Equipment composition of jet mill production line
The air source is the driving force for the grinding process of the jet mill. The requirements for compressed air can be between 0.7-0.8MPa, and the pressure can be kept stable, otherwise the quality of the product will be affected. Secondly, the gas quality is required to be clean and dry, and compressed air should be purified to remove water, oil mist, and dust in the gas, so that the material is not polluted, and it is suitable for the grinding of materials with high purity requirements.
The raw material supply is to lift the raw materials into the raw material silo with a hoist, and then send the raw materials into the grinding chamber of the jet mill through the feed valve. This machine has strong adaptability to the particle size of the materials, and generally requires 325 mesh raw materials. The speed of the raw material conveyor is automatically controlled to keep the mixing concentration of raw materials and air in the grinding chamber relatively stable. Two pairs of nozzles are installed symmetrically in the grinding chamber. When the compressed air passes through the nozzles, a supersonic airflow is formed, which accelerates and collides with the animal materials to pulverize the materials into ultra-fine powder. The grinding effect is related to the shape of the inner diameter of the nozzle, distance, symmetry and the mixing concentration of the material and air. The shape of the inner diameter of the nozzle determines the speed and distance at which the speed of sound is formed, and determines the acceleration distance of the material. Speed, raw material and air mixing concentration also affect product size and output.
The classification is carried out by a high-speed rotating classification wheel. The grading wheel is like a round "iron bucket", the center of the bottom is fixed on the main shaft directly connected to the motor, and it is driven by the motor to rotate at high speed. The opening is opposite to the pipe entrance of the micro powder collection system, and a certain gap is maintained. The gap cannot be too large, otherwise the unsorted coarse powder enters the pipe of the micro powder collection system from the gap and affects the product quality. In order to prevent such incidents from happening, air seal treatment is carried out at the gap. The gap between the blades of the classifying wheel is a channel for sorting fine powder. The ground fine powder floats with the airflow. Because of its small particle size, the ultrafine powder can enter the dust collector through the gap between the blades. Under the centrifugal force of the classifying wheel, the larger particles splash to the outer wall and then fall to be ground again. Adjust the rotation speed of the classification wheel to obtain products with different particle sizes.
For the control of the mixing concentration of materials and air in the grinding chamber, capacitive material density control switches or sensors can be used. This machine uses the current of the drive motor to control. This control method is simple, feasible and easy to control. When the mixing concentration of materials and air increases, the density of dust floating with the airflow increases, and the dust hitting the classifying wheel increases, which increases the current of the drive motor; on the contrary, the current of the drive motor decreases. Using the size of the motor current to control the amount of conveyed materials can keep the mixing concentration of materials and air stable. When the driving current increases, the conveying will be stopped immediately, so that the powder and the conveying can maintain a dynamic balance to ensure the stability of product quality.
The powder collection system consists of a cyclone separator and dust collection. The ultra-fine powder enters the cyclone separator through the sealed pipe, the airflow rotates in the cyclone separator, and the ultra-fine powder is thrown out and landed, discharged by the discharge system and packaged to be the finished product. The cyclone separator can be used in one or two stages. Some dust from the air flow from the cyclone separator enters the dust collector, and is filtered through a cloth bag. The exhaust gas is drawn out under the action of the induced draft fan, and the dust content is very small. In order to prevent these dusts from being discharged into the atmosphere and polluting the environment, we also add a set of dust filters to recover the dust, and the exhaust gas is finally discharged into the atmosphere. The entire production process is automatically controlled by the control cabinet. The control cabinet supplies the entire production power (not including the gas supply power). It can also control parameter adjustment, automatic start and stop, automatic protection, fault alarm and automatic shutdown to ensure the safe operation of equipment and Stable product quality.
Advantages of jet mill
A good grinding effect is the advantage of the jet mill, but the problems of high cost, high energy consumption, and easy abrasion of the equipment have always been the weaknesses of the jet mill. In recent years, with the continuous improvement of the technical level of the industry, the quality and performance of the products have been significantly improved, and the jet mill has a good market application prospect.
