Compressive strength and composite pore structure parameters of
The compressive strength of concrete is closely related to its pore structure. Xu et al. [8] investigated recycled aggregate concrete containing iron tailings The addition of iron ore tailings enhances the compressive strength and impermeability of UHPC mortars due to the filling effect of IOT and the pozzolanic Effects of iron ore tailings on the compressive strength
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Compressive strength and composite pore structure parameters of
The compressive strength of concrete is closely related to its pore structure. Xu et al. [8] investigated recycled aggregate concrete containing iron tailings Uniaxial compressive strength (UCS) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. Tests are typically performed on intact lengths Uniaxial Compressive Strength an overview
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(PDF) Effect of Gangue Distribution on Compressive Strength of
Effect of Gangue Distribution on Compressive Strength of Iron Ore Granules ISIJ International License CC BY-NC-ND 4.0 Authors: Tatsuya Kon Ginichiro The compressive strength of ultra-high performance concrete (UHPC) at 28 days can be greater than 150 MPa (greater than 100 MPa, in China) [1]. The Effects of iron ore tailings on the compressive strength and
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DEM study of the mechanical strength of iron ore compacts
Compaction is a method to compress iron ore fines into a denser compact using pressure ( Kim et al., 2000, Pizette et al., 2010 ). Water is added as a binding Autoclaved aerated concrete (AAC), a lightweight building material, is widely used in buildings due to its good insulation properties, high heat resistance, low The Composition and Performance of Iron Ore Tailings in Steel
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Effects of iron ore tailings on the compressive strength and
Effects of iron ore tailings on the compressive strength and permeability of ultra-high performance concrete Semantic Scholar. Semantic Scholar Moreover, inducement mechanism of compressive strength of iron ore granule was investigated by adding clay or reagent hematite. The results obtained are follows: (1)(PDF) Effect of Gangue Distribution on Compressive Strength of Iron Ore
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Iron Ore Pelletizing Process: An Overview IntechOpen
The iron ore production has significantly expanded in recent years, owing to increasing steel demands in developing countries. However, the content of iron in ore deposits has deteriorated and low Uniaxial compressive strength (UCS) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. Tests are typically performed on intact lengths of NQ, HQ, or PQ diamond drill core and record the maximum axial load sustained at the point of failure.Mineralogical, chemical, and physical characteristics of iron ore
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Compressive strength and composite pore structure parameters of iron
Shettima A U et al. [35] studied to assess the feasibility of replacing natural sand in concrete with iron tailings sand and suggested that a reasonable mixture of iron tailings particles and natural sand with fine aggregates is beneficial for the increase in compressive strength, while the presence of high concentration of iron may have a Furthermore, a maximum compressive strength of 7.7 MPa was achieved for blocks after 28 days of air U. M., & Kavitha, S. (2019). A probable mathematical relationship between (Si/Al) ratio and (Ca/Si) ratio on the compressive strength of an iron ore tailings sample arising out of geopolymeric reactions. Journal of Mining and MetallurgyCompressed unfired blocks made with iron ore tailings and slag
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Compressive strength of iron-ore pellets Springer
CAST IRON COMPRESSIVE STRENGTH OF IRON-ORE PELLETS I. A. Kopyrin, I. F. Graur, F. A. Ryabokon', Yu. M. Borts, V. D. Urin, and A. A. Yurin UDC 622.788.36 Compressive strength (OST 14-3-72) is regarded as one of the principal criteria of suitability of roasted iron- ore pellets for metallurgical processing.The results of the compressive strength are presented in Table 4 while tensile strength is plotted in Fig. 7. The compressive strength test was carried out at the curing ages of 7, 14 and 28 days while tensile strength was tested at ages of 7 and 28 days curing. All the tests were conducted in accordance to EN 12390 [25].Evaluation of iron ore tailings as replacement for fine aggregate in
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Experimental Study on the Properties of Concrete Mixed with Iron Ore
