Horizontal centrifuge for crystal powder dehydration equipment

Description :

　　Horizontal centrifuge for crystal powder dehydration equipment

　　Overview:

　　1、 Solid liquid separation of crystalline powder

　　Crystals are very common in nature, and the well-known one is sodium chloride crystals, commonly known as salts. This article mainly discusses chemical crystals, such as. Dicyandiamide, commonly known as dicyandiamide, is a latent curing agent that has been widely used in coatings, single packaging adhesives, film adhesives, and other applications for a long time. Dicyandiamide is a white crystal with a melting point of 207-209 ℃. It has low toxicity but is difficult to dissolve in epoxy resin. It is reported that solvents can be used to dissolve in epoxy resin, but currently it is still mixed with epoxy resin after crushing, heated and mixed on a triple roller, or processed using an extruder.

　　2、 How to dehydrate crystalline powder?

　　Traditional dehydration equipment includes filter presses, centrifuges, etc. Due to the squeezing effect of filter presses, they can damage the crystal structure of crystalline powders, so they are excluded. And there are also three legged centrifuges, horizontal screw centrifuges, and even filtration centrifuges, so let's talk about them in this article.

　　3、 The difference between a three legged centrifuge and a decanter centrifuge:

　　When a three legged centrifuge filters suspensions containing very small particles, filter cloth is usually used as the filtering medium, and it is required that the filter cake does not move relative to the filter cloth. Obviously, a simple centrifuge that meets these requirements is a three legged centrifuge. It has a cylindrical drum with a vertical axis, a solid bottom, and a semi closed top. The rim at the top is called the drum edge, and the drum is supported on a tripod, hence the name tripod centrifuge. In general, there are many small holes drilled on the surface of the drum cover, and one or more layers of large hole metal filters are covered on the inside as support for the garment shaped filter cloth installed in the drum. Before or after starting, introduce the white top of the suspension into the drum, allowing the filtrate to flow out through the cover while the bulk particles are trapped on the filter cloth. In general, filter residue is manually removed or discharged by replacing the filter cloth bag after shutdown. A more advanced three legged centrifuge can be used by first reducing the speed of the drum to a few revolutions per minute, and then pushing a plow shaped blade into the filter residue to remove solid materials. The plow shaped knife flips the solid towards the axis of the drum, causing the filter residue to fall out from the bottom opening of the drum. With the help of a timer, all operations can be automatically performed.

　　Working principle of horizontal centrifuge for crystal powder dehydration equipment:

　　The drum and the screw rotate at a certain speed difference in the same direction and high speed. The material is continuously introduced into the inner cylinder of the conveying screw through the feeding pipe, accelerated and enters the drum. Under the action of the centrifugal force field, heavier solid substances deposit on the drum wall to form a sediment layer. The feeding spiral continuously pushes the deposited solid phase to the cone end of the drum and discharges it outside the machine through the slag discharge outlet. The lighter liquid phase forms an inner liquid ring, which continuously overflows from the large end overflow port of the drum and is discharged outside the machine through the discharge port. This machine can continuously feed, separate, wash, and discharge materials at full speed. It has the characteristics of compact structure, continuous operation, smooth operation, strong adaptability, high production capacity, and convenient maintenance. Suitable for separating suspensions containing solid particles with a particle size greater than 0.005mm and a concentration range of 2-40%.

　　The difference between the two lies in the processing capacity. The decanter centrifuge is a mechanical dewatering equipment with a processing capacity in the centrifuge category. The decanter centrifuge itself does not have a filter cloth and is easier to maintain. It has lower after-sales maintenance costs and a higher degree of automation than the three legged centrifuge.

　　Structural characteristics of horizontal centrifuge for crystal powder dewatering equipment;

　　1. High speed, high separation factor, large aspect ratio.

　　2. Single machine processing capability is large. The horizontal spiral discharge settling series centrifuges with diameters of 355, 400, 450, 500, 530, 580, 650, 760, and 900 (mm) are based on fluid theory and refer to foreign structural planning. They have large disposal capacity and good separation effect.

　　3. Low oscillation, low noise, and strong load-bearing capacity. The main bearings of this series of centrifuges are all imported bearings, which have high precision and strong load-bearing capacity. The precision of component manufacturing is high, and the whole machine is finely balanced by dual rotors to ensure stability and reliability during high-speed operation. The centrifuge has low oscillation, low noise, and all functions meet the requirements of national standards.

　　4. Equipped with multiple maintenance devices, it operates reliably. This series of centrifuges is usually equipped with differential overload maintenance or torque limiting couplings and other maintenance devices. According to the needs, safety maintenance devices such as oscillation maintenance, temperature monitoring and maintenance, and feed conditioning can also be equipped to maintain the entire machine through active alarm and forced shutdown.

　　5. The differential system can be reliable. The differential of this series of centrifuges usually uses planetary gears or cycloidal pinwheel differentials, and can also be equipped with a fully hydraulic differential system according to needs. Mechanical differentials are usually selected from well-known domestic brands, while hydraulic differential systems are selected from imported brands. The differential has high precision in manufacturing, good functionality, and reliable operation.

　　6. Key parts are corrosion-resistant and wear-resistant. The key parts such as the spiral feeding surface, the spiral body feeding and dispersing area, and the slag outlet of the rotary drum are usually sprayed or welded with a hard alloy wear-resistant layer. For special use centrifuges, embedded hard alloy wear-resistant blocks, wear-resistant sleeves, or wear-resistant ceramic plates are selected for anti-corrosion, wear-resistant, and long service life.

　　7. It has multiple driving and speed regulation methods. According to different needs, corresponding drive, differential speed, and speed regulation methods can be selected to facilitate the adjustment of drum speed and differential speed, in order to achieve the desired separation effect and adapt to various different separation situations.

　　8. Good sealing and explosion-proof function. There are specially planned and produced sealing and explosion-proof models for special separation occasions such as flammable and explosive situations for selection, and the sealing and explosion-proof functions are good, safe and reliable. The service life of mechanical seals is guaranteed to be 8000 hours, and the service life of airtight seals is guaranteed to be over 15000 hours.

　　9. Electrical control system, reliable. The electrical control system includes ordinary type, explosion-proof type, and microcomputer fully active control. CDS center control system can also be selected for long-distance monitoring and fully active operation according to needs. The electrical control system uses well-known domestic brands or imported components, with reliable functions.

　　10. Excellent material selection. The parts of this series of centrifuges that come into contact with materials are usually made of high-strength austenitic stainless steel or duplex stainless steel, and the components have satisfactory strength and excellent corrosion resistance.

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• Crystalline powder dehydration equipment