NH<SUB>4</SUB>Cl 존재하에서 탄산가스반응법에 의한 구헝 Vaterite 합성

유성구; 류시옥; 박영해; 서길수

HWAHAK KONGHAK, Vol.36, No.2, 262-266, April, 1998

Export Citation

NH₄Cl 존재하에서 탄산가스반응법에 의한 구헝 Vaterite 합성

The Preparation of Spherical Vaterite in the Presence of NH₄Cl by Carbonation Process

유성구, 류시옥, 박영해, 서길수

초록

수산화 칼슘 수용액에 NH₄Cl을 첨가하여 탄산가스 반응법으로 탄산칼슘을 합성하였다. 반응시간, 반응온도, NH₄Cl의 양 그리고 pH에 따른 탄산칼슘 결정형태에 미치는 영향을 연구하였는데, 반응시간에 따라서 탄산칼슘 결정형태에는 많은 영향이 있음을 알 수 있었다. 즉, 2.5wt%의 NH₄Cl용액에 Ca(OH)₂를 용해하여 반응온도 20℃에서 탄산가스반응법으로 입자를 합성시, 반응초기에는 구형의 vaterite가 합성되었으나, 반응시간이 30분을 경과하면 vaterite에서 안정한 calcite로 전환됨을 관찰하였다. 그리고 용액의 pH에도 많은 영향이 있었으나, 반응온도에는 영향이 거의 없었다. 따라서 구형의 vaterite를 합성하는 최적조건으로서 반응온도 20℃, 반응시간 10분 그리고 NH₄Cl의 양은 5.0wt%/H₂O에서 pH의 범위는 9.9-10.5이었다.

Calcium carbonate was precipitated by carbonation in the aqueous solution of Ca(OH)₂ and NH₄Cl as additive. The effect of reaction time, reaction temperature, concentrations of NH₄Cl and pH on the particle shape and polymorphs of calcium carbonate was investigated. The reaction time were found to have a significant effect on the shape and polymorphs of calcium carbonate. In these reaction conditions such as 2.5 wt% NH₄Cl at 20℃, the early stage of reaction, the precipitated calcium carbonate was vaterite, but after 30 minutes, vaterite was transformed to calcite. And pH has effect on the polymorphs, but reaction temperature has no effect on the polymorphs. From these results, we found that spherical vaterites were prepared in the presence of 5 wt%/H₂O NH₄Cl solution for 10 mins at 20℃ and pH range was 9.9-10.5.

Keywords:Calcium Carbonate;Vaterite;Calcite;Polymorphs

[References]

Juvekar VA, Sharma MM, Chem. Eng. Sci., 28, 825 (1973)
Wachi S, Jones AG, Chem. Eng. Sci., 46, 1027 (1991)
Sohnel O, Mullin JW, J. Cryst. Growth, 60, 239 (1982)
Swinney LD, Stevens JD, Ind. Eng. Chem. Fundam., 21, 31 (1982)
Tsuge H, Kotaki Y, Hibino S, J. Chem. Eng. Jpn., 20, 374 (1987)
Kralj D, Brecevic L, Nielsen AE, J. Cryst. Growth, 104, 793 (1990)
Kojima Y, Sadotomo A, Yasue T, Arai T, J. Ceram. Soc. Jpn., 100, 1145 (1992)
Kojima Y, Endo N, Yasue T, Arai T, J. Ceram. Soc. Jpn., 103, 1282 (1995)
Xyla A, Koutsoukos P, J. Chem. Soc.-Faraday Trans., 83, 1477 (1987)
Giannimaras E, Koutsoukos P, Langmuir, 4, 855 (1988)
Mann S, Heywood BR, Rajain S, Birchall JD, Nature, 334, 692 (1988)
Lyu SG, Sur GS, Kang SH, HWAHAK KONGHAK, 35(2), 186 (1997)
Lyu SG, Sur GS, Polym.(Korea), 20(5), 870 (1996)
Lyu SG, Park YH, Sur GS, Polym.(Korea), 21(2), 296 (1997)
Lyu SG, Sur GS, Asia Polym. Symp., 39 (1997)
Kawaguchi H, hirai H, Sakai K, Sera S, Nakajima T, Ebisawa Y, Koyama K, Colloid Polym. Sci., 270, 1176 (1992)
Nakamae K, Nishiyama S, Yamashiro J, Fujimura Y, Urano A, Tozaki Y, Matsumoto T, Nihon-Settyakukyoukaishi, 21, 414 (1985)
Ogino T, Susuki T, Sawada K, J. Cryst. Growth, 100, 159 (1990)
Yasue T, Kogima Y, Arai Y, Gypsum Lime, 247, 471 (1994)
Hakanen E, Koskikallio J, J. Finn. Chem. Lett., 3, 34 (1982)
Juvekar VA, Sharma MM, Chem. Eng. Sci., 28, 825 (1972)
Suan B, Maryadele J, O'Neil Ann S, Patricia EH, "The Merk Index," MERCK & Co., Inc, Rahway, N.J., U.S.A., p. 254 (1989)

