1. Introduction. The continuous development of mineral resources forms many tailings, which is one of the rich solid waste resources. The accumulation of tailings pollutes the environment and poses a threat to the safety of surrounding people and buildings [1,2].Iron tailings (IOTs) account for the most significant proportion of the total tailings' generation in China: about 520 million tons ...
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Small iron tailing powder particles are beneficial to the properties of precast concrete, but large iron tailing powder particles weakly bond with surrounding hydrates. ... Innovative methodology for comprehensive utilization of iron ore tailings part 2: the residues after iron recovery from iron ore tailings to prepare cementitious material. J ...
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This effect is more significant under the condition of low water binder ratio and slag powder, and increases with the increase of age. For example, when the water binder ratio is and the ratio of ITP to slag powder is 5:5, the 1080d strength of iron tailings powder concrete is MPa higher than that of LP concrete. (2) According
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Iron ore tailing is a major solid waste requiring advanced recycling methods because ore tailing powder is polluting air and water resources. For instance, about 300 million tons of tailings are disposed yearly in 1229 iron ore tailings dams in the Hebei province in China. Iron ore tailings can be recycled as functional materials because these tailings are similar to natural silicate minerals ...
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Iron ore tailings (IOTs) are byproducts of the iron mining industry that have gained significant attention in recent years due to their potential for comprehensive utilization. ... Aluminum powder is the most commonly used ing agent in the production of AAC, and lime hydration provides the necessary alkaline environment for the ing ...
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chemical mineral composition of iron tailings, the comprehensive utilization status of iron tailings is analyzed. Some existing problems are put forward and relevant Suggestions are given. 1. Introduction Iron tailings are the waste residue discharged from iron ore after they are selected by the ore dressing process.
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The limited cementitious activity of steel slag (SS) powder restricts its largescale utilization as a replacement material for Portland cement and even more so for inert iron ore tailings (IOT). The microIOT (MIOT) were utilized as additives to improve the compressive strength and hydration degree of a binary system containing SS and PC.
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(ii) iron tailings sand, used as fine aggregate, particle size ranging from mm to mm, is produced by grinding and filtrating of iron mineral [29] (iii) iron tailing powder as concrete mineral admixture, of particle size < mm. With the development of iron ore beneficiation, the size of IOT particle is getting smaller and smaller.
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DOI: / Corpus ID: ; Properties of highvolume iron tailing powder concrete under different curing conditions article{Han2020PropertiesOH, title={Properties of highvolume iron tailing powder concrete under different curing conditions}, author={Fanghui Han and Ao Luo and Juanhong Liu and Zengqi Zhang}, journal={Construction and Building Materials}, year ...
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Based on the problems of high carbon emission and high cost of traditional mining methods and filling materials, the tailings powder modified Coal Ganguebased Cementitious Backfill Material (CGCBM) was used for paste filling mining. In this study, the samples were prepared with different tailings powder content and different curing ages.
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The world produced an estimated billion tonnes of iron ore during 2015 (Footnote 1 US Geological Survey, Mineral Commodity Summaries, January 2016).The fact that generation of tailing is about 1015% of ore [] indicates that more than billion tonnes of tailings are generated annually leading to increasing amount of are known for leaching toxic substances ...
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The development of iron and steel industry requires the exploitation of a large number of iron ore resources. While producing iron concentrate powder on demand, a large number of eliminated tailings will be produced [1, 2].According to statistics, tons of tailings will be produced for each ton of iron concentrate powder screened on average.
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The newly developed versions of ECC in this paper, with a cement content of, exhibit a tensile ductility of %, tensile strength of, and compressive strength of 4657MPa at ...
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Abstract. Iron ore tailing (IOT) is the wastes generated during the salutariness process of iron ore concentration. These wastes are abundant in quantity, which can be utilized in many ways. In this manuscript, utilization potential of IOT as a resource and its adaptation in the replacement of different industrial raw materials have been discussed.
