Hello there,

Firts of all, you have to define what you expect from the screener. Qualify your process. I.e. that you as user define where the cutpoint should be and then you have to specify the percentages of contamination you allow, the product loss you allow and then finally as Izaharis mentioned already: take a sample of feed and all fractions and wit a set of test sieves you have to analyse what you get. From the results, you can calculate the efficiency.

Good luck! ■

Originally Posted by tanmaytega

How to find the efficiency if the screen is double deck and

oversizes of both the top and the bottom deck comes on to a single coveyor?

Plz suggest some methods for this.

Good Morning,

you need to invest in testing seive screen sets to determine

your volume of oversize per cubic foot or cubic meter of "screened ores"

to determine the percentage by volume or weight ■

IF DOUBLE DECK screen:

1. determine screen opening in wirecloth on top deck and the bottom deck first

2. go to discharge LIP...or end of the last piece of wirecloth and measure how deep the material actually is at that point

3. this will identify the BED DEPTH (actual)

4. this will tell you whether you are EFFICENTLY screening or NOT...(or carrying over fines that should pass)

the rule of thumb for bed depth is: for EXAMPLE:

1" SQUARE OPG IN THE WIRECLOTH: you should have no more than 4x the opening in the wirecloth MAX, preferably 3x

for what VSMA calls efficient screening: it is 95% passing the opening..not 100% by the way.

(your 2 decks passing to the same conveyor could be a LOAD RELIEVING DECK above the screening deck, to keep the bed depth within the guidelines of VSMA to screen more EFFICIENTLY. is your product the 2nd deck thrus?

PS: hello Izaharis...buddy. ■

Originally Posted by George Baker

IF DOUBLE DECK screen:

1. determine screen opening in wirecloth on top deck and the bottom deck first

2. go to discharge LIP...or end of the last piece of wirecloth and measure how deep the material actually is at that point

3. this will identify the BED DEPTH (actual)

4. this will tell you whether you are EFFICENTLY screening or NOT...(or carrying over fines that should pass)

the rule of thumb for bed depth is: for EXAMPLE:

1" SQUARE OPG IN THE WIRECLOTH: you should have no more than 4x the opening in the wirecloth MAX, preferably 3x

for what VSMA calls efficient screening: it is 95% passing the opening..not 100% by the way.

(your 2 decks passing to the same conveyor could be a LOAD RELIEVING DECK above the screening deck, to keep the bed depth within the guidelines of VSMA to screen more EFFICIENTLY. is your product the 2nd deck thrus?

PS: hello Izaharis...buddy.

Hey George buddy,

I was unsure if he was using a relieving deck scenario or not.

He needs to invest in a set of testing sieves and a sample splitter

though if he does not own them.

Yet again another reason for the Bradford Breaker.

Happy Boxing Day and Merry Christmas, George and Gary. ■