D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/65 (2006.01) C02F 1/52 (2006.01) C02F 1/62 (2006.01) C02F 1/66 (2006.01) C02F 11/12 (2006.01) D21C 9/00 (2006.01) D21C 11/00 (2006.01)
Patent
CA 2377695
A method for eliminating detrimental substances in a process liquid. The process liquid has a first pH and, in addition to said detrimental substances, comprises metal ions and suspended material. Carbon dioxide is added to the process liquid in order to bring the process liquid to a second pH, lower than the first pH. Thereby, the metal ions comprise hydroxide builders, wherein the carbon dioxide (CO2) is added in an amount which causes the second pH to be between 8 and 6.5, so that the carbon dioxide primarily forms bicarbonate ions (HCO3-) having a pH-buffering effect and the metal ions primarily form metal hydroxides. Thereafter, the detrimental substances coagulate or agglomerate with the metal hydroxides and are adhered to the suspended material so that they become inactive. The method is advantageously used in connection with pulp and/or paper making processes.
La présente invention concerne un procédé permettant l'élimination de substances nuisibles d'un liquide de traitement. Ce liquide de traitement, qui se distingue par un premier pH, comporte, outre lesdites substances nuisibles, d'une part des ions métaux contenant des adjuvants hydroxyde, et d'autre part des matières en suspension. En ajoutant au liquide de traitement une quantité de gaz carbonique calculée à dessein, on en fait descendre le pH entre 8 et 6,5. Il en résulte que le gaz carbonique donne des ions bicarbonate (HCO¿3?) présentant un effet tampon du pH, les ions métaux formant essentiellement des hydroxydes de métaux. Les substances nuisibles viennent alors se coaguler ou s'agglomérer aux hydroxydes de métaux et adhérer à la matière en suspension, ce qui les inactive. Ce procédé convient particulièrement à la fabrication des pâtes et/ou papiers.
Haias Liviu
Karlsson Anette
Fetherstonhaugh & Co.
Linde Ag
Linde Gas Ag
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