Title in English Study of the effect of steel slag crystallinity on the slag-blended cement physicochemical properties Abstract in English The use of steel slag, the main byproduct of the steel industries of the process of converting pig iron into steel as raw material for the production of Portland cement by replacing part of blast furnace slag, offering economic and ecological benefits, as that an industrial - waste becomes the raw material in cement production, reducing energy costs, equipment and tanks for storage of waste. For this study, steel slag was subjected to remelting and cooled at different rates, with the goal of forming slag with different degrees of crystallinity. Were determined the start time and end handle, compressive strength after 3, 7, 28 and 91 days of conformation, hot and cold expandability. The results confirm that the steel slag has the potential to be used in the cement industry. The verification of the influence of the addition of slag will support the National Steel Company CSN on the feasibility of changing the current cooling process and the allocation of the new waste.
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ABSTRACT This study focuses on the technical feasibility of the utilization of waste from the cutting of granite to adjust the chemical composition of slag from steelworks LD, targeting the addition of clinker Portland cement. We selected samples of the waste, mixed, melted and cooled in water and in the oven. Samples cooled in water, after examining with X-ray difractrograms, had been predominantly amorphous. For samples cooled in the furnace, which had vitreous, there was the presence of mineralogical phases Akermanita and Gehlenita, which is considered as the ideal stage for the mineral water activity of the slag.
The adjustment of the chemical composition of the slag from steel works by the addition of waste granite was efficient, transforming the waste into a product that is the same as blast furnace slag and can be used in the manufacture of cement.
Keywords: LD of steelworks slag, residue of granite, Portland cement. Segundo Cruz et al. Duas outras misturas foram deixadas para resfriar, dentro do forno, para se verificar se as fases Akermanita e Gehlenita eram formadas. Nota-se, pelas figuras, que ambas as amostras apresentaram estado amorfo devido ao resfriamento brusco da mistura. SiO2 e 2CaO. Esse resultado sugere que os compostos presentes nas amostras com basicidade 0,9 e 1,2 sejam iguais. A amostra com basicidade 0,9, apresentada nas Figuras 6a , 6b , e a amostra com basicidade 1,2, apresentada nas Figuras 6c e 6d , apontam para o fato de que ambas amostras podem ser compostas por Gehlenita Ca2Al2SiO7 e Akermanita Ca2Mg Si2O7.
Disto pode-se afirmar que, provavelmente, os compostos Akermanita e Gehlenita foram formados pelo novo processo proposto.
Porto Alegre, v. Tese de Doutorado em Engenharia. Tese de Doutorado. Aprovado em 28 de janeiro de
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Mixture of Granite Waste and LD Steel Slag for Use in Cement Production