What is the difference between wet grinding and dry grinding?

What is the difference between wet grinding and dry grinding? The process of wet grinding and dry grinding involves countless products that we use every day. Wet and dry methods are the two most common and effective crushing methods, and both have advantages, disadvantages, and specific challenges that can complicate the process. Whether a product is wet or dry depends on a variety of factors, including raw materials, target particle size, particle surface and shape requirements, and final application.

Definition：

The terms wet grinding and dry grinding are general concepts and have little effect on the actual description of the processes and forces involved. However, some methods can only be used under wet conditions, while others require dry conditions. Although the goal of both grinding methods is to reduce the particle size to the target range, the process is different. Typically, the dry method uses particle-to-particle impact to reduce size, while the wet method involves dispersing the raw material in the liquid and circulating the resulting liquid to crush the particle onto a solid grinding medium to reduce its size.

Working Principle:

Working Principle of Dry Grinding:

First, the principle of air mill

According to the kinetic energy formula E=½mv2. The kinetic energy is proportional to the square of the mass and the velocity. The original grinding machinery is limited by the mechanical linear speed (general mechanical linear speed v<2OOm/s), so it is very difficult to obtain ultrafine particles. The airflow pulverizer produces a very high flow rate, especially the supersonic airflow pulverizer produces a fluid several times the speed of sound, and obtains a huge kinetic energy. It makes it easy for products to obtain ultrafine particles at the micron and sub-micron levels. Air flow mill is a fluid compressed air as the working medium to crush the powder equipment, fluid pressure can be converted into speed energy through the air flow mill. Act on the powder. The pulverized material produces intense collision, friction and shear in the crushing chamber. Crushing occurs when the force acting on the powder is greater than the allowable stress of the powder. The high speed impact makes the powder produce volume crushing. The friction and shear action make the powder form a surface crushing, so that the surface of the powder product is relatively smooth. It has an ideal particle morphology. Therefore, the performance of the product after being crushed by the air mill has also been improved;

Second, the grinding and classification process of the air mill

The high speed jet formed by the pressure gas through the charging ejector makes the crushing raw material shoot into the crushing chamber. The peripheral grinding nozzles directionally spray high velocity air into the grinding chamber. Make the powder between the intense collision, shear, friction. Thus crushed
The centrifugal force generated by the strong swirling flow formed by the high-speed jet in the grinding room makes the powder particles move at high speed outside the grinding room. When particles are crushed to a fractional size. Due to the reduction of centrifugal force, it is separated from the fractional swirl by centripetal air flow and enters the trapping system through the central outlet.
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Flow crusher is often combined with cyclone separator, dust collector and induced draft fan to form a complete set of crushing system. After the compressed air is filtered and dried, it is sprayed into the grinding chamber through the nozzle at a high speed. The materials are crushed by repeated collision, friction and shear at the intersection of multiple high-pressure air streams. The crushed materials move to the classification area with the updraft under the action of the fan, and the coarse and fine materials are separated under the powerful centrifugal force generated by the high-speed rotating classification turbine. The fine particles that meet the particle size requirements enter the cyclone separator and dust collector through the grading wheel, and the coarse particles fall to the grinding zone and continue to be crushed.

Characteristics of air flow mill

1, suitable for dry brittle material crushing, impact speed is large, under normal circumstances it is easy to obtain micron and sub-micron particle size.
2, the compressed gas through the nozzle due to the adiabatic expansion of the cooling effect, so that the crushing at low temperatures, especially suitable for the heat sensitive, low melting point material crushing.
3, because the grinding mechanism is mainly the self-grinding of particles, the product is not easy to be polluted by other substances, and high purity products can be obtained.
4, according to different nature of the material. The suitable lining material is selected to solve the problem caused by hard materials and viscous materials in crushing. And further ensure that it is not contaminated by metal.
5, the production process is carried out in a closed pipeline, no dust flying, noise below 70dB. It has the advantages of low noise, no vibration and less environmental pollution.
6, simple structure, easy to disassemble, clean and operate. Small footprint, no moving parts. In addition to the normal wear of the lining, other parts are generally not easy to damage, basically trouble-free.
7, can achieve continuous production and automatic operation, in the crushing process also obtain mixing and dispersion effect.

