Pit & Quarry, August 2017
The finish screen or secondary screen on the 1830 plant is shown here This electric portable plant contains a 6 ft x 20 ft triple deck screen with a 44 in x 32 ft twin sand screw two 24 in product cross conveyors all mounted on a triple axle chassis Plus 1 2 in material off this screen is recirculated back to the secondary 4250 for further reduction while finished products include 1 2 in x 3 8 in 3 8 in x 3 16 in and 4 x 0 having a clean saleable rock is essential for Anderson Columbia Like a lot of washing plants theres a significant challenge associated with obtaining and managing the large amount of water required to wash and clean material OBryan says The dirty water can be managed conventionally but having process equipment allowed Anderson Columbia to remove a large percentage of the solids before the water ever reached the ponds We helped each on the front end to get the plant specd out and all of the process equipment sized he adds But also when we were designing the plant our electrical team worked to make controls accommodations where necessary and to incorporate starters into the MCC for some of the pumps According to OBryan some after sale controls are being incorporated to help Anderson Columbia accommodate the varying amounts of clay in the material When the plant feed is very dirty the operators need to reject more material at the primary but of course the resulting feed to the secondary then has a lot less material and a coarser gradation because weve dropped a lot of that fine dirt out of it he says The PLC upgrades monitor a belt scale on the secondary and increases or decreases plant feed to ensure that the secondary receives a consistent number of tons per hour P Q www kpijci com pitandquarry com
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