CHEMISTRY, MINERALOGY AND MORPHOLOGY OF …

Compare to the oxide composition of OPC and GGBS, steel and stainless steel slags generally contain less lime (CaO), silica (SiO2) and alumina (Al2O3), but contain more quantities of ferric …

Phase evolution at interface between magnesia refractories …

During the steel-slag reaction, [Al] can simultaneously reduce oxides in both the slag and the magnesia refractories, altering the composition and physicochemical properties of the molten steel and slag melt. ... with the white phase notably higher in Ca content than the gray phase. The color variation is indicative of varying degrees of ...

What Makes Colors On Smelting Slag

Blue slag, a by-product of metal ore smelting processes, is a beautiful and often beautifully colored glass that can range from glassy to dull and stony in appearance. It …

Physical properties and chemical composition of …

Steel slag is an aggregate composed of various minerals and glassy substances. Due to different chemical components and cooling conditions, the appearance and color of steel slag vary greatly. The steel slag with lower …

Application of Steel Slag as an Aggregate in Concrete …

Typical morphology of steel slag [].(a) BOF steel slag.(b) EAF steel slag.(c) LF steel slag.BOF steel slag is the solid waste produced in the converter steelmaking process, and its discharge is approximately 100–150 kg per ton of BOF steel [20,21,22,23].BOF steel slag commonly has a grayish-white appearance and a vesicular nature, with many non-interconnected pores [].

Adsorption Removal of Organophosphates from Water by Steel Slag …

Organophosphates are a type of emerging environmental contaminant, which can be removed effectively by adsorption. Here, modified steel slag was examined for its adsorptive performance in the removal of hydroxyethylidene diphosphonic acid (HEDP) from water. Compared to acid (55.3%, maximum removal rate) and base (85.5%) modification, high …

Controlling Molten Iron Chemistry and Metal Fluidity

Slag color indicates the level of iron-oxide contamination: the typical black or very dark slags indicate trouble. A greenish color indicating lower levels of FeO begins to appear at the 1.0% level and progresses to light green at 0.2% FeO content. ... This fact correlates with steel melting practices, which allow the same two-minute interval ...

The Use of Secondary Metallurgy Slag as Soil Corrective in …

For example, BF-BOF route produces ≈200–250 kg of slag (BOFS) per tonne of produced steel. Similarly, steel production by EAF is accompanied by about 100 kg of slag (EAFS) per tonne of steel produced, commonly referred to as black slag due to the high fraction of iron oxide that gives the distinctive black color.

Evaluation of Surface Mixtures of Steel Slag and Asphalt

stones. Steel slag is highly resistant to weathering, as are the TABLE 1 COMPOSITION OF IRON BLAST FURNACE SLAGS AND STEEL SLAG (3) Iruu Blast Compound Furnace Slag (%) Steel Slag (%) Calcium oxide 36-45 25-42 Silicon dioxide 33-42 i5-17 Aluminum oxide 8-16 2-3 Magnesium oxide 3-16 6-10 Iron (FeO and Fe20 3) 0.3-2 20-26 Calcium sulfate 1-3 ...

Properties and Uses of Steelmaking Slag – …

Scrap steel reclamation – Steelmaking slag contains around 10 % scrap steel, which can be reclaimed through crushing, sorting, magnetic separation and screening process. This steel can be recycled. Usage in sinter …

Slag Properties in the Primary Production Process of Mn-Ferroalloys

The thermodynamic and kinetic properties of the carbothermic reduction of MnO in the five-component slag, MnO-SiO2-CaO-MgO-Al2O3, is critical in the production process of Mn-ferroalloys. While the reduction rate is mainly dependent on the presence of a solid MnO phase in the slag for Mn-Fe-alloys, the rate for the Mn-Si-Fe alloys has two distinct steps, a slow step …

Experimental and theoretical study of fire resistance of steel slag

Currently, steel slag has been widely used in many fields such as road construction, soil improvement and building materials. In particular, the mineral composition of steel slag is similar to that of cement clinker, including various oxides such as amorphous silica (SiO 2), magnesium oxide (MgO), alumina (Al 2 O 3), iron oxide (FeO/Fe 2 O 3 /Fe), manganese oxide (MnO/Mn 3 …

Adverse Effects of Using Metallurgical Slags as …

Steel slag, copper slag, lead-zinc slag, and electric furnace ferronickel slag are the most common metallurgical slags. ... Xue M., Li H. Preparation of Cement-Based Color Facing Mortar by Copper Pyrometallurgical Slag Modification: Efficient Utilization of High-Iron-Content Slag. J. Environ. Chem. Eng. 2021; 9:105888. doi: 10.1016/j.jece.2021. ...

