Synthesis of the ettringite containing chromium(III) and chromium(VI)

• Autorzy: Kozak, A. A. , Kozak, A. J. , Kowalski, Z. , Wieczorek-Ciurowa, K.
• Języki publikacji: EN

Abstrakty

EN

A compound Ca6[Cr(OH)J2(CrO4)3(n-6)H2O was synthesised which has a structure of ettringite type and formula, where n is uncertain but probably at least 26 and possibly 32, as in ettringite. On being heated in air, it becomes amorphous at 323K and at higher temperatures gives CaCrO4 and CaO. It is probably a new compound, since no data was found about such a substance.

Słowa kluczowe

PL

etryngit; stabilizacja termalna

EN

Cr(III)Cr(VI)-ettringite; ettringite; thermal stability of Ca6[Cr(OH)6]2(CrO4)3-(n-6)H,O.

• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2002
• Tom: Vol. 4, nr 4
• Strony: 17-18
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Kozak, A. A.

• Institute of Building Materials and Structures,

autor

Kozak, A. J.

• Institute of Chemistry and Inorganic Technology, Cracow University of Technology, Warszawska Street 24, 31-155 Cracow, Poland

autor

Kowalski, Z.

• Institute of Chemistry and Inorganic Technology, Cracow University of Technology, Warszawska Street 24, 31-155 Cracow, Poland

autor

Wieczorek-Ciurowa, K.

• Institute of Chemistry and Inorganic Technology, Cracow University of Technology, Warszawska Street 24, 31-155 Cracow, Poland

Bibliografia

• (1) Taylor, H.F.W., Cement Chemistry, London, 2 Edition, 1997.
• (2) Kurdowski, W., Chemia Cementu, PWN. 1991.
• (3) Buhlert R., Kuzel H.-J., Uber den Einbau von Cr3+und Fe3+ in Ettringite [On the introduction of Cr3+ and Fe3+into ettringite], Zem.-Kalk-Gibs 1971, 24(2), 83 - 85.
• (4) Bensted J., Varma S. P., Studies of ettringite and its derivatives. Part II - Chromate substitution, Silicates Indust. 1972, 37(12), 315 - 318.
• (5) Gross S., Bentorite. A new mineral from Hatrurim area, west of the Dead Sea, Israel, Israel J. Earth Sci. 1980, 29, 81 - 84.
• (6) Struble L. J., Synthesis and characterization of ettringite and related phases, Proc. Int. Congr. Chem. Cement, 8th, Rio de Janeiro 1986, vol. 5, Abla Grafica e Editora Ltda, Rio de Janeiro, 1986, pp. 582 - 588.
• (7) Bensted J., Varma S. P., Studies of ettringite and its derivatives. Cem. Technol. 1971, 73, 100.
• (8) Pollmann H., Kuzel H.-J., St. Auer. Miner. Inst. of University, Erlangen, Germany, ICDD Grant-in - Aid, 1989.
• (9) H. F. Mc Murdie. Powder Diffraction Journal, 1986, 1, 337 - 349.