In the low water-to- paste, the hydration process can directly affect the autogenous shrinkage, which is a critical issue in UHPC [24], [25]. The interaction of slag and silica fume with cement in fresh water mixed systems and its effect on autogenous shrinkage of UHPC is well documented [26], [27], [28], [29].
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When subjected to water quenching, the molten copper slag discharged from the smelters forms amorphous granulated slag. ... It is evident from the figures that the quantity of acid and water addition plays a significant role in the leaching efficiency. The copper recovery increased with increased acid consumption and followed the same trend …
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Request PDF | On Jul 3, 2020, Jingxiao Zhang and others published Chloride diffusion in alkali-activated fly ash/slag concretes: Role of slag content, water/binder ratio, alkali content and sand ...
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Rashad [24] found that adding 15 wt% OPC to Na 2 SO 4-activated slag decreased the drying shrinkage and increased the 3-day compressive strength 1.6 times higher than that of the control sample. This was ascribed to the role of OPC in rising the heat of hydration and pH of the alkali-activated system. Same trend was observed by Fu …
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The role of SP in FS on HTC preparation is extremely vital and worthy of study. In this paper, FS was successfully used to synthesize HTCs for CO 2 adsorption. Orthogonal experiment was conducted to study the effect of SP on the properties of the synthesized HTCs. ... Coal gasification fine slag (CGFS) is a kind of solid waste …
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In order to evaluate the release of ions in the eluate of slag A and slag R and their chemical stability in aqueous environment, pH and ionic conductivity measurements were collected at different times: 0, 5, 15, 30, 60, 120, 240, 480, 1440 min after immersion in water (Figure 3). For both slags, pH values around 10–11 remained constant ...
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Specifically, the alkali to slag ratio (Ac) and the total amount of the selected activators were varied at a fixed water/binder ratio, molar silica modulus (Ms) and relative mass activators ratio. Microstructures and reaction products were analyzed by means of X-ray diffraction, thermogravimetry, scanning electron microscopy and FT-IR.
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The autogenous shrinkage behavior of alkali-activated slag is regarded as the combined consequence of the effects of chemical autogenous and self-desiccation shrinkages, which occurs at the early reaction stage of the sample; its development is induced by consuming water during the reaction .
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Request PDF | On Oct 10, 2018, Huang Li and others published The role of seawater in interaction of slag and silica fume with cement in low water-to-binder ratio pastes at the early age of ...
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However, there is no quantitative definition between high silicon aluminum and low silicon aluminum slag, which resulted in the inaccurate determination of the role of water vapor in the different slag. Acid slag and basic slag are usually used to distinguish the influence of water vapor on slag viscosity in mold flux and steel slag system.
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This paper mainly summarizes and analyzes the treatment methods of metallurgical slag used as decontamination material and the removal effect of pollutants in water, and considers the stability and recyclability of the material, which …
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Anurag Tripathi. 391 Accesses. 1 Citation. Explore all metrics. Abstract. The metallurgical processes in production of iron and steel from ores produce slags (blast …
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The geopolymer was synthesized by mixing fly ash and slag with the activator solution. The activator solution was prepared by mixing water, potassium silicate, and potassium hydroxide such that SiO 2 /K 2 O = 1.25 and water/solids = 0.32. The amount of slag in the mixture varied from 0 to 15% (by total weight), keeping the total amount of …
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The effects of various parameters, including slag content, water/binder ratio, alkali content, and sand–aggregate ratio, on the properties of AAFS concretes were evaluated. Chloride transport was assessed according to D f. The time dependent water absorption of AAFS concrete was determined.
