Method and apparatus for grading and washing sand
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United States of America Patent
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Jun 21, 2022
Grant Date -
Apr 1, 2021
app pub date -
Mar 22, 2019
filing date -
Mar 26, 2018
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of grading and washing sand including the steps of removing oversize material from a feed material to which water is added on a first grading screen, whereby the oversize material passes over a downstream end of an apertured deck of the first grading screen, undersize material and water passing through the apertured deck being collected in a sump of the first grading screen before being passed onto an apertured deck of a second grading screen having apertures of a smaller size than those of the deck of the first grading screen, oversize material passing over a downstream end of the second grading screen, pumping water and undersize material from a sump of the second grading screen to a washing stage to remove fine contaminants therefrom.
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