| Project/Area Number |
12556025
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
林産学
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| Research Institution | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
ISOGAI Akira Graduate School of Agricultural and Life Sciences, Associate Professor, 大学院・農学生命科学研究科, 助教授 (40191879)
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| Co-Investigator(Kenkyū-buntansha) |
ENOMAE Toshiharu Graduate School of Agricultural and Life Sciences, Associate Professor, 大学院・農学生命科学研究科, 助手 (40203640)
MATSUMOTO Yuji Graduate School of Agricultural and Life Sciences, Associate Professor, 大学院・農学生命科学研究科, 助教授 (30183619)
KUGA Shigenori Graduate School of Agricultural and Life Sciences, Associate Professor, 大学院・農学生命科学研究科, 教授 (60012051)
AOYAGI Tetsuo Pulp and Paper Research Institute Co., Ltd., Principle Research Associate, 主席研究員
YAGUCHI Tokiya Research Center, Oji Paper Co., Ltd., Senior Research Associate, 上級研究員
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2000: ¥8,400,000 (Direct Cost: ¥8,400,000)
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| Keywords | Paper sludge / Garbage / Incinerated ash / Recycle / Paper fillers / Paper / Environment / Papermaking |
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| Research Abstract |
Incineration conditions as well as milling conditions of the incinerated ash prepared from paper sludge were investigated in detail in order to establish recycling system of inorganic compounds in paper sludge, because most of these inorganic compounds originate from paper fillers, which are added to paper stock to increase opacity and brightness of paper produced. The results show that paper sludge ash obtained by incineration at 800℃ for 1 h followed by ball-milling in water can be used as recycled paper fillers. Distribution of elements in the incinerated ash particles was analyzed by using a scanning electron microscope attached with an X-ray dispersive analyzer. Calcium carbonate, magnesium carbonate and kaolin clay present in the paper sludge are converted to gellenite by fusion during incineration at the temperature below 600℃. Elementary analysis of garbage-incinerated ash sampled in garbage-incineration centers in Tokyo metropolitan areas showed that calcium, silicate and aluminum are the predominant components, which suggested that these elements originated from paper fillers. These garbage-incinerated ash samples, however, contained water-soluble fraction in the range of 5-20%. Low-crystalline compounds having similar X-ray diffraction patterns were obtained from the garbage-incinerated ash samples by boiling-water extraction. It was impossible so far to improve brightness of paper sludge incinerated ash to more than 70% even by various trials.
The paper sludge incinerated ash was added to paper stock up to 40% to evaluate properties of handsheets containing the ash as fillers. Reduction of tensile index could be restricted by using a dry-strength additive such as anionic PAM. Although brightness of the handsheets decreased with the ash addition, remarkable improvement of opacity was achieved by the ash addition.
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