However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. The Utilization of Slag in Civil Infrastructure Construction: George C. Wang: 9780081009949: Books - Amazon.ca It is mainly composed of calcium, iron, silicon, magnesium and a small amount of aluminum, manganese and phosphorus oxides. The focus is on portland cement, but attention also is given to other types, such as slag-containing cement and high-alumina cement. Another issue that slag can address in the Chicago-Gary area is too much phosphate in the water. Phosphate is an important nutrient for plants and is a key ingredient in most fertilizers. Description Characteristics and Uses of Steel Slag in Building Construction focuses predominantly on the utilization of ferrous slag (blast furnace and steel slag) in building construction. But slag itself has value, and technologies have emerged to recycle and reuse reprocessed, granulated slag in different building materials, such as cement, brick, concrete aggregates, wall materials, and glass-ceramic tiles. Abstract. Use of Steel slag in Bituminous Road Construction • The iron and steel slag that is generated as a by product of iron and steel manufacturing processes can be broadly categorised as blast furnace slag and steel making slag. • Blast furnace slag may be used in concrete. Pile of steelmaking slag at the ArcelorMittal Indiana Harbor steelmaking facility, Indiana. The products of the above reactions, the oxides silica, manganese oxide, phosphate, and ferrous oxide, together with burnt lime (calcium oxide; CaO) added as flux, form the slag. However, slag could be used to treat acid soils or acid mine drainage. The bottom half of the furnace possesses water cooler copper tuyeres, bustle pipe and the equipment to collect slag and liquid iron. Slag. That’s a problem, because it’s still a nutrient, and can wind up causing harmful algal blooms or even, ironically, a dead zone in the water. Omissions? • Blast furnace slag is recovered by melting, • separation from blast furnace that produce molten pig iron. Steel slag is used as a surface aggregate in HMA paving mixes. Outside of the construction industry, it might seem that uses for slag are considered limited. Research and applied utilization activities for the increased use of ferrous and nonferrous slags in civil and highway construction are presented. Photograph by Nadine Piatak, USGS. Molten ash formed upon combustion of coal in some high-capacity boiler furnaces is also sometimes termed slag. Let us know if you have suggestions to improve this article (requires login). To flux the silica produced during steelmaking, limestone and/or dolomite are added, as well as other types of slag conditioners such as calcium aluminate or fluorspar. What are Iron and Steel Slags: Iron and steel slags are co-products of iron and steel production respectively that are used in a variety of applications including but not limited to construction, agricultural, and environmental remediation. Steel slag, once cooled, can be processed similar to ACBFS into aggregate-sized particles that are angular and very dense compared to natural aggregates. It turns out that, although slag is most known for being what’s left when metals have been removed, slag itself might be good at removing some negative chemicals from the environment. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Photo by Glen E. "Gooch" Goodwin, Photographer - used with permission. Slags are principally divided into blast furnace slag and metallurgical slag. But some recent research here at USGS might change slag’s poor public image. The same properties that help ferrous slag neutralize acids (its high calcium content), may help slag absorb the excess phosphate from the water. Steel slag is residue from the steelmaking process, made of minerals like silica, alumina and titanium from iron sand, and combinations of calcium and magnesium oxides. PSC is a hydraulic cement that is manufactured by grinding burnt furnace slag to suitable fineness and mixed with ordinary portland cement in a particular ratio. After air cooling and weathering over several days, this … Slags are one of the most natural products of all. It is an industrial solid waste,… slag in building construction focuses predominantly on the utilization of ferrous slag blast steel slag in building construction characteristics and steel slag is a by product of the steel industry and can be used Concrete made with recycled steel slag is used and the excess phosphate ends up in.! 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