What is ladle furnace slag?
What is ladle furnace slag?
Ladle furnace reducing slag (LFS) is a byproduct of steelmaking industries obtained from the ladle furnace refining of carbon and low alloy steels. This process makes it possible to eliminate the sulphur and takes place in the presence of a basic slag in which the most significant oxides are SiO2, Al2O3, CaO, and MgO.
What is the chemical composition of slag?
The main chemical constituents of the basic-oxygen-furnace slag are CaO, FeO, and SiO2. During the conversion of molten iron into steel, a percentage of the iron (Fe) in the hot metal cannot be recovered into the steel produced. This oxidized iron is observed in the chemical composition of the BOF slag.
What are the main contents of the slag?
The primary components of iron and steel slag are limestone (CaO) and silica (SiO2). Other components of blast furnace slag include alumina (Alsub>2O3) and magnesium oxide (MgO), as well as a small amount of sulfur (S), while steelmaking slag contains iron oxide (FeO) and magnesium oxide (MgO).
What is typical composition of blast furnace slag?
Blast furnace slag is a nonmetallic coproduct produced in the process. It consists primarily of silicates, aluminosilicates, and calcium-alumina-silicates. The molten slag, which absorbs much of the sulfur from the charge, comprises about 20 percent by mass of iron production.
What is the function of ladle furnace?
A ladle furnace is used to relieve the primary process of steel making of many of the secondary refining operations. The main functions of a ladle furnace are as follows. Reheating of liquid steel by electric power which is conducted by graphite electrodes.
What is reducing slag?
It consists of oxidizing slag that is generated during oxidation refining, and reducing slag that is generated during reduction refining. Approximately 70 kg of electric arc furnace oxidizing slag and 40 kg of reducing slag are generated for each ton of electric arc furnace steel.
Why slag is used in cement?
The use of slag in concrete has several benefits, including reduced energy, reduced greenhouse gas emissions, and reduced use of raw materials. – Granulated blast-furnace slag (GBFS)—The glassy granular material formed when molten blast-furnace slag is rapidly chilled, as by immersion in water. …
What are the types of slag?
There are several different types of steel slag produced during the steel-making process. These different types are referred to as furnace or tap slag, raker slag, synthetic or ladle slags, and pit or cleanout slag.
What is slag used in cement?
Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. Once the slag has been cooled and ground to a usable fineness it is stored and shipped to suppliers throughout the United States.
How do you identify a slag?
Slag is one of the materials that is often confused for meteorites. This slag, however, will usually be porous or even bubbly which is a clue that it is not a real space rock. Meteorites, in some cases, may exhibit vesicles, but they are not porous or bubbly in appearance.
Is blast furnace slag toxic?
When SSRS compares with ground granulated blast furnace slag (GGBFS) from iron making, steel slag contains toxic ingredients such as nickel, cadmium, chromium and strontium. These compounds could be harmful not only for environment but also for human health [9,10].
How many types of ladle are there?
The types are: 1. Hand Ladle 2. Shank or Bull Ladle 3. Tea Pot Ladle 4.
What kind of slag is used in a ladle furnace?
LF slag can also be combined with steel fibers, which considerably increase fracture toughness, to produce a high-performance self-compacting concrete using a low-cost industrial by-product such as LF slag ( Anastasiou, Papayianni, & Papachristoforou, 2014 ). First ladle furnaces were constructed in the middle of the 1960s by ASEA in Sweden.
What kind of experiments are done with ladle slag?
Eloneva (5) performed calcium extraction experiments with blast furnace slag, desulfurization slag, ladle slag, and steel converter slag, as mentioned earlier.
What are the different types of steel slag?
There are four types of iron and steel industry slags, namely, the blast furnace (BF) iron slag, the basic oxygen furnace (BOF) the steel slag, the electric arc furnace (EAF) steel slag, and the ladle furnace (LF) basic slag, also called the secondary refining slag or the white slag.
Which is stronger BOF slag or ladle slag?
The processed material is denser and stronger than BF slag. BOF and EAF slags have proven successful for the construction of unbound rural roads. Recently, road trials have been conducted in EAF and ladle slag use as road base and subbase.
What is ladle furnace slag? Ladle furnace reducing slag (LFS) is a byproduct of steelmaking industries obtained from the ladle furnace refining of carbon and low alloy steels. This process makes it possible to eliminate the sulphur and takes place in the presence of a basic slag in which the most significant oxides are SiO2,…