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Basic oxygen furnace slag was found to be rich in calcium (30.7%), iron (16.9%), silicon (8.0%), and magnesium (5.5%) elements. Based on the elemental analysis, given in oxide form in the Table 1 (top row), the theoretical potential for carbon dioxide sequestration and calcium carbonate production are 377 and 766 kg/tonne of slag, …
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The technology was used for handling heavy aging oil by demulsifier and three phases horizontal scrow centrifuge. Through laboratory and field test, it showed that the water content of the processed aging oil dropped from 50% to 5% below, purity oil recovery rate reached more than 95%, meeting export quality requirements. The technology …
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Indeed, several studies have pointed out a degradation of water quality in the vicinity of slag dumps, due to high levels of Al, Cr, Mo, V, Ni, Pb, and/or Zn in slag's leachates (Bayless and Schulz, 2003, Roadcap et al., 2005, Mayes et al., 2008, Gomes et al., 2016). Thus, slag deposits and their leachates are requiring the development of ...
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slag reactivity, as briefly discussed in Section 2.1, a quantitative evaluation of slag and SCMs reactivity is still an important issue (see e.g. RILEM TC 267 TRM). As the chemical composition of the slag plays a key role in slag reactivity,12 a better understanding of the atomic structure of GGBS may help assess their hydration properties. 2.
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The role played by the slag in the oxygen converter steelmaking process is very important. Lime is critical to steelmaking. The science of how lime interact with the various components formed during …
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The steel slag powder with water or AC solution was thoroughly mixed for 2 min in a paste mixer (NJ-160), and the AC solution concentration and liquid-solid ratio were shown in Table 2. 12 g of wet steel slag powder was weighed and pressed into cylindrical steel slag samples with a diameter of 20 mm in a stainless steel mold at a load of 8 MPa ...
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The results indicate that the slag content and the water to binder ratio are the dominant factors affecting chloride penetration and corrosion initiation time of …
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A commercial ground granulated blast-furnace slag (GGBS), with the oxide composition shown in Table 1, was used.The slag has a specific gravity of 2.86 g/cm 3, Blaine fineness of 431 m 2 /kg and median particle diameter (d 50) of 11.9 μm.Technical-grade Na 2 CO 3 powder was used for preparing the activator by dissolving it in …
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Cation bridging effect played a key role in As adsorption on the BOF slag surface. ... and their relative contribution to overall As stabilization efficiency seems to be dictated by the amount of BOF slag and water content. Obviously, pH is also an important factor, but pH was maintained around 11 by the addition of BOF slag so that it was not ...
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Semantic Scholar extracted view of "Hierarchical porous composites derived from coal gasification fine slag for CO2 capture: Role of slag particles in the composites" by Zekai Miao et al.
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Common slag treatment process in Japan is shown in Figure 4.4.12 [81]. About 80% [79] of BF slag is quenched by water spray and the quenched BF slag sand produced is used mainly for cement, concrete and civil engineering resources. The rest is cooled by field air cooling and the slow cooled slag is used as a resource for road …
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To achieve "waste controlled by waste", a novel wet process using KMnO 4 /copper converter slag slurry for simultaneously removing SO 2 and NO x from acid-making tail gas was proposed. Through the solid-liquid separation for copper slag slurry, the liquid-phase part has a critical influence on removing NO x and SO 2.Also, the leached …
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At last, the furnace slag was heated to 1500 °C again and kept at a constant temperature for 0.5 h, then the furnace slag was taken out for water quenching, which was convenient for subsequent furnace slag structure analysis. A series of components are protected by argon, B is changed into nitrogen, C is changed into nitrogen and carbon.
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This paper aims to investigate the effect of delayed water curing on the mechanical and microstructural properties of fly ash-based geopolymer paste-blended with Ground Granulated Blast Furnace Slag (GGBS) with different rest periods.,The blended geopolymer paste was composed of GGBS (15 per cent of the total weight) and the base …
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1. Introduction. Blast furnace slag is a byproduct from pig iron production and it has been used as a mature addition in cement industry for several decades, especially in European and north American countries [1], [2], [3], [4].The chemical composition of slag varies depending on the origin significantly, such as where iron ore imported, fluxing …
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Steel slag was cooled by spraying water after it was discharged, and then stacked in a warehouse. The as-received steel slag was ground into powders with particle size smaller than 80 μm. ... [32] claimed that, in contrast to cement hydration, water only played the role in dissolving CO 2 in the process carbonation reaction, while did not ...
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