Liquid purification or separation – With heater or heat exchanger – With mechanical agitator or movable separator
Patent
1988-03-18
1988-11-29
Sever, Frank
Liquid purification or separation
With heater or heat exchanger
With mechanical agitator or movable separator
62544, 210181, 210182, 210187, B01D 904, B01D 1700
Patent
active
047879700
ABSTRACT:
A process of the type employing freezing and thawing of metal hydroxide sludge to effect phase separation by gravity settling of solids to permit removal of the purified water, and a preferred system for carrying out the process. Commercially available refrigeration equipment, suitably modified and adjusted to operate in the freezing of sludge in sheets and breaking the sheets into relatively small pieces, is utilized in order to minimize the costs of hardware end controls. The frozen sludge particles are deposited in a melt tank containing a quantity of sludge which has previously been frozen and thawed. The thawed sludge is circulated from the melt tank through a line passing through the condenser of the refrigeration system to absorb heat rejected by the condensing refrigerant, and directed by a valve back to the melt tank to assist in thawing the frozen particles until the level in the tank reaches a predetermined maximum, and then to a settling area until the level of thawed sludge in the melt tank is reduced to a predetermined minimum. The primarily liquid and solid phases are separated after a desired amount of gravity settling.
REFERENCES:
patent: 2703782 (1955-03-01), Regan et al.
patent: 3817048 (1974-06-01), Burley
McGuire Charles S.
Sever Frank
Specialized Process Equipment, Inc.
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