| Project/Area Number |
07650931
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
反応・分離工学
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| Research Institution | Suzuka National College of Technology |
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Principal Investigator |
IWATA Masashi Suzuka National College of Technology, Dept. of lndustrial Chemistry, Associate Professor, 工業化学科, 助教授 (10151747)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | gel / colloid / sodium alginate / calcium ion / mechanical expression / compression-permeability test / bentonite |
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| Research Abstract |
A novel technique for solid-liqued separation of difficult-to-filter colloidal suspensions has been proposed by use of gelation reaction of natural polymers. Colloidal suspensions are mixed with a sodium alginate solution and this mixture are dropped on a calcium chloride solution. resulting in calcium-alginate gels including colloidal particles. Gel suspensions are then drained gravitationally, followed by mechanical expression of gels.
Preparation conditions of colloid-inclusion alginate gels are studied. Bentonite particles are used as experimental materials of difficult-to-filter colloids. Using sodium alginate solutions and calcium chloride solutions of both above 1000 ppm, one can get spherical calcium-alginate gels with sufficient strength for gravitational drainage. The mesh size of gel network was estimated as a size of sub-micro meters from the compression-permeability test : the mesh size is small enough to trap colloidal particles. Bentonite-alginate gels which contain ca. 10 - 20wt% of alginate show the maximum expression tate, since the specific hydrodynamic resistance of the bentonite-alginate gels is one hundredth of original bentonite sludge.
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