Abstract
The reutilization of waste is a valuable alternative for the preservation of natural resources and the environment. In this sense, Basic Oxygen Furnace (BOF) steel slag is one of the most residues generated in steel the industry. It is estimated that for each ton of steel produced, about 150 kg of steel slag is generated in the BOF process. Generally, the newly produced BOF steel slag is volumetrically unstable, presenting expansive characteristics, and for this reason, its application should be based on stabilization studies. The main objective of this research was to analyze the chemical stabilization process of BOF steel slag by means of carbonation of the material. For this purpose, an experimental method based on hydration and carbonation in 2-meter high slag piles, moistened with sprinklers and instrumented with leaf wetting, temperature, precipitation and carbon dioxide content sensors was used. A control stack was also set up to accompany the stabilization process through the conventional procedure, in which the material is disposed of in large stacks and subjected to the weather conditions for long periods. The laboratory campaigns were developed in the laboratories of the Federal University of Ouro Preto. Thus, through the results obtained, it was possible to conclude that the stabilization method based on hydration and carbonation for the BOF steel slag was efficient, reducing the free lime content to values well below those prescribed internationally.
Highlights
The relevance of issues related to environmental conservation in the various segments of economic activity and government policies has been growing significantly in recent decades
The Basic Oxygen Furnace (BOF) steel slag was subjected to a chemical stabilization treatment, which consisted of hydration and carbonation of the material by means of sprinklers connected to a hydraulic pump
The objective of this study was to processing yard of the BOF steel slag were submit the BOF steel slag to a treatment composed of leaf wetting, temperature process based on timed hydration and and precipitation sensors, as well as the carbonation of the hydrated carbonated slag (HCS) stack and monitor carbon dioxide content (CO2)
Summary
The relevance of issues related to environmental conservation in the various segments of economic activity and government policies has been growing significantly in recent decades. This growth is stimulated by society's environmental awareness and by increasingly demanding environmental legislation. There can be mentioned the improvements provided by the addition of some agricultural and industrial waste, both from the point of view of mechanical properties and durability, to traditional paving materials (Wang et al 2010; Gao et al 2017)). Despite increasingly seeking to invest in equipment and the formation of technical staff capable of solving environmental problems, it continues to generate a large amount of waste (Masuero et al, 2001)
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