Process and apparatus for cleaning particulate solids

Details Process and apparatus for cleaning particulate solids Process and apparatus for cleaning particulate solids

E - Fixed Constructions

21

B

E21B 21/06 (2006.01) B01D 11/02 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2076636

2076636 9113232 PCTABS00007 The invention relates to a process and apparatus for removing or cleaning contaminants from particulate solids and comprises at least two successive cleaning zones (A, B), each of which involves two stages. The initial stage (2, 12) involves slurrying the contaminated solids with a solvent for the contaminants and the subsequent stage (7, 17) involves centrifuging the slurry to separate the solids from the solvent containing dissolved contaminants. The overall flow arrangement provides for introduction of fresh solvent (11) to the last cleaning zone (B), directing the separated solvent containing dissolved contaminants (3) from the last cleaning zone (B) to the next preceding cleaning zone, and repeating the sequence through the initial cleaning zone (A). In this manner, the solvent flow from cleaning zone to cleaning zone is countercurrent to the flow of contaminated solids while, within each of the cleaning zones, the solvent and contaminated solids flow in cocurrent relationship. For a given volume of solvent, the invention allows for greater cleaning effectiveness.

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