collector and a calcium oxide expanded clinker finished product bin; the roller press is respectively connected with the calcium oxide expansion clinker raw material bin and the first-stage variable frequency powder concentrator, the first-stage variable frequency powder concentrator is respectively connected with the vertical mill and the dust collector, the second-stage variable frequency powder concentrator is respectively connected with the vertical mill and the dust collector, and the dust collector is connected with the calcium oxide expansion clinker finished product bin. Utilize grinding device handles calcium oxide inflation grog, has improved the granule particle size distribution of calcium oxide inflation grog powder, has avoided the excessive grinding phenomenon of calcium oxide inflation grog at the grinding in-process, is showing the expansion efficiency who has promoted calcium oxide inflation grog powder.
Description
Technical Field
The utility model belongs to the technical field of building material concrete admixture, concretely relates to promote grinding device of calcium oxide inflation grog expansion efficiency.
Background
The crack control problem of concrete is one of the most important problems in building engineering, and the shrinkage-compensating concrete prepared by mixing the expanding agent is one of the main technical means for solving the shrinkage and cracking problems of concrete. The conventional expanding agents mainly comprise a sulphoaluminate expanding agent, a calcium oxide expanding agent and a magnesium oxide expanding agent, and the calcium oxide expanding agent has more and more important positions in engineering practice due to excellent performances such as high expansion efficiency, low wet curing requirement and the like. So far, there are many patent documents concerning calcium oxide swelling agents and methods for preparing the same, such as:
chinese patent publication No. CN102162244A discloses a method for preparing a concrete expansive agent. 40-80 wt% of limestone and 20-60 wt% of gypsum are ground together, and then calcined at 1300-1500 ℃ in a rotary kiln, and the calcined substance is mixed with 20-80 wt% of calcium sulphoaluminate cement clinker or alunite (calcined or not) according to the proportion of 20-80 wt%Calcined) or calcium aluminate cement clinker or a mixture thereof to a specific surface area of 150-2And/kg, preparing the concrete expanding agent. The concrete expanding agent only gives a specific surface area control index for controlling the fineness of a product, and does not clearly determine the particle size distribution requirement of the expanding agent particles.
Chinese patent publication No. CN103130437A discloses a method for preparing a concrete expansive agent. 40 to 80 weight percent of limestone, 20 to 60 weight percent of gypsum and 0.1 to 1.0 weight percent of alumina and/or aluminum sulfate of the total sum of the limestone and the gypsum are ground together, the expansion clinker is prepared by high-temperature calcination at 1300 to 1500 ℃ in a rotary kiln, and then the expansion clinker is ground together with calcium sulphoaluminate cement clinker, calcium stearate or/and triethanolamine to the specific surface area of 140-2And/kg, preparing the concrete expanding agent. The concrete expanding agent only gives a specific surface area control index for controlling the fineness of a product, and does not clearly determine the particle size distribution requirement of the expanding agent particles.
Chinese patent publication No. CN101774777A discloses a method for preparing a concrete expansive agent. Mixing limestone and composite mineralizer, grinding into raw material, calcining at 1100-1300 deg.C to obtain calcium oxide expanded clinker, mixing with dispersive carrier, grinding to specific surface area of 150-450m2And/kg, preparing the concrete expanding agent. The concrete expanding agent only gives a specific surface area control index for controlling the fineness of a product, and does not clearly determine the particle size distribution requirement of the expanding agent particles.
Chinese patent publication No. CN103496867A discloses a method for preparing a concrete expansive agent. 40-90 wt% of limestone, 5-50 wt% of anhydrite and 2-20 wt% of alumina are adopted, calcium oxide (quick lime) is used for replacing limestone with the weight not less than 20 wt% (20-100 wt%) to prepare raw material, the raw material is calcined at 1250-1450 ℃ in a rotary kiln, and then the calcined material is ground to 400m of specific surface area2And/kg, preparing the concrete expanding agent. The concrete expanding agent only gives a specific surface area control index for controlling the fineness of a product, and does not clearly determine the particle size distribution requirement of the expanding agent particles.
Chinese patent publication No. CN102838308A discloses a preparation method of a concrete expanding agent. Mixing 88-95 wt% of anhydrite, 4-8 wt% of coke and 1-4 wt% of iron powder, grinding to prepare raw materials, calcining the raw materials in a rotary kiln at the temperature of 1350-2/kg, or mixing and grinding the obtained expanded clinker with anhydrite and blast furnace slag to reach the specific surface area of 250-350m2And/kg, preparing the concrete expanding agent. The concrete expanding agent only gives a specific surface area control index for controlling the fineness of a product, and does not clearly determine the particle size distribution requirement of the expanding agent particles.
