Pit & Quarry, November 2016
WASHING CLASSIFYING the capability to control your cut point The finer material exits the overflow at the top of the cyclone with the wastewater and this is sent to settling ponds The sand fraction exits the cyclone at the bottom ready for dewatering and stockpiling You have now eliminated the loss of quality fines to settling ponds not only maximizing product yield but also minimizing operational costs as a result of not having to clean out and re process material from ponds regularly The space required to accommodate settling ponds can also be reduced as a result of the fact that it is now only the waste fines being sent to the ponds rather than quality sand You are able to set up the cyclone configuration to guarantee production of sand specifications in line with the requirements of customers or downstream processes this helps to maximize the commercial value of your sand product and the efficiency of your downstream processes Through the specification of the correct hydrocyclone configuration producers are able to ensure that all the excess minus 200 mesh material is removed while retaining the quality sand in the final product Another important impact is the reduction of health and safety risks on site thanks to the removal of the requirement to regularly clean out ponds for reprocessing REDUCING THE MOISTURE The other main issue experienced as a result of the use of sand screws is the high moisture content of the sand product typically between 23 and 30 percent when it hits the stockpile This is a result of the inability of the sand screw to effectively dewater the product and results in unnecessary double handling of the material and having to store the material for a number of days before it can be sold or used in downstream processes The solution to this problem is to employ a high frequency dewatering 26 PIT QUARRY November 2016 pitandquarry com
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