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High‑silicon iron ore tailings (IOTs) as mineral solid wastes derived from the processing and utilization of iron ore, which would threaten human health and the ecological environment if handled improperly. Coincidently, it consists of abundant quartz gangue. In this study, we proposed a superconducting high gradient magnetic separation (SHGMS) coupling with acid leaching technology to ...
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In this study, iron ore tailings (IOTs) are used as aggregates to prepare ironoretailingengineered cementitious composites (IOTECCs) to achieve clean production. Some mechanical indexes, such as compressive strength (fcu), fourpoint flexural strength (ff), axial compressive strength (fc), deformation properties, flexural toughness, and stressstrain behavior, are studied.
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Iron ore tailings (IOTs) are the indusus solid waste discharged by concentrating mills after processing iron ores and selecting "valuable components" ( Yao et al., 2020 ). In China, 600 million tons of IOTs are discharged every year and the IOTs deposition has reached 5 billion tons.
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Iron ore tailings (IOT) are discharged as waste after the beneficiation process to concentrate iron ore, which has triggered a series of environmental problems. ... [23] found that IOT powder decreased the compressive strength but that the strength was similar to that of plain cement paste with increasing curing age. Han et al. ...
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The main chemical component of highsilicon iron tailings (HSITs) is SiO2; HSITs also include some oxides such as Al2O3 and CaO. Mechanical activation can reduce the particle size of HSITs and enhance their pozzolanic activity such that they can be used as a type of mineral admixture for cementbased materials (CBMs). This study aims to investigate the mechanical activation (ultrafine grinding ...
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The cementitious activity of iron tailings powder (ITP) as a concrete admixture is investigated and optimized in this study. When the specific surface area (SSA) of ITP is in the range of 450 550 m 2 /kg, the activity is larger than that of fly ash, and when SSA is 469 m 2 /kg, the activity reaches its largest value of %. The content of ITP should not exceed 30%.
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During the reduction roasting stage, the hematite within iron ore powder was almost entirely transformed into magnetite at a reduction temperature of 520 °C using a gas combination of 45 % H 2 15 % CO 40 % N 2, which significantly enhanced the magnetism of the particles. At this time, iron minerals could be effectively recovered by a ...
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Iron ore tailings not only cover huge land and pollute environment, but also give rise to security risks. In November 2007, 13 people died in the accident caused by iron ore tailings dambreak in Anshan of Liaoning province, China. ... High titanium heavy slag powder (HSP) is a typical waste with vast reserves but lacks effective disposal. ...
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The two main methods of recycling iron from iron ore tailings are magnetizing roasting and direct reduction. Magnetizing roasting uses temperatures between 700 and 900 °C ... the point where the crystallized magnetite and quartz are fine enough that the quartz is left behind when the resultant powder is passed under a magnetic separator.
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The influences of iron tailing powder (ITP) ... However, to recycle more iron from ore and tailings, the ultrafine grinding used in the beneficiation process today induces the particle size of iron tailings to finer and finer [25], which implies a potential for filler replacement in asphalt mixtures. Only a few researchers have explored this field.
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Particularly, iron ore tailings (IOT) as ordinary industrial solid waste in China is discharged and deposited. ... and YB/T [28], there are three types of IOT: iron tailings powder, iron tailings super fine sand, iron tailings fine sand. However, in most previous researches, IOT mainly covers three categories: (i) iron tailings rock ...
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Introduction Iron ore tailing (IOT) is an industrial solid waste produced after beneficiation process of iron ores. It is a kind of fast accumulated waste due to the increasing demand for iron, steel and the relevant industries worldwide [1].
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It has been reported that iron tailing powder (ITP) has the potential to partially replace cement to prepare ultrahighperformance concrete (UHPC). However, the reactivity of ITP particles in concrete largely depends on the curing method. This study investigates the effects of curing conditions on the mechanical and microstructural properties of UHPC containing ITP. To achieve this objective ...
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Abstract India is well enriched with abundant resources of magnetite and hematite iron ore. Mining activities are tremendously increasing to cater the demand of market, which in turn is responsible for huge generation of mining waste.
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