At present, the main objective of the development of the grinding industry in the world is to increase the fineness while increasing the output and expand the scope of application, such as the grinding of materials with high fibrous, high hardness, high toughness, viscous and elasticity, low-temperature grinder, inert gas protection Grinding machines are also the focus of many manufacturers' research and development.
Grinding is a very important part of the pharmaceutical production process, and the grinding equipment should not be underestimated. Among them, jet mills are used in almost all fine processing industries, such as medicine, food, chemical industry, etc., and occupy a special position in many specific powder fields.
The jet mill grinds the material through the impact between the material particles under the action of high-speed airflow, and the impact, friction, and shearing of the airflow on the material and the impact, friction, and shear between the material and other parts. It has the following main characteristics:
1. The grinding temperature is low, and it can grind materials with heat sensitivity and low melting point. When the gas is sprayed from the nozzle and expands adiabatically, the gas will cool itself, thereby offsetting the heat generated by the collision and friction of the material.
2. Short production cycle and high powder collection rate. Due to high-speed collision and closed grinding, the probability of collision between materials is high, and there is no leakage of dust.
3. Products with high purity (less pollution) and uniform particle size distribution can be obtained.
4. For some materials that have to be wet-milled, it can also be dry-milled by jet milling to obtain uniform and fine powder.
5. A variety of combined operations can be realized, and the drying operation can be realized at the same time as grinding.
It can be seen from the above that the jet mill plays an important role in the grinding process of the pharmaceutical industry, and with the continuous development of the pharmaceutical industry, the status of the jet mill will continue to rise.
The extensive processing methods in the past can no longer meet the requirements of traditional Chinese medicine production. Traditional grinders have certain limitations in many aspects such as powder particle size, powder extraction rate, powder collection rate, and preservation of effective ingredients. Air jet milling technology will provide a new way to develop ultra-fine Chinese medicine powder with better curative effect and better varieties.
In the future development road, if the airflow grinding technology is introduced into the processing link of Chinese medicine, a brand-new grinding technology can be created, which not only enriches the content of traditional processing, but also brings a new look to the processing and production of Chinese medicine. It will become the growth point of new technologies in the traditional Chinese medicine industry.
As an important grinding equipment, the jet mill requires continuous technological innovation to improve product performance, improve product structure, and increase the grinding particle size and purity. The research and development of ultra-fine jet mills will be a good choice.
What are the main applications of graphite?
- Traditional applications
1) Refractory materials: Graphite and its products have the properties of high temperature resistance and high strength. It is mainly used in the metallurgical industry to make graphite crucibles. In steelmaking, graphite is often used as a protective agent for steel ingots and as a lining for metallurgical furnaces.
2) Conductive materials: used in the electrical industry to make electrodes, brushes, carbon rods, carbon tubes, positive electrodes of mercury positive current devices, graphite washers, telephone parts, coatings for television picture tubes, etc.
3) Wear-resistant lubricating material: Graphite is often used as a lubricant in the machinery industry. Lubricating oil can not be used under high-speed, high-temperature, and high-pressure conditions, while graphite wear-resistant materials can work at high sliding speeds at a temperature of 200 to 2000 ℃ without lubricating oil. Many equipment for transporting corrosive media widely use graphite materials to make piston cups, sealing rings and bearings, and they do not need to add lubricating oil during operation. Graphite emulsion is also a good lubricant for many metal processing (wire drawing, pipe drawing).
4) Graphite has good chemical stability. Specially processed graphite has the characteristics of corrosion resistance, good thermal conductivity, and low permeability. It is widely used in the production of heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters, Pump equipment. It is widely used in petrochemical industry, hydrometallurgy, acid-base production, synthetic fiber, papermaking and other industrial sectors, which can save a lot of metal materials.
5) Casting, sand foundry, die and high-temperature metallurgical materials: due to the small thermal expansion coefficient of graphite and the ability to withstand rapid changes in cold and heat, it can be used as a glass mold. After graphite is used, ferrous metals can be used to obtain castings with precise dimensions and a high surface smooth and finished product rate. , Can be used without processing or a little processing, thus saving a lot of metal. The production of cemented carbide and other powder metallurgy processes usually use graphite materials to make porcelain boats for compression molds and sintering. Single crystal silicon crystal growth crucibles, regional refining vessels, support fixtures, induction heaters, etc. are all made of high-purity graphite. In addition, graphite can also be used for vacuum smelting graphite heat insulation boards and bases, high-temperature resistance furnace tubes, rods, plates, grid sheds and other components.
