1998 Fiscal Year Final Research Report Summary
Development of fine-particle separation technique using interfacial phenomena in oil-water-solid three-phase system
| Project/Area Number |
08555257
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
資源開発工学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KUSAKA Eishi Faculty of Energy Science, Kyoto University, 大学院・エネルギー科学研究科, 助手 (60234415)
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| Co-Investigator(Kenkyū-buntansha) |
NIINAE Masakazu Faculty of Energy Science, Kyoto University, 大学院・工学研究科, 助手 (50228128)
FUKUNAKA Yasuhiro Faculty of Energy Science, Kyoto University, 大学院・エネルギー科学研究科, 助教授 (60111936)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Liquid-liquid Extraction / Fine particle / Activator / Depressant / Chelating reagent |
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| Research Abstract |
The summaries obtained from a series of studies on the recovery of fine solid particles using oil-water-sold three-phase system are as follows.
In "Effect of hydrolysed aluminum (III) and chromium (III) cations on the lipophilicity of talc," the relationship between the zeta potential and the liquid-liquid extraction recovery in the system was discussed. The hydrophile-lipophile transition of the particle surfaces was well concerned with the hetero-coagulation among oil droplets, solid particles, and metal-hydroxide precipitates.
In "The Role of Hydrolyzed Metal Cations in the Liquid-Liquid Extraction of Ultrafine Silica with Dodecyl Sulfate," it was found that the activation through the addition of metal salts is correlated to the formation of the metal hydroxide, complex or precipitate. These phenomena were compared with the variation in residual concentration of metal species, the pH range where the concentration is reduced being in agreement with that where the high recovery is obtai
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ned.
In "Adsorption of Inorganic Depressants on Synthesized Diamond and Graphite," the adsorption behaviors of the inorganic depressant for fine hydrophobic particles, in particular polyphosphate and silicate, were examined in terms of aqueous pH and depressant concentration. It was confirmed that the adsorption energy of these species in the diamond and graphite surfaces ranged between chemical and physical adsorption.
In "Effect of Hydrolysed Metal Cations on the Liquid-Liquid Extraction of Silica Fines with Cetyltrimethylammonium Chloride," it was confirmed that the metal species act as a depressant in the silica extraction. The feasible mechanism of the above depression is the coating of metal hydroxide precipitates on the silica surfaces in the pH range where the depression takes place.
In "Two-Liquid Flotation of Fine Oxide Particles with 8-Hydroxyquinoline," the recovery of several oxide particles in the two-liquid flotation using a chelating reagent of 8-hydroxyquinoline was investigated, and the optimum condition interms of pH and collector concentration in the oil phase was discussed. Less
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