C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/166
C01F 7/50 (2006.01) C01B 33/26 (2006.01) C01F 7/54 (2006.01)
Patent
CA 1183671
A B S T R A C T The invention relates to a method for recovering useable products from waste products deriving from the manufacture of aluminium fluoride on the basis of aluminium hydroxide and fluosilicic acid. Silica contaminated with fluorine and aluminium and obtained in the manufacture of aluminium fluoride is dissolved with a strongly basic hydroxide, whereafter the first solution obtained is mixed with a second solution, obtained by dissolving aluminium hydroxide with a strongly basic hydroxide, and with waste mother liquor and optionally also washing water from the manufacture of aluminium fluoride, in such proportions that the pH-value of the mixture is from about 10-14. The silicate content of the waste products supplied is precip- itated as a silicoaluminate, which is separated off, preferably by filtration, for optional further treatment or for direct use, where- after fluorine, when present in the waste products, is recovered from filtrate by further precipitation, and whereafter the filtrate is passed to a recipient or utilized, for example, as process water in other processes. The fluorine content can be recovered from the filtrate by adding thereto an aluminium compound in an amount suffi- cient to precipitate out substantially all the fluorine contained in the filtrate as a fluoroaluminate respectively, which is then sepa- rated off.
393415
Boliden Aktiebolag
Gowling Lafleur Henderson Llp
LandOfFree
Method for recovering useful products from waste products... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for recovering useful products from waste products..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for recovering useful products from waste products... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1178117