Waste with chrome in the Portland cement clinker production.

M.A. TREZZA, A.N. SCIAN

JOURNAL OF HAZARDOUS MATERIALS.

ELSEVIER

Año: 2006

0304-3894

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.