Originally Posted by sganesh

Dear Experts,

We are feeding iron ore pellets or calibrated lump ore from yard to conveyor hoppers for the screen house. In the screen house +50 materials are rejected.

I want to provide grizzly ( stationary sieve ) above hopper, so that any foreign materials going to conveyors will be controlled. The grizzly will be made of Mild steel plates to form square holes. Can you suggest the size of squares (150 mm x 150 mm or 200 mm x 200 mm , so on ).

I will be happy if justification is also.

Thanks and regards,

Greetings and Salutations Sganesh,

The way most stationary grizzly are commonly set up here is where the grizzly is at a 20-40 degree incline angle with a full width grizzly and an extended length to pass the oversize to one side of the screener and away from it as the material is oversize.

it is referred to as a bar grizzly with steel bars spaced to the desired ore size allowing all the ore below the desired size to drop through quickly with no cross members to impede flow.

I can email a simple drawing if you like, a longtitudinal or bar grizzly will take less time to make

than a grizzly with squares openings.

welding it will take longer than procuring and cutting the steel for same and it will last a long time.

I am sure both George Baker and Gary Blenkhorn can provide drawing and pictures or Google portable Screeners and you will see what I am referring to

as most if not all portables have a sloped deck to remove oversize material

It all comes down to how much recrushing you are willing to do to achieve your goal.

I can e mail you a simple sketch if you like and you can size it from there.

lzaharis ■