Chinese patent publication No. CN102674738A discloses a preparation method of a multifunctional anti-cracking admixture. Is prepared by grinding 25-40% of calcium oxide expansion clinker, 1-3% of dextrin and fly ash into 400m powder with a specific surface area of 200-2Per kg of concrete crack resistance additive. The concrete anti-cracking admixture only gives a specific surface area control index for controlling the fineness of a product, and does not clearly determine the particle size distribution requirement of the product.
The expansion agent is prepared by using calcium oxide expansion clinker as a main expansion component and gypsum, fly ash or other mixed materials as auxiliary expansion components and by adopting a common grinding mode, but the fineness of the expansion agent product only gives a specific surface area control index and does not clearly define the particle size distribution requirement of the expansion agent product. Although the above patent does not clearly indicate what kind of grinding equipment is used to grind the expanding agent to the specific surface area required by the product, the applicant found in the actual research that several domestic large-scale expanding agent production enterprises mostly use small-sized rotary kilns to calcine the calcium oxide expanded clinker due to the relation of the market capacity of the expanding agent product, and the calcium oxide expanded clinker is ground by a ball mill in cooperation with the small-sized rotary kilns. When the calcium oxide expanded clinker reaches the specified specific surface area, the over-grinding phenomenon is easy to occur, the content of fine powder particles with the particle size of less than 0.03mm is mostly between 30 and 40 percent, the content of medium particles with the particle size of 0.03 to 0.10mm is about 40 to 60 percent, and the content of large particles with the particle size of 0.10 to 0.15mm is about 10 to 20 percent. Meanwhile, the applicant finds in experimental research that the particle size distribution of the calcium oxide expanded clinker powder has close correlation with the self expansion performance, the hydration reaction rate of the calcium oxide expanded clinker powder with the particle size of 0-0.03mm is high, the early expansion is mostly consumed in the plastic stage of cement concrete and becomes ineffective expansion, and the effective expansion generated in the hardening stage of the concrete is small; the calcium oxide expansion clinker powder with the particle size of 0.03-0.10mm has the hydration reaction rate matched with the hydration of cement, and can generate larger effective expansion in the hardening stage of concrete; the calcium oxide expansive clinker powder with the particle size of 0.10-0.15mm has relatively slow hydration reaction rate and can generate larger expansion deformation in the hardening stage of concrete, but when the calcium oxide expansive clinker powder particles are too large, hydration products are easy to agglomerate in the concrete to form local expansion, so that structural damage is caused, and poor stability is caused. Therefore, if the effective expansion efficiency of the calcium oxide expanded clinker powder in the hardening stage of the concrete is to be improved, the calcium oxide expanded clinker powder is required to form a particle size distribution with a large middle part and small two ends.
The existing literature data of Chinese journals (Wang Danmin ' influence of particle grading on the performance of swelling agent ', ' influence of particle size distribution of swelling agent for concrete ' on swelling performance ', ' research on influence of particle composition of swelling agent on limited swelling rate ', ' analysis method of particle size of finished product of swelling agent and comparative research of test result ' of Wu Cui ' e, Li Zhen ' research on particle grading of swelling agent) also considers that the size of the particles of swelling agent has a close relation to the swelling performance, but the existing literature data of journals only gives the relation between the particle size of swelling agent screened under laboratory conditions and the swelling performance, does not have a specific preparation process, and cannot be applied to reasonable industrial production. The quality of the expanding agent is always the most concerned problem for researchers and production enterprises, and how to improve the effective expansion efficiency of the expanding agent to achieve the aim of low mixing efficiency is the thought and pursuit target of people.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects that the content of small particles of the fineness of the calcium oxide expanded clinker powder is more than a few, the early hydration is faster, the ineffective expansion consumed in the cement concrete plasticity stage is more than a few, and the effective expansion generated in the cement concrete hardening stage is less in the existing grinding process, the utility model provides a grinding device for improving the expansion efficiency of the calcium oxide expanded clinker.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a grinding device for improving the expansion efficiency of calcium oxide expansion clinker, which comprises a calcium oxide expansion clinker raw material bin, a roller press, a primary variable frequency powder concentrator, a vertical mill, a secondary variable frequency powder concentrator, a dust collector and a calcium oxide expansion clinker finished product bin;
the lower part of the roller press is provided with a screening device, a coarse particle discharge port and a fine particle discharge port, the coarse particle discharge port is positioned above the screening device, and the fine particle discharge port is positioned below the screening device;
the first-stage variable frequency powder concentrator is provided with a first-stage variable frequency powder concentrator feeding hole, a first-stage variable frequency powder concentrator fine powder discharging hole and a first-stage variable frequency powder concentrator coarse powder discharging hole;
the vertical mill is provided with a vertical mill feeding hole and a vertical mill discharging hole;