Four, the main factors affecting the fineness of grinding

1. Material nature
   Generally speaking, the air flow crushing function is suitable for the crushing of all brittle materials. However, due to the different properties of the material, its crushing performance is not the same, such as the strength, density, hardness, viscosity, shape, electrical properties of various materials are different. It will inevitably lead to the difference of crushing results, in which the strength of the material is the most important factor. In addition, the excessive moisture content of some materials or the water and oil content in the air source will also change the performance of the crushed material (such as the increase of toughness and viscosity), thus affecting the fineness of the crushing.
2. Processing capacity
   Because the same material is not the same, the fineness of crushing is not the same. Generally speaking, the processing capacity is proportional to the particle size of the product. But if the amount is too small. Less chance of interparticle collision affects fineness.
   3, the working pressure of gas
   The principle of air crushing is to convert the pressure energy of the fluid into the speed energy to complete, so the greater the gas pressure, the injection velocity is also relatively increased, improving the crushing energy, that is, the crushing effect.
3. Feed particle size
   The same material, due to the different feed particle size, the particle size of the crushed product is also different, the smaller the feed particle size, the smaller the particle size of the product.
4. Particle size distribution of raw materials
   If the particle size of the feed is more uniform, the fineness and particle size distribution of the product is better, if the particle size of the feed is very different, the collision result between the coarse particles and the fine particles in the crushing process will inevitably affect the crushing effect.
5. Single material and mixture
   Due to the difference in the nature of various components in the mixture, crushing will produce soft and hard particles or high strength and low strength particles impact each other and other conditions, which will affect the effect of crushing.
6. The influence of back pressure
   The back pressure is the average pressure of the gas in the crushing room, because the size of the jet speed of the crushing nozzle is mainly determined by the difference between the inlet pressure and the outlet pressure of the nozzle, the greater the pressure difference, the higher the flow rate. Therefore, the increase of back pressure is not conducive to crushing. In production, due to the increase of the resistance of the trap system, the back pressure of the crusher will be increased. To affect the crushing effect, the resistance of the trapping system should be checked frequently.

Wet Grinding Working Principle:

Principle Wet mill is by the motor through the belt drive gear (or rotor) and matching fixed teeth (or stator) for relative speed rotation, the processed material through its own weight or external pressure (can be produced by the pump) pressure to produce downward spiral impact force, Through colloidal grinding, the gap between the teeth (the gap can be adjusted) is subject to strong shear force, friction, high frequency vibration and other physical effects, so that the material is emulsified, dispersed and crushed by youxiao, and the effect of ultrafine crushing and emulsification of the material.
The refining effect of the wet mill is generally stronger than that of the homogenizer, but it has a strong adaptability to the material (such as high viscosity, large particles), so in many cases, it is used for the front of the homogenizer or for the occasion of high viscosity.
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Structural wet mill is a high-tech product composed of colloid mill and dispersion unit.
The first stage consists of three serrated protrusions and grooves with increasing fineness. The stator can be adjusted to the desired distance from the rotor without limitation. Under enhanced fluid turbulence, the groove can change direction at each stage.
The er stage consists of a rotating stator. The dispersion head is also well designed to meet the needs of different viscosities and particle sizes. The difference in the design of the in-line stator and rotor (emulsified head) and the working head of the batch machine is mainly because of the requirements for transportability. The difference between coarse precision, medium precision, fine precision and some other working head types is not only the arrangement of the specified rotor teeth, but also a very important difference is the geometric characteristics of different working heads. The number of slots, the width of slots, and other geometric features can change the different functions of the stator and rotor working heads. Based on past practice, work heads are assigned based on previous experience to meet a specific application. In most cases, the construction of the machine is matched to the specific application, so it is important to produce the final product. When it is uncertain whether the construction of a working head meets the intended application.
The line speed of the CMD2000 series is very high, and the shear gap fei is often small, so that when the material passes through, the friction formed is more intense, and the result is commonly referred to as wet grinding. The rotor is made into a circular vertebrae with three serrated protrusions and grooves of increasing finness. The stator can be adjusted to the desired distance from the rotor without limitation. Under enhanced fluid turbulence, the groove can change direction at each stage. High quality surface polishing and structural materials to meet a wide range of requirements in different industries.

