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1. A process for the beneficiation of a comminuted woody biomass feedstock, comprising four steps:
first, sort the feedstock by size on one or more sorting screens, and recover
a first reject fraction of oversize material characterized by cross section dimensions larger than a pre-determined maximum dimension,a second reject fraction of undersize material characterized by cross section dimensions smaller than a pre-determined minimum dimension, anda first accept fraction of material characterized by cross section dimensions larger than the minimum dimension and smaller than the maximum dimension; second, wash and abrade the first accept fraction in a wet debarker having an undersize screen with openings corresponding to the minimum dimension, and recover
a second accept fraction of material that does not pass through the undersize screen openings, anda first water fraction containing material that passes through the undersize screen openings; third, sort the second accept fraction by specific density in a water tank, and recover
a third accept fraction of material that floats,a third reject fraction of material that sinks, anda second water fraction containing suspended material; and fourth, rinse and sort the third accept fraction on a rinsing screen having openings corresponding to the minimum dimension, and recover
a third water fraction containing material that passes through the rinsing screen, anda fourth accept fraction comprising substantially clean white wood pieces characterized by cross section dimensions larger than the minimum dimension and smaller than the maximum dimension.
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