C - Chemistry – Metallurgy – 01 – D
Patent
C - Chemistry, Metallurgy
01
D
C01D 5/00 (2006.01) C01D 7/12 (2006.01) C01D 7/16 (2006.01) C01D 7/18 (2006.01)
Patent
CA 2387884
A process for the preparation of potassium sulfate, sodium bicarbonate and sodium carbonate. The process involves the treatment of potash brines by the reaction of sodium chloride and potassium chloride with calcium sulfate and sodium sulfate. Syngenite precipitate is produced and a first filtrate containing sodium chloride and potassium chloride. The syngenite precipitate is treated with ammonia or ammonium ions and carbon dioxide at between 70 ~C and 100 ~C, with the result being calcium carbonate precipitate and a second filtrate containing ammonium sulfate and potassium sulfate. The second filtrate is cooled to a temperature of between 20 ~C and 40 ~C and treated with potassium chloride. A potassium sulfate precipitate results. The sodium bicarbonate is precipitated from the first filtrate.
La présente invention concerne un procédé d'élaboration de sulfate de potassium, de bicarbonate sodium et de carbonate de sodium. Ce procédé fait intervenir un traitement de saumures de carbonate neutre de potassium par réaction de chlorure de sodium et de chlorure de potassium avec un sulfate de calcium et du sulfate de sodium. Le précipité de syngénite est traité à l'ammoniaque ou aux ions ammonium et au gaz carbonique à une température se situant entre 70·C et 100·C, ce qui donne un précipité de carbonate de calcium et un second filtrat contenant du sulfate d'ammonium et du sulfate de potassium. On fait redescendre la température du second filtrat entre 20·C et 40·C, et on le traite au chlorure de potassium. Il en résulte un précipité de sulfate de potassium. Le bicarbonate de sodium résulte de la précipitation du premier filtrat.
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