the second-stage frequency conversion powder concentrator is provided with a second-stage frequency conversion powder concentrator feeding hole, a second-stage frequency conversion powder concentrator fine powder discharging hole and a second-stage frequency conversion powder concentrator coarse powder discharging hole;
wherein a feed opening of the calcium oxide expansion clinker raw material bin arranged below the calcium oxide expansion clinker raw material bin is connected with a feeding opening of the roller press arranged above the roller press through a conveying device; the coarse particle discharge port of the roller press is connected with the feeding port of the roller press through conveying equipment, and the fine particle discharge port of the roller press is connected with the feeding port of the primary variable-frequency powder concentrator through the conveying equipment; the fine powder discharge port of the primary variable frequency powder concentrator is connected with the dust collector through conveying equipment, and the coarse powder discharge port of the primary variable frequency powder concentrator is connected with the feed port of the vertical mill through conveying equipment; the discharge hole of the vertical mill is connected with the feed hole of the secondary variable frequency powder concentrator through conveying equipment, the fine powder discharge hole of the secondary variable frequency powder concentrator is connected with the dust collector through conveying equipment, and the coarse powder discharge hole of the secondary variable frequency powder concentrator is connected with the feed hole of the vertical mill through conveying equipment; and a discharge hole of the dust collector below the dust collector is connected with a calcium oxide expanded clinker finished product bin through conveying equipment.
In the device, the lower part of the roller press is provided with a screening device which can screen and classify coarse and fine particles of the calcium oxide clinker which is extruded and pre-ground by the roller press.
In the device, the calcium oxide expanded clinker in the calcium oxide expanded clinker raw material bin is put into a roller press for pre-grinding treatment, and coarse particles with the particle size of more than or equal to 3mm are screened by a screening device and returned to the roller press for re-extrusion; the primary variable-frequency powder concentrator is used for conducting powder concentration treatment on fine particles with the particle size smaller than 3mm, wherein fine powder with the particle size smaller than or equal to 0.10mm is collected by a dust collector and then is directly sent into a calcium oxide expanded clinker powder storage bin for storage, and coarse powder with the particle size larger than 0.10mm is sent into a vertical mill for deep grinding; and (3) performing powder selection regulation and control treatment on the deeply ground calcium oxide expanded cooked powder by adopting a secondary variable frequency powder selector, returning coarse powder with the particle size larger than 0.10mm to the vertical grinding machine for continuous grinding, and directly sending fine powder with the particle size smaller than or equal to 0.10mm to a finished calcium oxide expanded cooked powder storage bin after being collected by a dust collector.
In the device, the fine powder of the calcium oxide expanded clinker with the grain diameter less than or equal to 0.10mm generated in the pre-grinding process and the fine powder of the calcium oxide expanded clinker with the grain diameter less than or equal to 0.10mm generated in the deep grinding process are timely sent into a storage bin for storage as part of the calcium oxide expanded clinker powder prepared by final grinding through the powder selection regulation and control treatment of the primary variable frequency powder selector and the secondary variable frequency powder selector, so that the over-grinding phenomenon is avoided, and the content of fine powder in the calcium oxide expanded clinker powder is remarkably reduced; the coarse particles of the calcium oxide expanded clinker with the particle size of more than or equal to 3mm generated in the pre-grinding process are returned to the roller press for extrusion pre-grinding again, the coarse particles of the calcium oxide expanded clinker with the particle size of more than 0.10mm generated in the deep grinding process are returned to the vertical mill for deep grinding again, the content of the coarse particles in the calcium oxide expanded clinker powder is effectively reduced, and the problem that the stability of the calcium oxide expanded clinker powder is poor due to the fact that the content of the coarse particles is higher is solved. The particle size distribution of the calcium oxide expanded clinker powder prepared by the grinding process is in a state of large middle and small two ends, wherein when the particle size distribution in each interval is calculated by the mass percentage of the residue on the screen, the particle size is controlled to be 0-0.03mm 10-20%, 0.03-0.10mm 70-80%, 0.10-0.15mm 5-10%, more than 0.15mm 0-5%.
Compared with the existing calcium oxide expansion clinker grinding process, the grinding device effectively avoids the over-grinding phenomenon of the calcium oxide expansion clinker in the grinding process, improves the particle size distribution of the calcium oxide expansion clinker powder, ensures that the particle size distribution of the calcium oxide expansion clinker powder forms a state of large in the middle and small at two ends, reduces the invalid expansion of the calcium oxide expansion clinker powder in the concrete plasticity stage on the premise of ensuring the stability of the calcium oxide expansion clinker powder, and improves the effective expansion of the calcium oxide expansion clinker powder in the concrete hardening stage. The utility model relates to a process flow is simple, only on the basis of current calcium oxide expansion grog basic performance, can improve the expansion efficiency of calcium oxide expansion grog powder through optimizing the grinding technology, has effectively reduced calcium oxide expansion grog's application cost, provides market competition for calcium oxide expansion grog's popularization and application, has apparent social economic benefits.