6) Used in the atomic energy industry and national defense industry: Graphite has a good neutron moderator used in atomic reactors. Uranium-graphite reactor is a kind of atomic reactor that is widely used. The deceleration material in the nuclear reactor used as power should have high melting point, stability, and corrosion resistance. Graphite can fully meet the above requirements. As the graphite used in atomic reactors, the purity requirements are very high, and the impurity content should not exceed dozens of PPM, especially the boron content should be less than 0.5 PPM. In the defense industry, graphite is also used to make solid fuel rocket nozzles, missile nose cones, parts of aerospace equipment, heat insulation materials and radiation protection materials.
7) Graphite can also prevent boiler fouling. Tests by related units have shown that adding a certain amount of graphite powder (approximately 4 to 5 grams per ton of water) can prevent boiler surface fouling. In addition, graphite coating on metal chimneys, roofs, bridges, and pipes can prevent corrosion and rust.
8) Graphite can be used as pencil lead, pigment and polishing agent. After graphite is specially processed, various special materials can be made for use in relevant industrial sectors.
- New applications
1) Flexible graphite products. The flexible graphite sealing material solves the leakage problem of the atomic energy valve. In addition to the characteristics of natural graphite, this product also has special flexibility and elasticity, making it an ideal sealing material. It is widely used in petrochemical, atomic energy and other industrial fields.
2) Graphite is also a polishing agent and anti-rust agent for glass and papermaking in light industry, and is an indispensable raw material for the manufacture of pencils, ink, black paint, ink, synthetic diamonds, and diamonds.
With the development of modern science and technology and industry, the application field of graphite is still expanding. It has become an important raw material for new composite materials in the high-tech field and plays an important role in the national economy.
Common problems & treatment measures of ball mill
In the course of using the ball mill, various problems will inevitably occur, and there are different treatment measures for different problems.
1. When the ball mill is running, there is a regular beating sound, and the sound is loud. This is because part of the liner bolts are not tightened. When the ball mill rotates, the liner hits the barrel of the ball mill. Judge the position of the liner of the ball mill according to the sound, find out the loose bolts, and tighten them separately.
2. The temperature of the bearings of the ball mill and the motor has risen, exceeding the regulations. Try to check whether the temperature of the bearing part or all of it is too high by hand. Check and deal with the ball mill from the following points.
(1) Check the lubrication points of each part of the ball mill, and whether the type of lubricating oil used is consistent with the factory manual of the equipment.
(2) Check whether the lubricating oil and grease of the ball mill have deteriorated.
(3) Check whether the lubrication pipeline of the ball mill is blocked, or the lubricating oil does not directly enter the lubrication point, and the insufficient amount of oil causes heat.
(4) The side clearance of the bearing bush of the ball mill is too small, the clearance between the bearing bush and the shaft is too large, and there are too many contact points, which can not form a uniform oil film on the bearing bush.
(5) There is too much or too little grease in the rolling bearing of the ball mill. Too much forms the rolling elements and agitates the grease to generate heat, and the heat is not easy to dissipate. If the lubrication is too little, the oil should be added enough according to the regulations, generally 1/3~1/2 of the bearing gap is more appropriate.
(6) The sealing device of the hollow shaft at both ends of the ball mill body is too tight, or the iron part of the sealing body is in direct contact with the shaft.
The above-mentioned problems shall be dealt with according to their reasons. If the side clearance of the bearing bush is too small, or the contact angle at the bottom is too large, the grinding cylinder must be jacked up with an oil hydraulic jack, the bearing bush must be pulled out from one side of the shaft, and the tile opening must be scratched separately.
3. Heating of ball mill reducer bearing:
In addition to checking the bearing temperature rise of the ball mill, check whether the vent hole of the reducer is blocked, and unblock the vent hole.
4. After the ball mill motor with reducer is started, the vibration occurs, the main reasons are:
(1) The gap between the two wheels of the ball mill coupling is too small to compensate for the amount of movement caused by the self-finding magnetic center when the motor is started.
