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 ...
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 ...
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.
ECC Using Iron Ore Tailings Powder as Cement . Replacement" Journal Of Materials In Civil . Engineering 25:923931(2013) Citations (3) References (13)
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.
1 Introduction. Iron Ore Tailings (IOTs) refer to the solid waste associated with the process of iron concentrate extraction from iron ore and are an important source of environmental pollution [1,2].Approximately 5 billion tons of IOTs are currently present in China, and more than 600 million tons are produced every year.
Iron ore tailings (IOTs) are a form of solid waste produced during the beneficiation process of iron ore concentrate. In this paper, iron recovery from IOTs was studied at different points during a process involving preconcentration followed by direct reduction and magnetic separation.
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 ...
(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.
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.
Iron ore tailings, as a solid waste discharged after beneficiation, may contain different heavy metal elements and toxic substances. It is subject to leaching by surface water and groundwater when it is applied to the pavements. ... Magnetite powder and kaolinite derived from waste iron ore tailings for environmental applications. Powder ...
The article conducts a study on the iron tailings sand concrete's fracture behaviour based on the doubleK criterion. Five sets of standard threepoint bending beam specimens of concrete with 0% ...
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 ...
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% ...
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.
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.
Concrete Mix Proportion. In order to explore the action law of metal tailings powder on the sulfate resistance of concrete, the compound admixture of metal tailings powder and slag powder is adopted. The proportion of metal tailings powder in the compound admixture is 0%, 30%, 50%, 70%, and . Two kinds of common concrete, C30 and C50, are ...
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%.
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.
3. Test to Find the Optimum Mixing Amount of Iron Ore Tailings Workability of Samples with Different Mixing Amount of Iron Ore Tailings. Let the bulk density of C30 concrete be 2400 kg/m 3, and let the mass ratio between iron ore tailings and natural sand be α.Here, the concrete without iron ore tailings was set as reference.
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.
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.
Natural or modified iron ore tailings in a CH 4 reducing atmosphere at 600 °C or impregnated with residues of polyethylene terephthalate (PET) powder (from bottle recycling) and treated under an inert atmosphere of N 2 at 600 °C were used as heterogeneous catalysts for the Fenton reaction.
The iron ore tailing sample was a granular highsilicon solid waste obtained after the beneficiation process of iron ore following the steps of stage grindinggravity separationmagnetic separationanion reverse flotation. The sample had a size distribution ranging from to µm. ... Powder Technol., 379 (2021), pp. 466477 ...
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