Process for the joint production of sodium carbonate and sodium bicarbonate

摘要

A process for the production of sodium carbonate and sodium bicarbonate out of trona, comprising crushing trona ore and dissolving it in a leaching tank containing a solution comprising sodium carbonate and sodium bicarbonate, and an additive selected from the group consisting of: phosphates, phospholipids, carboxylates, carboxilic acids, and combinations thereof, saturated in sodium bicarbonate, in order to produce solid particles suspended in a production solution comprising sodium carbonate, the solid particles containing insoluble impurities and at least 65% by weight of sodium bicarbonate. The solid particles are separated from the production solution containing sodium carbonate. At least part of the production solution containing sodium carbonate is taken out of the leaching tank.

主权项

1. A process for the production of sodium carbonate and sodium bicarbonate out of crushed trona ore, said process comprising:
introducing crushed trona in a leaching tank containing a dissolution solution comprising sodium carbonate and sodium bicarbonate, saturated or super-saturated in sodium bicarbonate; adding an additive selected from the group consisting of: phosphates, phospholipids, carboxylates, carboxylic acids, and combinations thereof to said dissolution solution; at least partially dissolving said crushed trona in said dissolution solution in order to produce solid particles and a production solution comprising sodium carbonate, said solid particles containing trona insoluble impurities and at least 65% by weight of sodium bicarbonate; separating said solid particles from said production solution comprising sodium carbonate; and taking at least a part of said production solution containing sodium carbonate out of said leaching tank in order to constitute a produced solution comprising sodium carbonate.