Separation of normally hydrophobic plastic materials by froth fl

Details Separation of normally hydrophobic plastic materials by froth fl Separation of normally hydrophobic plastic materials by froth fl

1993-05-10

1995-01-03

Lithgow, Thomas M.

Classifying, separating, and assorting solids

Fluid suspension

Liquid

241 19, 241 20, 241 24, 521 425, 521 44, 521 45, 521 465, 209 11, B03D 102, B03D 1008, B03D 1012

Patent

active

053778448

ABSTRACT:
A targeted particulate, synthetic organic plastic material having normally hydrophobic surface characteristics is separated from a mixture of two or more of such plastic materials by conditioning the mixture of plastic materials in a flotation cell with a heteropolar surfactant which has a hydrophile-lipophile balance (HLB) value greater than 5 and which selectively depresses the targeted plastic material by making the surfaces thereof more hydrophilic without substantially affecting the surfaces of the other plastic material(s) and introducing gas bubbles into the resulting conditioned pulp such that the gas bubbles selectively adhere to the surfaces of the other plastic materials(s) and cause them to float. The targeted plastic material is recovered in the cell product and the other plastic material(s) is recovered in the float concentrate.

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