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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% ...
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As a solid waste, iron tailings urgently need to be addressed to prevent further environmental and social issues. This study attempted to replace natural limestone filler (LSF) with 20%, 40%, 60% and 80% iron tailing filler (ITF) in an asphalt mixture to improve its microwave self-healing properties. For this purpose, the microscopic appearance ...
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Huang et al., (2013) also attempt to use Iron ore tailings to develop greener engineered cementious composites (ECCs). He found that, with cement content 117.2 - 350.2 kg/m3 exhibit a tensile ductility of 2.3 - 3.3%, tensile strength of 5.1 - 6 MPa and compressive strength of 46 – 57 MPa at 28 days. ...
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The possibility of using iron-ore enrichment tailings in the production of ceramic articles is investigated. The compositions and properties of ceramic bodies and the process parameters for manufacturing articles are presented. To increase product quality nepheline concentrate is used as an alkali-containing additive.
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The present study examines the mechanical behavior of compacted iron ore tailings (IOT)-binder blends for dry stacking purposes, highlighting the effect of the cement type on the behavior of the tailings: two commercially available types of binders, portland pozzolan cement (PPC) and high early-strength portland cement type III (PC III); and ...
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Full iron tailings concrete can effectively use iron tailings as the raw materials of concrete. This paper used iron tailings powder, iron tailings sand and iron tailing gravel to replace fly ash, river sand, and ordinary gravel as concrete admixtures, fine and coarse aggregates, respectively. The orthogonal experimental method was used to optimize the mix proportion of C40 strength …
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Fig. 2 illustrates the iron ore beneficiation process, particularly magnetic separation, resulting in the generation of inevitable tailings. Due to the characteristics of iron ores and …
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2.1.4 Fine Aggregate Natural river sand with maximum size of 4.75mm was used in this study. The specific gravity was found to be 2.64. 2.1.5 Iron Ore Tailings Iron ore tailings are the materials left over after the beneficiation process of separating the valuable fraction from the worthless fraction of an iron ore.
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The incorporation of iron tailings did not affect the impermeability of concrete. However, the impermeability grade of concrete with the incorporation of iron tailings is not high, and its impermeability can only be used as an adjunct. In engineering application, the concrete must be added to concrete admixtures to improve impermeability. 4.2.
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Thus, given the high iron contents observed in the tailings from iron mines, it is natural to assume that these tailings are excellent catalysts for Fenton or Fenton-like processes. However, Fe 2+ is the most effective oxidation state for the activation of the oxidation agent, while the most common oxidation state in iron tailings is Fe 3+ .
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This study evaluated the use of iron ore tailings (IOT) as a source of silica (SiO2) to produce an alternative form of sodium silicate (SS) for use as an activator in one-part geopolymer binders ...
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The volumes of tailings grow in the same proportion as the mining production (Kinnunen et al., 2017), leading to problems of environmental liabilities.In Brazil, the disposal of iron ore tailings (IOTs) in mining companies is often carried out in dams (IBRAM, 2020).However, many of these dams began to face structural risks due to the increase in the …
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The comprehensive utilization of iron tailing slag has become a necessary means to maximize the comprehensive utilization of solid waste. Iron tailing slag is a potentially hydraulic material [5]. Aged iron tailing slag has certain strength, durability, stability and thermal properties [6]. And it can be divided into coarse iron tailing slag (4 ...
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Novel methods are explored to improve sulfate resistance for cement pastes by using grounded iron ore tailings (GIOTs), BaCO 3 and both of them. Experiments were conducted on a plain cement paste and six blended cement pastes with different contents of GIOTs and BaCO 3.All the pastes were exposed to two kinds of external sulfate attacks (a 5 …
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Iron tailings are various as they can be divided into three categories: (1) silt content is less than 40%; (2) silt content is more than 40%, while clay content is less than 15%; and (3) clay content is more than 15% and less than 30%. Correspondingly, three equations are proposed to calculate the disturbed and iron undisturbed tailings ...
