Process for treatment of sodium hydroxide waste liquor...

Details Process for treatment of sodium hydroxide waste liquor... Process for treatment of sodium hydroxide waste liquor...

C - Chemistry, Metallurgy

01

D

C01D 1/28 (2006.01) C01D 1/32 (2006.01) C01F 7/00 (2006.01)

Patent

CA 2129176

A process for treating sodium hydroxide waste liquor containing aluminum, comprising the steps of: adding, to aluminum-containing sodium hydroxide waste liquor, at least one of MgO and Mg(OH)2 in an amount of 0.5 to 3 moles with respect to 1 mole of aluminum to cause a reaction at 70°C or more; and separating and removing a precipitated magnesium-aluminum compound is disclosed. The present invention makes it possible to recover recyclable sodium hydroxide from an aluminum-containing sodium hydroxide waste liquor. Even if the recovering procedure is repeated, no carbonate ions are accumulated. Therefore, it is possible to prevent degradation of the treating solution containing sodium,hydroxide. Further, the by-product is a useful compound, and thus, there is no problem in the reprocessing or disposal of the by-product.

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