1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
  2. ALL NEW MEMBERS READ THIS FIRST!! Thank you for joining Heavy Equipment Forums! If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!!

Screening sand and rocks

Discussion in 'Screen/Wash Plants' started by Juice, Mar 5, 2013.

  1. Juice

    Juice Active Member

    Joined:
    Sep 28, 2010
    Messages:
    25
    Occupation:
    Underground Mining Foreman
    Location:
    Townsville
    Hi all,
    Can anyone steer me right?
    I'm just starting out screening sand and rock at my sand quarry.
    Can anyone tell me what's the best,most efficient way of screening my rocks.
    Do I screen the largest size out first then keep going down to smallest size I want?
    OR, Do I screen for the smallest size first then work upwards?
    Sand gets screened leaving me rocks from 5mm to 250mm as rejects.
    Any ideas would be greatly appreciated.
    Thanks.
     
  2. grandpa

    grandpa Senior Member

    Joined:
    Oct 16, 2009
    Messages:
    1,789
    Location:
    northern minnesota
    Juice.... The best way is do it all in one pass... lol,,, but I know this is unrealistic. You probably will have to take the big ones off first,, if you take the small ones out, the big ones will break the small screen apart. Every pit screens differently, moisture content,, clay content,,, all these variables come into play, so there is no black and white answer.

    A screen that has enough throw on the deck to bounce the big rocks up off the screen, might have too much throw for the fine particle's and might actually make them stick (called pegging) into the screen... Im sure I've given you plenty to think about so will wait for your reply for now.... Gramps
     
  3. JDOFMEMI

    JDOFMEMI Senior Member

    Joined:
    Jan 4, 2007
    Messages:
    3,074
    Location:
    SoCal
    It also depends on how many sizes you are making. Do you need 1, 2, 3, or more sizes?
    Are you crushing as well, or just screening? What is the makeup of the feed material?
    You can get a portable plant with a 3 deck screen and in theory make 4 products, but what you are putting in versus what you are expecting to get may dictate more handling.
    Generally you take the oversize off the top, then the largest nominal size and work down to the smaller material at the bottom.

    There are lots of tricks to get the most out of the equipment.
     
  4. Juice

    Juice Active Member

    Joined:
    Sep 28, 2010
    Messages:
    25
    Occupation:
    Underground Mining Foreman
    Location:
    Townsville
    I was hoping you'd say that men, as it's what I was thinking.
    I've got a portable, twin deck screener to give me 3 products.
    I screen raw river sand with a lot of different size rocks.
    Sand is my bread and butter, but the rocks are the cream.
    I'll be producing 4 sizes when I finish getting the screens I want.
    Don't really want to touch raw product more than twice, however the end results justify some handling.
    That's until I make enough money to run another screener in sequence!!
    Thanks:eek:
     
  5. cdm123

    cdm123 Senior Member

    Joined:
    Nov 12, 2009
    Messages:
    270
    Location:
    manitoba canada
    I find screening from large to small work best espesialy in clean material as if you take all the fines out the rock tends to roll back down the conveyor.
     
  6. Garrie Denny

    Garrie Denny Senior Member

    Joined:
    Jul 20, 2011
    Messages:
    507
    Occupation:
    see above
    Location:
    Gin-Gin,Queensland
    Are you screening near the Bohle ? or more North West, say running river,the star river ?