What Is a Filter Press?

The filter press is one of the oldest and most trusted dewatering equipment. It is used for wastewater treatment in various industries and applications. The working principle of the filter press is to separate out solids from liquids and remove impurities and suspended solids in industrial wastewater. This allows plant managers to easily dispose of garbage while sending clean water back to their system.

Filter presses separates liquid and solid. Specifically, the filter press separates liquid and solid through pressure filtration of a filter medium. The slurry is then pumped into the filter press and then dehydrated under pressure.

What is a filter press?

Filter press is a device used for liquid-solid separation. Specifically, filter presses use pressure filtration to separate liquids and solids, where the slurry is pumped into the filter press and dehydrated under pressure. Basically, each filter press is designed according to the volume and type of mud to be dewatered.

Filter press history

The filter press originated in England in the middle of the 19th century, when the embryonic form of the press was used to extract vegetable oil from seeds. However, it was not until the mid-20th century that engineers were able to develop the world's first automatic horizontal filter press.

It is this long historical advancement that enables filter presses today to achieve significantly lower energy and maintenance costs compared to their belt press and centrifuge counterparts. In fact, the total operating filtration cost of a filter press can easily be 1/6 of the cost of what it would be for a belt press or centrifuge.

filter press

Although there are many different styles of modern filter presses, plate and frame filter presses are the oldest and most tested type of dewatering equipment available. Filter presses are particularly useful because the remaining solids are cheaper and easier to move than the entire slurry. With the clean water that filter presses return, factory managers can discharge it to local municipalities, watersheds, or use it in their own closed-loop system, creating highly efficient process.

How does the filter press work?

The working principle of the filter press is to pump the slurry into the machine to make the solids evenly distributed in the filling cycle. The solids build up on the filter cloth to form a filter cake; the filtrate exits the filter plate through the corner holes and enters the manifold to produce clean filtered water.

The filter press is a pressure filtration method, so when the filter press feed pump generates pressure, solids will form in the chamber until they are completely filled with solids to form a filter cake. Once the chamber is full, the cycle is complete and the filter cake is ready to be released. In many high-capacity filter presses, fast-action automatic plate shifter is employed, speeding up the cycle time.

We are filter press suppliers. Please feel free to contact us if you are interested in our products.

A Beginner’s Guide To Pumping Slurry

If you have ever pumped slurry, you know it is one of the most challenging fluids to move. It is abrasive, viscous, sometimes corrosive, and contains a lot of solids. There is no doubt that the slurry is very difficult for the pump. But the more you know about what you are pumping, the better your pumpselection becomes, setting a you up for longer mean time between failure.

What is "slurry"?

Slurry is any mixture of fluid (such as water) and powdered solids. In mining, steel processing, foundries, and power generation, slurry is used as a convenient method of handling bulk solids. Slurry usually flows under gravity, like a viscous fluid, but it can also be pumped in as needed.

Slurry pump

Slurry is generally divided into two categories: non-settling or settling. The non-settling slurry is composed of very fine particles, giving the illusion of an increase in apparent viscosity. These slurries usually have lower wear properties, but they do require very careful consideration when choosing the right pump, because their properties are different from ordinary liquids.

Settling slurry is formed by coarse particles, which tend to form unstable mixtures. When choosing a pump, special attention should be paid to the calculation of flow and power. Most slurry applications consist of coarse particles and therefore have high wear properties.

The following are the common characteristics of slurry:

Abrasive

Thick consistency

Does it contain a lot of solids

Usually resolved quickly

Need more power than "water pump" to run

Slurry pump selection

Choosing the right pump for the slurry is the key to maximum benefit. The basic components of the pump, such as the size and design of the impeller, structural materials and discharge structure, must be considered to ensure that the pump can resist the wear caused by the abrasive slurry. Compared with low-viscosity liquid pumps, slurry pumps are generally larger in size and usually require more horsepower to operate because of their lower efficiency. Bearings and shafts must also be stronger and more rigid.

Slurry pump considerations

If you have experience in pumping slurry, you know that this is not an easy job. The slurry is heavy and difficult to pump. They can cause excessive wear of the pump and its components, and if the movement speed is not fast enough, they can block the suction and discharge pipes. Most importantly, it is a challenge to make the slurry pump last for a reasonable time. However, there are things you can do to extend the life of your slurry pump and make pumping slurry less challenging.

