Process for the joint production of sodium carbonate and sodium bicarbonate

A process for separate valorization of sodium carbonate and sodium bicarbonate out of trona, comprising:

• introducing and dissolving crushed trona ore in a stirred leaching tank containing a dissolution solution comprising sodium carbonate and sodium bicarbonate, saturated in sodium bicarbonate, to produce solid particles suspended in a production solution comprising sodium carbonate, the solid particles containing at least 4% by weight of insoluble trona impurities and at least 65% in weight of sodium bicarbonate, wherein the temperature of said dissolution solution and of said production solution is at least 25° C.;
• separating the solid particles from the production solution containing sodium carbonate;
• drying and valorizing the separated solid particles;
• taking out at least part of the production solution containing sodium carbonate from the leaching tank to constitute a produced solution, said produced solution being valorized separately;
• and
• introducing an extraction water in the leaching tank, wherein the extraction water is pure fresh water or water comprising from 10 to 35 g/kg of sodium carbonate and/or from 70 to 100 g/kg of sodium bicarbonate.