Types of Grinding Mills

Dry Grinding Mill

A grinding mill is an industrial tool that reduces solid materials into a desired particle size and is vital in reducing solids, such as cement, into a more manageable and powdered form. It is also used to mix solids with liquids or change the gradient of animal feed and mills come in a variety of forms suited for different tasks and challenges.

Ball Mill

A ball mill uses centrifugal force and many metal balls to grind substances into a fine powder. It is a vital tool for regrinding work and is used mainly on materials such as cement, glass and chemical fertilizer. Its primary design is a large horizontal metal cylinder with two warehouses, or compartments, containing metal balls and scale-boarded, or grooved, edges. The cylinder is then rotated to create centrifugal force to lift the balls and drop them on the material, grinding them. The first warehouse is made to start the grinding process and when the material is made fine enough, it enters through specified holes into the second warehouse, which--with different specification balls and scale boards--grinds the material into a finer powder.

Rod Grinding Mill

Rod Mill

Like a ball mill, a rod mill is a large horizontal cylinder that uses centrifugal force to grind material. However, instead of balls, it uses long metal rods that are placed almost parallel to each other and the cylinder. The walls of the grinder are also scale-boarded, so when the rods tumble, they crush the material against them. A rod mill creates a relatively unified gradient, and is great for reducing very coarse material into a size manageable by ball mills.


Attrition (or Disc) Mill

This mill does not use a cylinder principle; instead, it uses a pair of discs held close and parallel to each other to create a grinding chamber out of the resulting gap. One disc is held stationary while the other spins at great speed to grind the material until it is fine enough to exit from the gap at the edges of the disc. Some attrition mills have both discs spin at counter rotations to quicken this process. A hole is made in the center of the disc to provide a feed for the material and the gap is made smaller towards the disc's edge, making the material finer and finer before it exits the chamber.

How to Operate Ball Mills?

Energy Saving Ball Mill

If you wanted to break a stone down into sand, you might reach for a sledge hammer. But if you want to turn sand into fine dust, a ball mill would be the best tool for the job. A ball mill is specifically designed to break down a granular substance into a much finer substance by tumbling and grinding them with ceramic or metallic balls. Ball mills are used by painters, ceramicists and pyrotechnics experts to mix and refine pigments, clay compounds and explosives for fireworks.

Instructions
Prepare the Milling Chamber

1.Load your milling media into your milling chamber. Depending on your mill's capacity, and the material you wish to mill, you can add less or more media, but generally do not load the chamber more than two-thirds of the way full.

2.Add the granular material you wish to mill. Use extreme caution if milling explosive materials.

3.Screw the lid on to the top of your milling chamber or slip the cover on and affix the rubber retaining ring to secure the lid in place.

Milling Your Material

4.Turn the loaded chamber on its side and place it top of the two metal rails so that the chamber is running parallel to the rails and making contact with the rubber or plastic bushings.

5.Place the entire ball mill inside of a milling cabinet and place the cabinet outdoors, far away from buildings, cars, people, animals, direct sunlight and any explosive objects such as gas canisters, if you are milling explosive materials. Pack sand bags around the milling cabinet to form a barricade around and on top of the milling cabinet. This will protect from flying debris in the event of an explosion.

6.Plug the ball mill into an electrical outlet and turn on the milling machine's motor to begin rotating the chamber.

7.Allow the mill to run uninterrupted for several hours. The longer the mill is allowed to run, the finer the granular material will become. Occasionally, feel the motor to make sure that it is not overheating. If the motor feels hot to the touch, turn off the machine and allow it to cool down before resuming.

Removing Milled Material

8.Turn off the ball mill and unplug it from its power source. If you are milling explosive material, remove the sandbags and open the milling cabinet. Remove the milling chamber and place it on a flat surface.

9.Allow the dust to settle inside of the milling chamber before opening the container. Slowly unscrew the milling chamber's cover or remove the rubber retention ring and slide the cover off.

10.Place your fine mesh screen over your plastic or glass container. Carefully pour the contents of the ball mill out onto the screen to sift the milling media from the milled substance.

Tips & Warnings

Milling explosive materials is incredibly dangerous and could result in explosion, property damage, injury and death if not properly executed. Use extreme caution and read all instructions specific to your ball mill before operating.

Only use lead media when milling explosive material to prevent sparks and accidental ignition.

