Method for the removal of metals from an aqueous solution...

Details Method for the removal of metals from an aqueous solution... Method for the removal of metals from an aqueous solution...

2007-07-24

2007-07-24

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

C210S724000, C423S140000

Reexamination Certificate

active

10481844

ABSTRACT:
The invention relates to a method for the removal of metals from their aqueous solution with lime precipitation, in conditions where a precipitate of metal hydroxide and gypsum is formed, which settles well and is easy to filter. The metals are precipitated from their aqueous solutions at a high pH value and the slurry is recirculated several times in the precipitation space, whereby the gypsum is precipitated as separate crystals instead of a solid layer. The method is particularly suitable for neutralization of the aqueous solution from the pickling of refined steel. Using this method enables the removal of metals and fluoride from the water in question.

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