Steel slag and its applications in cement and concrete …
Stainless steel slags have less FeO and more SiO 2 in comparison to carbon steel slag [42]. ... The visible density of steel slag is 3.59, dry density is 3.31, saturated density is 3.39, and the water absorption rate of steel slag is 2.3% [77]. Density values are found to be higher than the natural aggregate because of the high iron …
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A Sustainable Method for Chromium Recovery from Synthesized Stainless
Chromium was successfully separated from synthesized stainless steel slag (CaO–SiO2–MgO–Cr2O3) through the addition of waste silicon powder and CaF2. Waste silicon powder shows a promising and environmentally friendly reductant, compared to carbon, achieving the transformation of chromium from stainless steel slag to dispersed …
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Environmental and Geotechnical Assessment of the Steel Slags …
The refining process of the so-called secondary steel making operation produces stainless steel reducing slag (SSRS). SSRS includes argon oxygen …
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Applied Sciences | Free Full-Text | A Review of Modified Steel Slag
In 2019, the world's crude steel production was 2.196 billion tons [].According to the main smelting process, steel slag can be divided into basic oxygen furnace (BOF) slag (also known as converter slag) and electric furnace (EAF) slag [].The molten steel slag produced from the steelmaking furnace goes through different means of processing, …
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Recent applications of steel slag in construction industry
1.3 Utilization of steel slag. Utilization of steel slag in various industries as raw material can provide environmental sustainability and therefore ensure the reduction in exploitation of natural resources (Yüksel, 2017).Toward the sustainable environment, the use of industrial waste can minimize the disposal of wastes to the environment which …
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Carbon capture and storage technology by steel-making slags: …
In these steel-making slag, the average content of CaO is more than 30 wt%, the content of SiO 2 is more than 10 wt%, while the SiO 2 content in stainless steel slag is more than 20 % [8], [9]. Free calcium oxide and magnesium oxide (f-CaO/MgO) are the main factors leading to the instability of steel slag [10].
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Processes for the dry processing of steel slags with LOESCHE …
1 Preliminary considerations. By-products from the steel industry contain valuable contents. So this article mainly refers to approximately 200 million t/a of steel slags from converters and electric-arc furnaces worldwide, and does not discuss blast furnace slags, which have already been processed to a large extent for many years as a latent hydraulic composite …
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Mechanical properties and durability of alkali-activated steel slag
Alkali-activated cement (AAC) is either clinker-less or free, and it is also environmentally friendly due to its low carbon footprint and wide range sources. Industrial wastes, like steel slag and blastfurnace slag, usually have latent hydraulic reactivity, and can be used as precursors of AAC. Both clinkerless and clinker-free AAC were prepared …
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Steel slag in China: Treatment, recycling, and management
In this paper, we reviewed steel slag treatment, recycling, and management in China. Although China's annual slag production reached more than 100 million tons, its utilization rate is only 29.5%. As of 2016, more than 300 million tons of steel slag have not been used effectively. Large steel slag emissions are causing environmental problems ...
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Characterisation of alkali-activated stainless steel slag and blast
Characterisation of alkali-activated stainless steel slag and blast-furnace slag cements. Author links open overlay panel Saeid Ghorbani a 1, Laura Stefanini b 1, Yubo Sun a, ... (GGBFS and EAFSS) were initially dry mixed in a 2 l capacity Hobart mixer for 60 s to achieve a uniform distribution. Standard CEN sand according to EN 196-1 ...
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An Overview of Precious Metal Recovery from Steel Industry Slag
Steel slag is a solid waste of the steel industry, produced during steel production. Three types of slag, namely electric arc furnace (EAF), basic oxygen furnace (BOF), and Linz-Donawitz processed slag (LD-slag) are the steel industry byproducts. That slag comprises precious elements including zinc (Zn), chromium (Cr), iron (Fe), nickel …
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An overview of recovery of metals from slags
The amount of stainless steel slag is the largest among the alloy steel slags and it contains high Cr and a certain amount of Ni. Since stainless steel slag can release a noticeable amount of Cr as high as 1 ppm and its leachate EC 50 value exceeds the standard level of 3000 mg/l, it may cause environmental concerns. It is desirable to treat ...
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A Review of Circular Economy Prospects for Stainless
Considering that the specific amount of slag per ton of stainless steel is from 270 to 335 kg, approximately 15.7 to 19.5 Mt of slag was produced in this year 2) .
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Waste to wealth: Recovery of value-added products from steel slag
It is an extensively used ingredient in the production of stainless steel. On an average stainless steel production uses 66% nickel [126]. Some of the nickel used as an additive ends up in SS. Nickel recovery from SS has been studied with magnetic separation. During this process, both hand-magnet and dry high-intensity magnetic separation is used.
