Method for treating a fluid comprising salts and system for implementing the method

Process for treating a fluid, comprising:

• A step of introducing fluid to treat into a chamber of a dryer;
• A step of drying the fluid in the chamber by putting at a temperature comprised between 30° C. and 90° C. and at a pressure comprised between 10 mbars and 900 mbars, the drying step comprising a sub-step of evaporating at least some of the fluid, producing at least water vapor, and a sub-step of increasing salt concentration of the fluid contained in the chamber, the drying step comprising:
• a first phase during which a weight of the chamber reduces and when the weight of the chamber reaches a lower threshold or a rate of variation of the weight of the chamber is less than a first predefined value, the drying step comprises a step of complementary filling of the chamber until the weight of the chamber reaches an upper threshold;
• and
• a second phase during which the weight of the chamber decreases and when the rate of variation of the weight is less than a second predefined value, the process comprises
• A step of extracting a solid residue in powder form.