Questions regarding plate and frame filter presses?
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This post was last edited by sunjl1981 on 2013-1-6 at 23:08. In the chlor-alkali industry, filter presses are commonly used to handle salt sludge; our factory currently uses plate and frame filters made of polypropylene. When communicating with manufacturers, it was mentioned that there is a type of composite rubber sheet (also known as rubber-lined steel) whose performance is better than that of polypropylene. Are there any manufacturers who have used it and could share their experience? Such as the pressure of hydraulic systems, issues with saltwater leakage, and so on? Please recommend some other good filter press manufacturers. # + + .
This post was last edited and replied to by huawei on 2011-7-24 at 10:49. Reply 1# flay0303: Haha, actually, in saltwater and salt sludge treatment, composite rubber plate filter presses are those that are used most frequently. Polypropylene has lower pressure resistance than composite rubber sheets. There are two types: automatic plate pullers and manual plate pullers. If the scale is large and each filter press has a large number of plates, then an automatic plate puller is necessary; if labor costs are not high and the overall volume is small, a manual plate puller can be used. After all, the salt sludge treatment process is quite dirty and involves significant corrosion; automated mechanical systems are also prone to failure. The key factor lies in the level of management. As for whether to use hydraulic or mechanical clamps, it doesn’t matter; both are good. My suggestion is to use mechanical clamping for smaller units, and hydraulic clamping for larger ones. Several manufacturers in Jiangsu produce high-quality composite rubber plate filter presses; we use those from a factory in Guxi Town, Taizhou. I can’t remember its name right now, but it’s a company that does an excellent job in this field.
Reply to 2# huawei: At the moment, we use a hydraulic system combined with automatic plate pulling; it seems that the leakage issue with polypropylene isn’t being handled properly, and corrosion appears to be quite severe. The handles on the plate frames have broken several times. I’m wondering if composite rubber sheets would be better for preventing saltwater leakage. In my opinion, composite rubber would require much less hydraulic pressure to achieve a tight seal, and it should also offer better sealing performance. I’m not sure what the actual performance is in practice
Reply to 3# flay0303: The hanging ears of the composite rubber plate filter press are made of steel, which provides much higher strength; their use is recommended. As for sealing performance, from the perspective of rubber, it offers better sealing capabilities due to its high elasticity. However, sealing ultimately depends on how well the filter cloth fits together; if the filter cloth is flat, good sealing will be achieved. As a type of non-woven fabric, it can prevent salt sludge from passing through, but the fibers themselves still allow water to seep through, so a water collection tray is still necessary. The hydraulic pressure should be set according to the manufacturer’s instructions; it shouldn’t be too high, so as to prevent the pressing plate from deforming.
Reply to 4# huawei: The proportion of steel-lined diaphragm filters used in the chlor-alkali industry is quite high. The advantages are: strong sealing, good filtering performance, and importantly, durability. Although the initial investment is a bit high, over many years of use it becomes clear that the overall efficiency is higher than that of polypropylene plate filter presses. Our factory specializes in producing filter presses with steel linings; many customers come to us directly to make purchases
Reply to 5# SUDONGHUAJI: Everyone in the industry is aware of your factory; you don’t need to advertise here. It would be great if you could provide detailed information on the technical specifications to help clients make the right choice when selecting equipment. What I mentioned above also refers to your factory; I have been there before. It’s just that I’m hearing your name for the first time – are you new here?
We use filter presses with steel-lined rubber plates and mechanical pressing plates; the manufacturer is based in Jiangsu. The pressure of the sludge pumps is kept at around 0.5–0.6. The two older units have been in use for 7 years now, and their plates have aged, so we plan to replace them soon. On average, 1–2 filter pads are needed per unit per month for replacement.
Reply to 1# flay0303: Plate and frame filter presses with steel linings and rubber coatings are much more expensive than those made of polypropylene, but their performance is significantly better. Our company uses 5 such filter presses; the manufacturer is Jiangsu Sudong. I have been to their factory, and it has good scale efficiency and other advantages; the staff there are also very nice, and of course, their products are excellent.
A steel lining is better; we have both types. Polypropylene doesn’t provide good sealing, leading to severe leakage； Those with a steel lining also have slight leakage, but it’s much better.
Reply to 1# flay0303: Reinforced polypropylene is generally used for pressure filtration in solutions at higher temperatures; it has poorer elasticity and requires a higher compression pressure. Rubber-lined steel has good sealing properties, but it ages rapidly above 70 degrees Celsius; furthermore, it is not resistant to alkalis. Generally, chlor-alkali plants use rubber-lined steel plates.