C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
C25B 15/08 (2006.01) C01D 3/16 (2006.01) C25B 1/34 (2006.01)
Patent
CA 2279003
A method for the reduction of soluble aluminum species in an evaporated salt alkali metal halide brine containing up to 500 ppb aluminum species to provide a brine feedstock suitable for use in a chlor-alkali membrane cell process, said method comprising treating said brine with a magnesium salt in an amount to provide a Mg to Al molar ratio selected from 5 - 20 to 1 at a Mg concentration selected from 0.5 - 10 ppm, and sufficient alkali metal hydroxide to provide an excess alkalinity concentration of between 0.1 - 0.5 g/L alkali metal hydroxide to effect precipitation of a magnesium aluminum hydroxide complex; and removing said complex to provide said brine feedstock.
Mok Felix
Subramanian R. Ganapathy
Gowan Intellectual Property
Kvaerner Canada Inc.
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