Fine granular material can be dangerous if inhaled or ingested. When emptying or cleaning your milling chamber, always wear a dust mask or respirator.

We also provide other machinery including Mineral Processing Equipment, Flotation Machines and etc, send an inquiry if you want to order. :)

What Are The Types of Ball Mills?

Ceramic Ball Mill

Ball mills are used for grinding things down or for mixing things up. They grind ores down to powders before they are chemically processed, they grind grains down to flours for baking and they mix up paints so they are smooth enough to apply. All ball mills consist of rotating cylinders that contain hard (usually metallic) balls that do the grinding. There are three types of ball mills: horizontal, vertical and industrial.

Horizontal Ball Mills

Horizontal ball mills are the most common type. The basic design is the same but the details can vary slightly. A drum, which is usually detachable, has a door that can be used to load in the material to be processed. Sometimes -- like for paint mixers -- there will be a screen that keeps the metal balls in place. When the substance to be processed (and the balls) are in the drum, the door is closed and the drum is reinstalled -- horizontally -- on the mill where it is rotated until the job is done. Some ball mills have a timer and some have a window where the processed material can be viewed.

Vertical Ball Mills

Small vertical ball mills are about the size of a blender and are intended for laboratory or shop use. They are small enough to fit on a lab table or workbench and only big enough to process the small quantities need for desktop applications -- they are not intended for commercial or industrial use. These ball mills are often called planetary ball mills. The rotating drums are not usually detachable -- the material is poured into the top and the cap is replaced, like a kitchen blender. Like all ball mills, the speed and ball size have an effect on how the vertical ball mill works. Vertical ball mills often come with a variety of ball sizes (and have variable speed settings) for more efficient processing.

Industrial Ball Mills

Industrial ball mills are much larger than the other types of ball mills. They vary in size from approximately the size of a refrigerator to approximately the size of a bus. They are always horizontal. What distinguishes the industrial ball mill (besides its large size) is that they have multiple chambers and have a forced-air system constantly moving material through the rotating drum. The different chambers are separated by screens of progressively smaller mesh. The chambers contain balls of progressively smaller size. The size of the balls and the screen mesh keeps the balls in their own chamber. Material is forced from one chamber to the next as it is ground small enough to fit through the mesh screens.

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Product: Chemical Mineral Mixer

Chemical Mineral Mixer

>Description:

Mineral Mixer
Description of Mineral Mixer: The Mineral Mixer, also known as blender, is a necessary device for the even mixing and blending of various materials used in different industries including the food, chemical, pharmaceutical, plastic and mineral industries.
The working principle of Mineral Mixer: Spinning of material closed to the bottom of the mixing bowl and chopper blade sets the entire mixing in whirling and tumbling motion. Chopper blade assembly breaks the lumps formed during mixing. Different type of chopper blades provided for various applications.
Features of Mineral Mixer:
1. High capacity
2. low energy
3. high safety

You can also check other Mineral Processing Equipment if you are interested. :)

How Does a Rock Crusher Work?

Rock Crushers Defined
A rock crusher is a device used to crush rocks into smaller pieces, usually for gravel or some other road or building application. Most rock crushers have a hopper at the top -- a container which holds the rock above the crusher and uses gravity to feed it in. Alternately, rock crushers can use a belt drive to continuously transport the rock into the crusher. At the bottom of nearly every type of crusher is a hole. Once a rock has been pressed into small enough pieces to fit through the hole, it exits the crusher either onto, a conveyor belt, into a bin or onto a large pile. In some cases, one rock crusher may feed directly into a second one, crushing the rocks up into finer and finer particles in two or three stages.

Stone Jaw Crusher

Jaw Crusher
Jaw crushers are the oldest and one of the simplest sorts of rock crushers. A jaw crusher is like a giant collapsible V made out of two metal walls. At the bottom, the two walls are very close together and at the top they are further apart. One wall is held still while the other is closed against it -- usually about three times a second. When it closes, the jaw crushes the rocks inside it. Because it tapers, the rocks are crushed to smaller and smaller sizes as they go down, then dropped through the bottom.


Roller Crusher
Another common type is the roller crusher. The roller crusher is a set of two large metal rolers rotating in opposite directions. Rocks are fed into the space between the two rollers, where they are crushed and then dropped to the ground. Roller crushers are often used as a secondary crushing stage. Small, pre-crushed rocks are inserted into the roller, which then breaks them down into gravel.


