How do Vibrating Screens work?

 

 

Vibrating screens have been widely used in mining, metallurgy, coal, water conservancy, transport, and chemical industries to complete numerous processes, such as screening, grading, washing, de-intermediation, and also dehydration of materials. As an intermediate web link between mining as well as smelting, mineral processing effectiveness not just directly impacts mineral processing productivity yet additionally has an extensive effect on the logical use of national sources.

 

The vibrating screen works by utilizing the double-rotation vibration created by the vibrator. The upper turning weight of the vibrator makes the screen surface shake in an airplane, while the reduced turning weight makes the screen surface shake the cone surface. Its combined impact The impact is that the screen surface produces double-rotating vibration. Its vibration trajectory is a complicated spatial contour. The curve is predicted as a circle on the horizontal plane and forecasted as an ellipse on the vertical plane. The amplitude can be changed by readjusting the excitation pressure of the top as well as reducing rotating weights. Changing the spatial phase angle of the upper and also reduced weights can change the contour form of the screen surface movement trajectory and change the movement trajectory of the material on the screen surface.

Types of Vibrating Screens

Vibrating screen equipment can be split right into vibrating mining screen, light, great vibrating screen, as well as experimental vibrating screen according to its weight.

Mine vibrating screens can be split into durable screens, self-centering vibrating screens, elliptical exerciser vibrating screens, dewatering screens, circular vibrating screens, banana screens, linear vibrating screens, etc.

Light, great vibrating screen can be divided into rotating vibrating screen, linear screen, straight row screen, ultrasonic vibrating screen, filter screen, and so on

Experimental vibrating screen: waving screen, top-strike vibrating screen, standard examination screen, electric vibrating screen, etc.

According to the material running track of the vibrating screen, it can be separated right into

According to the linear motion trajectory: linear vibrating screen (the material moves on the screen surface in a straight line);

According to the circular motion trajectory: circular vibrating screen (materials move circularly on the screen surface);

According to the reciprocating motion trajectory: great screening machine (materials reciprocate onward on the drying surface).

 

The specific workflow of vibrating screen

 

Recently, although vibrating screening machinery has actually achieved extraordinary development, the theoretical framework of vibrating screens has been secure and becoming mature. Numerous sorts of vibrating screens have actually been presented one after one more. However, vibrating screens with high screening efficiency and also big outcome have actually constantly been vibrating—the new instructions of filter r & d.

 

The coal or ore extracted in the mining field, or the smashed material, before the material is used or better refined, it requires to be divided right into several grades of similar bit size or be dried out, de-intermediated, de-slimed, and also often a combination of a number of items. Yes. When doing the above work, there is always the trouble of grading materials via the holes of the screen surface, and the grading of materials with the holes of the screen surface is called sieving. With the research study on the screening process of materials, it is discovered that the screening of materials can be divided into two phases.

 

1. Fine-grained materials smaller than the mesh size get to the screen surface with the material layer made up of grainy materials.

2. The great bit material passes through the sieve holes on the sieve surface to complete the sieve.

 

When the vibrating screen is functioning, both motors synchronously and reversely revolve to make the exciter produce a reverse excitation pressure, requiring the screen body to drive the screen to relocate longitudinally to make sure that the material is on it is periodically thrown onward for a range because of the excitation pressure. So regarding finishing the material screening operation. It is appropriate for screening sand as well as gravel materials in quarries and can likewise be used for product classification in coal preparation, mineral processing, developing materials, electrical power as well as chemical industries.

 

The functioning part of the vibrating screen is dealt with, and also the material is evaluated by sliding along the working surface. Repaired grid filter is among the most extensively used in concentrators, generally used for pre-screening before rugged squashing or medium squashing. It has a basic structure as well as is convenient to make. It does not take in power and also can directly dump the ore onto the screen surface. The primary drawbacks are low performance as well as low screening efficiency, usually just 50-60%. The working surface of the vibrating screen is composed of flat prepared rolling shafts. There are plates on the shafts, and fine-grained materials pass through the spaces between the rollers or plates.

 

In order to smoothly complete the screening process of the material, the problem of relative movement between the material and the screen surface needs to be pleased. For that reason, the screen box of the vibrating screen must have suitable movement characteristics. On the one hand, it can make the material on the screen surface become loose.

