摘要：

The device for implementing the method comprises a receptacle (3) whose internal profile has the shape of an asymmetric cone (3d) inside which is arranged a blade (5b) of an agitator (5) to agitate with a slow motion the bath of refrigerating liquid contained in the receptacle (3), an orifice (3i) being provided at the bottom of the cone (3d) and communicating with a pipe (3j) wherein is rotationally driven an Archimedean screw (6a) of an extractor device (6) to evacuate continuously the solid particles.

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