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. The use of slag in other cementitious applications is also discussed. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. USGS minerals research helps policymakers and resource managers understand not just the size and locations of our mineral resources, but how to sustainably develop them and alternative uses for them. Ferrous slag is currently underutilized. • Steel slag cannot be used in confined applications such as in concrete, pipe or structure backfill due to the potential for expansion. Slag is used all over the world in road and railway construction and for engineering, and has many advantages over natural rock. See also flux. A tap is inserted in the refractory clay plug so that to make the flow of the liquid iron and slag through a ‘skimmer’ which spates iron and slag. • Blast furnace slag is recovered by melting, • separation from blast furnace that produce molten pig iron. Slags are one of the most natural products of all. 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.. Corrections? Burnt lime has by itself a high melting point of 2,570° C (4,660° F) and is…, …of lightweight concrete, using blast-furnace slag in place of stone as aggregate for floor construction; this reduced the density of the concrete by 25 percent, with a corresponding reduction in the loads the building columns needed to carry. Slags are one of the most natural products of all. The overall use of blast furnace slag is relatively well known for a range of highway construction applications from granular base … However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. 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. Construction , 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 characteristics and Slag, by-product formed in smelting, welding, and other metallurgical and combustion processes from impurities in the metals or ores being treated. Slag is generated in large quantities and has the potential to become a significant source of landfill waste and pollution. Ferrous slag is currently underutilized. Office of Communications and Publishing12201 Sunrise Valley DriveReston, VA 20192United StatesPhone: 703-648-4460, Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data. During the steelmaking process, slags float on top of the molten iron, forming a barrier against oxygen and maintaining the internal temperature. Slag floats on the surface of the molten metal, protecting it from oxidation by the atmosphere and keeping it clean. Pile of steelmaking slag at the ArcelorMittal Indiana Harbor steelmaking facility, Indiana. Steel slag is used as a surface aggregate in HMA paving mixes. Acid mine drainage can happen when air and water mingle with various minerals such as iron sulfide (also known as pyrite or Fool’s Gold), creating sulfuric acid. But some recent research here at USGS might change slag’s poor public image. Slag Rock #789 (Pea Gravel) is a gray black colored aggregate used in both residential and commercial landscape projects such as a Topping Material (Unconfined only). Fig 6: Colour of GGBS. What is Slag? Basic slag is a co-product of steelmaking, and is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. Slag, by-product formed in smelting, welding, and other metallurgical and combustion processes from impurities in the metals or ores being treated. Slag aggregates are obtained by crushing of smelter slag or by special treatment of fire-liquid slag melt (molten slag aggregates). Doing so would both offset the cost of restoring abandoned mine areas, as well as decrease steel manufacturers’ current waste footprint. However, slag could be used to treat acid soils or acid mine drainage. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. Steel slag, once cooled, can be processed similar to ACBFS into aggregate-sized particles that are angular and very dense compared to natural aggregates. Abstract. Manufacturing of „GGBS‟ utilises all of the slag … Steel slag is a byproduct obtained from steel industry. 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. Advocates point to a number of ways in which slag cement makes concrete better and more consistent: • Easier to place and finish Photo by Glen E. "Gooch" Goodwin, Photographer - used with permission. With excess phosphate in water being a significant issue in the Chicago-Gary area, this benefit from slag could be another use for the material and could decrease the need to mine new natural materials for water treatment applications. Our editors will review what you’ve submitted and determine whether to revise the article. Marl and chalk are soft, impure forms of limestone and are sometimes used as liming materials, as are oyster shells. The major components of these slags therefore include the oxides of calcium, magnesium, silicon, iron, and aluminum, with lesser amounts of manganese, phosphorus, and … Phosphate is an important nutrient for plants and is a key ingredient in most fertilizers. 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. Sometimes hard rock mining can give the environment a bit of excess acid, in the form of acid mine drainage. 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. Steel slag is a byproduct of pig iron processing. This result in quenching of the particles which results in granules of size lesser than 5mm in diameter. Ring in the new year with a Britannica Membership - Now 30% off. Ladle furnace reducing slag is a common byproduct in steelmaking of carbon and low alloy steels. Updates? The Utilization of Slag in Civil Infrastructure Construction: George C. Wang: 9780081009949: Books - Amazon.ca Another issue that slag can address in the Chicago-Gary area is too much phosphate in the water. However, slag could be used to treat acid soils or acid mine drainage. Orange, iron-rich precipitate (ochre) from outflow of Lead Queen mine tunnel, after late September 2014 monsoon storm. Research and applied utilization activities for the increased use of ferrous and nonferrous slags in civil and highway construction are presented. Let us know if you have suggestions to improve this article (requires login). 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