Drawings
Fig. 1 is a diagram of a grinding device for improving the expansion efficiency of calcium oxide expansion clinker.
In the figure: 1. a calcium oxide expanded clinker raw material bin; 11. a feed opening of a calcium oxide expansion clinker raw material bin; 2. a roll squeezer; 21. a feeding port of the roller press; 22. screening equipment; 23. a coarse particle discharge port; 24. a fine particle discharge port; 3. a first-stage variable frequency powder concentrator; 31. a feeding hole of a first-stage variable frequency powder concentrator; 32. a fine powder discharge port of a first-stage variable frequency powder concentrator; 33. a coarse powder discharge port of a primary variable frequency powder concentrator; 4. a vertical mill; 41. a feed inlet of a vertical mill; 42. a discharge port of the vertical mill; 5. a secondary variable frequency powder concentrator; 51. a feeding hole of the secondary variable frequency powder concentrator; 52. a fine powder discharge port of a secondary variable frequency powder concentrator; 53. a coarse powder discharge port of a secondary variable frequency powder concentrator; 6. a dust collector; 61. a discharge hole of the dust collector; 7. and a calcium oxide expansion clinker finished product warehouse.
Detailed Description
In order to make the contents of the present invention more obvious and understandable, the present invention will be further described below with reference to the accompanying drawings and the specific embodiments, but the present invention is not limited to the following embodiments. The raw material calcium oxide expansion clinker particles used in the utility model are commercially available in the market, and the calcium oxide expansion clinker particles used in the embodiment of the utility model come from Jiangsu Subot new materials GmbH.
A grinding device for improving the expansion efficiency of calcium oxide expansion clinker comprises a calcium oxide expansion clinker raw material bin 1, a roller press 2, a primary variable frequency powder concentrator 3, a vertical mill 4, a secondary variable frequency powder concentrator 5, a dust collector 6 and a calcium oxide expansion clinker finished product bin 7;
the lower part of the roller press 2 is provided with a screening device 22, a coarse particle discharge port 23 and a fine particle discharge port 24, the coarse particle discharge port 23 is positioned above the screening device 22, and the fine particle discharge port 24 is positioned below the screening device 22;
the first-stage frequency conversion powder concentrator 3 is provided with a first-stage frequency conversion powder concentrator feeding port (31), a first-stage frequency conversion powder concentrator fine powder discharging port 32 and a first-stage frequency conversion powder concentrator coarse powder discharging port 33;
a vertical mill feeding port 41 and a vertical mill discharging port 42 are arranged on the vertical mill 4;
the second-stage frequency conversion powder concentrator 5 is provided with a second-stage frequency conversion powder concentrator feed inlet 51, a second-stage frequency conversion powder concentrator fine powder discharge outlet 52 and a second-stage frequency conversion powder concentrator coarse powder discharge outlet 53;
wherein a feed opening 11 of the calcium oxide expansion clinker raw material bin arranged below the calcium oxide expansion clinker raw material bin 1 is connected with a feeding opening 21 of the roller press arranged above the roller press 2 through a conveying device; a coarse particle discharge port 23 of the roller press is connected with a feeding port 21 of the roller press through conveying equipment, and a fine particle discharge port 24 of the roller press is connected with a feeding port 31 of the primary variable-frequency powder concentrator through the conveying equipment; the fine powder discharge port 32 of the primary frequency conversion powder concentrator is connected with the dust collector 6 through conveying equipment, and the coarse powder discharge port 33 of the primary frequency conversion powder concentrator is connected with the feed port 41 of the vertical mill through conveying equipment; the discharge hole 42 of the vertical mill is connected with the feed hole 51 of the secondary frequency conversion powder concentrator through conveying equipment, the fine powder discharge hole 52 of the secondary frequency conversion powder concentrator is connected with the dust collector 6 through conveying equipment, and the coarse powder discharge hole 53 of the secondary frequency conversion powder concentrator is connected with the feed hole 41 of the vertical mill through conveying equipment; and a dust collector discharge hole 61 arranged below the dust collector 6 is connected with the calcium oxide expanded clinker finished product bin 7 through conveying equipment.
In the device, the screening device is arranged at the lower part of the roller press, and can screen and classify coarse and fine particles of the calcium oxide clinker which is extruded and pre-ground by the roller press.