[Referenced By]

[1] Juvekar VA, Sharma MM, Chem. Eng. Sci., 28, 825 (1973)

[2] Wachi S, Jones AG, Chem. Eng. Sci., 46, 1027 (1991)

[3] Sohnel O, Mullin JW, J. Cryst. Growth, 60, 239 (1982)

[4] Swinney LD, Stevens JD, Ind. Eng. Chem. Fundam., 21, 31 (1982)

[5] Tsuge H, Kotaki Y, Hibino S, J. Chem. Eng. Jpn., 20, 374 (1987)

[6] Kralj D, Brecevic L, Nielsen AE, J. Cryst. Growth, 104, 793 (1990)

[7] Kojima Y, Sadotomo A, Yasue T, Arai T, J. Ceram. Soc. Jpn., 100, 1145 (1992)

[8] Kojima Y, Endo N, Yasue T, Arai T, J. Ceram. Soc. Jpn., 103, 1282 (1995)

[9] Xyla A, Koutsoukos P, J. Chem. Soc.-Faraday Trans., 83, 1477 (1987)

[10] Giannimaras E, Koutsoukos P, Langmuir, 4, 855 (1988)

[11] Mann S, Heywood BR, Rajain S, Birchall JD, Nature, 334, 692 (1988)

[12] Lyu SG, Sur GS, Kang SH, HWAHAK KONGHAK, 35(2), 186 (1997)

[13] Lyu SG, Sur GS, Polym.(Korea), 20(5), 870 (1996)

[14] Lyu SG, Park YH, Sur GS, Polym.(Korea), 21(2), 296 (1997)

[15] Lyu SG, Sur GS, Asia Polym. Symp., 39 (1997)

[16] Kawaguchi H, hirai H, Sakai K, Sera S, Nakajima T, Ebisawa Y, Koyama K, Colloid Polym. Sci., 270, 1176 (1992)

[17] Nakamae K, Nishiyama S, Yamashiro J, Fujimura Y, Urano A, Tozaki Y, Matsumoto T, Nihon-Settyakukyoukaishi, 21, 414 (1985)

[18] Ogino T, Susuki T, Sawada K, J. Cryst. Growth, 100, 159 (1990)

[19] Yasue T, Kogima Y, Arai Y, Gypsum Lime, 247, 471 (1994)

[20] Hakanen E, Koskikallio J, J. Finn. Chem. Lett., 3, 34 (1982)

[21] Juvekar VA, Sharma MM, Chem. Eng. Sci., 28, 825 (1972)

[22] Suan B, Maryadele J, O'Neil Ann S, Patricia EH, "The Merk Index," MERCK & Co., Inc, Rahway, N.J., U.S.A., p. 254 (1989)