Different carbon treatments for steel slag powder and their …
Steel slag powder is the waste slag produced in the steelmaking process, and its emissions account for about 15%–20% of crude steel production in China (Shi et al., 2022a; Shi, 2004; Wang et al., 2011).However, a large amount of steel slag cannot be effectively utilized, which resulting in a large amount of steel slag stockpiled (Li et al., 2021).
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The Incorporation of Steel Slag into Belite …
The potential use of steel slag from treated steel slag in belite-sulfoaluminate cements was investigated in this study. Cement clinkers with two phase compositions were synthesized, allowing the incorporation of different …
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Laboratory Preparation and Performance Characterization of Steel Slag …
Steel slag is generally regarded as a supplementary cementitious material in cement-based materials, which is conducive to the realization of the goal of carbon peak and carbon neutralization. However, the lower cementitious activity and poorer volume stability of steel slag limit its high dosage in cement-based materials. In this paper, steel slag ultrafine powder …
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IOM3 | Recycled steel slag meets cement clinker
After the recycled steel is tapped off, the liquid slag is cooled rapidly in air, and ground up into a powder that is virtually identical to the clinker that is the basis of new Portland cement. The researchers are now testing its durability, but early trials suggest that, in the right conditions, the cement can be chemically identical to ...
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Steering the early strength of clinker-free cementitious …
Previous research indicated that Portland cement clinker is replaced by secondary cementitious materials such as steel slag and fly ash could potentially reduce CO 2 equivalent emissions by up to 1.3 Gt [11].Our researches demonstrate that industrial solid waste has the same chemical compositions as cement clinker, such as dicalcium silicates (C 2 S), tricalcium …
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Innovative utilization of carbonated steel slag in low-carbon …
Due to the substitution of cement clinker by carbonated steel slag, the cement clinker content decreases, resulting in a reduction of generated hydration products and a gradual decrease in compressive strength. The strength of MW-50(C20) is similar to that of LC 3-(20–30) (with a clinker content of 20–30). When carbonated steel slag is used ...
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Hydration mechanism and orthogonal optimisation of mix proportion …
Steel slag and blast furnace slag-based clinker-free concrete has very low early strength. This paper focuses on the effect of different curing temperatures on the compressive strength of clinker-free concrete and on optimising the mix proportion by orthogonal tests based on the perspective of prefabricated concrete, and then discusses the hydration procedures.
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Effect of steel slag powder on the sulfate corrosion …
Steel slag comprises 10–15 % of the steel production output and has a mineral composition similar to that of Portland cement clinker (C 3 S, C 2 S, RO phase) and, theoretically, should have high cementitious properties. Because steel slag is generated after rapid cooling at temperatures above 1600 ℃ (higher than the formation temperature of ...
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Steel slags in cement-based composites: An ultimate review …
The presence of steel slag in the clinker manufacturing process reduces the sintering temperature of raw meal and is also associated with reducing CO 2 ... respectively. Similarly, for an addition of 20% steel slag powder, the compressive strengths of 5-h and 1-day were almost 5% and 30% higher than the reference paste, respectively, and at 60 ...
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Sustainable Utilization of Steel Slag from Traditional …
With the rapid development of China's steel industry, rising rates of steel production have led to the increase of steel slag emissions. Steel slag is a kind of industrial solid waste produced in the process of iron and steel smelting, and its emission is about 15 wt%–20 wt% of crude steel output [].According to the data released by the World Iron and Steel …
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Investigation on industrial trial production of multi-phased clinker …
Steel slag multi-phased clinker implemented trial production in cement plant for the first time, which provided an effective low carbon strategy for comprehensive utilization of granular steel slag to produce high quality cement clinker.The results show that through optimizing process parameter of cement kiln system, superior qualified clinker was produced stably along with a …
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Comparative analysis of carbonation strengthening …
Ethanol was added to the steel slag powder to ensure thorough mixing, followed by10 min of ultrasonic treatment. Drops of the resulting suspension were then applied to a copper grid, and images were captured using an accelerated voltage of 200 kV. ... Process to utilize crushed steel slag in cement industry directly: multi-phased clinker ...
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Investigation on the Role of Steel Slag Powder in Blended …
Steel slag powder has the most obvious effect on the 3 d strength of blended cement. For example, when 20% steel slag powder is added, the 3d strength of blended …
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Greener phosphogypsum-based all-solid-waste
Steel slag powder (SSP), with similar minerals components to cement (Jiang et al., 2018), is potentially practicable as the activator, thus resulting in greener all-solid-waste EPSC.But steel slag is often named the "over-burnt Portland cement clinker" (> 1600 °C) (G et al., 2013), which means it owns coarse crystalline and consequent much lower activity than cement.
