Process and apparatus for refining sand
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United States of America Patent
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Aug 29, 2017
Grant Date -
Apr 14, 2016
app pub date -
Oct 7, 2015
filing date -
Oct 8, 2014
priority date (Note) -
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Abstract
A process for refining sand for use as frac sand includes the steps of passing the sand through a first fines separation stage to remove fine particles of contaminant from the sand, reducing the water content of the sand (such as to less than 20%), passing the sand into an attrition scrubber unit containing moving blades to delaminate clay and other contaminants from the sand grains, passing the sand from the attrition scrubber unit through a second fines separation stage to separate fine contaminants from the sand, and dewatering the resulting sand product in a further dewatering stage.
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