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The structures with the addition of 10% and 20% of iron ore tailings had about the same results as the structures of soil–cement with no addition of iron ore tailings. Moreover, the use of iron ore tailings in pavements layers also contributes by creating a new disposal method to the tailings, reducing the environmental impact related to the ...
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Taking asphalt pavement maintenance as an example, iron tailings are applied to the maintenance of the pavement. If the amount of 200 g/m 2 of iron tailings is used, 48 million tons of iron tailings can be eliminated in the country. The price of limestone is 40–45 yuan/ton. However, iron tailings are only 10–13 yuan/ton.
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2.1.5 Iron Ore Tailings Iron ore tailings are the materials left over after the beneficiation process of separating the valuable fraction from the worthless fraction of an iron ore. The various processes of beneficiation are crushing, screening, grinding, washing, jigging, cycloning, using magnetic separator etc.
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Using iron tailings powder as an mineral admixture, and iron tailings gravel and sand as coarse and fine aggregates, respectively, the flexural behavior of full iron tailings concrete (FITC) …
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The samples of iron mining tailings were characterized and later underwent flash calcination at a temperature of 770˚C, the characterization of the samples demonstrated that: • The chemical analyses show that the sum of the amounts of Al2O3, SiO2 and Fe2O3 is similar in the tailings and kaolins, which indicates the potential for use of the ...
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The Minas Gerais region is recognized as one of Brazil's largest iron ore extraction areas, the world's second-largest producer. During mineral extraction, tons of tailings are generated and ...
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eme of iron tailings improvement was obtained, which provided a theoretical basis for the ecologic al restoration of iron tailings. 1 Experiments and Methods 1.1 Raw Materials The gradation and particle composition of iron tailings are important indicators to comprehen sively reflect the characteristics of iron tailings.
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The characterization of iron ore tailings differs greatly on the ore type, beneficiation process, and clay mineralogy. Therefore, a comprehensive analysis and testing is required before its application in structural fills. Iron ore tailings are finer material consisting of different chemical …
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Abstract. Iron ore tailings (IOT) are generated in large-scale around the world and are stored in its slurry form generating risks of dam failure. The stabilization of this tailings by …
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The iron tailings sand used in the test was selected from the reservoir area of the Lizhu iron tailings factory in Shaoxing, Zhejiang Province. The particle size distribution is within 2 mm. The gradation curve is shown in Fig. 1. Polypropylene fibers are 6 mm in length and 48 μm in diameter dispersed bundle monofilaments produced by Shaoxing ...
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As a result, the potential use of tailings and the "transition" from the tailings to a useful source is a turning point for the mining industry, but it is becoming an important issue in the world economy. Today, ... Iron tailings/fly ash-based geopolymer: High thermal conductivities; low porosity and microcracks: Binder materials:
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Iron tailings (IT) is a kind of solid waste, which is usually divided into iron tailings powder (ITP) and iron tailings sand (ITS). It has been reported that IT has potentials to be used in ultra high performance concrete (UHPC). However, the recovery rate of IT is relatively low, and rare research mentioned the co-utilization of ITP and ITS to ...
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The use of seawater and iron tailings result in conservation of natural resources and sustainability in construction. However, as permeability is an important factor affecting durability of mortar, it is necessary to study the mechanism of chloride penetration resistance in seawater iron tailings mortar, which forms the subject of this study. ...
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The iron tailings-based mortar with HNTs-BF attained a 28-day flexural strength of 10.56 MPa, which is 70.6% higher than the control iron tailings mortar without fiber, and 18.1% higher than the iron tailings mortar containing original basalt fiber. Importantly, this study provides a novel and stable solution for surface decoration of basalt ...
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attempt to use Iron ore tailings to develop greener engineered cementious composites (ECCs). He found that, with cement content 117.2 - 350.2 kg/m3 exhibit a tensile ductility of 2.3 - 3.3%, tensile strength of 5.1 - 6 MPa and compressive strength of 46 –57 MPa at 28 days. Mangalpady (2012) mentioned in his paper that the
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The literature shows the potential use of iron ore tailings as a replacement of natural fine aggregates. As natural sand reserves are depleting day by day, there is a need for substitution for ...
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