Find the best operating point to make the pump run as slow as possible (to reduce wear), but fast enough to prevent solids from settling and clogging the lines

In order to reduce wear, the exhaust pressure of the pump should be reduced as much as possible to the lowest

Follow proper piping principles to ensure that the slurry is delivered to the pump consistently and evenly

Pumping slurry brings some challenges and problems, but with the right engineering and equipment selection, you can experience years of worry-free operation. When choosing a slurry pump, it is important to work with a qualified engineer, because if not selected correctly, the slurry may cause serious damage to the pump.

We are slurry pump suppliers. Please feel free to contact us if you are interested in our products.

Benefits Of Vibrating Screens

Vibrating screen is one of the main types of industrial screening equipment. There are several mechanical screening solutions in the solid waste management, recycling, and polymerization industries; however, vibrating screens provide many unique advantages that make them the first choice for various industrial applications.

Read on to learn more about how vibrating screens work and their benefits over other common types of screening equipment.

What is a vibrating screen?

As the name implies, the design of the vibrating screen is based on the principle of transmitting vibration to the screening surface in order to separate and classify different particles according to their size.

Regardless of the design of the machine, the principle is the same: vibration breaks the surface tension between particles, thereby forcing them to separate. Particles that are too small, so-called "fines", pass through the screen. At the same time, oversized particles are carried through the screen surface. This is an important application in many industries, especially mineral processing.

Due to its unique design features, the vibrating screen has special advantages over other material processing equipment, including:

Improve processing and material quality

Low operating cost

Reduce maintenance and downtime

High screening efficiency

Vibrating screen

We will explain these benefits in further detail below.

Improve processing and material quality

Although certain screening equipment is more suitable for different materials, vibrating screens have many advantages in the processing of aggregates and mining materials. The equipment of the vibrating screen is particularly sophisticated to meet the fineness requirements of these industries. Their design can generate the force required to separate large particles from fines, thereby making the product easier to recycle—even when processing materials that require significantly smaller particle size separation. This leads to higher yields and an improvement in the overall quality of the final product.

Low operating cost

The vibrating screen is famous for its sturdy design. Because the working principle is relatively simple, and the design of modern machines is streamlined, vibrating screens are generally bought less than other types of screens. This resulted in lower upfront investment.

In addition, compared with more complex machinery, the vibrating screen can run with lower energy consumption, thereby saving the company's continuous operating costs. Finally, because the high-frequency vibration is directly transmitted to the screen surface, only the media on the screen surface needs to be replaced regularly. This can help save the maintenance and repair costs that other screening equipment often constitutes.

Reduce maintenance and downtime

Maintenance and downtime caused by repairs or equipment failures can result in significant losses in productivity and profits. Many types of screens have experienced severe wear, especially in demanding applications such as aggregate processing. However, the vibrating screen offers the advantage of less maintenance and downtime. This is the result of their design, the center of which is to only transmit the exciting force to the screening surface.

In addition, high-quality vibrating screening equipment is designed and manufactured to minimize the impact of other parts of the machine by the exciting force. In more complex designs, the structure of the machine allows sufficient absorption and suppression of vibrations other than the screen media. This results in fewer moving parts and less wear, further reducing downtime and maintenance.

High screening efficiency

Although there are various screening equipment on the market, when a simple solution is needed that can handle higher feed flow rates, vibrating screens provide an ideal choice. In fact, the vibrating screen has the highest working efficiency and the flow rate is always higher. For other types of screening equipment, the same material throughput may result in blind screening or material backflow, requiring a slower feed.

We are vibrating screen suppliers. Please feel free to contact us if you are interested in our products.

How To Choose The Right Pump For Coal Washer?

The main reasons for coal washing are to reduce the transportation cost, reduce the ash content to improve the efficiency of power plant and reduce the generation of harmful gases to protect the environment. In addition, a large number of power plant ash has caused a major disposal problem, which can be better replaced by landfill excavation area, in the mine cleaning and disposal of washing waste.

1>What is coal washing?

