2003 Fiscal Year Final Research Report Summary
Development of the adsorbent for heat storage system using iron and steel making slag as source material
| Project/Area Number |
14550681
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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 |
Structural/Functional materials
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
OUCHI Chiaki Tohoku Univ., Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (00312603)
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| Co-Investigator(Kenkyū-buntansha) |
SAHARA Ryoji Tohoku Univ., Institute for Materials Research, Res.Assistant, 金属材料研究所, 助手 (30323075)
NARUSHIMA Takayuki Tohoku Univ., Graduate School of Engineering, Asso.Professor, 大学院・工学研究科, 助教授 (20198394)
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| Project Period (FY) |
2002 – 2003
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| Keywords | heat storage materials / zeolite / zeolite A / iron and steel making slag / blast furnace slag / alkali hydrothermal synthesis / recycling / water vapor adsorption |
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| Research Abstract |
The heat storage system using water vapor adsorption to zeolite materials is getting much attention because of extremely high energy density and flexibility of process. The composition of zeolite A can be shown as M_XAl_XSi_<1-X>・nH_O. The hydrophiic property of zeolite A is excellent because of high Al/Si ration in the zeolite A. The blast furnace slag mainly consists of SiO_2, Al_2O_3, CaO and MgO. Since Ca and Mg can be introduced to zeolite A as M, the blast furnace slag is a promising candidate for source materials of zeolite A. In the present work, the alkali hydrothermal process for production of zeolite A from the blast furnace slag as a source material was investigated. The following results were obtained;
1.Zeolite A can be synthesized from SiO_2-Al_2O_3-CaO slag by hydrothermal treatment in the conditions;
Temperature: 328-393
NaOH: 0.5-3 M
NaOH solution : slag (source material): 15 (mug)
2.The zeolite A synthesized by the hydrothermal process was thermally stable up to 873 K.
3.In order to obtain zeolite A from blast furnace slag in the hydrothermal process, the adjustment of composition was needed. It was required to decrease the content of CaO+MgO in the blast furnace slag. The less the content of CaO+MgO, The more the ratio of zeolite A to total products after hydrothermal synthesis.
4.The rate of the hydrothermal reaction increased by using the ball-mill-type chamber.
5.It was confirmed that the zeolite A obtained in the present work was applicable to the heat storage system because endothermic reaction was observed during the heating of the zeolite A.
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