Magnesium hydroxide recovery

Details Magnesium hydroxide recovery Magnesium hydroxide recovery

1993-10-29

1995-01-31

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, B01D 6168

Patent

active

053856716

ABSTRACT:
A method for the separation of magnesium hydroxide from a mixture of particulate magnesium hydroxide and dissolved sodium sulphate in water and for the washing and thickening of the magnesium hydroxide, includes the steps of pumping the mixture from a holding tank 14 through an ultrafiltration module comprising two banks 16, 18 of tubular membranes to which is applied a back pressure so that the dissolved sodium sulphate passes through the membrane pores positioned substantially at right angles to the direction of flow as a permeate; adding water to the holding tank 14 at a rate substantially equal to the permeate flow rate until the sulphate concentration in the magnesium hydroxide is less than a desired level; and then discontinuing the water addition thus allowing the magnesium hydroxide to thicken until a desired viscosity is reached.

REFERENCES:
patent: 3525588 (1970-08-01), Hwang
patent: 4655928 (1987-04-01), Milton et al.
patent: 4810389 (1989-03-01), Mallory
patent: 5240600 (1993-08-01), Wang et al.
Chemical Engineering, vol. 96, No. 1, 1989, Stephen L. Michaels, "Crossflow Microfilters", p. 86.

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