The grinding process using the device comprises the following steps:
(1) putting the calcium oxide expanded clinker into a roller press for pre-grinding treatment, controlling the rotating speed of the roller press to be 1.4-1.6 m/s, and screening coarse particles with the particle size of more than or equal to 3mm by screening equipment after the calcium oxide expanded clinker is extruded by the roller press to return to the roller press for re-extrusion;
(2) selecting fine particles with the particle size of less than 3mm screened in the step (1) by adopting a first-stage variable frequency powder selecting machine, wherein fine powder with the particle size of less than or equal to 0.10mm is collected by a dust collector and then is directly sent into a calcium oxide expanded cooked material powder storage bin for storage, and coarse powder with the particle size of more than 0.10mm is sent into a vertical mill;
(3) feeding the coarse powder (the calcium oxide expansion clinker with the particle size larger than 0.10mm and smaller than 3 mm) separated in the step (2) into a vertical grinding machine for deep grinding, wherein the grinding disc pressure of the vertical grinding machine is controlled to be 750KN-850KN, and the grinding disc rotating speed is controlled to be 18r/min-22 r/min;
(4) and (3) performing powder selection regulation and control treatment on the calcium oxide expanded clinker powder subjected to deep grinding in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the particle size of more than or equal to 0.10mm to the vertical grinding machine for continuous grinding, and directly sending fine powder with the particle size of less than or equal to 0.10mm to a calcium oxide expanded clinker powder storage bin for storage after being collected by a dust collector.
Example 1
A grinding process for improving the expansion efficiency of calcium oxide expansion clinker comprises the following steps:
(1) putting the calcium oxide expanded clinker into a roller press for pre-grinding treatment, controlling the rotating speed of the roller press to be 1.4m/s, and screening coarse particles with the particle size of more than or equal to 3mm by screening equipment after the calcium oxide expanded clinker is extruded by the roller press, returning the coarse particles to the roller press for re-extrusion;
(2) selecting fine particles with the particle size of less than 3mm screened in the step (1) by adopting a first-stage variable frequency powder selecting machine, wherein fine powder with the particle size of less than or equal to 0.10mm is collected by a dust collector and then is directly sent into a calcium oxide expanded cooked material powder storage bin for storage, and coarse powder with the particle size of more than 0.10mm is sent into a vertical mill;
(3) feeding the coarse powder (the calcium oxide expansion clinker with the particle size of more than 0.10mm and less than 3 mm) separated in the step (2) into a vertical grinding machine for deep grinding, wherein the grinding disc pressure of the vertical grinding machine is controlled at 800KN, and the grinding disc rotating speed is controlled at 20 r/min;
(4) and (3) performing powder selection regulation and control treatment on the deeply ground calcium oxide expanded clinker powder in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the particle size of more than 0.10mm to the vertical grinding machine for continuous grinding, and directly sending fine powder with the particle size of less than or equal to 0.10mm to a calcium oxide expanded clinker powder storage bin for storage after being collected by a dust collector.
The specific surface area of the calcium oxide expanded clinker powder is measured to be 280m2Kg, when the particle size distribution of each interval is calculated by the mass percentage of the residue on the sieve, the particle size distribution of the calcium oxide expanded clinker powder is as follows: 20 percent of 0-0.03mm, 70 percent of 0.03-0.10mm, 8 percent of 0.10-0.15mm and 2 percent of more than 0.15 mm.
Example 2
A grinding process for improving the expansion efficiency of calcium oxide expansion clinker comprises the following steps:
(1) putting the calcium oxide expanded clinker into a roller press for pre-grinding treatment, controlling the rotating speed of the roller press to be 1.5m/s, and screening coarse particles with the particle size of more than or equal to 3mm by screening equipment after the calcium oxide expanded clinker is extruded by the roller press, returning the coarse particles to the roller press for re-extrusion;
(2) selecting fine particles with the particle size of less than 3mm screened in the step (1) by adopting a first-stage variable frequency powder selecting machine, wherein fine powder with the particle size of less than or equal to 0.10mm is collected by a dust collector and then is directly sent into a calcium oxide expanded cooked material powder storage bin for storage, and coarse powder with the particle size of more than 0.10mm is sent into a vertical mill;
(3) feeding the coarse powder (the calcium oxide expansion clinker with the particle size larger than 0.10mm and smaller than 3 mm) separated in the step (2) into a vertical grinding machine for deep grinding, wherein the grinding disc pressure of the vertical grinding machine is controlled at 750KN, and the grinding disc rotating speed is controlled at 18 r/min;
(4) and (3) performing powder selection regulation and control treatment on the deeply ground calcium oxide expanded clinker powder in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the particle size of more than 0.10mm to the vertical grinding machine for continuous grinding, and directly sending fine powder with the particle size of less than or equal to 0.10mm to a calcium oxide expanded clinker powder storage bin for storage after being collected by a dust collector.
