C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/62.5
C25B 1/26 (2006.01) C01D 3/16 (2006.01) C25B 15/08 (2006.01)
Patent
CA 2006611
The invention relates to a process for the reduction of the perchlorate content in electrolytes for chlorate production, whereby the electrolyte is subjected to the following process steps: a) a part of the flow of an electrolyte leaving the chlorate process is evaporated at an elevated temperature of, for example, from 30 to 110~C and/or at a reduced pressure to a reduction in liquid volume of from 1 to 4 times, b) the product from the previous step is cooled to a temperature of from 30 to 0~C, to produce a cooled solution having a concentration of sodium perchlorate of at least about 40 g/l, c) to the product from the previous step is added a potassium chloride solution with a concentration of at least 1.0 mole/l up to the saturation concentration, d) the product from the previous step is relieved of solid phase and recirculated to the chlorate process.
Cette invention concerne un procédé de réduction de la teneur en perchlorate d'électrolytes servant à la production de chlorate. Il comprend les étapes de traitement suivantes de l'électrolyte : a) évaporation à température élevée, entre 30 et 110 °C par exemple, et/ou sous pression réduite d'une partie de l'électrolyte quittant le procédé pour une réduction du volume liquide dans une proportion de 1 à 4 fois; b) refroidissement du produit de l'étape précédente à une température de 30 à 0 °C pour obtenir une solution refroidie ayant une teneur en perchlorate de sodium d'au moins 40 g/l environ; c) ajout à la solution refroidie d'une solution de chlorure de potassium ayant une concentration d'au moins 1.0 mole/l et pouvant atteindre la saturation; d) extraction de toute phase solide de la solution ainsi obtenue et recirculation vers le procédé de production de chlorate.
Eka Nobel Ab
Swabey Ogilvy Renault
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