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Stabilization of Stainless Steel Slag via Air Granulation
In stainless steel production, slag from argon oxygen decarburization (AOD) converters is dumped on to the ground and then slowly cooled. The slag undergoes phase transformation from β-dicalcium silicate (β-C2S) to γ-dicalcium silicate (γ-C2S) at approximately 500 °C to 450 °C, resulting in slag volume …
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Hydrometallurgical Processes for the Recovery of Metals from Steel
Flow sheet for recovery of chromium from stainless-steel slag by alkali roasting, followed by water leaching. Full size image. ... The residue after NaCl leaching contained 1.3% Zn, 6.6% Fe, 0.5% Pb, and 19.5% Ca. Its dry mass was about 20% of the dry mass of the original dust. The final residue could be used in the cement industry. …
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Recycling and utilization of high volume converter steel slag into …
Converter steel slag is produced in large quantities as by-product of primary steel-making, which is mainly landfilled or used as an aggregate The high reactivity of converter steel slag with CO 2 makes it an ideal material for CO 2 capture by forming calcite even at ambient temperature and pressure. This reaction can also be used to for the …
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Design and Operation of Dry Slag Granulation Pilot Plant
Dry Slag Granulation. The concept of dry granulation is that molten slag is atomized under centrifugal forces on a spinning disc, and the liquid droplets generated are rapidly quenched and solidified using air to …
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Preface for Thematic Section: Slag Granulation
The slow-cooled slag is crushed, sieved, and ground before recovery of valuable metals via floatation, magnetic separation, or leaching. Thus, investment in …
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A Review of Circular Economy Prospects for Stainless
Abstract The world of stainless steel production was 52 Mt in 2019, and the annual amount of slags including electric furnace, AOD converter, ladle, and casting tundish, was estimated at 15–17 Mt. Nowadays, only a minor fraction of slags from stainless steel production is utilized and a major part goes to landfilling. These slags contain high-value …
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Slurry-Phase Carbonation Reaction Characteristics of AOD Stainless
Argon oxygen decarburization stainless steel slag (AOD slag) has high mineral carbonation activity. AOD slag carbonation has both the resource utilization of metallurgical waste slag and the carbon reduction effect of CO2 storage. This paper aimed to study carbonation reaction characteristics of AOD slag. Under the slurry-phase …
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Effect of process parameters on dry centrifugal granulation
The vitreous contents of BFS particles granulated by stainless steel disk and graphite disk are 88.07% and 92.00%, respectively, which meets the requirements of cement raw materials. The BWI of dry granulated BFS is 18.4 kWh/t, and the grindability of dry granulated slag and water-quenched slag is similar.
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The Comprehensive Utilization of Steel Slag in Agricultural Soils
Examples of slags are steel slag, stainless steel slag, ladle furnace slag, and blast furnace slag; all of these residues have already been tested for agricultural use at some moment, as will be shown in the chapter. ... Nitrogen fertilization associated with steel slag also increases the dry mass production and the absorption of Si by the ...
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Mechanical properties of alkali-activated slag lightweight …
Blast furnace slag is an industrial by-product of thermal power plants and steel plants (Puertas et al., 2000). In China alone, there is 102 million tons of blast furnace slag produced annually; however, only 20–30% slag is used effectively as cement mineral admixtures and the remaining 70–80% is discarded as waste ( Jiao et al., 2018 ...
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Long-term evolution of highly alkaline steel slag drainage waters
As a ubiquitous by-product of steel production, around 61 million tonnes (Mt) of steel slag is generated yearly worldwide. Over half of this (33 Mt per annum) is …
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CN108531672A
The invention discloses a kind of techniques of roller dry process stainless steel slag, include the following steps：S1：It is using roller that high temperature stainless steel slag is cooling for the first time, to grind as temperature be 500 DEG C 700 DEG C, grain size is the tiny materials of 5mm 20mm；S2：The material transmission that step S1 is …
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A Review of Circular Economy Prospects for Stainless
The growth of world stainless steel production in the years 2005–2019 [ 1] Full size image. Differing from blast furnace and converter slags, stainless steelmaking …
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Steel Slag
Steel slag is an industrial byproduct obtained from the steel manufacturing industry. It is produced in large quantities during steel-making operations that use electric arc …
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Copper slag: optimization of productivity and
Copper slag, a by-product from copper smelting industry, is widely used as an abrasive material to remove rust, old coating and other contamination in dry abrasive blasting which is an expensive process and results in significant amounts of particulate emissions and spent abrasive. This paper presents models developed to improve …
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Environmental and Geotechnical Assessment of the Steel Slags …
The refining process of the so-called secondary steel making operation produces stainless steel reducing slag (SSRS). ... preliminary tests lead to estimate optimal moisture content equal 14.9% at dry density equal 2.02 g/cm 3. Four special mixture aggregates: 2–10 mm; 2–25 mm; 2–10 mm and 2–25 mm with 30% addition fraction 1–2 …
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