The specific surface area of the calcium oxide expanded clinker powder is measured to be 260m2Kg, when the particle size distribution of each interval is calculated by the mass percentage of the residue on the sieve, the particle size distribution of the calcium oxide expanded clinker powder is as follows: 10% of 0-0.03mm, 80% of 0.03-0.10mm, 9% of 0.10-0.15mm and 1% of more than 0.15 mm.
Example 3
A grinding process for improving the expansion efficiency of calcium oxide expansion clinker comprises the following steps:
(1) putting the calcium oxide expanded clinker into a roller press for pre-grinding treatment, controlling the rotating speed of the roller press to be 1.6m/s, and screening coarse particles with the particle size of more than or equal to 3mm by screening equipment after the calcium oxide expanded clinker is extruded by the roller press, returning the coarse particles to the roller press for re-extrusion;
(2) selecting fine particles with the particle size of less than 3mm screened in the step (1) by adopting a first-stage variable frequency powder selecting machine, wherein fine powder with the particle size of less than or equal to 0.10mm is collected by a dust collector and then is directly sent into a calcium oxide expanded cooked material powder storage bin for storage, and coarse powder with the particle size of more than 0.10mm is sent into a vertical mill;
(3) feeding the coarse powder (the calcium oxide expansion clinker with the particle size of more than 0.10mm and less than 3 mm) separated in the step (2) into a vertical grinding machine for deep grinding, wherein the grinding disc pressure of the vertical grinding machine is controlled at 850KN, and the grinding disc rotating speed is controlled at 22 r/min;
(4) and (3) performing powder selection regulation and control treatment on the deeply ground calcium oxide expanded clinker powder in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the particle size of more than 0.10mm to the vertical grinding machine for continuous grinding, and directly sending fine powder with the particle size of less than or equal to 0.10mm to a calcium oxide expanded clinker powder storage bin for storage after being collected by a dust collector.
The specific surface area of the calcium oxide expanded clinker powder is 270m2Kg, when the particle size distribution of each interval is calculated by the mass percentage of the residue on the sieve, the particle size distribution of the calcium oxide expanded clinker powder is as follows: 15 percent of 0-0.03mm,78% for 0.03-0.10mm, 5% for 0.10-0.15mm, and 2% for > 0.15 mm.
Comparative example 1
The same calcium oxide expanded clinker as used in the embodiments 1 to 3, the difference is only the difference of the grinding process, and the specific steps are as follows:
(1) putting the calcium oxide expanded clinker into a roller press for pre-grinding treatment, controlling the rotating speed of the roller press to be 1.6m/s, and screening coarse particles with the particle size of more than or equal to 3mm by screening equipment after the calcium oxide expanded clinker is extruded by the roller press, returning the coarse particles to the roller press for re-extrusion;
(2) feeding the fine particles with the particle size less than 3mm screened in the step (1) into a vertical grinding machine for deep grinding, wherein the grinding disc pressure of the vertical grinding machine is controlled at 850KN, and the grinding disc rotating speed is controlled at 22 r/min;
(3) and (3) performing powder selection regulation and control treatment on the deeply ground calcium oxide expanded clinker powder in the step (2) by adopting a variable frequency powder selector, returning coarse powder with the particle size of more than 0.10mm to the vertical grinding machine for continuous grinding, and directly sending fine powder with the particle size of less than or equal to 0.10mm to a calcium oxide expanded clinker powder storage bin for storage after being collected by a dust collector.
The specific surface area of the calcium oxide expanded clinker powder is measured to be 260m2Kg, when the particle size distribution of each interval is calculated by the mass percentage of the residue on the sieve, the particle size distribution of the calcium oxide expanded clinker powder is as follows: 25% of 0-0.03mm, 60% of 0.03-0.10mm, 10% of 0.10-0.15mm and 5% of more than 0.15 mm.
