The raw material for making dry ice is very simple, which is carbon dioxide. It can be made by changing carbon dioxide into solid carbon, so the essence of dry ice is solid carbon dioxide.

Carbon dioxide is ubiquitous in natural life, and the air is full of a lot of carbon dioxide. It is precisely because the gas carbon dioxide is colorless, odorless and transparent. It's easy to ignore. However, if carbon dioxide becomes solid, it will be widely used. Dry ice is widely used for cleaning all kinds of equipment, refrigerated transportation and artificial rainfall. Therefore, dry ice has been widely concerned, and all countries have carried out mass production. The process of making dry ice is very simple. As long as there are complete facilities to solidify carbon dioxide, dry ice can be made. But if you need dry ice with higher purity, you need extremely sophisticated instruments and equipment.

First, the simple principle of dry ice preparation.

Carbon dioxide is very common and easy to be ignored. If carbon dioxide is placed in a low-temperature and high-pressure environment, it will liquefy to form carbon dioxide liquid. If it continues to be cooled under pressure, it will form a part of snowflake-like solid, which will be collected and squeezed into a massive solid. This is dry ice, which is solid carbon dioxide. It can be seen that the production process of dry ice is very simple, but ordinary workshops can only obtain dry ice with low purity. If you want to obtain dry ice with high enough purity, you need the intervention of large manufacturers in centralized preparation.

Second, the characteristics of dry ice.

Dry ice is formed by pressurized cooling of carbon dioxide, so it is easy to sublimate to form gaseous carbon dioxide at room temperature, and a lot of heat energy will be absorbed in the process. In addition, dry ice is easy to sublimate, and it is only pure carbon dioxide. Cleaning precision equipment with dry ice will not cause secondary pollution.

Third, the main uses and hazards of dry ice.

Because of its easy sublimation and heat absorption, dry ice is often used in artificial rainfall technology to absorb heat from the air when it sublimes. Causes the temperature to drop and increases the possibility of rainfall. Because of its endothermic characteristics, dry ice is also used in refrigeration and transportation and other jobs that require low temperature environment. Dry ice is also used to clean precision equipment because it is pure enough. However, dry ice is also harmful to human body. In a narrow and closed space, sublimation of dry ice will produce a lot of carbon dioxide, which will lead to lack of oxygen in the space and carbon dioxide poisoning in human body. Therefore, dry ice should be properly preserved to avoid accidents.