An alternative concentrated acid filter
Thread Content
The dilute acid filters and concentrated acid filters currently used in the industry are both open-pore filters. Non-metals can be used for dilute acids, while metal materials corrode faster for concentrated acids. The reason is nothing more than that the metal filter screen has many openings, forming sharp corners, and the corrosion area increases. For example, the butterfly-shaped bottom design of the dry suction tower of the sulfuric acid III system in our factory is equipped with a 316L stainless steel filter. After opening it for inspection less than half a year ago, not even the residue on the filter can be seen! In view of the above situation, Snapzhi proposed an almost alternative concentrated acid filter, which uses a 50mm porcelain ring as the filter medium. I don’t need to explain the specific design.
The filter medium is a 50mm porcelain ring, which is very creative and the effect should be very good!
Thank you for such good information. Thank you.
It was indeed a good idea. During the 400,000-ton test run, porcelain fragments blocked the anti-eddy current device. As a result, circulating acid overflowed from the tower manhole, almost injuring the test crew.
I mentioned a while ago whether I could try to make a concentrated acid filter with anode protection. Please share your opinions.
Try to avoid using drilled filters and try a screen instead.
Ceramic filters can be customized. Our company can make this filter based on your company's data. Contact: Wang Banghui. Mobile: 13707991035
In addition, honeycomb ceramics should be better than 50mm porcelain rings. At least, the anti-eddy current device will not be blocked by porcelain fragments, resulting in circulating acid overflowing from the tower manhole."
There is no problem with ceramics' resistance to concentrated acid corrosion. The key is strength and thermal shock resistance.
Microporous ceramic filter element parameters: 1. High temperature resistance. PT963 ceramic membrane filter tube is calcined at high temperature and can withstand temperatures of >700°C. 2.Excellent thermal stability: 20°～300° (three times without cracking). 3. Compressive strength: ≥10.8Mpa 4. The flow rate can be determined according to the medium parameters. The minimum pore diameter can be 0.5 microns.
It is recommended to post a special post on ceramic filter plates in this section.
It's a good idea, but I wonder if there will be much resistance?
The resistance depends on the size of the impurities in the medium. The maximum resistance is 0.5 kg and the minimum is 0.08 kg.
Reply to the moderator because our company has no performance in this area so far, so it is difficult to post. A few days ago, our company did an experiment of filtering 500 tons of waste concentrated sulfuric acid per hour in a sulfuric acid plant in Sichuan. The effect was very good, but we have not yet placed an order. If any company needs to solve this problem, you can upload the relevant data and we can make a plan. I'm not very familiar with the sulfuric acid industry. I don't know what kind of impurities need to be filtered, how big the impurities are, and how much the amount is in one hour. For small amounts, you can use filter plates, and for large amounts, you can use filter tubes. The filter plates are not impact-resistant. So I dare not make random posts, but there is absolutely no problem with using ceramic filters to remove impurities in sulfuric acid.
You can consider installing a ceramic cylindrical filter at the acid outlet at the butterfly bottom of the dry suction tower, and plan to order one for trial before the overhaul in 2008.
Why is there no content about such a good thing?
Our factory has encountered a similar situation. I also want to order one. Who can do it?
Our factory uses a 316L stainless steel filter cartridge. I make an orifice plate and roll it into a tube, and weld a cap on it to become the filter cartridge.
When the new system was started, a 316L stainless steel braided filter was installed on the pipeline in front of Yangbao. The effect was very good and no corrosion was found.
If you use a magnetic ring as a filter, how big should it be? It can be used under pressure, but I'm afraid it won't work if it is placed at the bottom of the tower by gravity. If the acid does not return quickly enough, it will become liquid-sealed. Nowadays, the filters made of high-silicon stainless steel have a very long service life. You can try changing the materials.