1996 Fiscal Year Final Research Report Summary
ADVANCED APPLICATION OF LIME
| Project/Area Number |
07555671
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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 | 試験 |
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| Research Field |
無機工業化学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
KATO Akio Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (50037727)
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| Co-Investigator(Kenkyū-buntansha) |
JYONOSONO Keiko Kyushu University, Faculty of Engineering, Research Associate Assistant, 工学部, 教務員 (20260713)
NAGASHIMA Satoko Kyushu University, Faculty of Engineering, Assistant, 工学部, 助手 (20190184)
TSUCHIDA Kiyoshi Kyushu University, Faculty of Engineering, Assistant, 工学部, 助手 (50188562)
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| Project Period (FY) |
1995 – 1996
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| Keywords | CaCO_3 / Coating / Conducting / Coloration |
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| Research Abstract |
1. Conducting coating of CaCO_3
Ag coated calcite was obtained by calination of Ag_2CO_3 coated calcite prepared by ion exchange method from AgNO_3 aqueous solution with the suspension of calcite particles. The coating on calcite was most uniform by calcination at 400-500ﾟC of the particles prepared at 40ﾟC,under [AgNO_3]=1.8*10^<-2>M and suspension of calcite=1-4g/1 for 3-6h. The conductivity of Ag coated calcite was measured by Impedance gain-phase analyzer (Solartorn, SI-1253).
2. Synthesis of colored CaCO_3
(1) Solid solution with transition metal ion
The crystallization of CaCO_3 by co-precipitation from mixed aqueous solution of Ca(NO_3)_2 and Na_2CO_3 homogeneous precipitation using (NH_2)_2CO was investigated in the pressence of Ni^<2+>, Co^<2+>, Mn^<2+> or Fe^<3+> ion. The resulting CaCO_3 was colored slightly with the color of metal ion. The addition of Ni^<2+> and Mn^<2+> made change the lattice constant of calcite particles prepared at 35ﾟC.The lattice parameter of aragonite prepared at 90ﾟC with Mn^<2+> ion addition also changed. These results suggest their substitution for Ca^<2+> ions in CaCO_3.
(2) Coating of Ni compound on CaCO_3
Ni compound-coated CaCO_3 particles were prepared by heating Ni (NO_3)_2 aqueous solution with the suspension of calcite particles. Calcite was most uniformly coated by NiCO_3・6H_2O and colored light green by the reaction at 70ﾟC,under [Ni (NO_3)_2]=0.01M and suspension of calcite=0.1M for 5h.
(3) Coating of CO compound on CaCO_3
As coating of Ni compound, Co compound-coated CaCO_3 particles were prepared. The coating was most uniform at 70ﾟC,under [Co (NO_3)_2]=0.001-0.01M,and suspension of calcite=0.1M for 5h. The color of resulting particles were measured by UV seactro photometer (Hitachi Co., U-3300). The color of deposit was blue under [Co (NO_3)_2]=0.001M,and violet under [Co (NO_3)_2]=0.01M.
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