CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
artículos
Título:
Waste with chrome in the Portland cement clinker production.
Autor/es:
M.A. TREZZA, A.N. SCIAN
Revista:
JOURNAL OF HAZARDOUS MATERIALS.
Editorial:
ELSEVIER
Referencias:
Año: 2006
ISSN:
0304-3894
Resumen:
Abstract
Hazardous wastes, coming from industries are usually used in the Portland cement
production in order to save energy, costs and/or stabilize toxic substances and heavy
metals inside the clinker. This work focuses on the effect produced on the Portland
cement clinker when it is obtained using tanned leather shavings whit chrome salts as
part of the process. The raw materials were clinkered in laboratory with different
percentages of shavings, which contained 2% of Cr2O3. DTA-TG of the raw mixtures
was performed to evaluate the thermal behavior changes that can take place during the
clinkering process, analyzing the crystalline phases obtained by XRD. The milling
behavior clinkers was studied, analyzing also the refractoriness variation on those
clinkers. The chrome retention was evaluated by leaching tests. The structural
modification determined by the chrome presence in the silicate structure brougth
consequences in the hydration speed, mechanical resistence and pore distribution.2O3. DTA-TG of the raw mixtures
was performed to evaluate the thermal behavior changes that can take place during the
clinkering process, analyzing the crystalline phases obtained by XRD. The milling
behavior clinkers was studied, analyzing also the refractoriness variation on those
clinkers. The chrome retention was evaluated by leaching tests. The structural
modification determined by the chrome presence in the silicate structure brougth
consequences in the hydration speed, mechanical resistence and pore distribution.
Keywords: Portland clinker, dangerous wastes, solidification/stabilization, chrome,
tanned leather shavings.Portland clinker, dangerous wastes, solidification/stabilization, chrome,
tanned leather shavings.