Method and apparatus for sorting particulate material...

Details Method and apparatus for sorting particulate material... Method and apparatus for sorting particulate material...

B - Operations, Transporting

07

B

B07B 13/00 (2006.01) B07C 5/34 (2006.01)

Patent

CA 2142759

The invention concerns a method of sorting particles according to theirthermal properties. In the method, the particles (26, 28) are thermally treated in such a manner that particles of one type, typically diamonds, have a temperature which is below the freezing point of a liquid and lower than that of particles of a second type, typically rock particles associated with diamonds. The thermally treated particles (26, 28) are located on a perforated conveying surface and the conveying surface is caused to pass through a body of the liquid. The relevant parameters, such as time and temperature, are selected such that particles of the first type become firmly secured to the conveying surface as a result of a body of frozen liquid being created on those particles and extending on both sides of the conveying surface. Particles of the second class are not secured to the conveying surface in this manner. Thereafter, the different types of particles, which are respectively secured and unsecured to the conveying surface, are separately recovered from that surface.

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