Patent ID: 8784756
Filing Date: 2014-07-22
Classification: C01D,Y10T

Abstract:
1. 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.