Separation of normally hydrophobic plastic materials by...

Details Separation of normally hydrophobic plastic materials by... Separation of normally hydrophobic plastic materials by...

B - Operations, Transporting

03

D

B03D 1/02 (2006.01) B03D 1/004 (2006.01) B03D 1/016 (2006.01) B29B 17/02 (2006.01)

Patent

CA 2073951

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 or the like 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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