 

On the other hand, it can make the crude particles obstructed on the sieve holes leave and also maintain the fine-grained materials efficiently with the filter. In the real manufacturing process, the actual screening process is: "After a lot of busted materials with different fragment sizes and mixed crude as well as fine bits get in the screen surface, only a part of the material calls the screen surface. In this part of the material getting in touch with the screen surfa., It is not entirely a great particle material smaller sized than the mesh size,.

The majority of the continuing to be great bits smaller sized than the mesh size are distributed throughout the entire material layer.

 

Via the movement of the screen box, the material layer on the screen surface is loosened, to ensure that the void that exists between the huge particles is further expanded, and the small particles seize the day to go through the gap and also transfer to the reduced layer; at the same time, because of the little particles between the materials The void is small, as well as large bits can not travel through. Therefore, the position of huge particles enhances constantly thro that the movement. Because of this, the initial untidy material bit team separates, that is, it is split according to the fragment size, forming an arrangement rule with little bits under and coarse fragments on the top.

 

The fine bit material that gets to the screen surface, because its size is smaller sized than the screen opening size, can efficiently pass through the screen, and lastly recognize the separation of coarse and also great particle materials as well as finish the screening process." Nonetheless, sufficient separation is impossible. In time-sharing, there is typically a part of the great bits continuing to be in the crude fragments on the filter and also can not permeate the sieve. Research shows that although the size of the fine fragments is smaller than the sieve hole, the problem of their infiltration is not the exact same. Compared to screen holes, the smaller sized the particle size, the less complicated it is to penetrate the sieve, and the other way around, the more difficult it is.

How to maintain slurry pump？

Like many other machines, slurry pumps require regular maintenance to operate optimally and reliably. Without proper maintenance, the pump may fail catastrophically, resulting in unplanned maintenance, potential injury and facility shutdown. Even if they do not fail, poorly maintained pumps may lose a full 15% efficiency, causing pump owners to pay a price, reduce output and damage their bottom line. Moreover, although the pump owner and operator can perform some maintenance by themselves, in some cases, professional personnel need to be called. Don't wait for problems with your pump: customize this slurry pump maintenance guide to meet your business needs, and then follow it to keep your pump in optimal operation.

 

Daily maintenance

Although this maintenance list may seem long at first glance, its various projects can often be completed quickly and easily. Although they seem insignificant, these daily steps are the key to maintaining pump efficiency.

Checklist.jpg check the oil, but only when the pump is not running.

If the temperature suddenly increases or decreases, check the bearing.

Check the stuffing box and adjust as necessary.

Monitor all instruments and instruments consistently.

Look for leaks. If the drain hole of the pump casing leaks, replace the lining.

Follow up gland service pressure as changes may indicate further problems. Blocked pipes or poorly functioning stuffing boxes may change the gland working pressure.

Check the V-belt drive, especially those installed in recent days. The new V-belt will stretch and needs to be re tensioned as soon as possible.

 

Weekly maintenance

Don't forget weekly maintenance! Although these two tasks will increase your weekly routine maintenance needs, they are essential to track and ensure pump efficiency.

Readjust the impeller as required.

Record the meter reading.

 

Quarterly maintenance

Quarterly tasks involve more practical work and may require the attention of skilled on-the-job mechanics, but they may mean the difference between a well functioning pump and a catastrophic failure.

Empty the used lubricating oil and replace it with a new one.

Check the V-belt for signs of wear and ensure proper tension. Clean the V-belt and pulley groove.

Clean and oil the studs and threads on the motor base and gland.

Check the stuffing box for wear and repack.

Semiannual maintenance

Last but not least, semi annual maintenance tasks are important because they do not check the pump components, but the whole pump.

Check the whole pump thoroughly.

Clean the bearing and bearing housing and refill with new oil.

Check and flush drain and seal water pipes.

Check that the pump and motor are aligned.

Accurate and up-to-date records must be maintained using a consistent method at all maintenance stages. If more than one employee in your factory records instrument and meter readings, make sure they follow the same procedure every time, so that they can read and compare the records. Of course, if you find any change in the sound of the pump, please check the pump as soon as possible. By performing these tasks several additional times a day, week, and year, you can keep your pump running at its best - rather than dealing with poorly maintained pumps that cause problems or stop completely.

