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- W1965971444 abstract "The surface force technique was shown to give useful information concerning the interaction of fatty acid flotation collectors and calcium activator with a negatively charged mica substrate at high pH. Since the surface of ink particles under deinking conditions are enriched mainly by negatively charged groups, these experiments enabled some details of the fundamental mechanisms involved in deinking flotation to be clarified. The preliminary results (carried out at relatively low calcium and fatty acid concentrations) may be summarized as follows: (a) At pH > 10, the negatively charged surface generated a long range DLVO double-layer repulsion and the potential at the mica/electrolyte interface could be estimated. However, at short distances (15 Å from mica contact), a repulsive non-DLVO hydration barrier was detected due to adsorbed Na+. (b) On addition of CaCl2, the Na+ was replaced by the specific adsorption of the less strongly hydrated Ca(OH)+ solution species or more strongly hydrolyzable calcium species. This resulted in the elimination of the hydration forces and mica-mica contact. On addition of fatty acid, no change in the force profile was detected suggesting no calcium was removed from the surface and there was no evidence of calcium soap formation in the surface region. This result implies that under alkali conditions, the calcium does not induce a bridging mechanism in the presence of fatty acid (below the calcium soap precipitation level). In fact, the calcium could only operate as bridging agents if they can specifically bind to the surface, as well as to the carboxylated fatty acid. The “calcium dehydration/destabilization mechanism” was verified by coagulation studies with quartz suspensions. At higher fatty acid and calcium concentrations, calcium soap was precipitated in bulk solution. It was suggested that microencapsulation of the ink particles with hydrophobic species occures through heterocoagulation with the bulk precipitated calcium soap particles." @default.
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- W1965971444 date "1997-05-01" @default.
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- W1965971444 title "Calcium soaps in flotation deinking; fundamental studies using surface force and coagulation techniques" @default.
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- W1965971444 doi "https://doi.org/10.1016/s0927-7757(97)00008-3" @default.
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