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Experiments were conducted to study the opportunity of increase of efficiency of seed separation in gravity separator. A complex of physical characteristics of cereal seeds sorted by a gravity separator has been studied. The attributes (physical properties of seed) of gravity separation in fluidized bed were found by using the mathematical method of pattern recognition. These data were used for development of fractional technologies used for separation of difficult divided seed mixture. The separating of an initial seed mixture by indented cylinder on two fractions and processing of each fraction on gravity separator enables to increase efficiency of seed separation on 1015 %.

A new version of a Gravity Separator has been developed to classify components of a seed mixture mainly according to density or to specific gravity of the components. Of the various gravity machines, the most widely used is the separator with a trapeziform deck. The process of separation on gravitational separators with the trapeziform deck is characterized by low specific seed loading on a deck 0.6-1.2 kgm-2c-1 ,as well as high specific electric power consumption 2,23 kWh/t. The developed new Gravity Separator with a rectangular deck allow to increase the specific seed loading in 23 times, as well as to decrease the specific electric power consumption in 1,52 times in comparison with existing analogues. The optimum parameters of new Gravity Separators with the rectangular deck were determined.