Reusing of iron ore tailings (IOT), particularly as recycled aggregate to prepare concrete, plays an important role in reducing dependence on natural resources and solving the problem of waste accumulation. In this paper, the effects of IOT as aggregate on the flowability, compressive strength of ultra-high performance geopolymer concrete (UHPGC) were studied, …
Single addition of IOTs as SCMs may worsen the mechanical properties of the concrete owing to the low reactivity of IOTs [12]. Therefore, the multi-SCM system including fly ash ... Activation of hydration properties of iron ore tailings and their application as supplementary cementitious materials in cement. Powder Technol., 360 (2020), pp. 863 ...
Direct Reduction processes for iron ore employing natural gas or hydrogen are becoming more important. Correspondingly, properties of outgoing products are of importance. Degradation of Direct Reduced Iron (DRI) feedstock greatly influences storage, handling, risk of reoxidation, and following melting operations. The focus of this work has been on the physical …
Macro-synthetic fiber-reinforced iron ore tailings (IOT) concrete is an environment-friendly building material featured by recycling IOT and improving performance of IOT concrete due to fiber incorporation. In this study, the mechanical properties of macro-synthetic fiber-reinforced concrete incorporating IOT were investigated.
Mechanical properties. The mechanical properties are important when considering handling of the iron ore pellets, when the pellets are indurated or loaded into the DRI unit or blast furnace. The important mechanical properties …
In selecting iron ore for iron and steel industries, some of the properties which need to be considered include (i) tumbler, abrasion and shatter indices, (ii) porosity, (iii) chemical …
Thereby, the exploration of the mechanical properties and durability indicators of cementitious composites with high additions of IOT will contribute to know the effects of the residue in this application. ... Experimental study on the properties of concrete mixed with iron ore tailings. Adv Mater Sci Eng (2016), p. 8606505, 10.1155/2016/8606505.
Iron Ore Tailings (IOT) are the waste slag resulted from iron ore mines. Large amount of Iron Ore Tailings (IOT) have been generating every year posing serious environmental problems, large production of cement everyday resulting the emission of CO2 and increase in the consumption of river sand for construction activities making the river beds over-exploited. These reasons …
However, for every ton of primary steel produced, twice the amount of CO 2 is emitted from the traditional iron-ore-based steelmaking process, ... The enhanced mechanical properties were primarily attributed to the higher volume fraction, larger carbon content, and smaller size of retained austenite that resulted from the refinement of PAGS ...
Iron ore tailings (IOT) are a type of mining solid waste and cause many environmental and safety problems. The aim of this paper was to investigate the effect of high-volume ultra-fine IOT on the mechanical properties and …
The flow-related mechanical properties of dusts from the de-dusting systems of several sinter plants were investigated. The mass median diameters of the dusts were in the range from approximately 3 to 100 µm. Also, the bulk density of the dusts varied in a wide range (approximately 400 to 2300 kg/m³ …
Regarding particle sizes, there are three types of IOT categories: iron tailings rock, produced by mechanical crushing of lowgrade ore and wall rock, with a granulometry above 4.75 mm and used as ...
For estimation of a Shatter Index, a dried lump iron ore sample (10 kg) of size −40 + 10 mm was dropped 4 times from a height of 2 m onto a cast iron floor (0.5 × 0.5 × 0.03 m). Thereafter, the iron ore was screened and the shatter index expressed as the wt% passing through a 5 mm sized screen (i.e., −5 mm fraction).
These microscopic transformations result in a significant decrease in the micro/macro-mechanical properties of iron ore (micro-indentation tests at millimetric scale, micro-compression triaxial tests at centimetric scale and macro-compression triaxial tests at decimetric scale). Multi-scale mechanical tests were performed in order to ...
Abstract. The goal of this experimental study is to produce fly ash (FA)-based coarse aggregates by adding iron ore tailings (IOT) to the FA-based precursor as an additional mix component. The involvement of different types of binders—influential factors of both pelletization and geopolymerization that govern the production of FA-based coarse …
In order to study the feasibility and sand substitution mechanism of cement mortar mixed with iron ore tailings (IOT), iron ore tailings cement mortars (referred to as IOTC) with IOT content of 0% ...
As industrial waste, iron ore tailings (IOTs) can be mixed with bentonite and bauxite and subsequently sintered into ceramsite. Under sintering at 1120 °C, ceramsite with 60- wt% IOTs, 30- wt% bentonite, and 10- wt% bauxite showed an optimal cylinder compressive strength of 10.53 MPa, bulk density of 917.84 kg m −3, 1-h water absorption of 9.9%, and …
Average impact energy versus volume content of iron ore tailings curves for PP-filled with 150 µm, 212 µm and 300 µm iron ore tailings particle sizes at volume content 0% to 30%.