 

Slurry Pump vs Mud Pump: Why Do I Need A Slurry Pump?

The concept of slurry pump and mud pump is very close, and many people don't know it very well. Although the slurry pump and mud pump are impurity pumps, if you have a full understanding of these two pumps, you can clearly distinguish them from the characteristics of application and transmission medium. What is the difference between slurry pump and mud pump? Four aspects to distinguish slurry pump and mud pump.

 

Applications

Slurry pumps are mainly used in industrials of mining, metallurgy, dredge, power, coal and other solid slurry transport. Mud pumps are mainly used for drilling, pharmaceutical, brewing, paper, and other industries, which used to transport suspension.

 

Working principle of pump

The mud pump is a motor that drives the piston through the connecting rod mechanism. This will lead to the change of the sealing cavity volume of the mud pump. And the change of pressure difference inside and outside the pump. Finally, complete the process of water absorption and drainage. When the slurry pump works, the motor drives the impeller to rotate. That is, the impeller works on the slurry and increases the kinetic energy of the slurry. At the same time, the slurry flows to the edge of the impeller due to inertia and is discharged from the discharge pipe at high speed.

 

Conveying medium

Slurry pump is mainly used in mining industry with strong wear resistance. So it transports slurry containing slag, but it can transport slurry. Mud pumps are usually made of cast iron and have low wear resistance. Therefore, mud pumps are often used to transport mud or mud containing suspended particles. When the slurry pump works, the pump components are vulnerable to impact, wear and corrosion. Therefore, the lining of the slurry pump adopts wear-resistant materials, such as high chromium alloy, rubber, etc. Wear resistant materials can effectively reduce the wear parts of the pump. Therefore, most of the slurry pumps on the market are wear-resistant slurry pumps.

 

auxiliary equipment

The mud pump needs to be equipped with auxiliary equipment, while the slurry pump does not. When the mud pump works, it often needs to be used with the high-pressure water pump. The high-pressure pump sends water greater than the mud pump pressure to the leak proof packing. Then protect the packaging. Otherwise, it is easy to wear the seal. The wear-resistant slurry pump can complete the conveying work independently without other auxiliary equipment.

In short, the slurry pump has stronger wear resistance and stronger ability to transport particles. Generally, the capacity of slurry pump is larger than that of slurry pump, which is mainly used for the washing of coal and metal ore. Mud pump is more suitable for mud with low abrasiveness.

 

Similarities between slurry pump and mud pump

1. Both pumps are centrifugal pumps in working principle. They are machines that increase the energy of solid and liquid mixtures through centrifugal force (rotation of pump impeller). The utility model relates to a device for converting electric energy into medium kinetic energy and potential energy.

2. Both have vertical pumps and horizontal pumps, which can transport mud.

3. The pump and motor are set separately

 

Fengwang has a considerable selection of slurry pumps and also Mud Pump.If you want more professional knowledge, please click here to visit our website.

 

Important things to know before using slurry pump

Slurry is a special compound in many processing industries, including food, dairy products, beverage processing, biopharmaceutical manufacturing and other health industries. Mud combines the properties of liquid and solid, so when it comes to determining the type and size of mud, special consideration must be given to pumps and their use.

All slurries have five basic characteristics:

More abrasive than pure liquids.

Consistency is thicker than pure liquid.

It may contain a large amount of solids (measured as a percentage of total volume).

Solid particles usually precipitate out of the slurry sediment relatively quickly when not moving (depending on the particle size).

Mud requires more energy to move than pure liquid.

According to the corrosivity of mud, the industry further divides mud into four categories - Category 1 has the least corrosivity and category 4 has the strongest corrosivity. Pumping mud will have the following wear effects on pump and pipeline components:

Wear: including air gouging, high stress grinding and low stress grinding (only applicable to settling slurry).

Erosion: the loss of surface material caused by the action of particles in the pumped mud. Erosion is mainly found when pumping settling mud.

Corrosion: caused by the action of current in the pumped fluid. Some types of slurries (e.g., strongly acidic or alkaline compounds) have a greater impact on component corrosion than milder slurries.

