CN112934737B - Production method of heavy calcium carbonate - Google Patents
Production method of heavy calcium carbonate Download PDFInfo
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- CN112934737B CN112934737B CN202110334622.8A CN202110334622A CN112934737B CN 112934737 B CN112934737 B CN 112934737B CN 202110334622 A CN202110334622 A CN 202110334622A CN 112934737 B CN112934737 B CN 112934737B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention provides a production method of heavy calcium carbonate, wherein in the grinding process, the specific starting sequence is as follows: firstly, turning on a classifier, increasing the speed to 100-300 revolutions, then turning on a fan, increasing the speed to 100-300 revolutions, and finally turning on a main machine, and increasing the speed to 100-300 revolutions; alternately increasing the rotating speed according to 100-300 revolutions each time until reaching a constant speed; the specific shutdown sequence is as follows: firstly, reducing the speed of a host by 100-300 revolutions, then reducing the speed of a fan by 100-300 revolutions, and finally reducing the speed of a grader by 100-300 revolutions; namely, the rotation speed is reduced alternately for every 100-300 revolutions until the stop. The method adopts the mode of step-by-step acceleration and step-by-step deceleration to alternately accelerate and decelerate the classifier and the host, can effectively avoid the generation of coarse particles, thereby achieving the effects of solving the dust problem and not generating the coarse particles, and realizing the accurate control by automatic control.
Description
Technical Field
The invention relates to the field of heavy calcium carbonate production, and particularly relates to a production method of heavy calcium carbonate.
Background
Calcium carbonate powder is the most widely used filler at present, and among them, heavy calcium carbonate produced by grinding method is most widely used because the cost of calcium carbonate powder produced by grinding method is low and the process is relatively simple. However, the grinding process produces calcium carbonate with a tendency to produce coarse particles (coarse particles generally refer to particles more than 10 times larger than normal particles), which severely limits the use of heavy calcium carbonate.
The production flow of the heavy substance is that the calcium carbonate stone blocks are crushed and then sent to a host machine for grinding, and then classified by a classifier, so that a product with the powder particle size meeting the requirement is obtained. The classifier operating at high speed is the main determining factor of the fineness of the powder, and the higher the rotating speed of the classifier is, the finer the fineness of the powder is, and conversely, the coarser the fineness of the powder is.
In the process of producing the heavy calcium carbonate, the production starting sequence is as follows: the starting method mainly aims to prevent coarse particles from being generated, the coarse particles can seriously influence the use of heavy calcium carbonate (hereinafter referred to as 'heavy calcium'), and the quality of the heavy calcium is reduced, but when the fan is not started, the positive pressure in the main machine and the system is increased along with the acceleration of the rotating speed of the classifier, a large amount of dust can be sprayed outwards, and the dust can be reduced only when the fan is started to a certain rotating speed, but a large amount of dust is generated; a large amount of dust is also generated during the shutdown. Thereby polluting the environment and seriously affecting the physical health of the field workers. The industry knows that the method has great environmental pollution, but only can destroy the environment in order to ensure the quality of the heavy calcium product, so the environmental problem of the heavy calcium production industry is always more prominent.
Therefore, the research on a production method which can solve the dust problem and does not generate coarse particles is the focus of the research of the powder workers at present.
Disclosure of Invention
The invention aims to solve the problems and provides a production method of heavy calcium carbonate, wherein a classifier, a fan and a main machine are accelerated or decelerated in turn by adopting a step-by-step acceleration mode, so that coarse particles can be effectively avoided, and the effects of solving the problem of dust and not generating the coarse particles are achieved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a production method of heavy calcium carbonate, in the grinding process,
the specific starting sequence is as follows: firstly, turning on a classifier, increasing the speed to 100-300 revolutions, then turning on a fan, increasing the speed to 100-300 revolutions, and finally turning on a main machine, and increasing the speed to 100-300 revolutions; then, the speed of the classifier is increased to 200-600 revolutions, the speed of the fan is increased to 200-600 revolutions, and the speed of the main machine is increased to 200-600 revolutions; the rotating speed is increased alternately according to 100-300 revolutions each time until the constant speed is reached;
the specific shutdown sequence is as follows: firstly, reducing the speed of a host by 100-300 revolutions, then reducing the speed of a fan by 100-300 revolutions, and finally reducing the speed of a grader by 100-300 revolutions; namely, the rotation speed is reduced alternately for every 100-300 revolutions until the stop.
