Density Separation Equipment

Original 1919 Patent Application Drawing, hand-drawn with pen and ink on vellum.

Our founders, Sutton Steele & Steele, invented the first dry materials separation equipment, known today as “density or gravity separators, air tables or fluidized bed separators”. Originally developed to concentrate gold and other metallic ores without using water, by 1919, when a patent application for the technology was submitted, this new separator had found its way into many other dry materials markets, including field seeds, peanuts, peas, beans, corn, beach sands, coal, cork, chemicals and many other bulk solids.

The density separation is achieved with basically two components, mechanical vibration and air fluidization. The density separator makes a highly sensitive dry separation on the basis of one of three particle characteristics: density, size or shape. When size and shape are controlled within certain limits, the gravity separator is unmatched in its ability to separate a complex mixture. The density separator provides a graduated progression from the least to most dense, smallest to largest, and least to most aerodynamic, while the Stoner delivers strictly a two-way separation.

Today, Triple/S’ line of density separators and stoners are being used in thousands of applications, from cleaning of leafy spices and peppercorns to reclaiming copper from scrap wire and cable.