(2) The method of aligning the coupling of the ball mill is incorrect, causing the two shafts to be misaligned.
(3) The connecting bolts of the ball mill coupling are not tightened symmetrically, and the degree of tightening force is different.
(4) The outer ring of the ball mill bearing moves.
Treatment method: Adjust the gap according to the regulation to make the two shafts concentric. Tighten the coupling bolts of the coupling symmetrically with the same torque. When the rotor is unbalanced, take out the rotor of the ball mill to find a static balance.
5. When the ball mill reducer drives the mill, huge vibration occurs:
(1) The balance shaft of the ball mill and the reducer, the shaft center is not in a straight line, the reason is:
When the mill was installed with the liner, the secondary grouting was not carried out, or the anchor bolts after the secondary grouting were not fastened properly, the mill cylinder was rotated by the hoist, which caused one end of the mill cylinder to shift, and the two shaft centers were not in line. Vibration occurs after the reducer drives the mill.
Treatment method: re-adjust so that the axis of the ball mill mill and the axis of the reducer are on the same plane axis.
(2) The large-scale ball mill is large in size and heavy, which causes the foundation to sink; displacement occurs. Set up monitoring settlement points next to the foundation; make observations and make adjustments if there is sinking.
6. The running sound of the reducer of the ball mill is abnormal:
The sound of the normal operation of the ball mill reducer should be uniform and stable. If the gear has a slight knocking sound, a hoarse friction sound, and there is no obvious change during operation, you can continue to observe, find out the cause, and stop the ball mill for treatment. If the sound is getting louder, stop the ball mill for inspection immediately.
Maintenance of ultra-fine grinder
The maintenance of the ultra-fine grinding machine is an extremely important and frequent work, and it is closely coordinated with the operation and maintenance, and it should be checked by a full-time staff.
The ultra-fine grinder is an equipment that uses air separation, heavy pressure grinding, and shearing to achieve ultra-fine grinding of dry materials. Let's take a look at the maintenance of the ultra-fine grinder:
1. The shaft bears the full load of the negative machine, so good lubrication has a great relationship with the life of the bearing, it directly affects the life and operation rate of the machine, so the injected lubricating oil must be clean and well sealed. The main oil injection points of the machine include: rotating bearings, roll bearings, all gears, movable bearings, and sliding planes.
2. The newly installed wheel tyres are prone to looseness and must be checked frequently.
3. Pay attention to whether all parts of the machine work normally.
4. Pay attention to check the degree of wear of easily worn parts, and pay attention to replacing worn parts at any time.
5. The plane of the bottom frame of the movable device should be cleaned of dust, so as to prevent the movable bearing from moving on the bottom frame when the machine encounters unbreakable materials, which may cause serious accidents.
6. If the bearing oil temperature rises, stop the machine immediately to check the cause and eliminate it.
7. When the rotating gear is running, if there is an impact sound, stop and check it immediately and eliminate it.
Ultra-fine grinding technology is a technology that has been developed and widely used in recent decades. At the same time, the ultra-fine grinder industry has also been rapidly developed, especially in the pharmaceutical industry, and has been more widely used. The future development prospects are promising. It has been successfully applied to many industries such as chemical industry, medicine, machinery and so on. Especially the ultra-fine grinding products produced by the vibration method have the advantages of fine grinding particle size, fully enclosed production process, no pollution, and no loss of nutrients. The ultra-fine grinding machine is all made of high-quality stainless steel to avoid the entry of other impurities; the structure of the whole machine is smooth, the material is crushed and collected sufficiently, and the loss is reduced; the grinding wheel and rail are made of special super-hard stainless steel, which is not easy to wear and has a long service life, thereby reducing the cost.
Common troubleshooting of ultra-fine grinder
Ultra-fine grinders can be divided into dry grinding and wet grinding. According to the different principles of the grinding force generated during the grinding process, dry grinding has airflow, high-frequency vibration, rotating ball (rod) grinding, hammering and self-grinding, etc.; wet grinding mainly uses colloidal grinding and Homogenizer to complete.