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Research on mineral characteristics of converter steel slag …
Compared with cement clinker, C 2 S in steel slag is predominant, whose diffraction peaks of are the strongest, ... In addition, as the cost of steel slag powder is lower than that of GBFS, if GBFS is widely substituted for composite powder in cement and concrete, which not only can resolve the shortage of GBFS, but also can reduce the ...
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Hydration superposition effect and mechanism of steel slag …
Steel slag-slag composite powder (SSCP) has three exothermic peaks, which are the dissolution peak, hydration peak of steel slag and pozzolanic ash reaction peak of GBFS …
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The mechanism of hydration reaction of granulated blast furnace slag
Metallurgical solid waste produced in the iron and steel industry and cement clinker has the same chemical compositions such as C 2 S, C 3 A and C 4 AF. By using granulated blast furnace slag and steel slag as admixtures, a series of concrete with different excellent properties such as high strength, low heat release, and strong chlorine fixation was developed [[1], [2], [3]].
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Experimental Study on Calcination of Portland Cement Clinker …
In order to increase the utilization rate of stainless steel slag, reduce storage needs, and mitigate environmental impacts, this study replaces a portion of limestone with varying amounts of stainless steel slag in the calcination of Portland cement clinker. The study primarily examines the influence of stainless steel slag on the phase composition, microstructure, …
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Process to utilize crushed steel slag in cement industry …
The steel slag powder is thoroughly mixed with other raw meal powder, while those larger steel slag particles are wrapped in raw meal powder and enter the rotary kiln. ... Moreover, clinker minerals in steel slag produce an effect of seed crystal, reducing the nucleation barrier and promote the formation of clinker minerals like C 3 S and C 2 S ...
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Hydration and mechanical properties of cement-steel slag …
Considering that the chemical compositions of converter steel slag is similar to that of Portland cement clinker, using steel slag as supplementary cementitious material (SCM) is a promising way owing to the dual benefits of resource utilization and environmental protection. ... Properties of 5-year-old concrete containing steel slag powder ...
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Utilization of steelmaking slag in cement clinker production: A review
To improve the utilization efficiency of steel slag in cement industry, cement clinkers are prepared by simulated multi-phased clinker sintering technology with crushed steel …
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Application of molten iron desulfurization slag to replace steel slag …
The strength activity index of atmospheric-pressure mineralized steel slag reaches 95.8 % on 28 d due to the dissolution of the barrier layer during hydration process, with pozzolanic activity being the most improved. ... cement clinker (CC): gypsum powder (GP):NaOH: slaked lime (SL) by analyzing the physical and chemical properties of CSS and ...
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Hydration Mechanism of Sustainable Clinker-Free Steel Slag …
More than 600 million tons of slag are generated globally every year, leading to multiple environmental issues. Thus, research on applications of slags is crucial. The use of steel slag in cement is limited by its low hydraulic activity and volumetric instability. In the current study, we present a clinker-free steel slag binder (SSB) and discuss the coupled alkali–sulfate …
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Hydration superposition effect and mechanism of steel slag powder …
For example, it contains a large amount of hydrated inert minerals, such as RO phase and Fe 3 O 4, so the activity of steel slag, especially the early activity, is much lower than that of cement ...
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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 …
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Physical properties and chemical composition of …
Steel slag is more wear-resistant than blast furnace slag. The main chemical composition of steel slag is basically similar to that of Portland cement clinker and blast furnace slag. The content of crushed steel slag varies …
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Experimental Study on Calcination of Portland Cement …
In order to increase the utilization rate of stainless steel slag, reduce storage needs, and mitigate environmental impacts, this study replaces a portion of limestone with varying amounts of …
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Investigation on the Role of Steel Slag Powder in Blended …
Steel slag powder and quartz powder with different particle sizes were prepared using a laboratory ball mill under different grinding times. Then, four types of steel slag powders with median diameter in the range of 10∼15 μm (denoted by R1), 15∼20 μm (denoted by R2), 20∼30 μm (denoted by R3), and 60∼70 μm (denoted by R4) were selected, respectively.
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Use of Slags in the Production of Portland Cement Clinker
The introduction of slag intensifies the formation of belite phase at early burning stages. Some changes in the composition of a 'liquid' phase, which increase its temperature and molten viscosity with the increase of slag composition in a raw mix, also affect the features of crystallization of clinker phases.
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Use of steel slag as sustainable construction materials: A review …
Steel slag: Clinker: Paste: ... Shen et al. (2020) used carbonated steel slag powder as cementitious material, crushed steel slag as aggregate and phosphogypsum as an additive to prepare pervious concrete. The compressive strength of the prepared pervious concrete reached 9.4 MPa, which had a porosity of more than 20% to ensure good water ...
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