Process for treatment of sodium hydroxide waste liquor containin

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

1994-08-01

1996-07-02

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210912, 423115, 4234202, 423600, C02F 162

Patent

active

055319068

ABSTRACT:
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).sub.2 in an amount of 0.5 to 3 moles with respect to 1 mole of aluminum to cause a reaction at 70.degree. 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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Journal of Solid State Chemistry, vol. 94, No. 2, 1991, pp. 244-253, Ian E. Grey and Roland Ragozzini, "Formation and Characterization of New Magnesium Aluminum Hydroxycarbonates".
Database WPI Week 7648, Derwent Publications, Ltd., London, GB; AN 76-89679X/48 for JP-A-51 117 196 (Nittetsu Mining Ltd) 16 Oct. 1976.
Database WPI Week 8808, Derwent Publications, Ltd., London, GB; AN 88-052711/08 for JP-A-63 008 215 (Kureha Chem Ind KK) 14 Jan. 1988.

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