Method for recovering useful products from waste products obtain

Details Method for recovering useful products from waste products obtain Method for recovering useful products from waste products obtain

1981-12-21

1984-03-13

Wyse, Thomas G.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210 91, C02F 160

Patent

active

044366299

ABSTRACT:
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 precipitated as a silicoaluminate, which is separated off, preferably by filtration, for optional further treatment or for direct use, whereafter 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 sufficient to precipitate out substantially all the fluorine contained in the filtrate as a fluoroaluminate respectively, which is then separated off.

REFERENCES:
patent: 3551332 (1970-12-01), Baumann et al.
patent: 4028237 (1977-06-01), Nishimura et al.
patent: 4320012 (1982-03-01), Palm et al.

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