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Screening Efficiency (7 replies)
One of the things that you can try to do is to increase the length of your screen by 30% of its current length size to aid in increasing your residence time, Ensure that your screen inclination angle is in the range of 5 to 10 degrees to have a reasonable bed height, also do try applying reverse elliptical movement on both of your screens. Ask your screen supplier if they can manage to sell or manipulate your current screens to that kind of movement. Good luck.
The screening efficiency is poor because of overloading of screen deck or higher moisture level. You may check the sieve analysis of feed and may redesign the upper deck screen aperture. If problem still there, on a trail run reduce the feed capacity and see the efficiency and if reuire may have to provide another parallel screen.
Whilst polymer panels are attractive in terms of not being subject to corrosion and being wear resistant they have a very poor open area compared to metal screens and the openings can flex decreasing the accuracy of the screen. Try a metal screen, you may well find that not only will a much higher percentage of open area help but the more rigid surface may help break up agglomerates.
Lot of thanks for reply. In continuation of above I like to know how one
can change the G force of an screen which is in operation in plant. What
are the probable options to vary throw/stroke/frequency of a screen which
is in operation. How we will optimize the combination of
throw/stroke/frequency for manipulating the G force.
Hi, please read the two papers I have put together:
2 https://www.linkedin.com/pulse/screening-guide-stewart-fernandez?trk=mp-reader-card
3 https://redesign.911metallurgist.com/blog/screening
what is the size of the screen deck - picture of the decks - straight after stopping - what is the feed rate - what is F 80- ( 80 percent of the feed to the top deck ) - what is the moisture content of the material feeding
there are many solutions to your problem, email me (I will send you the questionnaire to be completed), so that I can post a response here for all to learn.
Hi
Is the problem solved.
As suggested by others, check
- Moisture content
- Increase vibration by playing with the counter weights.
- Who is the manufacturer
- Contact me if you need further assistance.
Krishna
Dear all
In our Steel Plant to remove fines from Lump in iron ore, one Double deck screen is installed and is working, but with very poor efficiency. All the top and bottom deck are of Polymer panel. Top panel opening is 22mm sq. aperture and bottom deck aperture is 12mm sq. aperture. But still after screening lot of undersize is coming in Lumps, this causes deterioration in the quality of lumps which is being fed to blast furnace.
Action required to increase the screening efficiency with the same screen may be : (1) change Polymer panel by Poly ripple mesh (2) To make a dam on the bottom deck to increase the particle settling time.(3) To play with the vibration - amplitude of screen (4) At last we can change the screen
Please give the appropriate suggestion to improve the screening efficiency.