Preferably, the classifier is started firstly, the speed is increased to 200 revolutions, then the fan is started to increase the speed to 200 revolutions, and finally the main machine is started to increase the speed to 200 revolutions; then the grader is accelerated to 400 revolutions, then the fan is accelerated to 400 revolutions, and finally the main machine is accelerated to 400 revolutions; the rotating speed is alternately increased according to 200 revolutions each time until the constant speed is reached;
the specific shutdown sequence is as follows: reducing the speed of a host by 200 revolutions, reducing the speed of a fan by 200 revolutions, and finally reducing the speed of a grader by 200 revolutions; i.e. 200 revolutions per revolution, until stopped.
Preferably, the specific boot sequence is: opening the classifier, increasing the speed to 200 turns → opening the fan to increase the speed to 200 turns → opening the fan intake valve → opening the main machine, increasing the speed to 200 turns → opening the material returning elevator → opening the material returning packing auger → opening the material feeding packing auger → opening the stirring packing auger → opening the feeding rotary valve → opening the medicine pump → increasing the speed of the classifier to 400 turns → 400 turns of the fan → increasing the speed of the main machine to 400 turns → increasing the speed of the classifier to 600 turns → increasing the speed of the fan to 600 turns → increasing the speed of the main machine to 600 bricks, namely, increasing the rotating speed alternately according to the 200 turns each time until the constant speed of 1500 turns is reached.
Preferably, the shutdown sequence is: closing the medicine pump → closing the feeding rotary valve → closing the stirring auger → closing the feeding auger → closing the returning elevator → slowing down the speed of the main engine to 1300 turn → slowing down the speed of the fan to 1300 turn → slowing down the speed of the grader to 1300 turn → slowing down the speed of the main engine to 1100 turn → turning the fan to 1100 turn → slowing down the speed of the grader to 1100 turn, namely, the speed is reduced alternately according to 200 turns each time until stopping.
As a further improvement, the classifier adopts a back-blowing labyrinth seal.
Preferably, the classifier adopts a labyrinth seal structure, a gas flow channel is arranged on a seal plate of the labyrinth seal, the gas flow channel is communicated with a compressed air pipe, and the compressed air pipe blows air into the labyrinth seal through the gas flow channel so as to form a certain air pressure in the labyrinth seal.
Preferably, when the 600-1500 mesh heavy calcium carbonate is prepared, the airflow pressure is 0.1-0.15 Mpa; when the 1500-2500 mesh heavy calcium carbonate is produced, the airflow pressure is 0.15-0.2 Mpa; when the ground calcium carbonate with more than 2500 meshes is produced, the airflow pressure is 0.2-0.3 Mpa.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the production method of the heavy calcium carbonate, the sequence of firstly opening the main machine, then opening the fan and finally opening the classifier is adopted, so that the phenomenon that dust is sprayed out due to the fact that the classifier is firstly opened can be avoided, coarse particles are increased due to the fact that the sequence is simply changed, therefore, the generation of the coarse particles can be effectively avoided by means of alternately increasing the speed of the classifier, the fan and the main machine in a step-by-step speed increasing mode, and the effects that the dust problem can be solved and the coarse particles are not generated are achieved.
2. The heavy calcium carbonate producing process has back blowing labyrinth seal for the classifier to reduce coarse particle generation, and the classifier has plane labyrinth in the matching surface between the classifying wheel and the machine body, holes distributed homogeneously, and compressed air pipe connected to the holes to inject extra air flow into the labyrinth to form certain pressure similar to the air seal effect and to block coarse particle passage basically.
In order to reduce the interference to the negative pressure of the system and exert the air seal function to the maximum extent, the drilled hole is required to incline to a certain angle in the host, and the test angle is 10-15 degrees, so that the best effect is achieved.
