Abstract. Steel slag is a byproduct of the steelmaking and steel refining processes. This paper provides an overview of the different types of steel slag that are generated from basic-oxygen-furnace (BOF) steelmaking, electric-arc-furnace (EAF) steelmaking, and ladle-furnace steel refining processes.
a) supplying Al-killed steel ladle furnace slag comprising silica dioxide in an amount ranging from 1 wt % to 8 wt, based on the total weight percentage of the Al-killed steel ladle furnace slag and aluminum oxide in an amount ranging from 15 wt % to 50 wt, based on the total weight percentage of the Al-killed steel ladle furnace slag;
These different types are referred to as furnace or tap slag, raker slag, synthetic or ladle slags, and pit or cleanout slag. Figure 18-1 presents a diagram of the general flow and production of different slags in a modern steel plant.
The refining slag is a new type steel casting auxiliary materials to meet the requirements for producing low sulphur steel. Its raw materials are fused by the EAF, making this products with 90% 7Al 2 O 3 ·12CaO calcium aluminate contents. Its activity coefficient is more than 70%.
Integrated steelmakers sell blast furnace slag - which is naturally cementitious in quality - into the cement industry. In addition, the slag from the BOS plant such as converter slag and ladle slag has useful properties once weathered to allow for expansion of the lime-bearing material.
Electric arc furnace carbon steel slag is a by-product of the manufacture of steel by the electric arc furnace process (EAF). Production and Processing An EAF produces steel by the melting of recycled steel scrap, using heat generated by an arc, created by a large electric current.
These include furnace or tap slag, raker slag, synthetic or ladle slags. Figure 1 presents a diagram of the general flow and production of …
An electric arc furnace (EAF) is a furnace that heats charged material by means of an electric arc. ... minimising slag carryover into the ladle. For some special steel grades, including stainless steel, the slag is poured into the ladle as well, to be treated at the ladle furnace to recover valuable alloying elements. ...
Abstract. Ladle furnace slag is a by-product of the steel industry, deriving from the second stage of the production process, which presents some cementitious properties, mainly due to its high CaO content.
Because the walls of the pouring ladle are much cooler than the furnace refractory lining, slag buildup is inevitable. The task of continually maintaining clean pouring ladles requires significant labor, and failure to do so may result in costly casting scrap from slag …
Ladle Furnace slag Ladle slag is produced during the secondary refining of steel and is a valuable source of calcium oxide for the cement industry. Ladle furnace slag is produced through the addition of lime (CaO), and dolomitic limestone (CaO.MgO) in the electric furnace.
Recycling of ladle furnace slags Abstract Ferrous industry slag is waste product of all steelmaking manufactures. These materials should be reused or
During ladle arc reheating, slag line life and heating efficiency rely on an optimum medium stirring rate. Alloy addition and desulfurization require more vigorous but controlled stirring. ... ladle stirring. ladle furnace. vacuum tank degasser. Additionally, TruStir can be applied at the caster for temperature homogenization. In one ...
In the blast furnace slag originates from the gangue in the ore, ash in the coal, and the fluxes (lime, doloma, Al 2 O 3 ) that were added to melt the gangue and coal ash so that the slag can be tapped from the blast furnace.
Slag Composition: The composition of furnace and ladle slag is often very complex. The slags that The slags that form in electric furnace melting result from complex reactions between silica (adhering sand and dirt
A Ladle Furnace is used to relieve the primary melter of most secondary refining operations, and its primary functions are: § Reheating of liquid steel through electric power conducted by graphite
** Slag sample taken at the end of ladle treatment. DESULPHURIZA TION CHARACTERISTICS OF LADLE FURNACE SLAGS OF A LOW SULPHUR STEEL 393 C ANADIAN M ET ALLURGICAL Q UAR TERL Y, V OL 46, N O 4
The application of the slag model at the ladle metallurgical facility can increase the life of the refractory and can result in reduced usage of additives to generate sufficient MgO and CaO.
Slag removal. Keeping furnace slags on the molten steel too long can result in a reversion of elements such as phosphorus back into the steel. To avoid this, slag can be removed at slag-skimming stations, where the ladle is tilted forward and a rake scrapes the slag into a slag pot parked beneath the ladle.
Ladle furnace (LF) refining is one of the most widely used global refining methods. In China alone, approximately 12 million tons of LF refining slag is generated annually .Waste LF refining slag usually is of a high basicity and calcium oxide content, which is required for desulfurization in refining slag.
A detailed metallurgical study of ladle slag and its interaction with the powder in the Italic electric steelmaking industry is presented. The majority of the waste material of the recycling ...
secondary metallurgical slag, e.g., ladle furnace slag (SECS) other slags, e.g. de-sulphurisation slag Through careful selection of raw materials, maintaining a suitable process route, tightly controlled manufacturing procedures, appropriate cooling treatments a range of high quality construction, agricultural and other slag products are ...
Highlights Ladle furnace slag is a useful by-product for the improvement of natural clayey soils. Mixtures of soil with LFS have volumetric stability and good bearing capacity. The curing time of LFS–soil mixes is longer than that of ordinary lime–soil mixes. The durability of LFS–soil mixes is better than that of ordinary lime–soil mixes.
electric arc furnace (EAF) slag, and EAF/ladle metallurgy furnace (LMF) slag stockpiles. The three SFS FRAP samples were obtained from Tollway projects around Chicago, Illinois, and approximately one-third of the total aggregate content consisted of BOF slag aggregates. All
Abstract: Ladle furnace reducing slag is a common byproduct in steelmaking of carbon and low alloy steels. After air cooling and After air cooling and weathering over several days, this material is completely ground into ﬁne white particles.
amount of furnace slag into the ladle is slag skimming in combination with a tilting ladle car equipped with an EMS. At slag raking, the slag will be pushed towards the slag rake side under the electromagnetic force, move the steel upwards on the
a large proportion of the mineral phases of ladle slag exhibit hydraulic properties, ladle slag could also have a potential use in the bonded composites in construction. Keywords: ladle (ladle furnace, vacuum oxygen decarburization) slag, reuse, recycling, building sector, civil engineering
Adding ingredients into the ladle furnace causes thermal effect due to heating and melting, decomposition of metal compounds of ingredients, stirring with steel and slag, oxidation and metal transition into the slag [5, 6].
Ladle furnace reducing slag is a common byproduct in steelmaking of carbon and low alloy steels. After air cooling and weathering over several days, this material is …
Ladle Metallurgy. After tapping of steel from a primary steelmaking furnace such as BOF, EAF or EOF, molten steel for high quality or specialty applications is subjected to further refining in a number of alternative processes collectively known as ladle metallurgy.
Slag Composition: The composition of furnace and ladle slags is often very complex. The The slags that form in electric furnace melting result from complex reactions between silica (adhering sand
ladle slag during the treatment in secondary metallurgy units. 2 CHARACTERISTICS OF PLANT EXPERIMENTS AND INDIVIDUAL VARIANTS Plant experiments for optimising the slag mode were ... • a ladle furnace – LF (heated with an electric arc). Altogether 21 melts were realised under plant condi-