Scholarly record

REUSE OF METALURGICAL SLAGS IN ECO-CEMENT CLINKER PRODUCTION

J. Paceagiu, I. Mohanu, C. Draganoaia

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.

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