And then the pressure of the air flow is adjusted, the balance of the system can be seriously disturbed because the pressure of the air flow is too high, so that the quality of the product generates larger fluctuation, and the pressure of the air flow is too low, so that the effect of blocking coarse particles cannot be realized. Generally, the finer the fineness is, the higher the requirement on coarse particles is, so that the proper air seal pressure is adjusted according to the fineness, the content of the coarse particles can meet the requirement of customers, the balance of a system is not influenced to the maximum extent, and the airflow pressure is 0.1-0.15 MPa when the 600-1500-mesh heavy calcium carbonate is prepared; when the 1500-2500 mesh heavy calcium carbonate is produced, the airflow pressure is 0.15-0.2 Mpa; when the ground calcium carbonate with more than 2500 meshes is produced, the airflow pressure is 0.2-0.3 Mpa.
Drawings
FIG. 1 is a schematic view of a classifier according to embodiment 6 of the present invention;
FIG. 2 is an enlarged schematic view of a part B of a classifier according to embodiment 6 of the present invention;
fig. 3 is a sectional view of a classifier a-a according to embodiment 6 of the present invention.
Wherein, 1-organism 1; 2-a grading wheel; 3, a motor; 4-sealing a plate; 5-an annular groove; 501-air holes; 6, an air inlet pipe; 7-air intake 7; 8-fine material outlet; 9-coarse material outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A production method of ground calcium carbonate, in the grinding process,
the specific starting sequence is as follows: firstly, turning on a classifier, increasing the speed to 200 revolutions, then turning on a fan, increasing the speed to 200 revolutions, and finally turning on a main machine, and increasing the speed to 200 revolutions; then the grader increases the speed to 400 revolutions, the fan increases the speed to 400 revolutions, and the host increases the speed to 400 revolutions; namely, the rotation speed is increased alternately according to 200 revolutions each time until the constant speed is reached.
The specific shutdown sequence is as follows: firstly, reducing the speed of a host by 200 revolutions, then reducing the speed of a fan by 200 revolutions, and finally reducing the speed of a grader by 200 revolutions; i.e. 200 revolutions per revolution, until stopped.
Example 2
A production method of heavy calcium carbonate sets the constant speed revolution number to be 1500 revolutions.
In the grinding process, the specific starting sequence is as follows: opening the classifier, increasing the speed to 100 turns → opening the fan intake valve → opening the main machine, increasing the speed to 100 turns → opening the material returning elevator → opening the material returning packing auger → opening the material feeding packing auger → opening the stirring packing auger → opening the feeding rotary valve → opening the medicine pump → increasing the speed of the classifier to 200 turns → increasing the speed of the fan to 200 turns → increasing the speed of the main machine to 200 turns → increasing the speed of the classifier to 300 turns → increasing the speed of the fan to 300 turns → increasing the speed of the main machine to 300 bricks, namely, increasing the rotating speed alternately according to 100 turns each time until the constant speed of 1500 turns is reached.
The shutdown sequence is as follows: closing the medicine pump → closing the feeding rotary valve → closing the stirring auger → closing the feeding auger → closing the returning elevator → slowing down the speed of the main engine to 1400 turns → slowing down the speed of the fan to 1400 turns → slowing down the speed of the classifier to 1400 turns → slowing down the speed of the main engine to 1300 turns → 1300 turns of the fan → slowing down the speed of the classifier to 1300 turns, namely, the rotating speed is reduced alternately according to each 100 turns until stopping.
Example 3
A production method of heavy calcium carbonate sets the constant speed revolution number to be 1500 revolutions.
In the grinding process, the specific starting sequence is as follows: opening the classifier, increasing the speed to 200 turns → opening the fan intake valve → opening the main machine, increasing the speed to 200 turns → opening the material returning elevator → opening the material returning packing auger → opening the material feeding packing auger → opening the stirring packing auger → opening the feeding rotary valve → opening the medicine pump → increasing the speed of the classifier to 400 turns → increasing the speed of the fan to 200 turns → increasing the speed of the main machine to 400 turns → increasing the speed of the classifier to 600 turns → increasing the speed of the fan to 600 turns → increasing the speed of the main machine to 600 bricks, namely, increasing the rotating speed alternately according to 200 turns each time until the constant speed of 1500 turns is reached.