Coal from mines is a complex mixture of materials with various physical properties. In addition to the coal itself, the mixture contains rocks, sand and various minerals. Therefore, coal must be cleaned before it is sold to consumers. Coal washing is accomplished through one of two main processes, namely density separation or froth flotation. Both processes depend on the fact that the particles from which the coal samples are made have different densities. 

2>The crushing operations in the coal preparation plant mainly have the following requirements:

1) Adapt to the requirements of the selected particles; the coal particles that can be processed by the selected machinery have a certain range, and the large pieces exceeding this range must be crushed before being washed; 2) Some coals are quickly caught by coal and vermiculite. Yancoal, in order to select clean coal from it, needs to be broken into smaller particles to separate coal from tantalum coal; 3) to meet the user’s particle requirements and to quickly crush the selected product or coal to certain particle size. The material is crushed mainly by mechanical methods, and there are several main methods such as crushing, chopping, breaking, crushing and grinding.

3>Choose the right pump for coal washing plant

In the process of mining coal, up to 50% of the extracted material may be waste. This stone material must be removed from the coal before processing. Coal processing plants clean coal while crushing and grading coal. An important factor in the operation of a coal processing plant is to provide water for the coal preparation plant and then remove the abrasive waste water. The resulting waste water is still muddy and abrasive mud, full of pulverized coal, coal balls and dirt. This waste water needs a mud pump to move it.

It is very important to use the professional mud pump, because the mud has strong abrasiveness, which will soon wear the ordinary pump. The mud pump has a replaceable lining, all wear parts are made of wear-resistant materials, usually rubber or high chromium, but elastomers, stainless steel and ceramics can also be used. Mud pumps have wider tolerances to allow solids to pass through, which makes them less efficient, but more durable than pumps, and their casings and bearings are stronger, so these pumps are larger and heavier, requiring more horsepower to operate.

The centrifugal horizontal slurry pump is the most common type, while the shaft of the vertical slurry pump is located in the water, which is usually used to pump water out of the sump. For low flow applications, cam pumps or peristaltic pumps can be used to deliver mud. Care must be taken when choosing more efficient pumps; Sometimes the effect of wear can quickly weaken this efficiency, resulting in a higher life cost than a pump with a lower apparent efficiency.

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.

ZJ series slagging pump: is a new generation of high-efficiency single-stage, single-suction, centrifugal slagging pump with corrosive slurry containing solid particles.Overall performance of the domestic leading level, with good wear resistance, corrosion resistance.

AH series slurry pump is horizontal, vertical open type, double pump shell structure. Wide performance, good cavitation, long service life, high operating efficiency, mainly suitable for conveying strong corrosion, high concentration of slag slurry or low density, low corrosion of high lift slurry. 

The basic factors to be considered when selecting a pump include: What is the required head and velocity? How far does the water need to be pumped? What kind of dirty water is actually pumped - turbid or containing heavy solids? Friction loss due to piping configuration should also be considered.

Fengwang supplies portable slurry pump series products, and has a professional technical service team with coal preparation equipment. With many years of operating experience, we are familiar with the international market. Welcome to contact us.

Main Purpose Of Coal Preparation

Coal preparation includes coal blending, homogenization, size reduction, grinding, screening and processing. The most important step is coal preparation or cleaning. The cost of coal preparation depends on the method used and the degree of beneficiation required, which largely depends on the market demand for the product. Almost all coal used for electric power generation and industrial boilers is ground or crushed and sized before combustion. The presence of incombustible substances or ash increases the net heat content, but it reduces dust, ash, transportation and shipping costs. The ash content will also increase the wear of coal grinding equipment and boilers.

Therefore, coal can be cleaned to varying degrees, and according to its type, its utilization takes into account the cleaning cost. Extremely dirty coal containing a large amount of foreign minerals must undergo extensive cleaning to meet market specifications. The final selling price of these coals is determined by the cost of the cleaning step.

Washing or cleaning of coal

Washing of coal is the most important step in the coal preparation process. Raw coal must undergo selective qualitative and quantitative analysis to find the most suitable coal cleaning operating conditions to obtain the required quality. Among these analyses, the washability test is the most important.

The main purpose of coal preparation is:

(1) Remove impurities in raw coal, reduce ash and sulfur content, improve coal quality, and meet the needs of users.

(2) Divide coal into products of different quality and specifications to meet the needs of users in order to effectively and rationally use coal and save coal.

