Re: Wet Phospho Gypsum Extraction From Bin
Hello Kumar Rahul,
I have had experience with your problem many times. The application of vibration on hoppers silos etc,. is complex. many think that you just shake the vessel bottom and that is it. Vibrators can cause further compression of material when the discharge flow volume is not sufficient to evacuate the moving material. You may consider lining the sloped section with UHMW and then using Sword Nozzles. These nozzles are used with Air Cannons that blast compressed air into the vessel and distribute this force throughout the length of the nozzle. These nozzles should be interlocked with a mechanism that senses a flow / no flow situation so they are only used when needed. See attached image
Good Luck!
Lou Gutierrez
Clean Plant Engineering
(561) 713-6541
Attachments
swordJPEG:forum_attachments/file_container/sword.jpg (BMP)
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Re: Wet Phospho Gypsum Extraction From Bin
Always go for a correctly designed gravity flow bin then you don't need dischargers, vibrators, air cannon etc, etc. If you can't design one yourself, employ someone to do it for you as it will save a lot of hassle in the future.
Oh, and if they don't ask for a sample of material to test, choose someone else! ■
Re: Wet Phospho Gypsum Extraction From Bin
The big problem I find with moist samples is that they loose moisture fast and have to be tested immediately as wall and internal friction vary with moisture level.
I do agree with Designer, use of brute force for discharging hoppers is not recommended a properly designed hopper should discharge without belt and brasses using air cannon. ■
Pospho-Gypsom
A conical bin with 70 Deg Slope with 1.2 m dia bottom, a table feeder of 3 m dia for extraction will solve the problem. You do not need a rod gate under the bin. It can be a steel bin. The table feeder with variable speed motor with load cell on extraction belt will regulate the extraction rate. ■
Re: Wet Phospho Gypsum Extraction From Bin
Another “Horses for Courses” solution ! ■
Bin Design
Re: Wet Phospho Gypsum Extraction From Bin
Excellent chart!
It's worthy of being put in a "sticky" at the top of this forum. ■
Wet Phospho gypsum extraction from bin
At one of our plants, we have phospho-gypsum (PG) processing plant. We are facing problem with extraction of wet phosphogypsum from bin. Can you help with some idea.
Material circuit and the problem:
There is a dump hopper, below which there is a rod gate. Then the material goes to a belt conveyor, which feeds the PG to bin. The PG has 15-20% free moisture. Below the bin there a weigh feeder with in-feed bin. In the plant, they face jamming of the bin bottom portion and chute. Vibratory motor is installed in both the main bin and the in-feed bin of WF. Also, it has been observed that because of the vibration by motor, the material gets further compact. One person has to remain at the site all the time, doing poking.
Now, we are installing another plant of similar arrangement. We don’t want to repeat the jamming problem there.
Technical data:
Material handled: Wet Phosphogypsum (chemical gypsum)
Moisture: 15-20%
Particle size: 7.8%: +210 micr, 78%: +45 micr
Bulk density: 0.9 tons/m3 for volume, and 1.2 tons/m3 for power
Temp: ambient
Weigh feeder TPH: 40 TPH
Belt width: 800
Bin discharge opening: 1000X1000 mm
Queries:
Now, as we are installing another plant of similar arrangement. We don’t want to repeat the jamming problem there. What should we do to avoid this problem?
1.We want the rod gate to isolate the bin in the new plant. But the running plant doesn’t have one. Will not having the rod gate help in extraction?
2.Is there any other equipment possible to extract material from the bin?
3.Can we think of any other arrangement like agitator, which can positively extract the material?
4.Can you suggest any supplier, in case you have some strong suggestion about the system we should go for.
Please reply.
Kumar Rahul
Assistant Manager
Email: nitdurgapur @ gmail.com ■