The shutdown sequence is as follows: closing the medicine pump → closing the feeding rotary valve → closing the stirring auger → closing the feeding auger → closing the returning elevator → slowing down the speed of the main engine to 1300 turn → slowing down the speed of the fan to 1300 turn → slowing down the speed of the grader to 1300 turn → slowing down the speed of the main engine to 1100 turn → turning the fan to 1100 turn → slowing down the speed of the grader to 1100 turn, namely, the speed is reduced alternately according to 200 turns each time until stopping.
Example 4
A production method of heavy calcium carbonate sets the constant speed revolution number to be 1500 revolutions.
In the grinding process, the specific starting sequence is as follows: opening the classifier, increasing the speed to 300 turns → opening the fan, increasing the speed to 300 turns → opening the air inlet valve of the fan → opening the main machine, increasing the speed to 300 turns → opening the material returning elevator → opening the material returning packing auger → opening the material feeding packing auger → opening the stirring packing auger → opening the feeding rotary valve → opening the medicine pump → increasing the speed of the classifier to 600 turns → increasing the speed of the fan to 600 turns → increasing the speed of the main machine to 600 turns → increasing the speed of the classifier to 900 turns → increasing the speed of the fan to 900 turns → increasing the speed of the main machine to 900 bricks, namely, increasing the rotating speed alternately according to 300 turns each time until the constant speed of 1500 turns is reached.
The shutdown sequence is as follows: closing the medicine pump → closing the feeding rotary valve → closing the stirring auger → closing the feeding auger → closing the returning elevator → reducing the speed of the main machine to 1200 turns → reducing the speed of the fan to 1200 turns → reducing the speed of the grader to 1200 turns → reducing the speed of the main machine to 900 turns → 900 turns the fan to 900 turns → reducing the speed of the grader to 900 turns, namely, reducing the speed alternately by 300 turns each time until stopping.
Example 5
A production method of heavy calcium carbonate sets the constant speed revolution number to be 1500 revolutions.
In the grinding process, the specific starting sequence is as follows: opening the classifier, increasing the speed to 200 turns → opening the fan to increase the speed to 200 turns → opening the fan intake valve → opening the main machine, increasing the speed to 200 turns → opening the material returning elevator → opening the material returning packing auger → opening the material feeding packing auger → opening the stirring packing auger → opening the feeding rotary valve → opening the medicine pump → increasing the speed of the classifier to 400 turns → increasing the speed of the fan to 400 turns → increasing the speed of the main machine to 400 turns → increasing the speed of the classifier to 600 turns → increasing the speed of the fan to 600 turns → increasing the speed of the main machine to 600 bricks, namely, increasing the rotating speed alternately according to 200 turns each time until the constant speed of 1500 turns is reached.
The shutdown sequence is as follows: closing the medicine pump → closing the feeding rotary valve → closing the stirring auger → closing the feeding auger → closing the returning elevator → reducing the speed of the main machine to 1300 turn → reducing the speed of the fan to 1300 turn → reducing the speed of the grader to 1300 turn → reducing the speed of the main machine to 1100 turn → 1100 turn of the fan → reducing the speed of the grader to 1100 turn, namely, reducing the speed of the grader alternately according to 200 turns each time until stopping.
The grader adopts a back-blowing labyrinth seal.
The classifier adopts labyrinth seal structure, set up the gas flow way on labyrinth seal's the closing plate, the gas flow way communicates with compressed air pipe, compressed air pipe passes through the gas flow way to the interior gas flow of labyrinth seal makes the labyrinth seal form certain atmospheric pressure.
Example 6
A production method of heavy calcium carbonate sets the constant speed revolution number to be 1500 revolutions.