The host system of the ultra-fine grinder is composed of an air compressor, an air purifier system, a supersonic jet mill, a classifier, and a cyclone separator. Medium and small fluidized bed type airflow ultra-fine grinders usually combine supersonic jet mills, classifiers and cyclones into an integrated machine, which can greatly save floor space and facilitate installation, transportation and use.
Elimination of common faults of ultra-fine grinder:
1. Reverse injection at the feed inlet: improper adjustment of the air door, blockage of the conveying pipe, clogged sieve, too short powder collection bag or poor air permeability, serious wear on the edge of the hammer, etc. will cause the reverse injection at the feed inlet. When this phenomenon occurs, you should first find out the cause, and then take targeted elimination measures, or adjust the air door to clear the blockage, or exchange the powder bag to increase the air permeability, or replace the hammer.
2. Bearing overheating: When the bearing is poorly lubricated, damaged, or the main shaft is bent, the rotor is severely unbalanced, and the belt is too tight, the bearing will overheat. The bearings can be restored to normal conditions by adding or replacing lubricating oil, replacing bearings, spindles, balancing rotors, and adjusting belt tightness.
3. The grindervibrates strongly:
① If the hammers are installed incorrectly, they should be rearranged according to the requirements of the manual;
② The weight deviation of the corresponding two sets of hammers is too large, and their weight should be balanced so that the weight difference does not exceed 5 grams;
③If the bearing is damaged or the main shaft is bent, it should be replaced in time;
④ The foot connecting screws are loose and should be tightened.
4. There is abnormal sound in the grinder: the parts in the grinder are damaged or falling off, or if hard objects such as rocks or iron enter the machine, abnormal sound will be generated. Stop the machine for inspection immediately, replace the damaged parts and remove the hard objects.
5. Low production efficiency: Insufficient motor power, improper belt pulley preparation, belt slippage, severe hammer wear, uneven feeding or excessive water content of raw materials are the main reasons for low production efficiency. When the above situation occurs, corresponding measures can be taken to solve the problem, or the motor or belt pulley can be replaced to increase the speed, but the rated operating speed should not be exceeded; or the belt tightness can be adjusted, or the belt should be replaced, or the hammer can be replaced. During operation, the feed should be uniform, and a small amount should be fed quickly to maintain continuous and uniformity; the over-wet raw materials should be dried before grinding.
Installation precautions of air classifier
1. Perform a preliminary inspection of the classifier, fan and other host equipment. Whether there is any damage to the components during transportation or after long-term storage, check whether there is any foreign matter in the internal cavity of the equipment and the air duct of the fan, rotate the grading impeller and the main shaft of the fan, and observe whether Flexible rotation.
2. Check the tightness of the pre-installed parts of the equipment, and add lubricating oil to the parts that need to be lubricated.
3. Install the grading wheel to prevent collision. The grading main engine and fan should be level tested, and the level should be found with gaskets, and those with basic requirements should be fixed with the foundation.
4. Sealing gaskets should be equipped for the pipeline interfaces that require sealing.
5. After the classifier is installed, observe the running direction of the classifying motor first.
6. When installing and wiring the electric control cabinet, carefully check the corresponding relationship between the serial number of the wiring terminal and the equipment, and it should not be misplaced.
7. After installation, you can run the vehicle empty for 1-2 hours, tighten the loose bolts at any time, and carefully check the accuracy and coordination of the equipment actions.
Correct use method of ultra-fine grinder
1. The ultra-finegrinderand power unit should be installed firmly. If the ultra-fine grinder is fixed for long-term operation, it should be fixed on the cement foundation; if the grinder is mobile operation, the unit should be installed on a base made of angle iron, and the power machine (diesel engine or electric motor) and the grinder should be ensured The pulley grooves are in the same plane of rotation.
2. After the grinder is installed, check the fastening of each part of the fasteners, and tighten them if they are loose. At the same time, check whether the belt tightness is appropriate.
3. Before starting the grinding machine, turn the rotor by hand to check whether the claws, hammers and the rotor are running flexibly and reliably, whether there is any collision in the shell, and whether the rotation direction of the rotor is consistent with the direction of the machine arrow, power machine and grinding Whether the machine lubrication is good.