Application of Wet and Dry Grinding:

• Chemical industry: Paints, pigments, dyes, coatings, lubricants, greases, diesel, petroleum catalysts, emulsified asphalt, adhesives, detergents, plastics, glass fiber, leather, white carbon black, silica, titanium bai powder, carbon black, graphene, carbon nanotubes, fullerenes, gels, sols, fracturing fluid catalyst fibers, etc.
• Food Industry: Milk, soy milk, fruit juice, rice milk, jam, jelly, cheese, salad dressing, ice cream, chocolate, food additives, edible flavors, CMC and denatured starch and other thickening agents quickly dissolve, aloe vera, pineapple, sesame, fruit tea, ice cream, mooncake filling, cream, jam, juice, soy, soy paste, peanut milk, protein milk, soy milk, almond milk, walnut milk Dairy products, malted milk essence, flavor, various beverages peanut butter, bean paste, mushroom paste, hot sauce, shrimp paste, mayonnaise, salad dressing, cheese edible mycelium, soybean egg bai powder soybean meal；
• Daily chemical: toothpaste, detergent, shampoo, shoe polish, # grade cosmetics, bath essence, soap, balm BB cream, etc.
• Pharmaceutical Industry: Various syrups, nutritional solution, proprietary Chinese medicine, poultices, biological products, cod liver oil, pollen, royal jelly, vaccines, various ointments, various oral liquid, injection, suspension injection, fat milk, intravenous drops, emulsified pig skin, capsules, microspheres, oral suspension, animal tissue wall breaking, Cellulose ointment, ointment, cream, fat milk, cell tissue crushing, sugar coating, filler dispersion, etc.
• Building industry: Various coatings. Including interior and exterior paint, anti-corrosion and waterproof paint, cold porcelain paint, colorful paint, ceramic glaze and so on.
• Other industries: plastic industry, textile industry, paper industry, coal flotation agent, nanomaterials and other industries high-quality environmental protection production needs.
• New energy materials: graphene, carbon nanotubes, carbon fiber, lithium battery slurry, battery separator lubricating oil and so on.

The difference between Wet and Dry Grinding:

Dry grinding is a relatively simple process. In a jet mill, the raw material moves within an enclosed area, either colliding with other particles or hitting machine parts (such as rotors) until the raw material breaks down into the desired size.
In wet grinding, on the other hand, the particles are dispersed in a liquid that is pumped through the grinding chamber. The particles move in the liquid and are crushed in the grinding medium.
Dry grinding, such as air grinding, using one-way process; The material enters the mill, passes through and is discharged, and the size is reduced. In contrast, wet grinding uses a recirculation process. The liquid is repeatedly exposed to the grinding medium for several hours if needed until the desired particle size is reached.
Although the two grinding methods differ, both dry and wet methods face a common challenge: the potential wear and tear of the grinding equipment, which over time can damage components and contaminate the product.
In wet and dry methods, raw materials can wear out and damage the equipment due to repeated collisions with machine parts, and in the case of wet methods, collision with grinding media. In addition, the liquid used in the wet process needs to be chemically compatible with the raw material. Whether it is water, oil, solvent or surfactant, the liquid will attack the grinding medium, agitator or other components.
Whether dry or wet, it is vital that equipment particles and grinding media are kept away from the final product.

Advantages and disadvantages:

The advantages and disadvantages of dry grinding and wet grinding are analyzed as follows:

• Advantages: After dry processing, the surface of the particles is smooth and there is no adhesive, which can reduce the dispersion of the mixture, improve the specific surface area, and help to enhance the hydrolysis process; The equipment operation is simple and easy to control, and it is easy to realize automatic operation in production. The wet grinding process can reduce the heat consumption by using the heat absorption of water evaporation in the waste slag, and can also slow down the temperature rise of the material to avoid overburning. Wet powder wear to the equipment is relatively mild, easy to continuous, semi-continuous and equipment replacement and other favorable factors. For some materials, the use of wet crushing can better reflect its advantages, such as toughness and easy to plug the mouth of the material should be pre-treated with liquid lubrication materials, and then artificial fine powder or special treatment into small pieces of material for pressing or drying and crushing rice and other methods to carry out advance technical preparation work to ensure the smooth development of the work
  Disadvantages: Compared with dry grinding, the wet process requires more water and energy, and a large amount of waste gas will be generated during the preparation of ultrafine particles, and the resulting slurry is not easy to transport and treat. In addition, the complexity of the wet crushing system is high, it is difficult to control the distribution of different components in the finished product, due to the existence of unstable systems such as emulsion and suspension, storage and packaging are also difficult. If you want to obtain a certain average particle size of qualified products is very difficult, and will seriously affect the quality and smoothness of the product, by the production line environment and site and other restrictions, generally suitable for self-employed and small workshops to make poor market prospects of products and change their traditional backward mode of business to modern advanced direction of development of a choice to change one of the ways.

Summary

• 1, the air mill is mainly dispersed by dry powder, and the high shear dispersion machine is wet grinding
• 2, the air mill is often used with multiple equipment in the system, and the high shear dispersion machine can complete the dispersion crushing in a single set.There is the possibility of dust pollution in the air flow mill, and there is no dust pollution in the wet method of the high shear dispersion machine.
• 3, the air mill has limitations for the crushing of the material, for the material itself water or oil, can not be directly crushed, high shear dispersion machine is better versatility.
• 4 Dry method temperature resistance Wet method temperature resistance.

Food Producing Process Flow:

Ultrafine grinding is one of the very key procedure in whole production line. It depends how many mesh that customer need to produce. That’s to say this machine can decide what kind of material will get finally before mxing.

Coarse Crusher Machine —>Grinding Machine —> Vibrating Table Sifter Machine—>Mixing Machine—>Packing Machine —> (Printed Packaging Film Roll or bags ) —> Filling, sealing machine, capping and Labeling Machine —>Pack into Box.

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CH Horizontal Mixer

CH Tank Type Horizontal Mixer Universal Grinder Youtube Video (See More) About LKMixer LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds, potato, bean, tobacco, salt, cannabis, tea, Sugar,…

WZ Paddle Mixer

WZ Weightless Biaxial Paddle Mixer Universal Grinder Youtube Video (See More) FAQ(Click and See More) Recommend Reading

CH-VI Tumble Blender

WLD Horizontal Spiral Ribbon Mixer Universal Grinder Youtube Video (See More) FAQ(Click and See More) Recommend Reading

WLD Ribbon Blender

WLD Horizontal Spiral Ribbon Mixer Universal Grinder Youtube Video (See More) About LKMixer LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds, potato, bean, tobacco, salt, cannabis, tea, Sugar,…

YH Dry Powder Mixer

YH One Dimensional Mixer Dry Powder Mixer Youtube Video (See More) V Type Dry Powder Mixer Ribbon Dry Powder Mixer Cone Dry Powder Mixer Customization Dry Powder Mixer According to your Capacity: We can customize the capacity according to your special requirement, we can also customize the Dry Powder Mixer connect with your production line…

W Double Cone Blender

W Type Double Cone Mixer Universal Grinder Youtube Video (See More) About LKMixer LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds, potato, bean, tobacco, salt, cannabis, tea, Sugar,…

GHJ V Blender High Efficient

About LKMixer LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds, potato, bean, tobacco, salt, cannabis, tea, Sugar, corn, Coffee, rice, pepper, grain as so on. Grinders have many…

WCH Horizontal Tank Mixer

WCH Double Pulp Tank Mixer Electric Mixer Tank for Sale (Stainless Steel): Universal Grinder Youtube Video (See More) About LKMixer LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds,…

FZH Pharmaceutical Mixer

FZH Square Cone Mixer Universal Grinder Youtube Video (See More) About LKMixer LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds, potato, bean, tobacco, salt, cannabis, tea, Sugar, corn,…

SHJ Commercial Spiral Mixer

Industrial Dual Spiral Mixer Universal Grinder Youtube Video (See More) About LKMixer LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds, potato, bean, tobacco, salt, cannabis, tea, Sugar, corn,…

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