In the grinding process, the specific starting sequence is as follows: opening the classifier, increasing the speed to 200 turns → opening the fan to increase the speed to 200 turns → opening the fan intake valve → opening the main machine, increasing the speed to 200 turns → opening the material returning elevator → opening the material returning packing auger → opening the material feeding packing auger → opening the stirring packing auger → opening the feeding rotary valve → opening the medicine pump → increasing the speed of the classifier to 400 turns → increasing the speed of the fan to 400 turns → increasing the speed of the main machine to 400 turns → increasing the speed of the classifier to 600 turns → increasing the speed of the fan to 600 turns → increasing the speed of the main machine to 600 bricks, namely, increasing the rotating speed alternately according to 200 turns each time until the constant speed of 1500 turns is reached.
The shutdown sequence is as follows: closing the medicine pump → closing the feeding rotary valve → closing the stirring auger → closing the feeding auger → closing the returning elevator → slowing down the speed of the main engine to 1300 turn → slowing down the speed of the fan to 1300 turn → slowing down the speed of the grader to 1300 turn → slowing down the speed of the main engine to 1100 turn → turning the fan to 1100 turn → slowing down the speed of the grader to 1100 turn, namely, the speed is reduced alternately according to 200 turns each time until stopping.
The grader adopts a back-blowing labyrinth seal.
As shown in fig. 1, the classifier includes a machine body 1 and a classifying wheel 2, the sealing plate 4 is fixed on the machine body 1 and forms a labyrinth seal with a support of the classifying wheel 2, an air inlet 7 and an air hole 501 are arranged on the sealing plate 4, an annular groove 5 is arranged on the top of the sealing plate, the air inlet 7 is communicated with the annular groove 5, the air hole 501 is uniformly distributed on the annular groove 5, and the diameter of the air hole is 8 mm. The air inlet hole 7 is communicated with an air inlet pipe 6, and the air inlet pipe 6 is communicated with a pressure gas source.
When the crusher is used, the motor 3 is turned on, the classifier is started, the classifying wheel 2 rotates, strong centrifugal force is formed in the classifier, a mixture of gas and powder materials entering the classifier firstly enters the classifying wheel, large or heavy particles are subjected to large centrifugal force under the action of the centrifugal force, and naturally fall into the crushing main machine to be continuously crushed or fall into the coarse material outlet 9 for collection; the small or light materials are little influenced by the centrifugal force, are brought to the high position under the influence of the induced draft fan and are discharged from a fine material outlet 8 at the upper part of the centrifugal classifier. In whole process, the high-pressure gas that produces through the pressure gas source passes through intake pipe 6 and gets into ring channel 5, and the pore 501 that sets up on the rethread ring channel 5 gets into labyrinth seal, leads to all the time in the labyrinth seal clearance and has high-pressure gas, and high-pressure gas plays the blowback effect to sealing clearance, and the effectual powder material that prevents gets into sealing clearance gets into fine material export 8, influences hierarchical precision and grading effect.
Example 7
A method for producing ground calcium carbonate, when preparing 1000 mesh ground calcium carbonate, the airflow pressure is 0.15Mpa, other steps are the same as those in example 6.
Example 8
A method for producing ground calcium carbonate, when 2000 mesh ground calcium carbonate is produced, the airflow pressure is 0.2Mpa, other steps are the same as those adopted in example 6.
Example 9
A production method of heavy calcium carbonate, when producing heavy calcium carbonate with more than 3000 meshes, the airflow pressure is 0.25Mpa, and other steps are the same as those in example 6.
Experimental verification
1.1 verify the effect of different speed-up/down revolutions on coarse particle and dust escape.
1.1.1 referring to the production method of the embodiment 6, the difference is that the starting mode is different, the product is collected for detection 20min after starting, the traditional mode is shut down, and after each shutdown, the next test is carried out after clearance powder is emptied.
TABLE 1 different starting modes test results
The traditional method is that the grader is started firstly to reach full speed, then the fan is started to reach full speed, and finally the main machine is started to reach full speed.
As can be seen from the data in table 1, the traditional starting method (starting the classifier first, and starting the fan and the host in sequence after reaching the full speed) results in the most serious coarse particles of the product, while the alternative starting of 200 revolutions has less coarse particles, which meets the use requirements of most downstream customers, and the starting is performed at every 200 revolutions by comprehensively considering the effect and the cost.
