or of a delay means or else of any intermittently operating device the control 11 is designed to ensure the delayed opening of the sealing means 10 whenever the body 6 is at least partially filled with dry ice the body 6 is equipped on its wall 7 with a connection 12 equipped with a filter 13 and a calibrated or ballasted non return valve 14 the connection 12 is connected to a recovery pipeline 15 leading to the inlet of a compressor 16 the outlet of which is connected to the exchanger of a refrigerating machine 17 itself connected to an intake connection 18 of the storage tank 1 in a conventional way the tank 1 ensures the storage of a mass m of carbon dioxide in the liquid phase generally maintained at a pressure of between 17 and 25 bars absolute and at a temperature of between 249 u00b0 k and 261 u00b0 k according to the invention the liquid phase of the carbon dioxide is extracted from the tank 1 by means of the drawing off pipe 3 for example at 20 9 bars absolute and at 255 u00b0 k the liquid phase conveyed in this way is expanded in the appliance 5 by means of the calibrated nozzle 9 the characteristics of which are selected so as to maintain an expansion at a pressure of between 1 and 5 18 bars absolute and preferably between 4 5 and 5 18 bas absolute this expansion causes the formation of a solid phase p in the appliance 5 from which it is extracted as a.