The Minnesota Fracsand Company (MFC), a division of J. L.
Shiely Company, requested the assistance of the Coleraine Laboratory
of the NRRI in determining a method of beneficiating one of
the products of the quarry at Jordan, Minnesota. MFC wishes to
sell the product, called "plus 18", as a hydrofracturing sand for
use in oil and gas wells. Most of the "plus 18" consists of well
rounded quartz grains that are suitable for this application. However,
about 20 percent of the product consists of agglomerate
particles of small quartz grains cemented by iron oxide. These
particles, called clusters, fail under pressure so that unacceptably
large volume losses of more than 18.5 percent occur during the
compression test for hydrofracturing sand. The maximum loss for
this size sand is 16 percent so the cluster content must be reduced
to a level that will produce acceptable crush resistance test
results. A small sample of "plus 18" was submitted by MFC for
preliminary work to determine potential beneficiation methods.
Examination using a low magnification microscope indicated that dry
high-intensity magnetic separation (HIMS) could be an appropriate
method of removing the clusters. Subsequently a concentrate
produced on a laboratory model HIMS machine at Coleraine and tested
by MFC met the volume loss requirement.
University of Minnesota Duluth, Natural Resources Research Institute, 5013 Miller Trunk Highway, Duluth, MN 55811-1442
Niles, H. B.
Beneficiation of Hydrofracturing Sand from the Minnesota Fracsand Company.
University of Minnesota Duluth.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.