It is a method widely used in laboratories and industries to separate two elements of a homogeneous mixture, such as salty sea water to obtain salt.
It will not always be a manipulated chemical process, crystallization events occur in nature itself.
Examples of crystallization
- Formation of frost . Water vapor in refrigerators and even in nature itself forms crystallizations on cold surfaces, like a kind of snow.
- Freezing of water . There is no better example than this. At very low temperatures the water changes from a liquid to a solid state .
- Salt formation . The process of desalination of water forms salt crystals. This is very common to see on some beaches.
- Manufacture of aspirin . Acetylsalicylic acid, the active ingredient in aspirin, crystallizes together with heat, ethanoic anhydride and sulfuric acid.
- Crystallization of sugar . Just as salt has its crystallization process, sugar has it too.
- Stalactites and stalagmites . Formations that we find in caves and that have a high calcium content.
- Ice formation in winter . When the temperature drops, in the streets we see ice formations on surfaces at all times, being common on roofs, cars and, of course, in rivers and lakes.
- Silicon Purification. The silicon is melted and allowed to cool to remove impurities .
- Benzoic acid crystallization. This acid is dissolved in acetone with a little water. This mixture will cause the acid to crystallize to the bottom.
- Marine limestone. Some mollusks will form their own refuges after crystallization of calcite or quartz.
- Molecular crystal formation
- Silver crystals for films. These crystals were widely used in ancient photography as they functioned as a sensor that trapped light.
- Calcium oxalate crystals. They are formed in the kidneys by the deposition of calcium and salts.
- Crystallization of uric acid . They form in the joints, presenting problems to move certain extremities of the body.
- Winterization of oils. They are based on crystallization to “clean oils” and obtain purer and more dense. Crystallization plays an important role in this process.
- Diamond formation. After a process of high pressure in coal, one of the consequences is diamonds, which become the most crystalline element resulting.