Comparative example 2
The same calcium oxide expanded clinker as used in the embodiments 1 to 3, the difference is only the difference of the grinding process, and the specific steps are as follows:
(1) putting the calcium oxide expanded clinker into a roller press for pre-grinding treatment, controlling the rotating speed of the roller press to be 1.6m/s, and screening coarse particles with the particle size of more than or equal to 3mm by screening equipment after the calcium oxide expanded clinker is extruded by the roller press, returning the coarse particles to the roller press for re-extrusion;
(2) selecting fine particles with the particle size of less than 3mm screened in the step (1) by using a variable frequency powder selecting machine, wherein fine powder with the particle size of less than or equal to 0.10mm is collected by a dust collector and then is directly sent into a calcium oxide expanded cooked material powder storage bin for storage, and coarse powder with the particle size of more than 0.10mm is sent into a vertical mill;
(3) feeding the coarse powder (calcium oxide expansion clinker with the particle size of more than 0.10mm and less than 3 mm) separated in the step (2) into a vertical grinding machine for deep grinding, controlling the grinding disc pressure of the vertical grinding machine to be 850KN and the grinding disc rotating speed to be 22r/min, and preparing the calcium oxide expansion clinker with the specific surface area of 260m2When the particle size distribution of each interval is calculated by the mass percentage of the residue on the sieve, the particle size distribution of the calcium oxide expanded clinker powder is measured as follows: 32% of 0-0.03mm, 50% of 0.03-0.10mm, 12% of 0.10-0.15mm and 6% of more than 0.15 mm.
Comparative example 3
The same calcium oxide expanded clinker as used in examples 1 to 3 was used, except for the difference in the grinding process. According to the traditional grinding process of the calcium oxide expanded clinker, the calcium oxide expanded clinker is ground by adopting a ball mill until the specific surface area is 250m2The preparation method comprises the following steps of preparing comparative calcium oxide expanded clinker powder in a ratio of/kg, testing the particle size distribution of the calcium oxide expanded clinker powder, wherein each particle size interval is measured by the mass percent of the residue on sieve: 35% of 0-0.03mm, 45% of 0.03-0.10mm, 15% of 0.10-0.15mm and 5% of more than 0.15 mm.
The method that consults current national standard GB23439-2017 "concrete expanding agent" regulation tests the utility model discloses the embodiment that the preparation obtained and comparative example physical properties, table 1 gives the particle size distribution and the expansibility testing result of three kinds of grinding technology preparation of embodiment 1 ~ 3 and comparative example 1 ~ 3 calcium oxide inflation chamotte powder.
TABLE 1 examination of the properties of the expanded clinker powders obtained in examples 1 to 3 and comparative examples 1 to 3
As can be seen from the data in Table 1, compare with the grinding technology of adopting in comparative example 1 ~ 3, embodiment 1 ~ 3 adopt the utility model discloses the particle size distribution of calcium oxide inflation grog powder has effectively been improved to the grinding technology of optimizing, has avoided the excessive grinding phenomenon, is showing the restriction expansion rate that has promoted calcium oxide inflation grog powder.
Compared with the comparative example 1, the embodiment of the utility model carries out the separation and regulation treatment of powder selection before the deep grinding of the vertical mill by the first-level variable frequency powder selector to the fine particles with the particle size less than 3mm prepared by the pre-grinding of the roller press, firstly selects the fine powder of the calcium oxide expanded clinker with the particle size less than or equal to 0.10mm, then collects the fine powder by the dust collector and sends the fine powder into the storage bin for storing the calcium oxide expanded clinker powder, and then the particle size is more than 0.10mm, the coarse powder of the calcium oxide expansion clinker with the particle size less than 3mm is fed into a vertical mill for deep grinding, so that the excessive grinding of the fine powder of the calcium oxide expansion clinker with the particle size less than or equal to 0.10mm prepared in the pre-grinding process in the vertical mill is avoided, the content of the particles with the particle size of 0-0.03mm is reduced to 10% -20% from 25%, the content of the particles with the particle size of 0.03-0.10mm is increased to 70% -80% from 60%, and the 7d limited expansion rate of the calcium oxide expansion clinker powder is increased to 0.23% from 0.18%.
Compared with the comparative example 2, the embodiment of the utility model provides a through second grade frequency conversion selection machine in time separate the calcium oxide expansion grog fine powder that the particle size is less than or equal to 0.10mm that produces among the vertical mill in the deep grinding process and elect and collect through the dust collector and send into calcium oxide expansion grog powder storage storehouse storage, make the particle size control of the grinding calcium oxide expansion grog among the vertical mill between 0.10 mm-3 mm, effectively reduce the repeated excessive grinding of calcium oxide expansion grog fine powder that the particle size is less than or equal to 0.10mm in the vertical mill, make the particle content of 0-0.03mm reduce to 10% -20% from 32%, the particle content of 0.03-0.10mm increases to 70% -80% from 50%, make the 7d restriction expansion rate of calcium oxide expansion grog powder increase to 0.23 from 0.16%.
Compared with the comparative example 3, the embodiment of the utility model provides a through roller press pre-grinding and vertical mill degree of depth grinding, add the selection regulation and control of one-level frequency conversion selection powder machine and second grade frequency conversion selection powder machine and handle, optimized under the same specific surface area the particle size distribution of calcium oxide inflation chamotte powder, make 0-0.03 mm's granule content reduce to 10% ~ 20% from 35%, 0.03-0.10 mm's granule content increases to 70% ~ 80% from 45%, makes the 7d restriction expansion rate of calcium oxide inflation chamotte powder increase to 0.23% from 0.15%.
