Dispersion-Flocculation Behavior of Fine Lead Particles in an Organic Solvent

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Methyl ethyl ketone (MEK) is a good solvent for polyvinyl chloride (PVC) and it has been proposed for use in PVC recycling. In the recycling process, fine particles of 3PbO·PbSO4·H2O, used as a thermal stabilizer in PVC products, are dispersed and not dissolved in the solvent. To establish methods for removing of 3PbO·PbSO4·H2O particles from the solvent, factors affecting the dispersion-flocculation behavior of the particles in MEK were investigated.<BR>The zeta potential and particle distribution of 3PbO·PbSO4·H2O particles in MEK solutions containing known amounts of H2O were measured. Above 5 vol%H2O in MEK solutions, the zeta potential of 3PbO·PbSO4·H2O particles approached zero and the flocculation of particles was achieved. In addition, it was found that Pb2+ and Cl− affect the zeta potential of the particles. These results indicate that the dispersion-flocculation behavior of lead particles can be influenced by the concentration of H2O, Pb2+, and Cl− in MEK.

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