Abstract
The purpose of this study was to recycle basic oxygen furnace (BOF) slag in the production of autoclaved aerated concrete (AAC), and to examine the influence on the properties of AAC products. The magnetic substances in the BOF slag accounted for about 15 wt.% and the magnetic proportion increased as the particle size decreased. The nonmagnetic portion of the BOF slag was acquired by a magnetic separation process and its major constituents were Ca (~42 wt.% as CaO) and Si (~35 wt.% as SiO2), which are the essential elements of AAC. When using the BOF slag for AAC production, the bulk density and compressive strength of the specimens decreased as the amount of slag increased. The results of the performance analysis revealed that at appropriate water–solids ratios, using 15 wt.% or less of the BOF slag was beneficial to the properties of the AAC products. In general, it should be feasible to recycle the BOF slag in the production of AAC. However, the foreign elements introduced by the BOF slag can alter the formation and structure of hydrates, including tobermorite, and thus affect the properties of the AAC product, a potential issue that needs to be addressed.
Highlights
Steel slags, including basic oxygen furnace (BOF) slag, electric arc furnace (EAF) slag, and secondary refining slag, are byproducts of the steel-making industry, and the typical weight ratio of steel slag to crude steel output is 0.1–0.15 [1]
BOF slag accounts for approximately half of the total steel slag output, and is usually recycled for cement production, road construction, hydraulic engineering works, engineering construction fills, fertilizers, and other applications [3,4]
Because the AC-F had the smallest particle size and normally accounted for over half of the BOF slag, it was selected as a raw material for aerated concrete (AAC) production here
Summary
Steel slags, including basic oxygen furnace (BOF) slag, electric arc furnace (EAF) slag, and secondary refining slag, are byproducts of the steel-making industry, and the typical weight ratio of steel slag to crude steel output is 0.1–0.15 [1]. BOF slag accounts for approximately half of the total steel slag output, and is usually recycled for cement production, road construction, hydraulic engineering works, engineering construction fills, fertilizers, and other applications [3,4]. In Taiwan, about 1.5 million tons of BOF slag are generated annually, and most of this is reused as asphalt aggregates and backfilling materials. The BOF slag is piling up due to the imbalance between generation and consumption, and this is a threat to the steel-making industry
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