B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 9/02 (2006.01) C02F 1/22 (2006.01) C02F 1/30 (2006.01) C02F 1/32 (2006.01) C02F 1/36 (2006.01) C02F 1/48 (2006.01) C02F 1/62 (2006.01) C25D 21/16 (2006.01)
Patent
CA 2142146
Inorganic metallic compounds, particularly salts, ox- ides and hydroxides, are removed from solutions by removing at least a part of the solution liquid and stirring and cool- ing this part while in the metastable state until a crystal- lization of the metallic compounds is rendered possible. Then energy is fed in bursts to the cooled down part in order to initiate the crystallization. The crystallized metallic com- pounds are separated, leaving a residual liquor which then is transferred back to the solution. Suitable forms of energy are ultrasonic energy, direct current energy, alternating current energy, micro wave en- ergy, magnetic energy, laser radiation energy or ultraviolet radiation energy. Preferably, the removed part of the solution is stirred and cooled until a first temperature is reached at which an exothermic reaction starts that is caused by the liberation of the heat of crystallization. Then, the liquid is kept at a second temperature which is 0.5 to 1° C below the first tem- perature during 2 to 4 minutes prior to separating the inor- ganic metallic compounds from the liquid.
Barrigar & Moss
Leutwyler Rene
LandOfFree
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