Crushing, Screening & Conveying

Crushing, Screening & Conveying 2017-04-04T06:57:13+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Crushing.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

Screen efficiency calculation (3 replies)

firebird
10 months ago
firebird 10 months ago

Recently part of our linear screen is damaged. Most of the Coarse ones are going to the undersize chute. The formula for screen efficiency is 100-(% of undersize in the coarse product). However since the oversize is going to the undersize, could I determine my screen efficiency using this formula?

100-(% of oversize in the undersize).

raghdmuhi
10 months ago
raghdmuhi 10 months ago
1 like by David

Screen efficiency is obtained using different equations, depending on whether your product is the oversize or undersize fraction from the screen. The following information is required to calculate the two screen efficiencies;-

  • Qms(f)  = Mass flow rate of solid feed.
  • Qms(o) = Mass flow rate of solid in the screen overflow.
  • Qms(u) = Mass flow rate of solid in the screen underflow.
  • Mu(f)    = Mass fraction of undersize in the feed.
  • Mu(o)    = Mass fraction of undersize in the overflow.
  • Mu(u)    = Mass fraction of undersize in the underflow.

 

The screen efficiency based on the oversize (Eo) is then given by the equation;-

 

            Qms(o) * [1 - Mu(o)]
Eo =     -----------------------------                           ( Equation 1)
             Qms(f) * [1 - Mu(f)] 

 

and the screen efficiency based on the undersize (Eu) is then given by;

 

            Qms(u) *  Mu(u)
Eu =  -------------------------------                        ( Equation 2)
             Qms(f) *  Mu(f)

 

Overall screen efficiency is then calculated by multiplying these two efficiencies together ie;-

E = Eo * Eu                                               ( Equation 3)

Paul Morrow
10 months ago
Paul Morrow 10 months ago

Efficiency is the ratio of the undersize obtained in screening to the amount of undersize available in the feed. It is found by the formula:

And more https://www.911metallurgist.com/blog/screening-screens-capacity-aggregate-plants

firebird
10 months ago
firebird 10 months ago

Really appreciate that guys pawl and raghdumhi. Helps a lot.thanks

 

Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.