Abstract This paper reports the results of an initial attempt of using iron ore tailings (IOTs) to develop greener engineered cementitious composites (ECCs). ECC is a unique class of highperformance fiberreinforced cementitious composites featuring high tensile ductility and durability.
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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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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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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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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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Natural sand and iron ore tailings were used as aggregates. The natural sand was originally excavated from the lower reaches of Yangtze River and had an apparent density of g/cm tailings were obtained from the local iron and steel industry and had an apparent density of g/cm chemical composition of the tailings is shown in Table 1.
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Direct shear tests were carried out on reinforced iron tailings powder with polypropylene fiber with dosages of 0%, %, %, %, and 1%, respectively. ... Results show that iron ore ...
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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%, 25%, and 50% were made and tested. First, the basic properties of IOT used were measured to verify the theoretical feasibility. Second, the uniaxial compressive and tensile strengths, as well as the ...
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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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References (62) Figures (10) Abstract and Figures Currently, approximately billion tons per year of iron ore tailing wastes (IOT) are generated, mainly in Australia, Brazil, and China....
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The tailings seen here were pumped into the Gribbens Basin, next to the Empire and Tilden Iron Ore Mines in Negaunee, Michigan, USA. Once the materials are pumped into the pond, they are mixed with ... Iron Ore Mine Tailings Pond. from € THE OVERVIEW ART COLLECTION. Tailings are the waste and byproducts generated by mining operations ...
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For example, the content of SiO 2 in phosphate tailings is, in contrast to the in iron ore tailings. Even if there were all leadzinc tailings or iron ore tailings, the variation content of SiO 2 is in the leadzinc tailings or in the iron ore tailings. As a result, if tailings are only classified according to ...
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Iron ore tailings can be classified as high silicon, high aluminum, high calcium and magnesium, low silica and polymetallic type. And the highsilica iron ore tailings are widely distributed in China with large reserves. ... Earlyage hydration characteristics of composite binder containing iron tailing powder. Powder Technol. (2017) J. Liu et ...
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The concrete with 10% glass powder 30% iron ore tailings showed a higher strength compared to the conventional mix for 28 days. Concrete mix containing 10% GP and 30% IOT showed higher flexural ...
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Sakthivel et al in their work prepared magnetite powder using iron ore tailing. A fraction of the extracted FeCl 3 solution was changed into FeCl 2 via metallic iron formation using NaBH 4 as a reducing reagent. The magnetite particles synthesized in different ways showed varying degrees of magnetization behavior, credited to the change in ...
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A new approach for recovering iron from iron ore tailings using suspension magnetization roasting: A pilotscale study. Powder Technol. (2020) ... 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 ...
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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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Peng et al. [20] reported that the mechanical and physical properties of cement blended with 20% tailings were comparable to pure cement. Yao et al. [21] demonstrated that the iron ore tailings structurally degraded with the extension of grinding time and the activated iron ore tailings exhibited cementitious properties in the alkaline environment.
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When compared to reference concrete, the TS shown by the concrete with iron ore tailings aggregate improved by % with age . However, because of the greater fines content, the concrete with iron ore tailings aggregate would need more water to mix, which weakens the link between the aggregate and cement paste, and lowers the TS .
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Materials. Portland cement (P·O ), silica fume (SF), and iron tailing powder (ITP) was used in this study, as presented in Figure 1 ac. The physical properties of the cement (Table 1) were conforming to the Chinese National Standards GB [].The SF had moisture of %, a density of g/cm 3, and loss on ignition of %.The ITP was obtained from iron tailings after ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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