Therefore, through the utility model discloses optimized grinding technology has improved the particle size distribution of calcium oxide inflation grog powder, makes calcium oxide inflation grog powder particle size distribution form "big in the middle of, the state that both ends are little", under the prerequisite of guaranteeing calcium oxide inflation grog powder stability, has reduced the invalid inflation of calcium oxide inflation grog powder in concrete plasticity stage, has improved the effective inflation of calcium oxide inflation grog powder in concrete hardening stage, when the same restriction expansion ratio, can obviously reduce the volume of mixing of calcium oxide inflation grog, reach the low efficient purpose of mixing.
Claims (1)
1. The utility model provides a promote the grinding device of calcium oxide expansion grog expansion efficiency which characterized in that: comprises a calcium oxide expansion clinker raw material bin (1), a roller press (2), a first-stage variable frequency powder concentrator (3), a vertical mill (4), a second-stage variable frequency powder concentrator (5), a dust collector (6) and a calcium oxide expansion clinker finished product bin (7);
the lower part of the roller press (2) is provided with a screening device (22), a coarse particle discharge port (23) and a fine particle discharge port (24), the coarse particle discharge port (23) is positioned above the screening device (22), and the fine particle discharge port (24) is positioned below the screening device (22);
the primary frequency conversion powder concentrator (3) is provided with a primary frequency conversion powder concentrator feeding hole (31), a primary frequency conversion powder concentrator fine powder discharging hole (32) and a primary frequency conversion powder concentrator coarse powder discharging hole (33);
a vertical mill feeding hole (41) and a vertical mill discharging hole (42) are formed in the vertical mill (4);
the second-stage frequency conversion powder concentrator (5) is provided with a second-stage frequency conversion powder concentrator feeding hole (51), a second-stage frequency conversion powder concentrator fine powder discharging hole (52) and a second-stage frequency conversion powder concentrator coarse powder discharging hole (53);
wherein a feed opening (11) of the calcium oxide expansion clinker raw material bin, which is arranged below the calcium oxide expansion clinker raw material bin (1), is connected with a feed opening (21) of the roller press, which is arranged above the roller press (2), through a conveying device; a coarse particle discharge port (23) of the roller press is connected with a feeding port (21) of the roller press through conveying equipment, and a fine particle discharge port (24) of the roller press is connected with a feeding port (31) of a first-stage variable frequency powder concentrator through the conveying equipment; the fine powder discharge port (32) of the primary frequency conversion powder concentrator is connected with the dust collector (6) through conveying equipment, and the coarse powder discharge port (33) of the primary frequency conversion powder concentrator is connected with the feed port (41) of the vertical mill through conveying equipment; the discharge hole (42) of the vertical mill is connected with the feed hole (51) of the secondary variable frequency powder concentrator through conveying equipment, the fine powder discharge hole (52) of the secondary variable frequency powder concentrator is connected with the dust collector (6) through conveying equipment, and the coarse powder discharge hole (53) of the secondary variable frequency powder concentrator is connected with the feed hole (41) of the vertical mill through conveying equipment; and a dust collector discharge hole (61) arranged below the dust collector (6) is connected with the calcium oxide expanded clinker finished product bin (7) through conveying equipment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109999979A (en) * | 2019-04-30 | 2019-07-12 | 镇江苏博特新材料有限公司 | A kind of grinding device and technique promoting calcium oxide expansive clinker expansion performance |
| CN112473998A (en) * | 2020-12-16 | 2021-03-12 | 江苏优扬药业有限公司 | Preparation device and method of medicinal lauryl sodium sulfate fine powder |
| CN114273056A (en) * | 2021-12-30 | 2022-04-05 | 山东博研粉体技术装备有限公司 | Cement grinding system and method |
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2019
- 2019-04-30 CN CN201920616647.5U patent/CN210386128U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109999979A (en) * | 2019-04-30 | 2019-07-12 | 镇江苏博特新材料有限公司 | A kind of grinding device and technique promoting calcium oxide expansive clinker expansion performance |
| CN109999979B (en) * | 2019-04-30 | 2024-04-26 | 镇江苏博特新材料有限公司 | Grinding device and process for improving expansion efficiency of calcium oxide expansion clinker |
| CN112473998A (en) * | 2020-12-16 | 2021-03-12 | 江苏优扬药业有限公司 | Preparation device and method of medicinal lauryl sodium sulfate fine powder |
| CN114273056A (en) * | 2021-12-30 | 2022-04-05 | 山东博研粉体技术装备有限公司 | Cement grinding system and method |
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