Method for processing waste water containing fluorine and...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/58 (2006.01) C02F 1/469 (2006.01) C02F 1/60 (2006.01)

Patent

CA 2749421

An object (first object) of the invention is to provide a waste water treatment technology (pretreatment technology in particular) which makes it possible to recover fluorine at a high recovery rate as highly pure calcium fluoride, without diluting waste water containing fluorine and silicon, i.e. to recover fluorine from high-concentration waste water containing fluorine and silicon. Waste water containing fluorine and silicon is supplied to a pH controlling tank 1 and sodium hydroxide (NaOH) is added thereto, with the result that sodium silicate is precipitated. Thereafter, the waste water is supplied to a solid-liquid separator 2 so that solid-liquid separation of sodium silicate is conducted.

La présente invention concerne une technique de traitement des eaux usées (et, en particulier, une technique de prétraitement) permettant de recueillir du fluor sous la forme d'un fluorure de calcium de grande pureté avec un bon taux de récupération, sans dilution des eaux usées contenant du fluor et du silicium. En d'autres termes, cette technique de traitement des eaux usées permet de recueillir du fluor sous la forme d'un fluorure de calcium de grande pureté avec un bon taux de récupération, même si le traitement concerne des eaux usées dans lesquelles la concentration en fluor et en silicium reste élevée. Plus précisément, des eaux usées contenant du fluor et du silicium sont déversées dans une cuve servant à l'ajustement du pH (1) et de l'hydroxyde de sodium (NaOH) est ajouté, ce qui entraîne la précipitation de silicate de sodium. Le matériau résultant est ensuite acheminé vers un moyen de séparation solide-liquide (2) et le silicate de sodium est isolé par séparation solide-liquide.

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