Similarly, with the increase in the proportion of the iron ore tailings, the compressive strength of the tailing mixes at 7 d increased and then decreased subsequently after the first reduction. However, the tailing mixes’ compressive strengths of 25%, 35%, and 45% at 7 d were all less than that of the control mix because the surface Presence of silica along with oxides of iron, alumina, and other trace minerals indicates their potential as aggregate for mortar and concrete [56, 57]. 100% replacement of fine aggregate with iron ore tailings drastically reduced the workability and compressive strength of concrete,whereas the mechanical behaviour of tailing mix A Critical Review on Potential Use of Iron Ore Tailings as
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Investigations on Compressive Strength and Microstructure of
Pellets are one of the principal raw materials of blast furnaces 1,2,3 and have the advantages of high total iron content, less gangue content, high compressive strength and uniform particle size. 4 Compared with sinter production, pellets have lower energy consumption and produce less pollution. When 100% pellets are used for Request PDF Effect of high basicity on compressive strength and microstructure of iron ore pellets containing TiO 2 A laboratory study is carried out to characterize the effect of basicityEffect of high basicity on compressive strength and
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Strength of iron-ore agglomerates during reduction
INTRODUCTION The term "reduction strength" means the mechanical strength of iron-ore agglomerates during reduction. The iron-oxide material in the agglomerates consists of iron ore -- hematite and/or magnetite -- which in various forms is reduced to iron. The reduction usually takes place in a blast furnace, yielding molten pig It was observed that the compressive strength for all the curing ages were higher in iron ore tailings aggregates concrete than in the normal concrete as the control mix. At age of 28 days, the compressive strength of the tailings aggregates concrete was 36.95 MPa while that of the control mix was 33.12 MPa, which shows an improvement of 11.56% of Utilisation of iron ore tailings as aggregates in concrete
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An approach to calibration of BPM bonding parameters for iron ore
The actual iron ore has different shapes and sizes, according to the standard of the test for determing the uniaxial compressive strength of rock, the actual iron ore needs to be processed into a cylindrical shape, as shown in Fig. 2 (a).Therefore, the model used for DEM simulation should also be cylindrical, as shown in Fig. 2 (c) and Ismail and Al-Hashmi conducted a sequence of experimental tests on the mechanical behavior of concrete made from abandoned iron ore tailings in Iraq, and the findings showed that it performed better than regular concrete and displayed greater compressive strength and flexural strength. Iron ore tailing (IOT) application as fine Concrete Made with Iron Ore Tailings as a Fine Aggregate: A Step
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Microstructure and phase analysis of indurated iron ore pellets
The iron ore is first crushed into a powder, mixed with additives and a binder, and rolled into green pellets (10–15 mm in diameter) that are sintered to pellets in a furnace during pelletizing of iron ore [10,11]. The green pellets are thermally treated in the grate and rotary kiln to increase the mechanical strength [12–14].In this paper, the strong organic binder, namely SL, was used to enhance the compressive strength of the limonite pellet, which is required to reduce VOC emission during the iron-making process. The limonite pellets' pellet size variation and compressive strength prepared with SL-based binders were studied at a temperature range from 900 Effect of CaO and MgO additives on the compressive strength
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Study of Organic and Inorganic Binders on Strength of Iron
Bentonite is a predominant binder used in iron ore pelletization. However, the presence of a high content of silica and alumina in bentonite is considered undesirable for ironmaking operations. The objective of this study was to identify the alternatives of bentonite for iron ore pelletization. To achieve this goal, different types of organic and Materials. The iron ore tailings (IOT) were obtained from Samarco's iron ore concentrator (Brazil). The metakaolin (MK) was obtained from Jundiaí, São Paulo, Brazil. The alkaline activator, the sodium hydroxide flakes, NaOH and sodium silicate Na 2 SiO 3 were commercial products obtained with purity greater than 97%. 2.2.Reuse of iron ore tailings for production of metakaolin-based
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Kinetics of iron ore pellets reduced by H ScienceDirect
Iron ore pellets used in this investigation were kindly supplied by Shouqin metal materials company. Its chemical composition and physical characteristics were shown in Table 1 and Table 2, respectively. The particle size is in the range of 10–12.5 mm, and the average of compressive strength is 3120 NP −1.
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