As described below, there are several types of pumps suitable for pumping mud. However, before considering which technology to use, we must address several key considerations.

Size and properties of solids in liquid: size and properties will affect the physical wear of the pump and its components, and whether solids will pass through the pump without damage.

One problem with centrifugal pumps is that the speed and shear forces in the pump may damage the mud / solids. Generally speaking, the twin-screw pump has the least damage to the solids in the slurry.

Corrosivity of liquid or slurry mixture: corrosive slurry will wear pump components faster and may determine the material selection of the pump.

Selecting the right pump for your slurry application can be a complex task due to the balance of flow, pressure, viscosity, abrasiveness, particle size and particle type. ZGB series slurry pump: modern CAD design, excellent hydraulic performance, high efficiency, low wear rate, large flow rate, multi-span, multi-stage series, mainly used for power, metallurgy, mining conveying corrosive slurry, Especially used in power plant ash.

How to maintain slurry pump？

Like many other machines, slurry pumps require regular maintenance to operate optimally and reliably. Without proper maintenance, the pump may fail catastrophically, resulting in unplanned maintenance, potential injury and facility shutdown. Even if they do not fail, poorly maintained pumps may lose a full 15% efficiency, causing pump owners to pay a price, reduce output and damage their bottom line. Moreover, although the pump owner and operator can perform some maintenance by themselves, in some cases, professional personnel need to be called. Don't wait for problems with your pump: customize this slurry pump maintenance guide to meet your business needs, and then follow it to keep your pump in optimal operation.

 

Daily maintenance

Although this maintenance list may seem long at first glance, its various projects can often be completed quickly and easily. Although they seem insignificant, these daily steps are the key to maintaining pump efficiency.

Checklist.jpg check the oil, but only when the pump is not running.

If the temperature suddenly increases or decreases, check the bearing.

Check the stuffing box and adjust as necessary.

Monitor all instruments and instruments consistently.

Look for leaks. If the drain hole of the pump casing leaks, replace the lining.

Follow up gland service pressure as changes may indicate further problems. Blocked pipes or poorly functioning stuffing boxes may change the gland working pressure.

Check the V-belt drive, especially those installed in recent days. The new V-belt will stretch and needs to be re-tensioned as soon as possible.

 

Weekly maintenance

Don't forget weekly maintenance! Although these two tasks will increase your weekly routine maintenance needs, they are essential to track and ensure pump efficiency.

Readjust the impeller as required.

Record the meter reading.

 

Quarterly maintenance

Quarterly tasks involve more practical work and may require the attention of skilled on-the-job mechanics, but they may mean the difference between a well functioning pump and a catastrophic failure.

Empty the used lubricating oil and replace it with a new one.

Check the V-belt for signs of wear and ensure proper tension. Clean the V-belt and pulley groove.

Clean and oil the studs and threads on the motor base and gland.

Check the stuffing box for wear and repack.

Semiannual maintenance

Last but not least, semi annual maintenance tasks are important because they do not check the pump components, but the whole pump.

Check the whole pump thoroughly.

Clean the bearing and bearing housing and refill with new oil.

Check and flush drain and seal water pipes.

Check that the pump and motor are aligned.

Accurate and up-to-date records must be maintained using a consistent method at all maintenance stages. If more than one employee in your factory records instrument and meter readings, make sure they follow the same procedure every time, so that they can read and compare the records. Of course, if you find any change in the sound of the pump, please check the pump as soon as possible. By performing these tasks several additional times a day, week, and year, you can keep your pump running at its best - rather than dealing with poorly maintained pumps that cause problems or stop completely.

Application of slurry pump in Coal Preparation Plant

Slurry pumps are widely used in the transportation of slurry water, circulating water, coal slurry and heavy medium suspension. As an important auxiliary equipment in the process of coal preparation plant, the operation of slurry pump directly affects the normal operation of production system. There are two kinds of slurry pumps commonly used in coal washing plant: Horizontal single-stage centrifugal pump and vertical single-stage pump.

1. Slurry pump: pump the medium suspension in the hopper (according to the specified density) into the shallow tank heavy medium separation tank for the separation of raw coal.

2. Gravel pump: pump the dilute medium suspension in the dilute medium barrel into the magnetic separator for magnetic separation, and recover the concentrate (medium) after magnetic separation to the combined medium barrel.

