Process for the recovery of sodium carbonate from salt mixtures

Details Process for the recovery of sodium carbonate from salt mixtures Process for the recovery of sodium carbonate from salt mixtures

1984-08-21

1986-01-14

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

423206T, 423425, 23298, 23302T, C01D 1714, B01D 900

Patent

active

045645086

ABSTRACT:
Mined salt mixtures comprising sodium-carbonate, -bicarbonate, -chloride, -sulfate, and -double salts, such as trona and burkeite, are leached with a bicarbonate-saturated solution and added carbon dioxide to selectively dissolve the sodium chloride, sodium sulfate and burkeite and to precipitate additional trona, leaving a leach residue consisting essentially of trona. The trona is calcined and dissolved, and the carbonate solution is purified, crystallized and dehydrated in a non-convective solar pond yielding high purity sodium carbonate monohydrate which is converted into dense soda ash. The brine solution from the leach may be treated for the recovery of a further amount of trona.

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