95% Efficiency Top Deck
Diego: Basically 95% efficiency means if we put say 1/2" x 1/2" clear opening on the TOP DECK.
95% efficiency is considered a normal or slightly high efficiency assumption. It assumes top deck screening, as we are using full deck length and width supposedly and will have the MOST likelihood of screening most efficiently. It also ASSUMES certain criteria are met....100# cu/ft material, granualar free flowing, 20 deg slope, DIRECTIONAL shaft rotation on inclined screens.
It also assumes a certain SIEVE analysis split of the FEED material....25% oversize to opening in wire, and 40% halfsize. If we are way out of line on either of these two factors....EFFICIENCY declines. If lots of material that is close or near to the size of the opening in the wire.....equals REAL INEFFICIENCY.......harder to pass the opening.....too much competition between the particles. ■
Re: Carryover Model
Thanks George for your reply.
What I wanted to ask is if there is a model for predicting the granulometric curve of the carry over, that is, the particles that should be passing, but actually they are carried with the oversize.
Thanks, ■
Re: Carryover Model
Like Diego, I am interested in is predicting the precentages of undersize material gradations that are carried over - do not pass through the screen.
You have a screening efficiency of 95%, what is the size distribution/percentage passing of the 5% that is not screened?
Are there anu mathematical models, or is it "assumed" say to be linear, logarithmic, exponential????
Cheers ■
CarryOver model
Anybody has ever seen a model for predicting the carry over in a vibrating screen?
I mean, for the first deck suppose an efficiency of 95%. So the 5% of material that should pass through the screen, actually do not pass. Which is the granulometric curve for this material?. You can suppose even distribution but it will be far from reality. Have you seen a simple model to estimate the granulometry of the carry over ?
Thanks in advance and best regards, ■