Gyratory and Stone Crushers
Gyratory and cone crushers work in pretty much the same way, although they have slightly different designs. The rock falls into the top of a chamber with a spinning grinder at the bottom. As the rock falls down, it is squeezed between the grinder and the walls of the chamber and crushed. As it continues to fall down the chamber, it is pulverized into smaller and smaller bits until it falls out the bottom.


We also provide Hammer Crusher, Cone Crusher and etc, for other crushing equipment, plz check here for more details. :)

How is the Magnetic Separation Process?

Flotation Separator

Magnetic separation is an industrial process that uses a magnetic field to separate magnetic materials from non-magnetic ones. Iron, for example is highly magnetic; magnetic separation is sometimes used to separate iron ore from surrounding silicate rock. Magnetic separation can also be used to separate ferrous materials, or materials that contain iron, from industrial waste streams before they can contaminate water supplies.

Magnetic fields
When any mineral is exposed to a magnetic field, it is either drawn by the field or not. Particles that are drawn to the field are called magnetic. There are different sorts of magnetic separators, but the most common is the drum. Essentially a stream of material is dropped onto the outside of a magnetic drum. Non-magnetic or weakly magnetic particles bounce or fall off of the drum. The remaining magnetic particles stick to it until they are scraped off.

Impact grinding
Sometimes, after passing around the first drum, the remaining material hits what is called an impact grinder or impact mill. The impact grinder contains a rapidly spinning wheel that increases the speed of the falling material. The particles then strike what is called an impact block, shattering into even smaller bits. Some mining companies order custom-made grinders that reach several stories high. The smashing of the non-metallic leftovers often reveals particles that are metallic but were covered in non-metallic matter and did not stick to the drum originally.

Sieving
The pieces, which can be as small as half an inch around, then fall onto a screen. The tiniest bits, which are most likely sand particles, are sieved through the screen. These bits of worthless rock and other silicates are called gangue. The gangue is generally discarded. After this screening process, the remaining material is then further dropped onto a second magnetic drum where the process repeats. What material remains will be metal concentrate.


Cost and Types
Magnetic separation is a popular and low-cost method of recovering metals. In addition to the drum method, many other types of separators exist. These include, but are not limited to, pulleys, discs, belts and rings. Magnetic separation is used primarily by mining industries but also by environmentalists on industrial wastes and even by those who study space materials. Magnetic separators can be used either "wet" or "dry" and come in countless shapes and sizes.

We can provide Wet Magnetic Separator & Dry Magnetic Separator, any more problems plz feel free to ask us.:)

What's the Types of Cement Kilns?

Cement Kiln

Cement kilns are used to produce hydraulic cement. The process involves the grinding and mixture of limestone and clay. The raw mixture is heated in the cement kiln to a temperature of 1,500 degrees Celsius (2,732 degrees Fahrenheit), and then it is ground through a process called "clinker" and then made into cement. There are different types of cement kilns that are involved in the production of cement.

Wet Process Kilns
The wet process kiln was the main cement kiln used in the 20th century. They were the original rotary cement kilns. With wet process kilns, the raw material is made into a mixture called "slurry," which usually contains 40 percent water. The poor fuel efficiency of these types of kilns became an issue in the 1970s when the cost of fuel went up. Since that time, fewer wet kilns have been manufactured.

Dry Process Kilns
The dry process kiln is similar to the wet process kiln, but it has a better fuel consumption. This is so because the material that is fed into the kiln is dry. Two common ingredients that are used in concrete production with dry process kilns are limestone and shale. The ingredients are ground together into a raw meal. This is then fed through the top of the preheater tower.

Preheater/Precalciner Kilns
The preheater or precalciner kilns contain tall preheater towers. These towers use the heat from the kiln to preheat the raw materials. A benefit of these kilns is their fuel efficiency. They use 50 percent less energy that the dry process kiln.

