According to the principle that the solubility curve of salts with temperature is different, excess solute, i.e. insoluble solute, will separate out from solution.  For example, the alkali is separated out in winter (using changes in temperature).

If the two soluble substances are separated or purified after mixing, whoever is more likely to reach saturation, the technology will use its crystallization process. For example, if sodium chloride contains a small amount of sodium carbonate impurities, the crystallization process of sodium chloride, i.e. evaporation crystallization, will be used; vice versa, the cooling crystallization will be used.  "which is more likely to reach saturation" means that at the same temperature, the smaller difference the solubility of the soluble substance, the easier to reach saturation. Therefore, it is easy to separate out, and its crystallization method will be adopted.

(1) Save energy, water solidification heat is only 1/7 of that the vaporization heat, so The process energy consumption is greatly reduced compared with the distillation method.compared with other desalination methods, the low temperature desalination methodis power saving

(2) Facilities investment is greatly reduced.

(3) Avoid secondary pollution and can recover salts from wastewater and promoting resource reuse for secondary margin.

(4) Pretreatment of the required treatment solution is avoided, and the operation is simple and convenient.

Low temperature desalting technology has the advantages of energy saving, less pollution, less corrosion and scaling, less investment, simple and convenient operation, etc., and is a promising method.

● Purification of inorganic salts such as nickel sulfate, potassium fluoride and potassium chloride by repeated recrystallization of medicines;  Low hypophosphite, cobalt sulfate, copper sulfate, citric acid, etc.;

  ● Ammonium sulfate, sodium sulfate, sodium chloride, etc.  Low sugar alcohol scraper;   ● Grease, refined naphthalene;   ● Desalination and purification of seawater;

  ● Treatment of high salinity wastewater;   ● Strong brine from coal chemical industry;   ● Oilfield produced water with high salt content, etc.