How to reduce the moisture content of solids using centrifuge filtration
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Use a centrifuge (three-legged type) to separate a liquid-solid mixture. The liquid-to-solid ratio is 3:1. The particle size of the solid is less than 1mm. Now the moisture content of the solid after centrifugation is too high (35%). I suspect there is something wrong with our operation. Is there too much material being discharged (discharging while turning)? How can we reduce the moisture content of the solid? I hope you experts can give me some advice! Or are there other types of centrifuges you can recommend?
1. The material should not be discharged too quickly. An optimal speed should be determined according to the conditions of the material liquid.； 2. The amount of material should not be discharged too much. An optimal amount of material should be determined according to the capacity of the centrifuge and the condition of the material liquid. ； 3. It is necessary to control the running time after adding the material, so that the material liquid can have a sufficient drying process. ； 4. Ask the manufacturer to provide after-sales service.
The speed of feeding should not affect the dehydration of the centrifuge. It may be related to the nature of your material. It is recommended to conduct the following experiment 1 to increase the dehydration time. (Generally 30 minutes depending on the nature of the material) 2. Increase the dehydration speed. 3. Change the filter cloth to increase the air permeability of the filter cloth. 4. Pay attention to the material of the filter cloth to see if it will be swollen by your solvent. If it is difficult to deliquify once it swells, change the filter cloth to another material. If the above still does not work, consider changing to a larger diameter centrifuge, or choose a centrifuge of other series.
It should be that the filter cloth was not selected properly.
1. Enlarge solid grains as much as possible； 2. To improve the air diameter of the filter cloth, we use 767 type 3. Extend the dumping time
Filter centrifuge mainly affects dehydration due to factors such as the speed of the drum, the diameter of the filter cloth and the filter cloth lining.
3# Eternal Moment Your analysis makes sense, but one thing I don’t think is feasible is to increase the diameter of the drum. In theory, it is possible, but in fact, as the diameter of the drum increases, it is affected by factors such as the strength of the drum material, so the rotation speed must be reduced. The separation factor is proportional to the diameter and proportional to the square of the rotational speed. Therefore, under the condition that the output is met, a small-diameter, high-speed, continuous centrifuge should be selected as much as possible.
Classmate downstairs, I would like to ask you whether the HR-400 or HR-630 two-stage piston pusher centrifuge feeds the same material at the same speed, which one has a lower moisture content? So don’t say it has nothing to do with the diameter. The larger the diameter, the greater the centrifugal force, the greater the relative output.
The rated speed of HR400 is higher than that of HR630. Why should it be adjusted to the same speed as HR630? Check the centrifuge manufacturer's website or do some calculations and you will know that the separation factor of HR400 is higher than that of HR630. Under the same material conditions, after separation by a centrifuge with a high separation factor, the moisture content of the solid will be lower. Of course, the output of HR630 is higher than that of HR400, but what we are discussing now is moisture content.