4. Don't change the belt pulley casually, in case the speed is too high to cause explosion in the grinding chamber, or the speed is too low to affect the working efficiency of the grinder.
5. After starting the grinding machine, it should be idling for 2~3min, and then feeding work after there is no abnormal phenomenon.
6. Pay attention to the operation of the grinder at all times during work, and feed evenly to prevent blocking the car, and do not overwork for a long time. If there are vibrations, noises, excessive temperature of the bearings and the machine body, or spraying materials, the machine should be shut down immediately for inspection, and the work should continue after troubleshooting.
Maintenance measures for the ultra-fine grinder, the machine must be cleaned up after the end of daily work. Fill the oil nozzle with lubricating oil at any time to protect the normal operation of the bearing and prolong the service life of the bearing. After working for 1000 hours, the bearing must be cleaned and replaced with calcium-based lubricant to half full to ensure good lubrication during use and prolong service life.
Factors affecting the adsorption of pulse dust collector
As the filtration time increases, more and more dust accumulates on the filter bag of the pulse dust collector, and the resistance of the filter bag increases, resulting in a gradual decrease in the processing air volume. In order for the pulse dust collector to work normally and control the resistance within a certain range, the filter bag must be cleaned. When cleaning dust, the pulse controller triggers the control valves in sequence, opens the pulse valve, and the compressed air in the air bag instantaneously sprays out into the filter bag through the pulse valve to the holes of the injection pipe. The dust attached to the surface of the filter bag falls off.
When the pulse bag filter is working normally, dust-laden gas enters the ash hopper from the air inlet. Due to the rapid expansion of the gas volume, some of the coarser dust particles fall into the ash hopper due to inertia or natural settlement, and most of the remaining dust particles follow. The airflow rises into the bag chamber. After being filtered by the filter bag, the dust particles are retained on the outside of the filter bag. The purified gas enters the upper box from the inside of the filter bag, and then is discharged into the atmosphere through the valve plate hole and the exhaust port. The purpose of dust removal.
As the filtration continues, the resistance of the dust collector also rises. When the resistance reaches a certain value, the ash cleaning controller issues a ash cleaning command. First, the lift valve plate is closed to cut off the filtered air flow; then, the ash cleaning controller pulses The solenoid valve sends out a signal, and as the pulse valve sends the high-pressure reverse airflow used for dust removal into the bag, the filter bag swells rapidly and produces strong shaking, which causes the dust on the outside of the filter bag to shake off and achieve the purpose of dust removal. Since the equipment is divided into several box areas, the above process is carried out on a box-by-box basis. When one box area is cleaning dust, the rest of the box areas are still working normally, ensuring the continuous and normal operation of the equipment. The key to the ability to handle high-concentration dust is that this strong cleaning method requires extremely short cleaning time.
The factors that affect the adsorption of the pulse dust collector are the nature of the adsorbent and the operating conditions. Only by understanding the factors that affect adsorption, can we choose suitable adsorbents and suitable operating conditions, so as to better complete the task of adsorption and separation.
1. Under normal circumstances, low-temperature operation is conducive to physical adsorption, and a proper increase in temperature is conducive to chemical adsorption. However, whether to raise or lower the temperature must be based on the adsorption melting during the adsorption process. If the melting becomes a positive value, increasing the temperature is beneficial to the adsorption operation; otherwise, lowering the temperature is beneficial to the adsorption process. The influence of temperature on gas phase adsorption is greater than that on liquid phase adsorption. For gas adsorption, pressure increase is conducive to adsorption, and pressure decrease is conducive to desorption.
2. The properties of the adsorbent, such as porosity, pore size, particle size, etc., affect the specific surface area, thereby affecting the adsorption effect. Generally speaking, the smaller the particle size of the adsorbent or the more developed the micropores, the greater the specific surface area and the greater the adsorption capacity. However, in the liquid phase adsorption process, the surface area provided by the micropores does not have a significant effect on the adsorbate with a large relative molecular mass.