(3) After coal is washed, the gangue can be discarded on the spot, which can reduce ineffective transportation and create conditions for the comprehensive utilization of coal gangue.

(4) Coal washing can remove most of the ash and 50% to 70% of pyrite sulfur, reducing the pollution of the atmosphere from coal burning. It is the premise of clean coal technology.

How is coal washed?

There are two main methods for washing coal, one is density separation, and the other is froth flotation. Both processes depend on the fact that the particles from which the coal sample is made have different densities. For example, when water is added to the sample, the particles will sink to different depths according to their density. In this way, the various components of the sample can be separated from each other.

Fengwang provides coal washing machine, which is a air chamber jig under sieve, used for the separation of lump coal or unsorted raw coal. In view of the status of coal in the global energy framework and the reasonable environmental concerns associated with it, the technology to produce clean coal is essential to achieve efficient energy production and reduce environmental footprint.

How Does The Coal Washing Equipment Wash Coal?

Coal washing equipment is the general name of a set of mechanical assembly; a general discussion is a set of coal washing equipment composed of jigs, flotation machines, coal feeders, thickening tanks, crushers and other mechanical equipment. It has high-quality features such as high efficiency, high precision and high environmental protection.

How does the coal washing equipment wash coal? It is mainly through a series of small machinery such as a grading screen to separate the raw coal particles with different sizes, and then the large coal pieces are crushed by the crusher; the material crushing mainly uses mechanical methods, including crushing, splitting, breaking, crushing, grinding and so on. The main method is to use different physics from other substances.

Physical-chemical properties. In the coal preparation plant, the impurities mixed in the raw coal are removed by mechanical methods, and they are divided into products of different quality and specifications to meet the needs of different households. Some coal or gangue in the raw coal is sorted out and processed into bituminous coal and anthracite coal blocks burned in our homes. The powdered coal can be processed into coal slime or briquettes.

We are coal washing equipment suppliers. Please feel free to contact us if you are interested in our products.

Do You Know Coal Washer?

Depending on the quality of coal, coal needs to be "washed" with water and chemicals to remove sulfur and impurities before it is burned by power plants. It is generally believed that coal washing or coal preparation is an effective way to get the most benefit from coal that has never been mined. On the other hand, this is a water-consuming process: usually, it takes 45 cubic meters of water to wash one ton of coal. With the tightening of environmental protection laws and regulations, mechanized mining has increased the impurities in raw coal, the output has continued to soar, and the demand for improving the quality of coal has continued to increase.

Coal from coal mine is a complex material mixture with multiple physical properties. In addition to coal itself, this mixture also contains rocks, sand and various minerals. Therefore, coal must be purified before being sold to consumers. The cleaning process includes a series of steps, and finally produces products that are particularly suitable for specific consumer needs. The earliest of these steps is crushing and sorting. These two processes can reduce coal to a form that consumers need.

The coal washing plant has improved the coal washing process and the quality of coal washing, thereby increasing the price. Coal washing technology also helps reduce emissions from combustion.

Coal from the mine is a combination of a complex material and a large number of physical homes. In addition to coal itself, rocks, sand and different minerals are also included in the mixture. Therefore, coal needs to be cleaned before it can be provided to consumers. The cleaning program contains many steps that result in products that are particularly suitable for specific customer requirements. Among the earliest of these steps is crushing and also sizing, these two processes can reduce coal to the form required by customers.

Purpose of coal washing equipment:

1. Reduce water and energy-intensive coal production

The coal washing program includes factory installation and independent modules to optimize beneficiation capacity. In other words, this means maximizing ore recovery rates while using less water, energy or other consumables in the process.

Another important feature is water conservation. By enhancing water saving, zero discharge of wastewater and reducing carbon emissions, this solution helps to achieve a more sustainable process.

2. A more sustainable process helps reduce operating costs

To meet the needs of customers for greater flexibility and efficiency in sustainability. Our philosophy is to provide comprehensive solutions for the industry.

Structural characteristics of coal washer:

1. Standard length valve body can be used, and the combination shape can be selected according to the needs.

2. Coal washing technology-the use of CNC pneumatic valve, the coal washing has a high degree of automation.

3. Coal preparation method: double-amplitude pulse water flow, good bed stratification effect, and high clean coal output.