Process for the treatment of fly ash, using hydrochloric acid

D - Textiles – Paper – 21 – C

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D21C 11/06 (2006.01)

Patent

CA 2365967

The invention relates to a process for the treatment of fly ash accumulating in the electro-filter of the soda recovery unit in a sulfate cellulose mill, the ash containing primarily Na sulfate, Na chloride, Na carbonate and K sulfate, to produce industrial raw materials, in which process the fly ash is dissolved in water, the carbonate present therein is broken down with hydrochloric acid to Na chloride, a sulfate precipitation chemical in chloride form is added, the sulfate precipitate obtained is separated from the solution, and the chloride-containing solution is recovered.

L'invention concerne un procédé de traitement de cendres volantes s'accumulant dans l'électrofiltre de l'unité de récupération de soude dans une usine de cellulose au sulfate, les cendres contenant essentiellement du sulfate Na, du chlorure Na, du carbonate Na et du sulfate K, afin de produire des matières premières industrielles, procédé dans lequel les cendres volantes sont dissoutes dans de l'eau, le carbonate y étant présent étant décomposé à l'aide d'acide chlorhydrique en chlorure Na, un agent chimique de précipitation du sulfate sous forme chlorure étant ajouté, et le précipité de sulfate obtenu est séparé de la solution puis la solution contenant du chlorure est récupérée.

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