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AssigneeSolvay SA
InventorsPerrine Davoine, Francis M. Coustry, Jean-Paul Detournay, Kurt Allen
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Process for the joint production of sodium carbonate and sodium bicarbonate crystals, according to which: a solid powder derived from sodium sesquicarbonate, having a mean particle diameter comprised between 0.1 and 10 mm is dissolved in water; the resulting water solution is introduced into a crystallizer, wherein a first water suspension comprising sodium carbonate crystals is produced; the first water suspension is subjected to a separation, in order to produce crystals comprising sodium carbonate on the one hand, which are valorized, and a mother liquor on the other hand; and a part of the mother liquor is taken out of the crystallizer and put into contact in, a gas liquid contactor, with a gas comprising carbon dioxide, in order to produce a second water suspension comprising sodium bicarbonate crystals, which are separated and valorized. A reagent powder comprising sodium bicarbonate crystals made by such process.
A method for reducing the amount of alkali lost in evaporative ponds which are fed with a purge liquor containing such alkali, comprising:
A method for treating a purge stream containing sodium carbonate, comprising:
A method for extending the life of tailings ponds produced from a soda ash purge stream containing sodium carbonate, which method comprises treating said purge stream with gaseous carbon dioxide, wherein said purge liquor is a part of a mother liquor taken out of a sodium carbonate crystallizer and comprising at least 175 g/kg sodium carbonate and at least 20 g/kg sodium chloride.
Dependencies are inferred from the claim text.