Solid-liquid separation problem
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For solid particles that are extremely small and suspended in a liquid (alumina powder: highly refined and very fine; centrifugal filtration is currently used, but the process is still slow and it isn’t possible to separate them completely as the solids are viscous), what are some better methods that could be used for separation?
I am not very familiar with your company’s production processes, but starting from a simple approach, a filtration method could be used. :) If it’s bag-type, core filtration should work. The filtration diameter that can be achieved nowadays is on the order of micrometers.
Switch to a filter press; for the separation of solids and liquids where the crystals are fine, the performance of a filter press is better than that of a centrifuge.
Try using leaching; that’s a good idea
Reply to 1# song8337455: It is recommended to refer to the opinion on floor 3. It is just for filtration, and a plate and frame filter press is suitable. Washing + filtration, suitable for diaphragm presses.
It depends on the specific process. If cost is not a major concern, bag filtration can be used. If cost is more of a concern, a combined filtration approach can be employed. There are tricks to knowing how to combine these methods, and this topic can be explored further.
I agree with the opinion from the third floor; our company uses plate and frame filter presses, and the filtering results are very good.
Reply to 7# kengogo: What is the level of mechanical automation in plate and frame filter presses? Does your company also filter out these sticky small particles?
Vertical automatic filter presses – fully automatic. We use LAROX from Finland; there are also domestic options as well. Yantai Ditananna’s products are good, and their prices are low, but they are much more expensive compared to centrifuges. However, the results are much better. Previously, we used centrifuges for dehydration, which resulted in low yields and high energy consumption; now things are much better, and washing can be carried out simultaneously.