Is it possible to purify water by freezing

Is it possible to purify water by freezing:

There is an opinion that if you first freeze and then defrost water, it will become clean. We already wrote about how and why water freezes . Now let’s talk about what happens to the substances dissolved in it and whether melt water can be considered clean. 

Can water be purified by freezing?

If you put a container of water in the freezer, then after some time an outer shell is formed consisting of ice, which will become thicker as it freezes, while reducing the internal volume of water. 

Most of the known methods or water filtration plant  are used  on the fact that during freezing, dissolved substances are concentrated in this central part of the liquid, that is, if you stop cooling the container and pour out the internal volume of the liquid, the resulting water will be clean. Indeed, conditional brine is concentrated inside, that is, substances dissolved in water. This is due to the fact that the formed hexagonal crystalline structure of ice “pushes” ions of other compounds. This method is called the Labza method by the name of its author.

Visually, the purity of ice can be determined by its transparency. If the ice does not contain muddy inclusions or particles similar to snow, then you have a chance to get almost distilled water. As for cloudy ice or snow, the water obtained as a result of defrosting will be less clean, since these signs indicate the formation of cells with brine in the ice structure. 

An important role in the quality of ice is played by the speed of freezing. The slower this process is, the cleaner the ice will be. The speed depends on temperature, that is, it is better to freeze water at -2 than at -20 ℃. For example, sea ice, although it has less salinity than water, still contains cells with brine in it. 

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