Recycling of secondary raw materials is a priority of waste handling in the countries of the European community. A virtual secondary raw material of great importance is the product of the thermal transformation of cement - asbestos. This work illustrates the study of calcination products obtained starting from the product of the thermal transformation of cement-asbestos at 1200 degrees C, added to primary raw materials (kaolin, aluminum hydroxide) and boric acid as mineralizing agent. The calcination has been conducted at 1200 degrees C for 1 hour. The crystallization kinetics has been monitored using in situ high temperature X-ray powder diffraction. The microscopic characterization of the final product of calcination has been conducted with SEM and TEM imaging supported by X-ray microanalysis. The structure refinement was conducted on the powder sample using the Rietveld method. The results are compared with the spectroscopic characterization including Mossbauer and UV-Vis spectroscopies. The final product of the calcination is essentially anorthite (about 89 wt%) with minor spinel (11 wt%). All experimental data converge to support the hypothesis that the anorthite is stoichiometric, and the small amounts of iron detected (1.32 wt%) is Fe(3+) hosted in the structure of spinel.

Structural and spectroscopic characterization of anorthite synthesized from secondary raw materials / A. F., Gualtieri; Andreozzi, Giovanni Battista; C., Giacobbe; G., Lusvardi; C., Viti. - In: PERIODICO DI MINERALOGIA. - ISSN 0369-8963. - 80:2(2011), pp. 231-245. [10.2451/2011pm0018]

Structural and spectroscopic characterization of anorthite synthesized from secondary raw materials

ANDREOZZI, Giovanni Battista;
2011

Abstract

Recycling of secondary raw materials is a priority of waste handling in the countries of the European community. A virtual secondary raw material of great importance is the product of the thermal transformation of cement - asbestos. This work illustrates the study of calcination products obtained starting from the product of the thermal transformation of cement-asbestos at 1200 degrees C, added to primary raw materials (kaolin, aluminum hydroxide) and boric acid as mineralizing agent. The calcination has been conducted at 1200 degrees C for 1 hour. The crystallization kinetics has been monitored using in situ high temperature X-ray powder diffraction. The microscopic characterization of the final product of calcination has been conducted with SEM and TEM imaging supported by X-ray microanalysis. The structure refinement was conducted on the powder sample using the Rietveld method. The results are compared with the spectroscopic characterization including Mossbauer and UV-Vis spectroscopies. The final product of the calcination is essentially anorthite (about 89 wt%) with minor spinel (11 wt%). All experimental data converge to support the hypothesis that the anorthite is stoichiometric, and the small amounts of iron detected (1.32 wt%) is Fe(3+) hosted in the structure of spinel.
2011
fe-spinel; rietveld refinement; kry.as; kry·as; synthesis; anorthite
01 Pubblicazione su rivista::01a Articolo in rivista
Structural and spectroscopic characterization of anorthite synthesized from secondary raw materials / A. F., Gualtieri; Andreozzi, Giovanni Battista; C., Giacobbe; G., Lusvardi; C., Viti. - In: PERIODICO DI MINERALOGIA. - ISSN 0369-8963. - 80:2(2011), pp. 231-245. [10.2451/2011pm0018]
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/388185
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 2
social impact