We also provide other rotary kilns such as Rotary Lime Kiln, Clinker Kiln and etc, visit our web to know more info about mining machinery! :)

Product: Mining Dryer

Mining Dryer

>Description:
The working principle of mining dryer:
After the wet material is added into the dryer, the material displays and disperses uniformly in the dryer by the stir of shoveling plate uniformly distributed in barrel. Then contact with the hot countercurrent air fully and speed up the heat transmission, and mass transfer. In the process of drying, the material can move to the other star-shape discharge valve end of dryer and eject the finished product by the function of tilt shoveling plate and hot air current. The mining dryer is applicable to the large particles with large specific weight in chemical engineering, mining, and metallurgy industries, such as ore, blast furnace slag, coal, metal powder, phosphatic fertilizer, and ammonium sulfate. And it also applicable to the drying of powdery, particle material with special requirements, such as HP foaming agent, distilled grain slag, light, Calcium carbonate, activated clay, magnetic powder, black lead, and decoction dregs which need low temperature drying and mass continuous drying.
Technical parameters of mining drier machine:

Specification	Capacity (t/h)	Motor		Main gear box		Weight (T)
		Power(kw)	Model	Model	Speed reduction ratio
0.6×8m	0.5-0.8	4	T160m-R3	TD50-16-1	8	5.1
0.8×10	0.9-1.5	4	T 160M-R3	TD 50-16-1	7.2	6.9
1.0×10	1.8-2.3	5.5	T 160M-R3	TD 50-16-1	6.73	7.5
Φ1.2×10m	2.5	7.5	T 160M-R3	TD 50-16-I	6.5	13.5
Φ1.5×12m	3.3-4.9	10	T 160L-6-B3	TD 500-3-2F	4.8	18.9
Φ1.5×15m	4-6	11	T 200L1-6	TD 500-3-2F	3.5	21
Φ1.8×12m	4-6	18.5	T 160L-6	TD 50-16-2-2	16.46	22.83
Φ2.2×12m	7-12	18.5	T 200L7-6	TD 650-3	31.5	37.6
Φ2.2×14m	7-12	18.5	T 200L7-6	TD 650-2	31.5	40
Φ2.2×16m	12	30	T 225M-6	TD 750-2	31.5	45
Φ2.4×14m	12	30	T 250M-6	TD 750-2	31.5	51
Φ2.4×18m	10-13	37	T 250M-6	TD 85-13-1	27.16	54
Φ2.4×20m	10-14	37	T 250N-6	TD 85-13-I	27.16	54.14
Φ3×20m	25	55	T 250M-4	TD 100-16-I	41.52	78
Φ3×25m	32-36	75	T 280M-4	TD 100-16-I	41.52	104.9

For other rotary dryers, plz check here. Any more problems plz feel free to contact us.

Wiki: What is A Rod Mill?

Rod Grinding Mill

Rod mill is a rotating drum causes friction and attrition between steel rods and ore particles. But note that the term 'rod mill' is also used as a synonym for a slitting mill, which makes rods of iron or other metal. Rod mills are less common than ball mills for grinding minerals.

The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency.

For other rod mills, plz check rod ball mill.
We also provide Rotary Dryers, Crushing Equipment and etc, if you're interested in our products, plz visit us by here. :)

Wiki: What is A Ball Mill?

Coal Ball Bill

A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints. Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles and stainless steel balls. An internal cascading effect reduces the material to a fine powder. Industrial ball mills can operate continuously, fed at one end and discharged at the other end. Large to medium-sized ball mills are mechanically rotated on their axis, but small ones normally consist of a cylindrical capped container that sits on two drive shafts (pulleys and belts are used to transmit rotary motion). A rock tumbler functions on the same principle. Ball mills are also used in pyrotechnics and the manufacture of black powder, but cannot be used in the preparation of some pyrotechnic mixtures such as flash powder because of their sensitivity to impact. High-quality ball mills are potentially expensive and can grind mixture particles to as small as 5 nm, enormously increasing surface area and reaction rates. The grinding works on the principle of critical speed. The critical speed can be understood as that speed after which the steel balls (which are responsible for the grinding of particles) start rotating along the direction of the cylindrical device; thus causing no further grinding.
Ball mills are used extensively in the Mechanical alloying process in which they are not only used for grinding but for cold welding as well, with the purpose of producing alloys from powders.
The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous non-ferrous metals. The ball mill can grind various ores and other materials either wet or dry. There are two kinds of ball mill, grate type and overfall type due to different ways of discharging material. There are many types of grinding media suitable for use in a ball mill, each material having its own specific properties and advantages. Key properties of grinding media are size, density, hardness, and composition.