1.1.2 referring to the production method of example 6, except for the different shutdown modes, after shutdown, the heavy calcium carbonate powder was emptied out for testing and then the next set of experiments was performed.
TABLE 2 different shut-down mode test results
The traditional method is that the host is completely stopped firstly, then the fan is completely stopped, and finally the classifier is completely stopped.
As can be seen from the data in Table 2, the conventional shutdown resulted in the most severe coarse particles in the product, while the alternating 200-rpm deceleration resulted in less coarse particles, which met the usage requirements of most downstream customers.
In summary, the number of coarse particles can be reduced to a large extent by alternately starting and shutting down, and the experiments are emptied after each experiment, so that other influences are eliminated. In actual production, the production is continuous for a long time, so that the mode of alternately increasing or reducing speed is adopted for starting and stopping the machine, and the requirement can be met. And the starting and the shutdown are accelerated by every 200 revolutions by comprehensively considering the effect and the cost.
1.2 influence of the reverse-blowing labyrinth seal on coarse particles.
The production was carried out by the methods of examples 3 and 6, and the coarse particles of ground calcium carbonate were calculated and compared with the number of coarse particles in 100g of the product.
The coarse particles in the heavy calcium carbonate powder produced in the example 6 are less than 5 particles/100 g, while the coarse particles in the heavy calcium carbonate powder produced in the example 3 reach 30-50 particles/100 g without adopting the back-blowing labyrinth seal, so the back-blowing labyrinth seal has a remarkable effect on reducing the coarse particles.
1.3 quantitatively verifying that different speed-up/speed-down revolutions influence respiratory dust concentration
The experimental method comprises the following steps: part 2 according to workplace airborne dust determination: concentration of respiratory dust (GBZ/T)
192.1-2007, detection of respiratory dust (individual) data.
An FCG-5 explosion-proof individual dust sampler is adopted;
experimental groups were as follows: the methods of examples 2-4 and 6 were used to prepare ground calcium carbonate to verify the effect of different speed-increasing revolutions.
The experimental results are as follows: see table 3.
TABLE 3 respiratory dust (Individual) monitoring results
On the basis of qualitatively analyzing the dust escape in tables 1 and 2, the dust escape condition is further quantitatively tested, as can be seen from table 3 above, when the replacement acceleration rate is carried out every 300 times, the dust concentration of the monitoring result is also larger, although the dust concentration is still in the range of the contact limit value, the test values of the forklift driver station and the packaging station are already close to the limit value, the dust concentration of the station is lower by the alternate acceleration rate of every 200 revolutions and every 100 revolutions, the replacement acceleration rate effect of 100 revolutions is not greatly improved by the speed increase rate of 200 revolutions, and the starting time is increased by the alternate acceleration rate of every 100 revolutions, so that the replacement acceleration starting is carried out every 200 revolutions by comprehensively considering the effect and the cost. The back-blowing labyrinth seal has obvious effect on reducing coarse particles and has little influence on the escape of dust.
1.4 verification of results of different back-blowing air pressure tests on 600-mesh products
The method of example 6 is adopted to prepare 600 mesh heavy calcium carbonate, and different back-blowing air pressures are adopted to perform coarse particle detection on the product, and the results are shown in the following table 4.
Table 4 respiratory dust (individual) monitoring results
| Back-blowing air pressure | Coarse particles in 100g of product |
| Without back-blowing air pressure | 20 to 30 |
| 0.05MPa | 10 to 15 granules |
| 0.1 |
5 granules |
| 0.15MPa | 3-5 granules |
| 0.2 |
3 granules |
| 0.3 |
3 granules |
It can be seen from the data in table 4 that when the back-blowing pressure is not present, the coarse particles are very obvious, when the back-blowing pressure reaches 0.1MPa, the coarse particles are only 5, which meets the use requirements of most downstream customers, and the effect of the back-blowing pressure above 0.2MPa is not obviously improved, but affects the balance of the system, so that the back-blowing pressure is selected to be 0.1-0.15.