The preface to research the result of the study on physical and mechanical properties of iron ore is in Haji gak iron ore mine in order to design the optimal blasting parameters during mining ...
The addition of iron ore tailing can improve the mechanical properties and conductivity. ... Nine mixtures were produced. The effects of CF and IOTs content on mechanical properties and electrical conductivity were investigated; Based on the digital image correlation (DIC) system, the stress sensing ability of the specimen was evaluated and the ...
The synergistic effects of CF and IOTs on the self-sensing properties of cement-based materials containing SF are illustrated in Fig. 14. Electrical conduction through iron particles is the ...
Request PDF | Mechanical properties of dust collected by dust separators in iron ore sinter plants | The flow-related mechanical properties of dusts from the de-dusting systems of several sinter ...
A.B. Kotta et al., Effect of molasses binder on the physical and mechanical properties of iron ore pellets addition of 1.0wt% bentonite further increased the DPCS values of the pellets to 45.3, 60.7, 65.3, 85.3, and 81.7 N/pellet. Bentonite acts as a cementing agent that helps increase bond strength and reduces gaps between particles after ...
Reducing porosity and increasing the binder content improved the overall mechanical behavior. N-A-S-H like gels were identified in IOTs-AAB mixtures. Finally, longer …
This study investigates the preparation process of micro-iron ore tailings (MIOT) and their impact on the hydration mechanism and microstructure of the cement-SS system. …
The mechanical properties of concrete with a tailing content of less than 50% are enhanced or comparable to those of the control specimen, as shown in Fig. 5, Fig. 6, Fig. 7. However, beyond a IOTs replacement ratio of 50%, the mechanical properties of the modified concretes are lower than those of the control specimen and show a decreasing trend.
In this work, a comparative study has been done to determine the effect of three different compositions of binders (bentonite and limestone (BLS), limestone and lime (LSL), and cement) and Blaine number on the properties of pellets prepared using the slime generated from the washing of Indian-origin iron ore. The compressive strength (C.S.) value of pellets made …
Iron ore tailings from iron ore mines pose environmental challenges. However, their reuse could provide significant environmental benefits. This study focused on producing clean concrete using iron ore tailings as crushed stone aggregate (IOTA) and calcium carbonate whiskers (CWs) as reinforcement. Five mixture groups were prepared: normal concrete (NAC) …
The paper investigates the effect of high-temperature roasting and cooling modes of roasted iron ore pellets on their strength and porosity. These characteristics depend on the initial iron ore ...
Particularly, iron ore tailings (IOT) as ordinary industrial solid waste in China is discharged and deposited. This review is a recapitulation of the material characteristics of IOT and its effects on the workability, mechanical properties, and durability of concrete.
A new analysis method based on serial sectioning and three-dimensional (3D) reconstruction was developed to characterize the mineral microstructure of iron ore sinter. Through the 3D reconstruction of two types of iron ore sinters, the morphology and distribution of minerals in three-dimensional space were analyzed, and the volume fraction of minerals in a …
A number of physical properties of the ceramsites are determined; these include the cylinder compressive strength, structure, morphology, and iron distribution for different …
The laboratory analysis reveals for physical properties of collected ore samples, maximum value of specific gravity 4.5, water absorption 2.10%, volume gravity 5.69gr/m3, and porosity 6.54% and...
Molasses was used as an alternative binder to the bentonite binder. The change in moisture absorption by pellets prepared with different iron ores and different molasses contents were investigated. Iron ore properties exerted the major effect on pellet behavior and final pellet quality. The absorbed moisture content of pellets prepared without binder, bentonite-added …
Thus, the performance of ITZ plays an important role in the mechanical properties of concrete [7, 8]. In order to improve the mechanical performance, we add iron ore tailings (IOTs) to RAC. IOTs are the waste residue after separating the iron concentrate, which are one of the major industrial wastes [9].
This work aims to evaluate the influence of the incorporation of iron ore tailings (IOTs) on the mechanical, thermal, and morphological properties of polypropylene, IOT, and maleic anhydride grafted polypropylene (MAPP) composites. IOTs come in the form of coarse particulates (sand) and fine particulates (iron sludge). Composites were processed using a twin …
Zeng [ 11] and Bastosh [ 12] et al. investigated the mechanical properties of iron-ore tailing and found that iron-ore tailing can be used as subgrade road filler after chemical …
Iron ore pellets not only have excellent metallurgical and mechanical properties but are also essential raw materials for improving iron and steel smelting in the context of the increasing global ...
The initial microcracks of the recycled aggregate concrete (RAC) usually first appear in the interfacial transition zone (ITZ) during the destructive process. Thus, the performance of ITZ plays an important role in the mechanical properties of concrete [7,8]. In order to improve the mechanical performance, we add iron ore tailings (IOTs) to RAC.