• Size: The smaller the media particles, the smaller the particle size of the final product. At the same time, the grinding media particles should be substantially larger than the largest pieces of material to be ground.
• Density: The media should be denser than the material being ground. It becomes a problem if the grinding media floats on top of the material to be ground.
• Hardness: The grinding media needs to be durable enough to grind the material, but where possible should not be so tough that it also wears down the tumbler at a fast pace.
• Composition: Various grinding applications have special requirements. Some of these requirements are based on the fact that some of the grinding media will be in the finished product. Others are based in how the media will react with the material being ground.
• Where the color of the finished product is important, the color and material of the grinding media must be considered.
• Where low contamination is important, the grinding media may be selected for ease of separation from the finished product (i.e.: steel dust produced from stainless steel media can be magnetically separated from non-ferrous products). An alternative to separation is to use media of the same material as the product being ground.
• Flammable products have a tendency to become explosive in powder form. Steel media may spark, becoming an ignition source for these products. Either wet-grinding, or non-sparking media such as ceramic or lead must be selected.
• Some media, such as iron, may react with corrosive materials. For this reason, stainless steel, ceramic, and flint grinding media may each be used when corrosive substances are present during grinding.

The grinding chamber can also be filled with an inert shield gas that does not react with the material being ground, to prevent oxidation or explosive reactions that could occur with ambient air inside the mill.(WIKI)

For more ball mill products, plz check here to see the details.

About Us: Shanghai Esong Mining Machinery Co., Ltd.

Shanghai Esong is a major mining and crushing machine manufacturer in China. Our factory, which covers 66000 square meters, specializes in the manufacture of large and medium-sized mineral processing equipment, metallurgy equipment, and construction machinery. Since our inception, we have continuously sought out the most highly skilled managers and technicians to join our team. Through a modern managerial approach, we can accumulate management and production experience. This is how Esong has become a technically-advanced mining crusher-machine manufacturer in China.
Currently, we have over 100 staff members, 30intermediate and senior engineers, and 50-plus technicians. Our company is located in Shanghai, where we are in close proximity to an international port, highways, and airports, for convenient transportation. This enables us to reduce our manufacturing cost, and also save our customers on international shipping.
Products and Applications
With the rapid development in the economy and technology, infrastructure construction and resource conservation become important. As one of the largest processing-machinery manufacturers, Esong has perfected our manufacturing and management techniques. We offer a full line of crushing machines, mineral processing equipment, cement production lines, rolling mill equipment, fertilizer equipment, etc. These products are of reliable quality and provide stable performance, in the mining, metallurgy, construction, road, railway, water conservation, and chemical industries. Some of our most popular machines are: jaw crushers, hammer crushers, gravel production lines, ball mills, and rotary kilns. They are well received by crushing plants, cement plants, lime plants, and dressing plants in many countries around the world.
Quality and Cost Control
In order to provide high quality, competitively-priced crushing machines and mineral processing equipment to our global customers, we give much attention to cooperating with internationally advanced scientific research units. We import advanced production lines and testing equipment, and adopt the most advanced technology from foreign countries.
In quality control and management, we strictly comply with international standards. Our quality control department strictly inspects raw materials and every aspect of production. We have specialized teams who do random inspections, in addition to testing all final products. This way we can ensure the quality of our impact crushers, double roller crushers, sand-washing machines, etc. Strict management and making the best use of our resources, both labor and raw materials, in addition to much automation in our plants, enables us to provide high quality machinery at the most competitive prices.
Over the past 20-plus years, we at Esong have perfected our manufacturing techniques, strict managerial system, and effective employee interaction. Our company has become one of largest machinery processing bases in China. Our crushing machines, magnetic separators, mineral processing equipment, rotary kilns, dryers, etc. are widely praised by customers.
After-sale Services
Quality is the key to a company's success. Thus, our after-sale-service is part of our quality guarantee. We offer a one year guarantee on our products, and we also provide spare, wearing parts to our customers. Our experienced and skilled sales service team is also available to handle any problems you may encounter. Thus, you can feel secure in using our machines for your crushing, or other processing needs. Esong welcomes global customers and agents to contact us!

Add: No.1515, Luoning Road, Baoshan Industrial Zone, Baoshan District, Shanghai, China
P.C.: 200949
Contact Person: Helen Chen
Mobile: 0086-15821856805
Tel: 0086-21-60820908
Fax: 0086-21-60820909
Email: admin@zgesong.com
Website: http://www.esongballmill.com