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 °C, added to primary raw materials (kaolin, aluminum hydroxide) and boric acid as mineralizing agent. The calcination has been conducted at 1200 °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 Mössbauer 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 Fe3+ hosted in the structure of spinel.

Gualtieri, A.F., Andreozzi, G.B., Giacobbe, C., Lusvardi, C., Viti, C. (2011). Structural and spectroscopic characterization of anorthite synthesized from secondary raw materials. PERIODICO DI MINERALOGIA, 80(2), 231-245 [10.2451/2011PM0018].

Structural and spectroscopic characterization of anorthite synthesized from secondary raw materials

VITI, C.
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 °C, added to primary raw materials (kaolin, aluminum hydroxide) and boric acid as mineralizing agent. The calcination has been conducted at 1200 °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 Mössbauer 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 Fe3+ hosted in the structure of spinel.
Gualtieri, A.F., Andreozzi, G.B., Giacobbe, C., Lusvardi, C., Viti, C. (2011). Structural and spectroscopic characterization of anorthite synthesized from secondary raw materials. PERIODICO DI MINERALOGIA, 80(2), 231-245 [10.2451/2011PM0018].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/23633