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Online quality control of aggregates based on the measurement of magnetic susceptibility
Published in Vladimir Litvinenko, Topical Issues of Rational Use of Natural Resources 2019, 2019
C. Weigel, K.C. Vogler, A. Ploch, H. Tudeshki
Determination of the magnetic susceptibility on hand piece and rock powder. Determination of the loss of ignition (LOI), i.e. the difference in weight after heating to 850°C for several hours, for the determination of the proportion of crystallization water, carbon oxide and sulphur oxide.Determination of the ethylene glycol index and methylene blue method 9 to determine the content of clay minerals in rock.Long-term weathering test in which rocks are exposed to atmospheric weather conditions for more than one year.Determination of rock petrography and geochemistry by microscopy on polished thin sections and multi-element analysis.
A comprehensive study on the performance of alkali activated fly ash/GGBFS geopolymer concrete pavement
Published in Road Materials and Pavement Design, 2022
Aishwarya Badkul, Rakesh Paswan, S. K. Singh, J. P. Tegar
Class F fly ash conforming to IS: 3812 (2013) obtained from national thermal power plant (NTPC), Dadri, India was used. The specific gravity of fly ash was 2.17 and Blain’s surface area was 349 m2/kg. Ground granulated blast furnace slag (GGBFS) conforming to IS: 12089 (1987) and obtained from M/s. Jindal steel Raigarh, India was used. It was creamy in colour with a specific gravity of 2.9 and Blaine’s surface area was 513 m2/kg. The loss on ignition of fly ash and GGBFS was 1% and 3%, respectively. The ordinary Portland cement of grade 43 conforming to IS: 269 (2015) was used for manufacturing control concrete. The specific gravity of cement was 3.13 and Blaine’s surface area was 324 m2/kg. The particle size distribution (PSD) of fly ash and GGBFS was determined using Horiba LA-950V2 laser particle size analyser. The PSD curves of fly ash and GGBFS are presented in Figure 2. The mean size of fly ash and GGBFS particles was 46 and 48 µm and about 68% and 72% of the particles were smaller than 45 µm, respectively. Figure 3 shows the scanning electron microscope (SEM) graphs of fly ash and GGBFS particles. More fly ash particles were spherical, whereas the GGBFS particles were angular and irregular.
Preparation and characterisation of environmental-friendly ceramsites from iron ore tailings and sludge
Published in International Journal of Sustainable Engineering, 2021
Z. Wang, H. J. Chen, L. Z. Pei, X. Y. Guo, C. G. Fan
Iron ore tailings and sludge were used as the raw materials to prepare tailing ceramsites. Iron ore tailings were obtained from Ma’anshan Gushan Mining Co., Ltd of P. R. China. Sludge was obtained from Ma’anshan sewage treatment company. The main composition and content of the raw materials is shown in Table 1. The loss on ignition (LOI) value of iron ore tailings and sludge is 10.08 wt.% and 26.28 wt.%, respectively. The particle size distribution of iron ore tailings and sludge is listed in Table 2. The maximum size of the 90 wt.% iron ore tailing and 90 wt.% sludge powder are 35.6 μm and 278.4 μm, respectively. The mass percentage of the iron ore tailing and sludge powder with the size of less than 100 μm is 99.9% and 54.8%, respectively.
Toward the influence of iron oxide morphology on the grinding and filtration processes and on the cold crushing strength (CCS) of heat-treated iron ore pellets
Published in Mineral Processing and Extractive Metallurgy Review, 2020
Leonardo Martins Graça, Gilberto Álvares da Silva, Marcos Meyer Machado, Josué Bortolini Sette da Silva, Carlos Fernando Ávila, Ricardo Scholz, Leonardo Lagoeiro
All samples were characterized in terms of their chemical composition and as well as for their physical properties. The loss on ignition was determined by thermogravimetric method using a Quimis muffle furnace running at 1000°C. The determination of Fe content was carried out by wet chemistry, in which Fe is titrated with potassium dichromate solution 0.1 N, according to the ISO 2597–2:2015 standard. X-ray Fluorescence analyses were used to obtain the contents of SiO2, Al2O3, P2O5, MnO, CaO, MgO, and TiO2on a Simultix 14 of Rigaku Corporation. The sample fractionation was prepared by sieving into four size fractions: [+ 1] mm, [−1 + 0.106] mm, [−0.106 + 0.045] mm, and [−0.045] mm, and the specific surface area were determined by Fisher Scientific Sub–sieve sizer model 95.