Semantic Scholar extracted view of "Preparation of UHPC with cement replaced by richsilicon iron ore tailing powder" by Lini Yang. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 215,130,968 papers from all fields of science. Search ...
The mineralogical phase and the morphology of iron ore tailing powder were investigated by XRD and SEM techniques, and the results are shown in Fig. 1. In Fig. 1 a, the main identified diffraction peaks of iron ore tailings can be assigned to quartz, kaolinite, augite and anorthite, which corresponds to the marked particles respectively in Fig. 1 b
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 ...
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 ...
The two iron ore tailings (ST = sandy tailing, MT = mud tailing), with different iron content (wt.%) were initially dried at 120 ºC for 24 h. The iron tailings were direct reduced by heating 500 mg at 10 ºC min 1 up to 500 ºC in a tubular furnace and holding for 3 h with pure H 2 (50 mL min 1, Air Products, Mogi das CruzesSP, Brazil).
Flexural behavior evaluation and energy dissipation mechanisms of modified iron tailings powder incorporating cement and fibers subjected to freezethaw cycles. J. Clean. Prod. (2022) ... The use of iron ore tailings obtained from the Germano dam in the production of a sustainable concrete. Journal of Cleaner Production, Volume 278, 2021 ...
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.
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% ...
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 ...
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.
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%.
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. ...
Iron tailing powder (ITP) is considered to have the potential to replace cement to manufacture ultrahighperformance concrete (UHPC). However, the performance of UHPC with the addition of ITP after exposure to high temperatures is more complex.
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 ...
The iron ore tailings aggregates concrete exhibited a good mechanical strength and even in the case of compressive strength, there was an improvement of % over conventional aggregates concrete. The indirect tensile strength did not improve against the control mix due high content of fines in the tailings aggregates but showed % ...
Powder Technology Volume 361, 1 February 2020, Pages 571580 A new approach for recovering iron from iron ore tailings using suspension magnetization roasting: A pilotscale study Yongsheng Sun a b, Xiaolong Zhang a b c, Yuexin Han a b, Yanjun Li a b Add to Mendeley https://// Get rights and content •
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 ...
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 ...
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.
The results showed that the proper addition of iron tailing powder is beneficial to the working performance of concrete and can effectively reduce the timeloss of concrete fluidity. When the content of iron tailings powder in the composite admixture is 50%, the 1080d long age strength of C30 and C50 concrete can reach and MPa.
ECC Using Iron Ore Tailings Powder as Cement . Replacement" Journal Of Materials In Civil . Engineering 25:923931(2013) Citations (3) References (13)
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 ...
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.
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.
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.
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.
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.
Iron ore tailings have been widely studied in recent years for blending in cementitious materials, ... Experimental investigations on the mechanical behavior of iron tailings powder with compound admixture of cement and nanoclay. Construct Build Mater, 254 (2020), /
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 ...
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