3. Vortex pump: pump the slime in the slime bucket into the cyclone separator of the slime thickener for separation.

4. Horizontal pump: send the underground water pump to the thin medium barrel.

5. Water pump: the clear water clarified in the concentrator is pumped into the water washing system to spray water to remove medium and screen, and make up water for the system.

6. Underflow pump: concentrate the high concentration coal slurry water in the tank and pump it into the water washing system of coal slurry mixing drum.

7. Vertical slurry pump: pump high concentration coal slurry into the filter press to realize the separation of coal slurry and water.

8. Filtrate pump: the filtrate treated by the filter press circulates into the filtrate drum and is pumped to the concentration tank by the filtrate pump.

Generally, medium-sized coal preparation plants will be equipped with dozens or even hundreds of slurry pumps to form a complete coal washing process.

 

Fengwang manufactures the best slurry pumps and sludge pumps in a variety of industries for various markets and applications. With the latest modern technology of slurry pump, Fengwang slurry pump option can provide various types, sizes, speeds, metal and solid handling capacity. Our slurry pump option relocates a large number of liquids with retained solid mixtures and non suspended solids. We provide high-quality commercial slurry pumps for mining, agriculture, food treatment, waste treatment and other industries.

 

Fengwang has quite a number of slurry pumps and sludge pumps to choose from. We offer various types of centrifugal pumps and positive displacement pumps. Our sludge and mud pumps have great advantages over other pumps due to their challenging layout, simple maintenance and excellent efficiency in harsh applications. Therefore, Fengwang slurry pump can be used in a wide range of mining, dredging, mineral treatment, ash pumping, wastewater treatment, food processing, chemical industry, oil and gas refining and various other applications. Our pumps ensure the integrity required for these applications.

What Benefits Do We Get From Coal Washing Machines?

 

What is coal cleaning?

Relying on its high quality, coal needs to be "cleaned" with water and also chemicals to remove sulfur and also contaminations prior to it can be melted in a power plant. Coal washing, or coal beneficiation, is widely seen as an efficient method for obtaining one of the most from run-of-mine coal. On the other hand, it is a water-intensive process: generally, washing one ton of coal consumes regarding 45 m3 liters of water. As environmental policies tighten up, mechanical mining raises pollutants in run-of-mine coal, and manufacturing rates continue to rise, there is a constant demand for improving coal top quality.

Why do you need a coal washing machine?

Today, coal provides a 3rd of all power made use of worldwide as well as composes 38% of electricity generation. Additionally, sectors such as iron & steel, cement, fertilizers, and also pulp & paper rely upon coal for their procedures as well as power needs. Given the position of coal in the worldwide power structure and the reputable ecological problems related to it, the production of clean coal technologies is vital to complete both efficient energy production as well as a reduced ecological footprint. This is where coal cleaning is available in.

Benefits of coal washing

1. The process of coal washing decreases carbon dioxide and also transforms them into a rich supply of residential power. This will certainly not only reduce the harmful emissions from burning coal but also convert it right into a rich supply of power.
2. Cheaper and far better alternative to natural gas and various other sorts of fuels as it is so affordable to establish a brand-new coal plant altogether. Coal is a more affordable and more generously discovered fossil fuel when contrasted to others. It is elder than other types of eco-friendly power plants, which allows making use of clean coal for residential objectives.
3. Clean coal can also be achieved by an approach of filtering. In this process, filters are installed on exhausts to catch the greenhouse gases when coal is melted. The gaseous discharges from melted coal are saved underground.

 

Coal Washing Process

Coal washing is completed by a couple of significant procedures, thickness splitting up or froth flotation. Both processes depend upon the reality that the particles of which a coal sample is made have different thickness. When water is added to the example, fragments sink to various depths relying on their densities. The numerous components of the example can be divided from each various other. A number of tools and systems have been created for extracting the numerous elements of coal once they have actually been divided with water therapy. Among these gadgets is the jig. In a jig, the column of water is maintained in a continuous up-and-down movement through a flow of air. Tidy coal fragments are carried to the top of the jig by this movement, while heavier refuse fragments sink to the bottom.

We are a coal cleaning machines supplier, please do not hesitate to contact us if you require them.