Selection of solid-liquid transfer pumps
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There is a crystallization system that requires transferring the slurry in the crystallizer to downstream equipment for solid-liquid separation; pusher centrifuges or scraper centrifuges have been initially selected as the equipment for this purpose. The solid particles in the slurry have a particle size of 0.2–1.0 mm and possess a certain degree of hardness; the viscosity of the liquid phase is low, similar to that of water. The solid concentration is 30%–40%, and the density difference between the solid and liquid phases is approximately 10%–20%. The liquid phase can dissolve rubber, which is why pumps with rubber linings cannot be used. We have tried pumps that meet the requirements; these include screw pumps, diaphragm pumps, centrifugal pumps, rotor pumps, open-type pumps, and semi-open pumps. We have contacted several pump manufacturers, but none of them met our expectations. Which student has experience in transporting similar materials? Please offer some advice. If a pump is not used, other conveying methods can also be employed, but gas delivery is not desired; it must be suitable for continuous large-scale production.
I personally also think that slurry pumps can be used; if the liquid phase is corrosive, simply choose a suitable material
A reciprocating piston pump should work as well.
Imported pneumatic diaphragm pumps are used. It can handle particles with a diameter of up to 9.6 mm; positive displacement pumps have no shear force, so they do not damage the structure of your particles, and they offer good wear resistance. Go and take a look at the slurry transfer pumps used in the ceramics industry – these pumps are used everywhere these days, and the operating conditions for them are even more stringent than those specified for your pump. There are also domestic versions of this pump; I’ve seen friends use them. They can handle water-based media, but they’re not suitable for applications that require high wear resistance.
It can be solved using a screw conveyor.
The mud pump used for drilling should be fine.
Diaphragm pumps have been used; both pneumatic and electric types have been tried. They are capable of transporting fluid, but the solid concentration can only reach around 15% – any higher and it won’t work. The diaphragms also tend to break after about a week. The nature of my material is similar to insoluble salts in water, and it is different from cement, coal slurry, etc. I also checked the slurry pump; the flow rate is too high – my setup isn’t big enough for that. Clog-free pumps were also considered; some manufacturers said they wouldn’t work while others claimed they would. It was the same with rotor pumps back then – some said they would function and others said they wouldn’t, and even after purchasing them and giving them a try, they still didn’t work. Now I’m too hesitant to take any risks.
I agree with the poster’s points regarding the several disadvantages of diaphragm pumps; indeed, when transporting materials containing solid particles, the diaphragm tends to break, requiring replacement within less than a week. When a slurry pump transports a small flow rate, its efficiency is low and the cost is high. What about using a cam rotor pump? The original poster said they have used it as well, but not very successfully. Could you tell me why? Is the wear quite severe, or is there some other condition? Also, the original poster could write down the flow rate and pressure. This post was last edited by lxn_663 on 2009-2-19 11:20.]
It’s better to use a screw pump; our factory uses them and the results are good