Dry ice is widely used in food, sanitation, industry and catering. Mainly: 1. Restaurant decoration, gas creation, film and television special effects, stage and venue smoke manufacturing; 2. Storage and transportation of frozen food; 3. Frozen preservation of poultry meat; 4. Air and sea transportation need to freeze demand for a long time; 5. Medical cryopreservation; 6. Heat treatment and low temperature shrinkage of metal parts; 7. Frozen food preservation and emergency refrigeration in case of power failure in fresh supermarkets; 8. Anhydrous refrigeration and fire fighting; 9. Industrial cleaning and descaling is one of the biggest uses of dry ice at present and in the future. 10, artificial rainfall 1 1, greenhouse fertilization, cast steel, etc.