Methods of improving centrifugal filtration
AssigneeVirginia Tech Intellectual Properties, Inc.
InventorsRoe-Hoan Yoon, Ramazan Asmatulu
Life of this patent
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Abstract
Methods of improving the efficiency of solid-liquid separation during centrifugal filtration have been developed. They consist of increasing the pressure drop across the filter cake using extraneous means such as increasing the gas pressure inside a filter chamber and/or applying vacuum on the outside. The extraneous means of increasing the pressure drop is designed to increase the rate of removing liquid (water) during the drainage period of the centrifugal filtration process and, hence, lower the amount of the residual liquid (water) left in the filter cake.
Claims18
A method of performing solid-liquid separation during centrifugal filtration comprising:
- feeding a slurry into a filtration chamber, the slurry comprising at least a particulate component and a liquid component;
- rotating the filtration chamber to apply a centrifugal force to at least a portion of the slurry, whereby the particulate component forms a cake on a porous member;
- allowing the liquid to migrate through an interior surface of the cake, until the liquid is substantially removed from the interior surface of the cake;
- and
- providing a compressed gas to the filtration chamber, whereby a positive pressure gradient is produced across a thickness of the cake for removing the liquid from an interior of the cake.
A method of performing solid-liquid separation during centrifugal filtration comprising:
- enclosing at least a portion of a filtration chamber in a vacuum chamber, wherein the filtration chamber is in communication with an exterior atmosphere;
- feeding a slurry into a filtration chamber, the slurry comprising at least a particulate component and a liquid component;
- rotating the filtration chamber to apply a centrifugal force to at least a portion of the slurry, whereby the particulate component forms a cake on a porous member;
- allowing the liquid to migrate through an interior surface of the cake, until the liquid is substantially removed from the interior surface of the cake;
- and
- evacuating the vacuum chamber, whereby a positive pressure gradient is produced across a thickness of the cake for removing liquid from an interior of the cake.
A method of performing solid-liquid separation during centrifugal filtration comprising:
- enclosing a filtration chamber in a vacuum chamber, wherein the filtration chamber is in communication with an exterior atmosphere;
- feeding a slurry into a filtration chamber, the slurry comprising at least a particulate component and a liquid component;
- rotating the filtration chamber to apply a centrifugal force to at least a portion of the slurry, whereby the particulate component forms a cake on a porous member;
- allowing the liquid to migrate through an interior surface of the cake, until the liquid is substantially removed from the interior surface of the cake;
- providing a compressed gas to the filtration chamber;
- and
- evacuating the vacuum chamber, whereby a positive pressure gradient is produced across a thickness of the cake for removing the liquid from an interior of the cake.
Dependencies are inferred from the claim text.