DBPapers

REUSE OF METALURGICAL SLAGS IN ECO-CEMENT CLINKER PRODUCTION

AUTHOR/S: J. PACEAGIU, I. MOHANU, C. DRAGANOAIA
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 741-748 pp

ABSTRACT

The aim of the present research work is to investigate the possibility of adding a mixture
of non-granulated blast furnace slag (NGBFS) and steel slag, two wastes resulting from
metallurgical industry which underwent calcinations previously, in the raw meal for the
production of Portland eco-cement clinker. For this purpose, the NGBFS and steel slag
from ArcelorMitall Steel Galati were analyzed for chemical, mineralogical and heavy
metals contents. Two samples of raw mixes were prepared, one with typically raw
materials (limestone, clay and pyrite cinder), as a reference sample, and another with
limestone, NGBFS and steel slag. The influence of two types of slag on the limestone
decarbonation was assessed by thermal analysis (DTA, TG) and on the burnability of
raw mix by free lime determination at different temperatures. Obtained clinkers were
evaluated by chemical, X-ray diffraction and optical microscopy analyses. Calculation
of the theoretical consumption of heat required in clinker formation was performed. The
CO2 emission from decarbonation decreased up to 43% due to replacing part of
limestone and total of clay in the raw mix, as compared to obtaining Portland cement
clinker under ordinary conditions. Furthermore, both cements obtained from clinkers
grounded with 5% gypsum were tested by determining the standard consistency, setting
time, compressive strength and soundness. It was revealed that the use of the slags did
not affect the mineralogical characteristics of the so produced Portland eco-cement
clinker.

Keywords: eco-cement; CO2 emissions, wastes, sustainable development