METHOD AND APPARATUS FOR GRINDING ELASTIC MATERIALS Russian patent published in 1994 - IPC

FIELD: comminution of elastic materials. SUBSTANCE: initial material is preliminarily cooled to brittleness temperature by adding liquid nitrogen, mechanically grinding the material, and arranging heat exchange between the cooled and comminuted material and initial material in a counterflow manner through velocity head of evaporating nitrogen providing a fluidized bed of comminuted material in the initial material. Apparatus for carrying out the invention has cooling pipe connected to bottom part of cooling hopper and to outlet from the grinding arrangement. A cyclone is connected to top part of the cooling hopper to communicate with lower part of the hopper by way of gas discharge pipe. EFFECT: enhanced efficiency of the method and apparatus. 3 cl, 2 dwg