3. The nature and concentration of the adsorbate have a certain influence on the gas phase adsorption. The equivalent diameter, relative molecular weight, boiling point and saturation of the adsorbate affect the adsorption capacity. If the same kind of activated carbon is used as an adsorbent, for organic substances with similar structures, the greater the relative molecular mass and unsaturation, the higher the boiling point, and the easier it is to be adsorbed. For liquid phase adsorption, the molecular polarity of the adsorbate, relative molecular weight, and solubility in the solvent affect the adsorption capacity. The greater the relative molecular mass, the stronger the polarity of the molecule, the lower the solubility, and the easier it is to be adsorbed. The higher the adsorbate concentration, the lower the adsorption capacity.
4. The activity of an adsorbent is an indicator of the adsorption capacity of the adsorbent, and it is often expressed as a percentage of the ratio of the mass of adsorption on the adsorbent to the total amount of adsorbent. Its physical meaning is the adsorption mass that can be absorbed by a unit of adsorbent.
5. Ensure that the adsorbent and the adsorbent have a certain contact time, so that the adsorption is close to equilibrium, and make full use of the adsorption capacity of the adsorbent. The time required for adsorption equilibrium depends on the adsorption rate, and the contact time is generally determined through economic trade-offs.
The performance of the adsorber of the pulse dust collector has a significant influence on the adsorption effect. The structure of the adsorber and the laying of the adsorption layer should be designed reasonably to ensure that the adsorber exerts its excellent adsorption performance.
What are the advantages of ceramic-lined jet mill
The ceramic-lined jet mill is mainly composed of a feeding device, a crushing chamber, a discharge port, a steam distribution pipe and a nozzle. The material of the feed nozzle and the grinding nozzle is made of high-strength wear-resistant and high-temperature alloy, and the nozzle structure is supersonic design; the rest of the flow parts are lined with high-strength wear-resistant and high-temperature engineering ceramics, and the feed venturi tube , The ceramic middle ring, the lining of the discharge port, the ceramic upper cover and the ceramic lower cover are made of high-strength reaction sintered silicon carbide; the steam distribution pipe and the main body cover are all made of stainless steel and polished. The appearance of the whole machine is beautiful and compact. The ceramic lined jet mill can be used in conjunction with the jet classifier. According to the physical characteristics of the material and the purity requirements of the finished product, ceramic sheets are lined inside the equipment to increase wear resistance, reduce the impact of materials on the equipment, and increase the use of the equipment Life, and control the iron content of the material in the grinding and classification process. The ceramic-lined jet mill has successfully solved a series of problems such as the adhesion of battery materials, the lack of fineness, and uneven classification.
The working principle of the ceramic-lined jet mill: After being filtered and dried, compressed air is sprayed into the grinding chamber at high speed through the Laval nozzle, and the animal material is repeatedly collided and rubbed at the intersection of the high-pressure airflow to smash. The pulverized coarse and fine mixture is under negative pressure. The fan reaches the classification zone. Under the action of the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials are separated. The materials that meet the particle size requirements are collected by the cyclone separator and dust collector through the classification wheel, and the coarse particles descend and continue to grind in the grinding zone. .
The ceramic-lined jet mill has the following performance advantages:
1. It is suitable for dry grinding of various materials with Mohs hardness below 9, especially suitable for the grinding of materials with high hardness, high purity and high added value.
2. The breakthrough of particle acceleration technology has greatly improved the grinding efficiency and reduced the energy consumption. It has small over-crushing, good particle shape, narrow particle size distribution and no large particles, and the product particle size D97=3-74 microns can be adjusted arbitrarily.
3. During the grinding process, the airflow temperature is reduced due to the rapid expansion of the airflow, which is especially suitable for the grinding of heat sensitive, low melting point and volatile materials.
4. Materials collide and grind, which is different from mechanical pulverization, which relies on the impact grinding of materials such as blades or hammers, and the addition of ceramic lining, so the equipment is less worn and the product is of high purity.
5. It can be used in series with a multi-stage air classifier to produce products with multiple particle sizes at one time.
6. The ceramic-lined jet mill is compact in structure, easy to disassemble and clean, and the inner wall is smooth and has no dead corners.
7. The entire system runs in a closed vacuum with no dust, low noise, and the production process is clean and environmentally friendly.