Abstract
AbstractThe development of an environmentally friendly binder can immensely benefit and promote the BF slag fiber industry. Accordingly, in this study, fiber insulation pipes were prepared using water glass, polyvinyl alcohol (PVA), and PVA–glutaraldehyde (GA); moreover, their bulk density, moisture absorption capacity, and thermal conductivity coefficient were measured and compared. The results demonstrated that the values of these three parameters depend on the binder concentration and dosage under certain fiber quality, pipe sizes, and manufacturing process conditions. The best binder composition was proven to be that of PVA–GA, prepared using 3 wt% PVA and 5 wt% GA herein, which facilitated reduction in the bulk density and improvement of the waterproof properties and insulation performance of the slag fiber pipes.
Highlights
Blast furnace (BF) slag is the most important by-product of the iron making process, with approximately 220 million tons generated in China annually [1,2,3]
Bulk density is one of the most important indexes for measuring the thermal insulation pipe quality, which should neither be too low nor too high; this is because an insulation pipe with low bulk density will not achieve the expected insulation effect, significantly wasting the time and the cost invested by the insulation engineering
Using an insulation pipe with a too high bulk density will cause an increase in raw fiber and binder waste
Summary
Blast furnace (BF) slag is the most important by-product of the iron making process, with approximately 220 million tons generated in China annually [1,2,3]. BF slag is predominantly treated via water quenching and subsequently. To utilize both BF slag and its sensible heat, a methodology of using BF slag to produce slag fiber was developed [10,11,12]. Water glass is a kind of inorganic binder that is widely used in industrial production owing to its excellent bonding performance and good heat resistance. Wu et al [16] highlighted that phenolic resin is convenient for curing, demonstrating excellent waterproof properties, thermal stability, and aging resistance. Fiber insulation pipes were prepared using water glass, PVA, and PVA–GA binders.
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