Sodium Bicarbonate → Sodium Bicarbonate

Participants

Reaction Steps

In other embodiments for the co-production of sodium carbonate and bicarbonate, a first purge liquor stream exits the sodium carbonate monohydrate crystallizer and is passed to a bicarbonate crystallizer (or reactor) under crystallization conditions to form bicarbonate crystals and to form a second purge liquor stream containing water-soluble impurities. The second purge liquor stream exiting the sodium bicarbonate crystallizer is then passed to a tailings pond under crystallization conditions to form a solid comprising sodium bicarbonate and/or sodium sesquicarbonate and containing these water-soluble impurities, at least a portion of such solid being recovered and dissolved in an unsaturated aqueous sodium carbonate-containing solution for recycling in the co-production process. Alternatively or additionally, some or all of the first purge liquor stream may be treated with magnesium before it is fed to the sodium bicarbonate crystallizer and some or all of the second purge liquor stream may be treated with magnesium before it is fed to the tailings pond.

Provenance & Evidence