Self-healing cold mix asphalt containing steel slag: A …

The steel slag and steel slag powder were utilized as a partial replacement for coarse aggregate, (the size range of 4.75–12.5 mm) and a filler replacement (particles smaller than 75 μm), respectively. The steel slag was provided by the Mobarakeh Steel Company in …

A new method for evaluating the uniformity of steel slag …

A new evaluation method has been developed to assess the uniformity of steel slag asphalt mixture. The original aggregate in the method is replaced by steel slag in the range of 4.75 mm to 9.5 mm. Deep learning techniques are used in this method to select the optimal network as the segmentation network of the framework by comparing DeepLabV3+, U-Net, and …

Types of iron and steel slag : NIPPON SLAG ASSOCIATION

In the same way as air-cooled blast furnace slag, converter slag is cooled slowly by natural cooling and water spray in a cooling yard. It is then processed and used for various iron and steel slag (converter) applications. Approximately 110 kg of slag is generated for each ton of converter steel. Electric arc furnace slag

A Review on the Carbonation of Steel Slag: Properties, …

Steel slag is a by-product of the steel industry and usually contains a high amount of f-CaO and f-MgO, which will result in serious soundness problems once used as a binding material and/or aggregates. To relieve this negative effect, carbonation treatment was believed to be one of the available and reliable methods. By carbonation treatment of steel slag, the …

Steel Slag

Steel slag, a by-product of steel making, is produced during the separation of the molten steel from impurities in steel-making furnaces. The slag occurs as a molten liquid melt …

Effects of Steel-Slag Components on Interfacial-Reaction

Toxic leaching of steel slag and permeable steel-slag–bitumen mixture: Samples of steel slag and PSSBM were ground, 10 g was weighed and put into a polyethylene bottle, then 200 mL of toxicity characteristic leaching procedure (TCLP) extractant (pH = 2.88 acetic acid solution) was added, and then turned over and oscillated for 18 h at room ...

Health Risk Considerations for the Use of Unencapsulated Steel Slag

The predominant way of making steel in the United Sates is by using an electric arc furnace (EAF) to melt scrap steel, which results in the formation of a rock-like material called slag. Among its various applications, EAF slag is used in a loose or unencapsulated form as ground cover material for residential landscaping. However, the slag generated from the EAF …

Heavy metal recovery from electric arc furnace steel slag …

steel slag by using hydrochloric acid leaching ... with lighter color contain a higher proportion of Fe, Mg, Mn and Al while the shady areas contain a higher proportion of Ca and Si [8]. EAF steel slag of 2 samples was analysed by using energy-dispersive x-ray spectroscopy. The primary elements found in the sample A included 29.93% CaO

Comprehensive multiphase visualization of steel slag and …

As a kind of industrial waste in steel manufacturing, steel slag accounts for about 12–15% of steel output [1], [2].China's crude steel output reached 1.03 billion tons in 2021, with steel slag produced exceeding 120 million tons [3].At present, the amount of steel slag stacked in China has reached 1 billion tons, which will cause serious waste of resources and pollution to …

Steel Slag for Roadway Construction: A Review of …

Steel slag (SS) is regarded as a potentially promising alternative material for road construction, which could ameliorate the shortage of high-quality aggregate and environmental pollution of SS accumulation simultaneously. …

Steel slag aggregate property improvement in cold mixed …

The steel slag (SS) selected in this work belongs to the basic oxygen furnace SS, which was produced and aged for 6 months at Wuyang Iron and Steel Co., Ltd. in Henan Province, China. Its appearance is shown in Fig. 1. SS had a grayish-brown appearance with large surface roughness, porosity, and obvious angularity.

Steel Slag

Steel slag is a calcium-rich heterogeneous solid consisting of several solid phases. The calcium in the slag can exist in multiple forms: dicalcium silicate, calcium oxide, calcium carbonate, …

Chemical composition of iron and steel slag

The primary components of iron and steel slag are limestone (CaO) and silica (SiO 2). Other components of blast furnace slag include alumina (Alsub>2O 3) and magnesium oxide (MgO), …

Use of Steel Slag as an Alternative to Aggregate and Filler in …

M040 aggregate (a); M040 CDM aggregate (b); FM040 steel slag and CDM (c); oven slug (d).2.2. Steel Slag in Asphalt Layer. Concerning the asphalt layer, starting from a mixture of bituminous conglomerate defined as "M0" as a reference, the aim of this phase was optimizing the quantity of slag in an asphalt mixture and, subsequently, to identify for this mixture the optimum …

Effect of CO2 wet mineralized steel slag-granulated blast furnace slag

After the color is stable, the depth of chloride ion penetration is used to measure the thickness of the coloring area. ... In this study, steel slag was subjected to wet CO 2 mineralization, and a comparative analysis was conducted on the microstructure, phase composition, and particle size of the steel slag both prior to and following the ...

Chemical, Mineralogical, and Morphological …

This slag is referred to as EAF(L) slag, as it is the ladle slag generated from the refining of the steel from the electric-arc furnace. Edward C. Levy Co. provided representative samples of EAF(L) slag consisting of …

Steel Slag Aggregate

Steel slag aggregate is typically spherical, like natural aggregate but has a rougher and more porous surface. In addition, steel slag generally has a darker color than natural aggregate because it contains more iron oxide. Fig. 8 shows the two aggregates' physical appearance. Scanning Electron Microscope (SEM) analysis was performed to ...

Lesson 2: Slag Color — Carbide Mafia

What is the Slag Color Telling Me? A sample off of a pole dipped in the slag can give you an estimate of its chemistry. Experienced operators use slag color to decide how much slag …

Development of waste heat recovery technology from …

cooling conditions, the appear-ance and color of steel slag are very different. The steel slag with lower basicity is dark gray, while the slag with higher basicity is brownish gray or grayish white. Alt-hough the chemical composition of different steel slag will fluctuate, but some of the main components are roughly the same, as shown in Table 1.

Drying shrinkage and carbonation of steel slag-metakaolin …

The influence of vegetable oil and steel slag aggregates on the drying shrinkage and carbonation performance of steel slag-based alkali activated materials was investigated. Decrease in carbonation rates by up to 19% attributed to the formation of metal soap phases which strongly reduced the gel and small capillary porosity as well as the ...