The above description is directed to the details of the preferred and possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention. All changes and modifications that come within the spirit of the invention are desired to be protected.
Claims (7)
1. A production method of heavy calcium carbonate is characterized in that in the grinding process,
the specific starting sequence is as follows: firstly, turning on a classifier, increasing the speed to 100-300 revolutions, then turning on a fan, increasing the speed to 100-300 revolutions, and finally turning on a main machine, and increasing the speed to 100-300 revolutions; then, the speed of the classifier is increased to 200-600 revolutions, the speed of the fan is increased to 200-600 revolutions, and the speed of the main machine is increased to 200-600 revolutions; the rotating speed is increased alternately according to 100-300 revolutions each time until the constant speed is reached;
the specific shutdown sequence is as follows: firstly, reducing the speed of a host by 100-300 revolutions, then reducing the speed of a fan by 100-300 revolutions, and finally reducing the speed of a grader by 100-300 revolutions; namely, the rotation speed is reduced alternately for every 100-300 revolutions until the stop.
2. The method for producing heavy calcium carbonate according to claim 1, wherein the specific start-up sequence is as follows: firstly, turning on a classifier, increasing the speed to 200 revolutions, then turning on a fan, increasing the speed to 200 revolutions, and finally turning on a main machine, increasing the speed to 200 revolutions; then the grader is accelerated to 400 revolutions, then the fan is accelerated to 400 revolutions, and finally the main machine is accelerated to 400 revolutions; the rotating speed is alternately increased according to 200 revolutions each time until the constant speed is reached;
the specific shutdown sequence is as follows: firstly, reducing the speed of a host by 200 revolutions, then reducing the speed of a fan by 200 revolutions, and finally reducing the speed of a grader by 200 revolutions; i.e. 200 revolutions per revolution, until stopped.
3. The method for producing heavy calcium carbonate according to claim 1, wherein the specific start-up sequence is as follows: opening the classifier, increasing the speed to 200 turns → opening the fan to increase the speed to 200 turns → opening the fan intake valve → opening the main machine, increasing the speed to 200 turns → opening the material returning elevator → opening the material returning packing auger → opening the material feeding packing auger → opening the stirring packing auger → opening the feeding rotary valve → opening the medicine pump → increasing the speed of the classifier to 400 turns → 400 turns of the fan → increasing the speed of the main machine to 400 turns → increasing the speed of the classifier to 600 turns → increasing the speed of the fan to 600 turns → increasing the speed of the main machine to 600 bricks, namely, increasing the rotating speed alternately according to the 200 turns each time until the constant speed of 1500 turns is reached.
4. The process for the production of ground calcium carbonate according to claim 1, characterized in that the shutdown sequence is: closing the medicine pump → closing the feeding rotary valve → closing the stirring auger → closing the feeding auger → closing the returning elevator → slowing down the speed of the main engine to 1300 turn → slowing down the speed of the fan to 1300 turn → slowing down the speed of the grader to 1300 turn → slowing down the speed of the main engine to 1100 turn → turning the fan to 1100 turn → slowing down the speed of the grader to 1100 turn, namely, the speed is reduced alternately according to 200 turns each time until stopping.
5. The method for producing heavy calcium carbonate according to claim 1, wherein the classifier uses a reverse-blowing labyrinth seal.
6. The method for producing heavy calcium carbonate according to claim 5, wherein the classifier uses a labyrinth seal structure, a sealing plate of the labyrinth seal is provided with a gas flow passage, the gas flow passage is communicated with a compressed air pipe, and the compressed air pipe blows air into the labyrinth seal through the gas flow passage, so that a certain air pressure is formed in the labyrinth seal.
7. The method for producing heavy calcium carbonate according to claim 5, wherein the airflow pressure is 0.1-0.15 MPa when the 600-1500 mesh heavy calcium carbonate is prepared; when the 1500-2500 mesh heavy calcium carbonate is produced, the airflow pressure is 0.15-0.2 Mpa; when the ground calcium carbonate with more than 2500 meshes is produced, the airflow pressure is 0.2-0.3 Mpa.
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