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The purpose of this study was to investigate the reuse of desulfurization slag in cement clinker production and its influence on the formation of clinker phases. The desulfurization slag that mainly …
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The air cooled slag crushes to angular, roughly cubical particles with pitted surfaces. Very good bonding of the slag is achieved either with the hydraulic cements or with the bituminous binder materials. ... Either the individual components (the granulated BF slag and the Portland cement clinker) can be ground separately and subsequently ...
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Cement and Concrete Research 29 (1999) 303–307 Grindability of cement clinker from raw mix containing metallic particles Joseph O. Odigure * Chemical Engineering Department, Federal University of Technology, …
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The optimum mix proportion of solid materials in clinkerless AAC contained 30%–40% steel slag, 45%–55% blastfurnace slag, 10% clinker and 5% gypsum; while …
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Effect of the mass ratio of bentonite to carbide slag on the particles. Bentonite and carbide slag were mixed at mass ratios of 9:1–1:9, and 5 wt% Na 2 CO 3 was added. Then, the mixture was ...
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This is due to the fact that these heavy metal compounds can form a crystalline film on the surface of clinker particles, wrapping the clinker particles and hindering hydration. For example ... On the one hand, the rapid cooling of EFS by water causes the slag particles to exhibit more micro cracks, thus, accelerating the dissolution …
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In summary, clinkers prepared with steel slag as ferric raw material have a similar or even better performance than the ordinary clinker. 0.15 mm is the maximum particle size of steel slag that can be fully involved in the clinker sintering reaction. Particles larger than 0.15 mm are considered coarse particles in this study.
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Fly ash particles from Polish power stations: a) siliceous fly ash b) calcium fly ash c) ... [82], with the joint grinding of Portland clinker and GBFS causing an uneven share of slag and clinker in individual grain fractions [83]. Slag, as a harder component, dominates in coarser grain fractions, while clinker in the finer ones. ...
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The paper presents experimental results regarding the synthesis of Portland clinker starting from raw mixes based on two types of clayey precursors, i.e., clay and marl (the most common types of raw materials used in the cement industry), with and without glass waste content. The soda-lime glass waste addition (5.36–5.59 wt %), used to …
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The clinker is milled to get cement where also milling additives (supplementary cementitious materials) like slag, fly ash or gypsum might be added. Concrete is a synthetic rock which is produced by mixing minimum three components: cement, water and aggregate. ... These larger slag particles are not available for …
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Compared with Portland cement clinker, slag has less CaO and Fe 2 O 3 but a significantly higher amount of SiO 2, Al 2 O 3, and MgO. ... The presence of these non-reacted slag particles in the alkaline solution environment of cement contributes to the ability of these materials to self-heal cracks .
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In summary, clinkers prepared with steel slag as ferric raw material have a similar or even better performance than the ordinary clinker. 0.15 mm is the maximum …
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Both discussed components are obtained, similarly to Portland clinker, in a high-temperature process and commonly used as main constituents of cement and/or as concrete components. The degree of granulated blast-furnace slag utilization in the composition of cement and concrete is over 90%, whereas the fly ash is about 30% [2].
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The interface area between reconstructed steel slag and clinker forms high-iron phase clinker ... Clinker particles were encapsulated with epoxy resin, ground and polished with a polishing machine, and eroded in 1% NH 4 Cl solution. After dried for 3–5 s, the sample was observed by a NIKON LV100POL microscope. The chemical bonding …
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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 slag (without grinding). The results show that after high temperature treatment, the inert components and tough phases of steel slag such as iron phase, …
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Abstract. Ground granulated blast furnace slag (GGBS) is a by-product from the blast-furnaces used to make iron. Blast-furnaces are fed with controlled mixture of iron-ore, coke and limestone, and operated at a temperature of about 1,500°C. When iron-ore, coke and limestone melt in the blast furnace, two products are produced—molten iron ...
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Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates (3CaO.SiO 2 and 2CaO.SiO 2), the remainder consisting of aluminium and iron containing clinker phases and other compounds.The ratio of CaO to SiO 2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% …
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Fine particles in steel slag powders accounted for 52% of the total volume and had a count mode diameter of 25.53 μm, which was 67% of that of overburning MgO powders. The results in Fig. 3 indicated that adding a proper amount of steel slag powders can improve the particle size distribution of alkaline components (M + S). 2.1.3.
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After carbonation, unreacted clinker particles, crystalline CaCO 3, and highly polymerized silica formed a dense microstructure, ... Calcium carbide slag (CCS) is a solid waste from the hydrolysis of calcium carbide to obtain acetylene gas, with Ca(OH) 2 as the main component. Acetylene gas can be further used to prepare polyvinyl chloride(PVC).
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The clinker particle size decreases from 35.22 μm to 12.09 μm with prolonged milling time in the beginning, leading to an increase in surface area from 1.3595 m 2 /g to 2.7941 m 2 /g, while the initial and final setting time decreased from 260 min to 180 min and from 465 min to 335 min, respectively. The reduction of clinker particle size by ...
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The addition of both limestone and slag (PLC-S) were found to further broaden the PSD of OPC component and limestone component with the mean size of particles increased in the following order (limestone < slag < OPC). Among the tested samples, the packing density of OPC was the lowest while the packing density of PLC-S was found to …
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Potential phase composition (by bogue formula), moduli values and LSF (lime saturation factor) of clinker samples are given in Table 3.LSF and C 3 S content were highest in CL-E, while CL-W has the lowest LSF and C 3 S content. C 2 S content was found to be highest in CL-W while lowest in CL-E. The high content of C 3 A and C 4 AF …
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As shown in Fig. 1, the microstructure like rough textures and irregularly shaped fine particles can be observed on the surface of both BOF and EAF steel slag, Which may be caused by the unbalanced thermodynamic conditions during the formation of slag.The BOF slag tends to have a slightly round and elliptical structure, while the EAF …
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Arsenic sludge and gypsum sludge samples were air-dried and then sieved to obtain particles less than 2 mm in size. Smelting slag was produced from Pb/Zn smelting of high-temperature liquid slag discharged from a blast furnace, and subsequently quenched with water. Download : Download high-res image (517KB) Download : Download full-size …
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The basic clinker fusion is formed at 1327 °C. These differences in A-F formation are clear with the increase of slag concentration in raw mixes. The gehlenite and mayenite is observed at 1200 °C in clay-containing mixes along with belite phase, which is not observed in slag-containing samples.
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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 …
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The analysis and observations in this article offer a new resource for SCM development, describe a basis for using metallurgical waste slag as a cementitious …
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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 …
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slag particles were found to be about 20 µm or 200 µm or more in size. The particles about 20 µm in size had been hydrated almost completely, whereas the particles …
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Hence, using 220 ton /day slag for clinker manufacturing, SO 2 emission reduction was 0.05*220*330 or 3630 kg (or 11 kg/day) SO 2 emission was reduced per year. ... The dust and fine particles are collected in the bag house, bag filters and ESP and reused in the production process. However, the particulate matter emitted from the stack …
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