— As iron tailings contain heavy metal which is a potential damage to natural environment [35], leaching toxicity tests of IT-contained UHPC mixtures was tested according to the Chinese national standard GB 5086.2-1997. The leaching ability of P3T0 with the maximum ITP content and P3T4 with the maximum ITP and ITS content was …
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— The dolomite rock powder and iron tailings powder composing a large number of active substances could be advantageous to the cement-based materials. In this study, the electrical resistivity...
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— In the preparation of building materials, iron tailings can be used as fine aggregate in the concrete system or as cementitious material after activation. Under different roasting processes, it can produce …
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— To investigate the application of iron tailings in cement-based materials as fine aggregate and mineral admixture, six iron tailings sands were selected from different places of origin, and the methods of acid and alkali activation were adopted to increase the activity of tailings powder. The strength of mortar was evaluated and the composition …
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— Iron tailings continue to generate and accumulate in large quantities, leading to problems such as large land area, environmental pollution and high ecological risks. Therefore, there is an urgent need to develop economic and effective technologies for the large-scale utilization of subway tailings. In this study, aiming at the problems of low ...
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— Two kinds of composite mineral admixtures were prepared by grinding iron tailings powder and silicon powder in the ratios of 3∶2 and 4∶1, respectively to substitute cement for the preparation of mortar and concrete samples. The basic properties of iron tailings-silica fume composite mineral admixture mortar and concrete have been studied …
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— Fig 1 Uses and form of dolomite in iron and steel industry. Processing of dolomite. Dolomite after its mining has to undergo several processing before it can be used in various processes. The basic processes in the production of dolomite are (i) quarrying of raw dolomite, (ii) preparing mined dolomite for its use by crushing and sizing, (iii ...
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— The chemical and physical properties of iron ore tailings are comprehensively examined in this review, and various beneficiation and metallurgical recovery techniques …
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— The microstructures and element contents of iron tailings powder, cement, and nano-clay are determined by SEM and EDS according to the testing methods in [22]. Fig. 2 a is the SEM spectrum of iron tailings powder, showing the random and disorder configuration of iron tailing particles and many pores with different radii (>1 μm) between …
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— Dolomite rock powder (the waste stone residue in the production of machine-made sand and stone processing) and iron tailings powder formed by mineral processing industry are solid wastes, ... How to treat the iron tailings of mining solid waste with high value is an urgent problem on a global scale.
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DOI: 10.1016/j.conbuildmat.2020.118108 Corpus ID: 213558392; Properties of high-volume iron tailing powder concrete under different curing conditions @article{Han2020PropertiesOH, title={Properties of high-volume iron tailing powder concrete under different curing conditions}, author={Fanghui Han and Ao Luo and …
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— The main gangue species was fluorite with small amounts of dolomite and amphibole. Due to the weak magnetism of hematite and rare earth minerals, magnetic separation has low efficiency. However, magnetization roasting-magnetic separation is an effective method to recover hematite. ... 16 copper slag, 17 iron tailings, 18 vanadium …
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— Echeverri evaluated the use of iron ore tailings from the Monjolo pile in the Quadrilátero Ferrífero as a filter in land works, mainly for dams, replacing the natural sand found in the rivers and dunes. The author found that the properties of resistance and durability of this waste can be considered as a good material to be used in filters of ...
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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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— Mining is an important industry, accounting for 6.9% of global GDP. However, global development promotes accelerated demand, resulting in the accumulation of hazardous waste in land, sea, and air environments. It reached 7 billion tonnes of mine tailings generated yearly worldwide, and 19 billion solid tailings will be accumulated by …
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— 2.1. Geology and Study Area. As shown in Figure Figure1 1, the Yeshan iron tailings pond is located 40 km north of the Nanjing region of Jiangsu Province, China.The Nanjing region has a subtropical monsoon climate with four distinct seasons. The average temperatures in January and July were 2.2 and 28.6 °C, respectively. 23 The tailings …
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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 the conditions during beneficiation, it is inevitable that approximately 2.5–3 tons of IOTs are generated for every 1 ton of iron ore concentrate produced [7].In 2019, the …
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— Iron tailings can be used as fine aggregate in concrete, but this kind of concrete has no coarse aggregate, resulting in low strength. Additionally, iron tailings contain some heavy metals, which ...
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— The main objec0ve of this paper is to evaluate the use of iron ore tailings (IOT) from flota0on process (which resembles fine sand) in the composi0on of asphalt mixtures. ... Calcite, dolomite ...
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— The dolomite rock powder and iron tailings powder composing a large number of active substances could be advantageous to the cement-based materials. In this study, the electrical resistivity of ...
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— Ecological engineering of tailings has been advocated to change tailings' mineralogy, improve physicochemical properties, and accelerate soil formation (i.e. pedogenic processes), allowing the re-colonisation of microbial communities and pioneer plant species (Huang et al. 2012).These early settlers, in turn, act as powerful biological …
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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, 2.5–3 tons of tailings will be produced for each ton of iron concentrate powder screened on average.
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1. Introduction. Iron ore tailings (IOTs) are solid wastes produced in the process of iron ore beneficiation. Pollutants from tailings wastes sometimes cause serious environmental problems and damage, not only to animals and plants but also to human health (Nishijima and Rocha, 2020; Wang et al., 2023; Wilson and Pyatt, 2006).In China, the accumulated …
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— Iron tailings is one of the main solid waste produced in the process of iron ore development, and is also an important secondary resource. ... et al. Experimental study on soil conditioner preparation by using iron tailings and by-product mica powder and dolomite[J]. Metal Mine, 2018(6): 192-196. Google Scholar
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— The mine tailings are inhomogeneous and have a complex mineral, aggregate, and chemical composition [59, [109], [110], [111]].Furthermore, although having relatively low quantities of valuable components, mine tailings contain hazardous and toxic compounds connected with waste products or mining activities [82, 84, [112], [113], …
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— In recent years, with the rapid development of the iron and steel industry, the amount of industrial waste gases, wastewater, and waste residues has increased every year [[1], [2], [3], [4]].Among these, the amount of iron ore tailings discharged from concentrators is enormous, and more than 10 billion tons of iron ore tailings and barren …
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— In order to comprehensively utilize iron ore tailings (IOTs), the possibility of using IOTs as raw materials for the preparation of cementitious composites (IOTCCs) was investigated, and IOTCC was further applied to mine interface pollution control. The mechanical properties, hydration products, wind erosion resistance, and freeze–thaw …
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— For magnetite, the strain contribution to the line broadening is very small and negligible. The variations of crystallite sizes of quartz, hematite, magnetite, and dolomite from the milled samples of iron ore tailings as a function of the mean particle size are shown in Fig. 6. The experimental data are well approximated by a logarithmic function.
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— It can be seen that the iron tailings and clay were mainly composed of SiO 2 and Al 2 O 3, and the content of Fe 2 O 3 in the iron tailings was also high. The dolomite was mainly composed of CaO and …
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Dolomite rock powder (the waste stone residue in the production of machine-made sand and stone processing) and iron tailings powder formed by mineral processing industry are solid wastes, which occupy land resources, pollute the environment and release toxic substances without reasonable processing. The dolomite rock powder and iron tailings …
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