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The reaction of gehlenite, quartz, and periclase generates akermanite. 2 These two Ca-species are fluxing materials and can enhance ash deposition. 10,29. To better understand the slag formation in the furnace, Fig. 7 shows the mineral compositions of slags at different bed temperatures. At the bed temperatures of 820 °C and 870 °C, there is ...
The results showed that akermanite scaffolds possessed 63.5–90.3% of porosity, with a corresponding compressive strength between 1130 and 530 kPa. The weight loss of the scaffolds and ionic content of the Ringer's solution increased with the increase in soaking time, indicating the degradability of scaffolds.
amorphous) of blast furnace slag. The comparative analysis of adsorption and XRD data showed that the formation in slag of melililite crystal phases (gehlenite and åkermanite) and merwinite results in an almost double increase of Cu (II) adsorption, compared to amorphous slag. The addition of Al 2 O 3 alone and in combination with MgO leads to
Results from column experiments using modern slag (AMFeC) and legacy slag (ILSS5) from the Chicago-Gary area, Illinois and Indiana. (a) Percent phosphate (PO4) retained versus pore volume.
Viscous slag descended together with the reduced iron towards hearth. Micrographs of single phases will illustrate the whole process from the initial formation of iron sponge to the flow of slag and reduced iron into the zone of sintering or welding, respectively, in the reactor hearth. Further, slag phase compositions that are formed in
Feb 01, 2013· Akermanite is a common mineral found in steel slag from the production of carbon and stainless steel (Tossavainen et al., 2006, Engström et al., 2010). The crystal structure of akermanite is known to be tetragonal-scalenohedral (, 2012).
Mar 18, 2020· Boron oxide is frequently applied in modification of stainless steelmaking slag to mitigate the disintegration of slag. In this work, the effect of B2O3 on mineralogical phases and hexavalent chromium leaching behavior of synthetic CaO–SiO2–MgO–Al2O3–CrOx slag was investigated. Di-calcium silicate, merwinite, spinel, akermanite, and matrix phase were observed as main minerals in .
This paper presents a characterization analysis of alkali-activated steel slag. The effect ratio of steel slag and ferronickel slag which are the precursor materials on the compressive strength of the alkali-activated materials was investigated. The combination of sodium hydroxide solution of 15 moles concentration and sodium silicate was used as an alkaline activator.
M.L. Öveçoǧlu, Microstructural characterization and physical properties of a slag-based glass-ceramic crystallized at 950 and 1100 °c, Journal of the European Ceramic Society, 10.1016/S0955-2219(97)00094-0, 18, 2, (161-168), (1998).
ENERGY EXPLORATION & EXPLOITATION· Volume 32 · Number 3 · 2014 pp. 471–482 471 Characterization of slag from combustion of pulverized lignite with high calcium content in utility boiler P. Pintana1, N. Tippayawong1*, A. Nuntaphun2 and P. Thongchiew2 1Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, .
Slag – air VFT 25 1/s VFT 50 1/s 25 1/s 50 1/s XRD Solid Gehlenite Ca2Al2SiO7 Akermanite Ca2Mg1Si2O7 Results - XRD 8th International Freiberg Conference, 12 – 16 June 2016 14/21 • Viscosites diverge between 1370 and 1390°C and show a growing trend XRD confirm crystals at 1350 °C Gehlenite and small portions of akermanite are found
akermanite 3CaO·MgO·2SiO 2. The only crystalline compound in slow cooled slag which has cementitious properties is β-2CaO·SiO 2. Thus crystallized blast furnace slag has little or no value as a cementing component. Crushed BF slag for use as aggregate, ballast and light-weight building material has been an important industry for many years.
tion of the slag and solidification conditions in which it often gives rise to the formation of unbalanced states [3]. A ladle slag usually contains dicalcium silicate, merwinite, periklase, brownmillerite, akermanite, anor-thite, mellilite and other minerals, given in the Table 2. Table 2 Phase composition of ladle slags Slag Phase composition
2.2. Sample preparation and tests conducted TOP. Alkali-activated slag pastes were formulated with an activator dose of 5 g Na 2 O per 100 g slag, and a water to binder (free water + water in the activator)/(anhydrous activator + slag) ratio of 0.23. The paste was cast in cylindrical molds of 30 mm diameter ×60 mm height, sealed, and cured under ambient conditions (temperature 25 °C and ...
formation are necessary in order evaluate or predict the macroto -properties of BFS concrete based on micro-information. This paper summarizes the advances in our studies (Sagawa 2006a, 2006b, 2010, Ishida 2011, Luan 2012) on characterization and modeling of hydration and pore structure formation achieved in the last decade to
Impact of electric arc furnace slag on geopolymer composites exposed to sulphate solution Khater H M Associated professor at Housing and Building National Research Centre (HBNRC) 87 El-Tahreer St., Dokki, Giza, P.O. Box 12411 Cairo. * Corresponding Author: Hkhater4@yahoo Received: 06-07-2017 Revised: 08-08-2017 Accepted: 08-08-2017 Abstract.
ENERGY EXPLORATION & EXPLOITATION· Volume 32 · Number 3 · 2014 pp. 471–482 471 Characterization of slag from combustion of pulverized lignite with high calcium content in utility boiler P. Pintana1, N. Tippayawong1*, A. Nuntaphun2 and P. Thongchiew2 1Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Proceedings of the Fourth International Slag Valorisation Symposium Zero Waste 15-17 April 2015 Leuven, Belgium Editors Annelies Malfliet and Yiannis Pontikes
While the slag of the city carried the chemical signature of a typical Roman slag with elevated iron and silica values, the slag from Bey Dağlari showed an elevated titanium, vanadium, and zirconium content (Degryse et al. 2003a). At Dereköy, slag and furnace material were found in association with a spinel placer deposit.
Oct 13, 2015· The use of metallurgical slags in cement production depends on the phases present in such slags, which are affected by changes in slag composition as well as the cooling rates adopted during solidification. In this work, slags with distinct chemical compositions were melted and subjected to different cooling conditions. Slag samples were characterized by X-ray diffraction to identify and ...
Sep 01, 2017· The DTA is identified as a quick test to get a first impression of the crystallization behavior of a slag. A relationship between the forming of crystals inside a slag and its temperature of critical viscosity is confirmed in this study. Especially gehlenite and akermanite have a major impact on the rheological behavior of the analyzed slags.
like Akermanite Ca 2Mg(Si 2O 7), hydrotalcite Mg 6Al 2(CO 3)(OH) 16, calcite CaCO 3 and α-SiO 2 Quartz traces. The data shows the formation of C-S-H due to the alkaline activation of the slag in all the pastes mixtures. The slag in the pastes mixtures is the component capable to produce C-S-H gel because the glass waste has not the calcium content
Jun 29, 2020· The mixing method is the investigation of the characteristics of alkali-activated cement paste (AACP) with slag and silica fume (SF) of 1: 1. The basic mixing method is ASTM C305, which is defined as 1st-cycle. There are three factors considered in this experiment; (i) the addition of mixing time (2nd-cycle), (ii) the concentration of activator depending on the amount of mixing water, and (iii ...
Ironmaking slag has 40-45% CaO, 30-40% SiO 2, ... These processes result in the formation of monticellite, akermanite, melilite, tilleyite, spurrite, rankinite, merwinite and larnite. The ...
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