C - Chemistry – Metallurgy – 01 – D
Patent
C - Chemistry, Metallurgy
01
D
23/19
C01D 7/00 (2006.01)
Patent
CA 1076320
ABSTRACT OF THE DISCLOSURE A method of producing a concentrated sodium carbonate solution low in calcium from calcined natural trona to minimize the deposition of pirssonite on the surfaces of processing equip- ment exposed to the solution from which the insoluble impurities, normally present in natural trona, have been separated. The method comprises dissolving the calcined trona in a hot aqueous medium to form a concentrated solution containing insoluble impurities and soluble calcium salts and adding an amount of pirssonite effective to insolubilize the major portion of the soluble calcium in the sodium carbonate solution. The pirssonite may be added to the calcined trona either before,during or after its dissolution. The pirssonite may also be added by recycling excess muds back to the sodium carbonate solution from which the insoluble impurities have not been separated. In addition, the sodium carbonate solution may be aged in the presence of the contained insoluble impurities prior to their separation from the sodium carbonate solution to reduce the amount of soluble calcium salts.
224985
Gancy Alan B.
Poncha Rustom P.
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